CN103709687A - Composition containing PBAT (poly(butylene adipate-co-terephthalate)), preparation method thereof and PBAT full biodegradable mulching film - Google Patents
Composition containing PBAT (poly(butylene adipate-co-terephthalate)), preparation method thereof and PBAT full biodegradable mulching film Download PDFInfo
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Abstract
The invention discloses a composition containing PBAT (poly(butylene adipate-co-terephthalate)), a preparation method thereof and a PBAT full biodegradable mulching film. The composition contains the following components in percentage by weight: 55-90wt% of PBAT, 5-40wt% of modified talcum powder, 0.1-1wt% of antioxidant, 0.1-1wt% of ultraviolet absorption agent, 0.05-1wt% of light stabilizer, 0.1-1wt% of anti-sticking agent, 0.1-1wt% of lubricant and 0.05-1wt% of dispersing agent. According to the invention, the modified high-transmittancy talcum powder and silicon dioxide and/or SR100 from Ciba Company are added in the PBAT, so that the antiblocking property of the PBAT mulching film prepared from the PBAT composition is enhanced.
Description
Technical field
The present invention relates to polymeric material field, particularly, relate to composition and method of making the same and the PBAT complete biodegradable mulch film of a kind of PBAT of containing.
Background technology
Environmental protection has become the focus noun that the universe pays close attention to, at present every country is all in the environmentfriendly products of active development Sustainable development, in film industry, full-biodegradable film is just paid attention to by western developed country as far back as eighties of last century, and is expected to solve current white pollution problems.
China is large agricultural country, and the annual mulch film amount of using is more than 1,000,000 tons, and membrane covering area is more than 200,000,000 mu.Traditional ground membrane material is the petroleum base films such as PE, PVC, after being used, this mulch film reclaims difficulty, discard and in soil, more than a century be all difficult to decompose, caused crop production reduction, the series of problems such as cannot be cultivated in soil, have a strong impact on the Sustainable development of China's agricultural, and may change the water circulation system in region, affected the ecosystem in whole region.
PBAT is tetramethylene adipate and mutual-phenenyl two acid bromide two alcohol ester's multipolymer, has good biological degradability, and has the characteristic of PBA and PBT concurrently, and existing good ductility and elongation at break, also have good thermotolerance and impact property.But the melting index of pure PBAT is low, processing characteristics is not high, and during blown film, opening is poor, and price is higher, is unfavorable for promoting the use of on a large scale.How reducing the price of PBAT mulch film and the opening of raising PBAT film has become the key problem in technology of degradable PBAT mulch film.
Summary of the invention
The object of the invention is, for the low defect of opening of the mulch film that the composition production that contains PBAT that provided by prior art makes is provided, provides composition and method of making the same and the high PBAT complete biodegradable mulch film of opening of a kind of PBAT of containing.
The opening of mulch film refers to the smooth performance of mulch film, the inventor finds by research, under the condition of tensile strength that guarantees PBAT mulch film, the opening of PBAT mulch film depends on dynamic friction factor and the static friction factor of PBAT mulch film, therefore the formula of the composition that the present invention contains PBAT by change, improve under the prerequisite of tensile property of the composition contain PBAT, thereby the frictional coefficient that reduces PBAT mulch film improves the opening of PBAT mulch film.
To achieve these goals, the invention provides the composition of a kind of PBAT of containing, wherein, described composition contains PBAT, modified talc powder, oxidation inhibitor, uv-absorbing agent, photostabilizer, caking inhibiter, lubricant and dispersion agent; The gross weight of described composition of take is benchmark, the content of described PBAT is 55-90 % by weight, the content of described modified talc powder is 5-40 % by weight, the content of described oxidation inhibitor is 0.1-1 % by weight, the content of described uv-absorbing agent is 0.1-1 % by weight, the content of described photostabilizer is 0.05-1 % by weight, and the content of described caking inhibiter is 0.1-1 % by weight, and the content of described lubricant is that the content of 0.1-1 % by weight and described dispersion agent is 0.05-1 % by weight.
