CN101746556A - Thermostable polystyrene packing composition and preparing method - Google Patents
Thermostable polystyrene packing composition and preparing method Download PDFInfo
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- CN101746556A CN101746556A CN200810181957A CN200810181957A CN101746556A CN 101746556 A CN101746556 A CN 101746556A CN 200810181957 A CN200810181957 A CN 200810181957A CN 200810181957 A CN200810181957 A CN 200810181957A CN 101746556 A CN101746556 A CN 101746556A
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Abstract
The present invention provides a novel material for producing yoghurt cups by extrusion molding, particularly a polystyrene (PS)/polypropylene (PP) alloy material having the advantages of good ductility, high strength, good stiffness, thermostability, large molding processing range and low cost on account of problems existing in the PS yoghurt packaging. The material consists of 40 to 70% by weight of PS, 15 to 85% by weight of PP, 8% by weight of inorganic mineral powder and 6 to 10% by weight of auxiliary. The raw materials are premixed, and extruded and pelletized by a double-screw extruder under common processing conditions, and a basic resin is produced. Then, a product mutually attached is made by taking the material as a middle layer and taking general purpose polystyrene (GPPS) layers as a top layer and a bottom layer by a three-layer co-extrusion molding processing technique, and the product is molded by co-extrusion without adhesive bonding.
Description
Technical field
The invention belongs to heat-resisting PS packing technique field, be specifically related to a kind of both improved stable on heating PS/PP alloy material of PS and moulding.
Background technology
Polystyrene (PS) is a kind of thermoplastic base resin, because therefore its cheap and easy machine-shaping be able to widespread use.Polystyrene (PS) is divided into GP polystyrene (GPPS) and high impact polystyrene HIPS, wherein GPPS is cinnamic homopolymer, have extraordinary rigidity, the transparency, surface gloss property, coloring, geometrical stability, heat stability, electrical insulation characteristics, and light weight is hard, thermal capacitance is low, good fluidity, easily machine-shaping, can resist the inorganic acid of water and dilution.HIPS is the graft copolymer of styrene and butadidenne, contain 6～8% poly-butadiene rubber, because poly-butadiene is a kind of elastic body, its introducing can obviously improve the toughness of GPPS, though but the introducing strength under shock of rubber increases, pulling strengrth and bending strength to a certain degree descend.Polystyrene resin is used for making disposable tableware, sour milk packing, automobile component, packing, toy, building materials, electrical equipment and the household supplies etc. of daily life.
PS extrudes the sour milk cup of plastics sucking moulding, and rigidity is better, and deflection is good, and surface finish is good, the ink printing strong adhesion, and low temperature resistant freezing excellent performance (20 ℃), but before can, the PS sheet material is moulded cup and is needed sterilization treatment, and this just requires to have good resistance to effect of heat.And PP makes its heat-resisting PS of being better than because it must crystallinity; PS and PP are carried out blend, and reach the resistance to effect of heat that improves PS simultaneously, the purpose of mechanical property.But, because PS and PP belong to the incompatible system of thermodynamics, has higher interfacial tension, the two-phase interface bad adhesion, thereby carry out the material that simple melt blending obtained and not only can cause two-phase interface coarse, but also can make the strength under shock variation, come it is carried out modification so attempt adding compatilizer.Cup taY.B.[Cup taV B, Bhuvanesh Y C.Journal of Applied Po lymer Science, 1996,160:1951～1963.] and H lavata.D.[H lavata D, Ho rak Z, L ednicky F, et al.Polymer N et wo r grace s ﹠amp; Blends, 1997,7 (4): 195～202.] etc. to studies show that of the co-mixing system of PP and high molecular weight PS, add PS after, the system rigidity strengthens.Compatilizer is divided into four types of graft polymer, periodic copolymer, response type and inorganic particles etc. usually, as table 1.
Table 1 is used for the compatilizer of PP/PS blend
Annotate: SB, SBS-styrene butadiene block copolymer; SEBS-styrene ethylene butylene periodic copolymer; SEP-styrene ethylene propylene-based block copolymer; PE-g-PS-polypropylene and phenylethene grafted copolymer; PE-g-PS-polyethylene and phenylethene grafted copolymer; IPP-b-iPS-isotactic polypropylene and isotactic polyphenylacetylene graft copolymer; PP-g-AVM-polypropylene and simple function group aromatic ethenyl monomer graft copolymer; PP-g-MAH-polypropylene and maleic acid (or maleic anhydride) graft copolymer.