The present invention also provides the preparation method of the composition of a kind of PBAT of containing, wherein, the method comprises PBAT, modified talc powder, oxidation inhibitor, uv-absorbing agent, photostabilizer, caking inhibiter, lubricant and dispersant, then by mixture extruding pelletization; The gross weight of described composition of take is benchmark, the consumption of described PBAT is 55-90 % by weight, the consumption of described modified talc powder is 5-40 % by weight, the consumption of described oxidation inhibitor is 0.1-1 % by weight, the consumption of described uv-absorbing agent is 0.1-1 % by weight, the consumption of described photostabilizer is 0.05-1 % by weight, and the consumption of described caking inhibiter is 0.1-1 % by weight, and the consumption of described lubricant is that the consumption of 0.1-1 % by weight and described dispersion agent is 0.05-1 % by weight.
The present invention also provides a kind of PBAT complete biodegradable mulch film, wherein, and the composition that described mulch film contains the above-mentioned PBAT of containing or the composition that contains PBAT preparing by aforesaid method.
Compare with prior art PBAT composition, the present invention by adding modified talc powder to improve the tensile strength of PBAT composition in PBAT, and can keep the original elongation at break of PBAT, add caking inhibiter simultaneously, can significantly reduce the static and dynamic friction coefficient of PBAT film, improve the opening of the PBAT mulch film being made by the composition that contains PBAT.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The invention provides the composition of a kind of PBAT of containing, wherein, described composition can contain PBAT, modified talc powder, oxidation inhibitor, uv-absorbing agent, photostabilizer, caking inhibiter, lubricant and dispersion agent; The gross weight of described composition of take is benchmark, the content of described PBAT is 55-90 % by weight, the content of described modified talc powder is 5-40 % by weight, the content of described oxidation inhibitor is 0.1-1 % by weight, the content of described uv-absorbing agent is 0.1-1 % by weight, the content of described photostabilizer is 0.05-1 % by weight, and the content of described caking inhibiter is 0.1-1 % by weight, and the content of described lubricant is that the content of 0.1-1 % by weight and described dispersion agent is 0.05-1 % by weight.
Preferably, described caking inhibiter can be the caking inhibiter that the trade mark of silicon-dioxide and/or vapour Bagong department is SR100, and described silicon-dioxide is preferably the micron silica that particle diameter is 1-5um; Described lubricant can be Zinic stearas and/or calcium stearate; The density of described PBAT is 1.24-1.27g/cm
3, at 190 ℃, melting index is 2-4g/10min, and fusing point is not less than 115 ℃, and weight-average molecular weight is 50,000-80,000.
According to the present invention, described in contain PBAT composition in the high talcum powder thoroughly of modification for improving the tensile strength of PBAT composition, and can keep the original elongation at break of PBAT.Add caking inhibiter, can significantly reduce the static and dynamic friction coefficient of PBAT film, particularly the trade mark of silicon-dioxide and/or vapour Bagong department is that SR100 can significantly reduce the static and dynamic friction coefficient of PBAT film as caking inhibiter, has further improved the opening of the PBAT mulch film being made by the composition that contains PBAT.
According to the present invention, described oxidation inhibitor, ultraviolet-resistant absorbent, photostabilizer and lubricant are all originally to receive known reagent, for improving the compatibility between PBAT composition each component of stability, mobility and composition under light, heat condition, preferably, described dispersion agent is polyethylene wax and/or ethylene bis stearamide, described oxidation inhibitor is four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and/or three [2,4-di-tert-butyl-phenyl] phosphorous acid ester; Described uv-absorbing agent is Octabenzone; Described photostabilizer is succinic acid and 4-hydroxyl-2, the polymkeric substance of 2,6,6-tetramethyl--1-piperidine alcohols.
According to the present invention, described modified talc powder is by under agitation, and talcum powder is mixed and made with properties-correcting agent, and the temperature of described mixing is preferably 15-35 ℃.Therefore, preferably, described modified talc powder contains talcum powder and properties-correcting agent, preferably, described talcous particle diameter is 2000-3000 order, and described properties-correcting agent is one or more in stearic acid, sodium stearate and Zinic stearas preferably, more preferably, the talcum powder of 100 weight parts of take is benchmark, and the content of described properties-correcting agent is 0.1-1 weight part.
The present invention also provides the preparation method of the composition of a kind of PBAT of containing, wherein, the method comprises PBAT, modified talc powder, oxidation inhibitor, uv-absorbing agent, photostabilizer, caking inhibiter, lubricant and dispersant, then by mixture extruding pelletization; The gross weight of the composition that the consumption of each component makes to obtain is benchmark, the content of described PBAT is 55-90 % by weight, the content of described modified talc powder is 5-40 % by weight, the content of described oxidation inhibitor is 0.1-1 % by weight, the content of described uv-absorbing agent is 0.1-1 % by weight, the content of described photostabilizer is 0.05-1 % by weight, and the content of described caking inhibiter is 0.1-1 % by weight, and the content of described lubricant is that the content of 0.1-1 % by weight and described dispersion agent is 0.05-1 % by weight.
Preferably, above-mentioned modified talc powder is by talcum powder and properties-correcting agent are mixed and made, described talcous particle diameter is 2000-3000 order, preferably, the diameter of described talcous particle is 2500 orders, and preferably, described properties-correcting agent is selected from one or more in stearic acid, sodium stearate and Zinic stearas, the talcum powder of 100 weight parts of take is benchmark, and the consumption of described properties-correcting agent is 0.1-1 weight part.
Preferably, the density of described PBAT is 1.24-1.27g/cm
3, at 190 ℃, melting index is 2-4g/10min, and fusing point is not less than 115 ℃, and weight-average molecular weight is 50,000-80,000.
Described oxidation inhibitor is four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and/or three [2,4-di-tert-butyl-phenyl] phosphorous acid ester; Described uv-absorbing agent is Octabenzone; Described photostabilizer is succinic acid and 4-hydroxyl-2, the polymkeric substance of 2,6,6-tetramethyl--1-piperidine alcohols, and preferably, described photostabilizer is the photostabilizer 622 of Nanjing Hua Liming Chemical Co., Ltd.; Described caking inhibiter is the caking inhibiter that the trade mark of silicon-dioxide and/or vapour Bagong department is SR100; Described lubricant is Zinic stearas and/or calcium stearate; Described dispersion agent is polyethylene wax and/or ethylene bis stearamide, and the trade mark of described polyethylene wax is CH2A, and polyethylene wax, ethylene bis stearamide can adopt the product of Shanghai Hua Yi auxiliary chemicals company limited.
In aforesaid method, the order by merging of material both can be mixed together, can mix step by step again, preferably, first PBAT and described modified talc powder are mixed, again the mixture obtaining is mixed with described oxidation inhibitor, described uv-absorbing agent, described photostabilizer, described caking inhibiter, described lubricant and described dispersion agent, more random hybrid mode, it is more superior that this hybrid mode finally makes the various physicalies of PBAT composition.
Extruding pelletization in aforesaid method can adopt the extruding pelletization mode of this area routine, preferably, described extruding pelletization carries out in twin-screw extrusion forming machine, the length-to-diameter ratio of described twin screw extruder is 40:1-50:1, the condition optimization of extruding pelletization comprises: extrusion temperature is 125-135 ℃, screw speed is 100-300r/min, preferably, to the resin particle of producing, also carry out cooling, not only can be water-cooled but also can be air-cooled, further preferably, the described water-cooled that is cooled to, water-cooled is more conducive to the formation of crystal, in Cooling Process, water temperature is 10-30 ℃, the PBAT composition grain character making under above-mentioned preferred extruding pelletization condition is more stable.