[Feng Changgen such as Feng Changgen, the polypropylene/polystyrene blend morphology progress [J] of Li Xin etc. the chemical industry progress, 2004,23 (11): 1179～1183.] the compatible effect to above compatilizer is summarized as follows: SEBS＜SBS＜SEP and SEBS＜PP-g-PP.Shen Yong etc. [Shen Yong, Li Ruihai wait the development [J] of .PP/PS alloy. plastics industry, 2003,31 (9): 15-17,41] and to have studied SBS the morphosis of PP/PS alloy and the influence of mechanical property have been found: the compatible effect of SBS (massfraction is 5%) is obvious.Xu Zhenming [research [D] of the bright .PP/PS alloy of Xu Zhen. Tianjin: University Of Tianjin's Master's thesis, 2000.9.1] etc. employing melt blending expressing technique prepare the PS/PP alloy, result of study shows: the incompatible system of PS/PP is after just like the SEBS compatilizer, can improve the compatibility of system, PS forms a contact bed mutually and between the PP phase, improves the impact and the pulling strengrth of alloy.The brigade commander river, [brigade commander river such as Xi Song, seat Song, Moherin, Deng the influence [J] of .SEP to PP/PS alloy morphology and mechanical property. plastics industry, 2003,31 (8): 16-18] studied the influence of SEP to the PS/PP mechanical property, the result shows that styrene-ethylene/propylene diblock copolymer (SEP) is the good compatilizer of PP/PS alloy, is that 20: 80 the compatibilization effect of alloy is better to m (PP): m (PS).In addition, Li Qingshan (CN00126600), Japanese Patent disclose 156842/1988---and wait patent documentation also to disclose some to PP/PS co-mixing system preparation of compositions method.Being applied to the sour milk packing for the PS/PP alloy does not appear in the newspapers.
Summary of the invention
The objective of the invention is problem at the existence of PS sour milk packing, provide a kind of and have good toughness, intensity height, deflection is good, resistance to effect of heat is high, forming work wide ranges and lower-cost PS/PP alloy material, be applicable to utilize and extrude the new material that the plastic uptake method is produced the sour milk cup.
High-performance PS provided by the invention/PP alloy material, the composition of this alloy material is as follows by weight percentage:
PS 40～70％
PP 10～25％
Inorganic powder fills 8%
Auxiliary agent 6～10%.
The novel PS/PP alloy material of High Performance provided by the invention is by said ratio feed composition to be carried out premix earlier, put into then double screw extrusion machine routinely technological condition carry out the melt blending extruding pelletization and get final product.
The present invention compares with existing material, has the following advantages:
1, because polyethylene and the polystyrene material selected for use in the PS/PP alloy material provided by the invention, under the effect of compound compatilizer, compatibility obtains very big improvement, PP is uniformly dispersed in the PS base-material, thereby obtained excellent modified effect, improve breaking elongation and the notch shock of PS, and by adding GPPS, in the rigidity of loss material not of stable on heating while of raising system, data contrast in seeing Table.
Table 2 performance comparison
2, PS/PP alloy material provided by the present invention by adding corresponding additive (antistatic additive, antiseptic, aromatizing agent etc.), through double-screw melt blending, evenly spreads in the resin matrix auxiliary agent, can satisfy the different demands of client.
3, PS/PP alloy material provided by the present invention, the migration of toxicant does not take place in itself, and nontoxic, free from extraneous odour meets food hygienic standard fully.
4, PS/PP alloy material provided by the present invention is by membrane process moulding paper, and outward appearance is white and opaque.By the co-extrusion processing technology, make three laminates of fitting mutually.The GPPS layer is at upper and lower layer, and the co-extrusion moulded products of this material in the middle level do not need adhesives bonding.
The specific embodiment
Provide embodiment below so that the present invention is carried out concrete description; be necessary to be pointed out that at this following examples only are used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, content still belongs to protection scope of the present invention to some nonessential improvement and the adjustment that the present invention makes to the person skilled in the art in this field according to the present invention.
Embodiment 1
To be 20% HIPS, 40% GPPS, 15% PP, 10% bulking agent, 10% inorganic particle (using coupling agent treatment in advance) by weight percentage, putting into the super mixer that rotating speed is about 1000rpm earlier with the antioxidant of counting 0.5% by their total weightes mixed 3 minutes, and then put into double screw extrusion machine, temperature is controlled at: 200 ℃～215 ℃, extruding pelletization promptly under 450 rev/mins of conditions of screw speed.
Embodiment 2
To be 28% HIPS, 32% GPPS, 12.5%PP, 5% bulking agent, 8% inorganic particle (using coupling agent treatment in advance) by weight percentage, putting into the super mixer that rotating speed is about 1000rpm earlier with the antioxidant of counting 0.5% by their total weightes mixed 3 minutes, and then put into double screw extrusion machine, 200～215 ℃ of processing temperatures, extruding pelletization promptly under 450 rev/mins of conditions of screw speed.