According to the present invention, before described method also can be included in each material is mixed, PBAT and modified talc powder are carried out to drying treatment, preferably, talcum powder is dried at 80-120 ℃ to 1-2h and PBAT is dried at 50-80 ℃ to 1-2h, this is to prevent that moisture from producing bubble to composition and causing degradation in granulation process.
The present invention also provides the composition of the above-mentioned PBAT of containing and the composition that contains PBAT that aforesaid method prepares to prepare PBAT complete biodegradable mulch film for blowing.The described method that the composition of the PBAT of containing of the present invention is carried out to Blown Film can adopt the method for well known to a person skilled in the art to carry out.Preferably, the condition of described Blown Film comprises: blow temperatures is 120-140 ℃, and preferably, described Blown Film is used single screw extrusion machine to coordinate corresponding blowing head to carry out Blown Film, and the length-to-diameter ratio of single screw extrusion machine is 20:1-30:1.
Below by specific embodiment, the present invention will be further described:
The PBAT(tetramethylene adipate using in following examples and mutual-phenenyl two acid bromide two alcohol ester's multipolymer) weight-average molecular weight 50,000-80,000 (product of Zhejiang Xin Fu pharmaceutcal corporation, Ltd); The trade mark of the polyethylene of dispersing agent wax using is CH2A, and polyethylene of dispersing agent wax, ethylene bis stearamide are all the products of Shanghai Hua Yi auxiliary chemicals company limited; Oxidation inhibitor is four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester (product of Ke Bangte Chemical Co., Ltd.) and/or three [2,4-di-tert-butyl-phenyl] phosphorous acid esters (product of Zibo Qi Xiang petrochemical complex Group Co.,Ltd); Uv-absorbing agent is Octabenzone (product of Shanghai Zi Yi chemical reagent work); Photostabilizer is the photostabilizer 622 of Nanjing Hua Liming Chemical Co., Ltd.; Caking inhibiter is the caking inhibiter that the trade mark of silicon-dioxide and/or vapour Bagong department is SR100; Lubricant is Zinic stearas and/or calcium stearate; Modified talc powder is by 2500 object talcum powder of 100 weight parts and the stearic acid of 0.1 weight part, at 20 ℃, to stir 10min to make; The tailor-made product of the sub-chemical industry outfit company limited of twin screw extruder Nanjing section using, length-to-diameter ratio is 40:1, and extrusion temperature is 125-135 ℃, and screw speed is 300r/min; The single screw extrusion machine model of using is Zhongshan city Ke Zhida Machinery Co., Ltd. tailor-made product, and length-to-diameter ratio is 30:1, and extrusion temperature is 120-140 ℃; Stretching experiment (tensile strength, elongation at break) adopts the test method that state's label is GB13022-91, and frictional experiment adopts the test method that state's label is GB10006-1988; High-speed mixer is the product of Zhangjagang City Xin Da plastics machinery Manufacturing Co., Ltd, and model is SHR-10A.
Embodiment 1
The concrete operating process of the present embodiment is as follows:
The PBAT of 57 weight parts, the modified talc powder of 40 weight parts is dry 2h at 100 ℃;
Dried PBAT and modified talc powder are mixed in and in high-speed mixer, mix 10min, then add four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.4 weight part, Octabenzone 0.2 weight part, photostabilizer 0.4 weight part, silicon-dioxide 0.6 weight part, Zinic stearas 0.9 weight part, polyethylene wax 0.5 weight part, fully mix;
The material being mixed after even is put into melt blending in twin screw extruder, tie rod, pelletizing, obtain granular hybrid resin;
To the hybrid particle resin of granulation gained in previous step being dried at 60 ℃ to 4h;
Hybrid resin after drying treatment is put into single screw extrusion machine, and the PBAT Biodegradable mulch A1 that thickness is 0.01mm is produced in blowing, then A1 is carried out to tensile property and frictional behaviour and detects, and detects data and sees the following form 1.
Embodiment 2
The concrete operating process of the present embodiment is as follows:
By PBAT62 weight part, modified talc powder 35 weight parts are dry 2h at 100 ℃;
Dried PBAT and modified talc powder are mixed in and in high-speed mixer, mix 10min, then add four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.1 weight part, Octabenzone 0.5 weight part, photostabilizer 0.8 weight part, the SR1000.1 weight part of vapour Bagong department, Zinic stearas 0.9 weight part, polyethylene wax 0.6 weight part, fully mix;
The material being mixed after even is put into melt blending in twin screw extruder, tie rod, pelletizing, obtain granular hybrid resin;
To the hybrid particle resin of granulation gained in previous step being dried at 60 ℃ to 4h;
Hybrid resin after drying treatment is put into single screw extrusion machine, and PBAT Biodegradable mulch A2 is produced in blowing, then A2 is carried out to tensile property and frictional behaviour and detects, and detects data and sees the following form 1.
Embodiment 3
The concrete operating process of the present embodiment is as follows:
By PBAT68 weight part, modified talc powder 29 weight parts are dry 2h at 100 ℃;
Dried PBAT and modified talc powder are mixed in and in high-speed mixer, mix 10min, then add four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.9 weight part, Octabenzone 0.2 weight part, photostabilizer 0.1 weight part, the SR1000.8 weight part of vapour Bagong department, Zinic stearas 0.9 weight part, dispersion agent 0.1 weight part, fully mix;
The material being mixed after even is put into melt blending in twin screw extruder, tie rod, pelletizing, obtain granular hybrid resin;
To the hybrid particle resin of granulation gained in previous step being dried at 60 ℃ to 4h;
Hybrid resin after drying treatment is put into single screw extrusion machine, and the PBAT Biodegradable mulch A3 that thickness is 0.01mm is produced in blowing, then A3 is carried out to tensile property and frictional behaviour and detects, and detects data and sees the following form 1.
Embodiment 4
The concrete operating process of the present embodiment is as follows:
By PBAT72 weight part, modified talc powder 25 weight parts, dry 2h at 100 ℃;
Dried PBAT and modified talc powder are mixed in and in high-speed mixer, mix 10min, then add four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.4 weight part, Octabenzone 0.9 weight part, photostabilizer 0.4 weight part, the SR1000.2 weight part of vapour Bagong department, Zinic stearas 0.2 weight part, polyethylene wax 0.9 weight part, fully mix;
The material being mixed after even is put into melt blending in twin screw extruder, tie rod, pelletizing, obtain granular hybrid resin;
To the hybrid particle resin of granulation gained in previous step being dried at 60 ℃ to 4h;
Hybrid resin after drying treatment is put into single screw extrusion machine, and the PBAT Biodegradable mulch A4 that thickness is 0.01mm is produced in blowing, then A4 is carried out to tensile property and frictional behaviour and detects, and detects data and sees the following form 1.
Embodiment 5
The concrete operating process of the present embodiment is as follows:
Take PBAT78 weight part, modified talc powder 19 weight parts, and PBAT and modified talc powder are dried to 2h at 100 ℃;
Dried PBAT and modified talc powder are mixed in and in high-speed mixer, mix 10min, then add four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.4 weight part, Octabenzone 0.4 weight part, photostabilizer 0.6 weight part, the SR1000.6 weight part of vapour Bagong department, calcium stearate 0.5 weight part, polyethylene wax 0.5 weight part, fully mix;
The material being mixed after even is put into melt blending in twin screw extruder, tie rod, pelletizing, obtain granular hybrid resin;
To the hybrid particle resin of granulation gained in previous step being dried at 60 ℃ to 4h;
Hybrid resin after drying treatment is put into single screw extrusion machine, and the PBAT Biodegradable mulch A5 that thickness is 0.01mm is produced in blowing, then A5 is carried out to tensile property and frictional behaviour and detects, and detects data and sees the following form 1.