Embodiment 3
To be 28% HIPS, 32% GPPS, 20%PP, 5% bulking agent, 8% inorganic particle (using coupling agent treatment in advance) by weight percentage, putting into the super mixer that rotating speed is about 1000rpm earlier with the antioxidant of counting 0.5% by their total weightes mixed 3 minutes, and then put into double screw extrusion machine, 200～215 ℃ of processing temperatures, extruding pelletization promptly under 450 rev/mins of conditions of screw speed.
Embodiment 4
To be 30% HIPS, 40% GPPS, 30%PP, 5% bulking agent, 10% inorganic particle (using coupling agent treatment in advance) by weight percentage, putting into the super mixer that rotating speed is about 1000rpm earlier with the antioxidant of counting 0.5% by their total weightes mixed 3 minutes, and then put into double screw extrusion machine, 200～215 ℃ of processing temperatures, extruding pelletization promptly under 450 rev/mins of conditions of screw speed.
Claims (5)
1. the present invention adopts the three-layer co-extruded sour milk packing that goes out the forming process preparation for a kind of, and is composed as follows:
Levels is GPPS (it melts to refer to be 4g/min)
The middle level is an alloy material
2. alloy synthetic paper according to claim 1, the composition of described alloy material is as follows by weight percentage:
PS 40～70％
PP 10～25％
Inorganic powder fills 8%
Auxiliary agent 6～10%.
It is characterized in that: General Purpose Polystyrenre that affiliated PS is and high impact polystyrene, it melts finger and is 3～5g/min; Affiliated PP is the polypropylene of copolymerization, and it melts to refer to be 1～3g/min; Under inorganicly be filled in ground calcium carbonate, french talc, the precipitated calcium carbonate one or both, its particle diameter is 1250 orders; Affiliated auxiliary agent comprises: lubricant (Tissuemat E, liquid paraffin, stearate); Compatilizer (buna-S, polystyrene-ethylene-propylene-styrene block copolymer, polystyrene-ethylene-butadiene-styrene periodic copolymer, polystyrene-butadiene-styrene copolymer)
3. functional additive according to claim 1 mainly comprises: antiseptic, brightening agent.
4. auxiliary agent according to claim 1 mainly comprises: lubricant, stabilizer and aging inhibitor.
5. a method for preparing the sour milk packaging cup comprises the following steps: that PS, PP, inorganic powder are filled, auxiliary agent premixed → alloy material extruding pelletization → three layer sour milk cup extruded plastics sucking moulding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810181957A CN101746556A (en) | 2008-11-28 | 2008-11-28 | Thermostable polystyrene packing composition and preparing method |
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| CN200810181957A CN101746556A (en) | 2008-11-28 | 2008-11-28 | Thermostable polystyrene packing composition and preparing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673069A (en) * | 2012-04-17 | 2012-09-19 | 芜湖市弘瑞包装制品有限公司 | High-strength plastic composite sheet for food cup |
| CN102673074A (en) * | 2012-04-17 | 2012-09-19 | 芜湖市瑞诚工贸有限公司 | Plastic composite sheet for food cup |
| CN104497464A (en) * | 2014-12-24 | 2015-04-08 | 金发科技股份有限公司 | High-rigidity high-fluidity polystyrene composition and preparation method and application thereof |
| CN108570247A (en) * | 2018-04-11 | 2018-09-25 | 湖南师范大学 | A kind of Aluminate modified heavy calcium carbonate and preparation method thereof and a kind of poly styrene composite material |
-
2008
- 2008-11-28 CN CN200810181957A patent/CN101746556A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673069A (en) * | 2012-04-17 | 2012-09-19 | 芜湖市弘瑞包装制品有限公司 | High-strength plastic composite sheet for food cup |
| CN102673074A (en) * | 2012-04-17 | 2012-09-19 | 芜湖市瑞诚工贸有限公司 | Plastic composite sheet for food cup |
| CN102673069B (en) * | 2012-04-17 | 2014-10-29 | 芜湖市弘瑞包装制品有限公司 | High-strength plastic composite sheet for food cup |
| CN102673074B (en) * | 2012-04-17 | 2014-12-10 | 芜湖市瑞诚工贸有限公司 | Plastic composite sheet for food cup |
| CN104497464A (en) * | 2014-12-24 | 2015-04-08 | 金发科技股份有限公司 | High-rigidity high-fluidity polystyrene composition and preparation method and application thereof |
| CN104497464B (en) * | 2014-12-24 | 2017-11-17 | 成都金发科技新材料有限公司 | A kind of high rigidity high fluidity polyphenylacetylene combination and its preparation method and application |
| CN108570247A (en) * | 2018-04-11 | 2018-09-25 | 湖南师范大学 | A kind of Aluminate modified heavy calcium carbonate and preparation method thereof and a kind of poly styrene composite material |
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Application publication date: 20100623 |