Embodiment 6
The concrete operating process of the present embodiment is as follows:
Take PBAT88 weight part, modified talc powder 9 weight parts, and PBAT and modified talc powder are dried to 2h at 100 ℃;
Dried PBAT and modified talc powder are mixed in and in high-speed mixer, mix 10min, then add three [2,4-di-tert-butyl-phenyl] phosphorous acid ester 0.4 weight part, Octabenzone 0.2 weight part, 0.4 part of photostabilizer, the SR1000.6 weight part of vapour Bagong department, calcium stearate 0.9 weight part, ethylene bis stearamide 0.5 weight part, fully mix;
The material being mixed after even is put into melt blending in twin screw extruder, tie rod, pelletizing, obtain granular hybrid resin;
To the hybrid particle resin of granulation gained in previous step being dried at 60 ℃ to 4h;
Hybrid resin after drying treatment is put into single screw extrusion machine, and the PBAT Biodegradable mulch A6 that thickness is 0.01mm is produced in blowing, then A6 is carried out to tensile property and frictional behaviour and detects, and detects data and sees the following form 1.
Embodiment 7
The present embodiment and embodiment 6 differences are, in this enforcement, each material is to join together in high mixer, and it is A7 that the present embodiment makes product, and physical function parameter is in Table 1.
Comparative example 1
This comparative example and embodiment 6 differences are, in the present embodiment, do not use caking inhibiter, the mass ratio of unclassified stores is constant, PBAT88 weight part, modified talc powder 9.2 weight parts, three [2,4-di-tert-butyl-phenyl] phosphorous acid ester, 0.5 weight part, Octabenzone 0.3 weight part, photostabilizer 0.5 weight part, calcium stearate 1 weight part, ethylene bis stearamide 0.5 weight part, this comparative example makes the performance perameter of product D1 in Table 1.
Comparative example 2
This comparative example and embodiment 6 differences are, in the present embodiment, do not use modified talc powder, the mass ratio of unclassified stores is constant, PBAT97 weight part, three [2,4-di-tert-butyl-phenyl] phosphorous acid ester 0.4 weight part, Octabenzone 0.2 weight part, photostabilizer 0.4 weight part, the SR1000.6 weight part of vapour Bagong department, calcium stearate 0.9 weight part, ethylene bis stearamide 0.5 weight part, this comparative example makes the performance perameter of product D2 in Table 1.
Comparative example 3
This comparative example and embodiment 6 differences are, modified talc powder in the present embodiment and PBAT content done change, the weight ratio of PBAT and other components remains unchanged substantially, PBAT94 weight part, modified talc powder 3 weight parts, this comparative example makes the performance perameter of product D3 in Table 1.
Comparative example 4
This comparative example and embodiment 1 difference be modified talc powder in the present embodiment and PBAT content done change, the weight ratio of PBAT and other components remains unchanged substantially, PBAT38 weight part, modified talc powder 60 weight parts, this comparative example makes the performance perameter of product D3 in Table 1.
Table 1
| Composition (parts by weight) | A1 | A2 | A3 | A4 | A5 | A6 | A7 | D1 | D2 | D3 | D4 |
| PBAT | 57 | 62 | 68 | 72 | 78 | 88 | 88 | 88 | 97 | 94 | 38 |
| Modified talc powder | 40 | 35 | 29 | 25 | 19 | 9 | 9 | 9.2 | 0 | 3 | 60 |
| Oxidation inhibitor | 0.4 | 0.1 | 0.9 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.4 | 0.4 | 0.3 |
| Uv-absorbing agent | 0.2 | 0.5 | 0.2 | 0.9 | 0.4 | 0.2 | 0.2 | 0.3 | 0.2 | 0.2 | 0.15 |
| Photostabilizer | 0.4 | 0.8 | 0.1 | 0.4 | 0.6 | 0.4 | 0.4 | 0.5 | 0.4 | 0.4 | 0.3 |
| Caking inhibiter | 0.6 | 0.1 | 0.8 | 0.2 | 0.6 | 0.6 | 0.6 | 0 | 0.6 | 0.6 | 0.45 |
| Lubricant | 0.9 | 0.9 | 0.9 | 0.2 | 0.5 | 0.9 | 0.9 | 1 | 0.9 | 0.9 | 0.5 |
| Dispersion agent | 0.5 | 0.6 | 0.1 | 0.9 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.3 |
| Tensile strength (Mpa) | 19 | 20.5 | 23 | 24.7 | 25.9 | 21 | 18 | 21.3 | 14 | 15 | 10 |
| Elongation at break (%) | 420 | 490 | 520 | 560 | 640 | 600 | 589 | 598 | 570 | 580 | 300 |
| Dynamic friction factor | 0.15 | 0.30 | 0.13 | 0.26 | 0.20 | 0.21 | 0.19 | 0.8 | 0.23 | 0.25 | 0.19 |
| Static friction factor | 0.22 | 0.39 | 0.20 | 0.37 | 0.25 | 0.27 | 0.25 | 0.85 | 0.28 | 0.30 | 0.27 |
From embodiment 7 and embodiment 6, comparatively desirable mixing method is first to mix PBAT and modified talc powder, after add unclassified stores; From comparative example 2 and embodiment 6, on the basis of elongation at break that guarantees mulch film, modified talc powder can improve the tensile strength of mulch film; By comparative example 1 and the known caking inhibiter of embodiment 6, can significantly reduce frictional coefficient; From comparative example 3 and embodiment 6 and comparative example 4 and embodiment 1, the quality proportioning of each material provided by the invention is optimum ratio, in the scope that the content of modified talc powder is not stipulated in the claims in the present invention, the mulching film stretching intensity making is undesirable, and this is that modified talc powder can improve the mechanical strength of PBAT because within the specific limits, but content is too much, modified talc powder is dispersed poor in matrix resin, easily produces agglomeration, causes mechanical property significantly to reduce; From embodiment 1-7 and comparative example 3-4, within the specific limits, the tensile strength of mulch film presents and first increases the trend reducing afterwards with talcum powder content, when reaching 20 weight part, talcum powder content reaches maximum value, the content of the caking inhibiter adding is more, the frictional coefficient of mulch film is less, has exceeded the scope of the claims in the present invention regulation, and the mulch film making can not meet simultaneously and to have good tensile property and frictional behaviour.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a composition that contains PBAT, is characterized in that, described composition contains PBAT, modified talc powder, oxidation inhibitor, uv-absorbing agent, photostabilizer, caking inhibiter, lubricant and dispersion agent; The gross weight of described composition of take is benchmark, the content of described PBAT is 55-90 % by weight, the content of described modified talc powder is 5-40 % by weight, the content of described oxidation inhibitor is 0.1-1 % by weight, the content of described uv-absorbing agent is 0.1-1 % by weight, the content of described photostabilizer is 0.05-1 % by weight, and the content of described caking inhibiter is 0.1-1 % by weight, and the content of described lubricant is that the content of 0.1-1 % by weight and described dispersion agent is 0.05-1 % by weight.
2. composition according to claim 1, wherein, described modified talc powder contains talcum powder and properties-correcting agent, and described properties-correcting agent is selected from one or more in stearic acid, sodium stearate and Zinic stearas, the talcum powder of 100 weight parts of take is benchmark, and the content of described properties-correcting agent is 0.1-1 weight part.
3. composition according to claim 1, wherein, the density of described PBAT is 1.24-1.27g/cm
3, at 190 ℃, melting index is 2-4g/10min, and fusing point is not less than 115 ℃, and weight-average molecular weight is 50,000-80,000;
Described oxidation inhibitor is four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and/or three [2,4-di-tert-butyl-phenyl] phosphorous acid ester;
Described uv-absorbing agent is Octabenzone;
Described photostabilizer is succinic acid and 4-hydroxyl-2, the polymkeric substance of 2,6,6-tetramethyl--1-piperidine alcohols;
Described caking inhibiter is the caking inhibiter that the trade mark of silicon-dioxide and/or vapour Bagong department is SR100;
Described lubricant is Zinic stearas and/or calcium stearate; Described dispersion agent is polyethylene wax and/or ethylene bis stearamide.
4. a preparation method who contains the composition of PBAT, is characterized in that, the method comprises PBAT, modified talc powder, oxidation inhibitor, uv-absorbing agent, photostabilizer, caking inhibiter, lubricant and dispersant, then by mixture extruding pelletization; It is benchmark that the consumption of each component makes to take the gross weight of described composition, the content of described PBAT is 55-90 % by weight, the content of described modified talc powder is 5-40 % by weight, the content of described oxidation inhibitor is 0.1-1 % by weight, the content of described uv-absorbing agent is 0.1-1 % by weight, the content of described photostabilizer is 0.05-1 % by weight, and the content of described caking inhibiter is 0.1-1 % by weight, and the content of described lubricant is that the content of 0.1-1 % by weight and described dispersion agent is 0.05-1 % by weight.
5. method according to claim 4, wherein, described modified talc powder contains talcum powder and properties-correcting agent, and described properties-correcting agent is selected from one or more in stearic acid, sodium stearate and Zinic stearas, the talcum powder of 100 weight parts of take is benchmark, and the consumption of described properties-correcting agent is 0.1-1 weight part.
6. method according to claim 4, wherein, the density of described PBAT is 1.24-1.27g/cm
3, at 190 ℃, melting index is 2-4g/10min, and fusing point is not less than 115 ℃, and weight-average molecular weight is 50,000-80,000;
Described oxidation inhibitor is four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and/or three [2,4-di-tert-butyl-phenyl] phosphorous acid ester;
Described uv-absorbing agent is Octabenzone;
Described photostabilizer is succinic acid and 4-hydroxyl-2, the polymkeric substance of 2,6,6-tetramethyl--1-piperidine alcohols;
Described caking inhibiter is the caking inhibiter that the trade mark of silicon-dioxide and/or vapour Bagong department is SR100;
Described lubricant is Zinic stearas and/or calcium stearate;
Described dispersion agent is polyethylene wax and/or ethylene bis stearamide.
7. method according to claim 4, wherein, the method of PBAT, modified talc powder, oxidation inhibitor, uv-absorbing agent, photostabilizer, caking inhibiter, lubricant and dispersant is comprised: first PBAT and described modified talc powder are mixed, then the mixture obtaining is mixed with described oxidation inhibitor, described uv-absorbing agent, described photostabilizer, described caking inhibiter, described lubricant and described dispersion agent.
8. method according to claim 4, wherein, described extruding pelletization carries out in twin-screw extrusion forming machine, and the length-to-diameter ratio of described twin-screw extrusion forming machine is 40:1-50:1, and extrusion temperature is 125-135 ℃, and screw speed is 100-300r/min.
9. method according to claim 4 wherein, before described method is also included in mixing, is dried talcum powder 1-2h and PBAT is dried at 50-80 ℃ to 1-2h at 80-120 ℃.
10. a PBAT complete biodegradable mulch film, is characterized in that, described mulch film contains any one in claim 1-3 or described in any one, method prepares in claim 4-9 the composition that contains PBAT.
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| CN107936495A (en) * | 2017-12-04 | 2018-04-20 | 四川大学 | A kind of uvioresistant high water resistant PBAT films and preparation method thereof |
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