CN112795083B - High-glossiness polypropylene composition and preparation method and application thereof - Google Patents
High-glossiness polypropylene composition and preparation method and application thereof Download PDFInfo
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- CN112795083B CN112795083B CN202011541915.5A CN202011541915A CN112795083B CN 112795083 B CN112795083 B CN 112795083B CN 202011541915 A CN202011541915 A CN 202011541915A CN 112795083 B CN112795083 B CN 112795083B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/10—Peculiar tacticity
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Abstract
The invention discloses a high-gloss polypropylene composition which comprises the following components in parts by weight: 100 parts of homo-polypropylene with high isotacticity; 2-12 parts of ultra-high melt index polypropylene; 10-50 parts of inorganic filler. According to the invention, a small amount of ultrahigh melt index polypropylene is added into the polypropylene composition mainly containing the high isotacticity homopolymerized polypropylene, so that the technical defects that the high isotacticity homopolymerized polypropylene cannot achieve both low shrinkage and high gloss are overcome, the thermal oxidation aging resistance of the material can be improved, and the high-gloss ultrahigh melt index polypropylene can be widely applied to the fields of household appliances and electronic appliances.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a high-glossiness polypropylene composition and a preparation method and application thereof.
Background
The polypropylene has excellent surface gloss and good mechanical property, so that the polypropylene is widely applied in the field of household appliances at present, and the polypropylene has low cost, can be used as an ideal material for replacing high-gloss products such as ABS, HIPS, PC/ABS and the like, and has attracted more and more attention by people.
In the application of electronic and electric appliance shells, materials are generally required to have excellent glossiness, good rigidity and low shrinkage rate. There are many documents on high gloss and low shrinkage of polypropylene:
the high-gloss technology is mainly realized by adding a nucleating agent to improve the crystallinity of polypropylene or refine spherical crystals or selecting inorganic powder (usually barium sulfate) with a specific microstructure and having no interference effect on light reflection. Such as chinese patent CN 101190985, by adding a nucleating agent to improve gloss, but the shrinkage is larger.
The low shrinkage technology is mainly realized by adding polyethylene or elastomers such as POE, SEBS, EPDM and the like and fillers (talcum powder, mica powder, glass fiber and the like) with a certain length-diameter ratio. Such as chinese patent CN103059411A, reduces shrinkage by adding polyethylene, elastomer, whiskers and glass fibers, but has the defect of warp deformation due to orientation of whiskers and glass fibers.
The prior art does not report high gloss and low shrinkage at the same time.
Disclosure of Invention
The invention aims to provide a high-gloss polypropylene composition which has the advantages of high gloss, good heat-resistant aging resistance and low shrinkage.
Another object of the present invention is to provide a process for the preparation and use of the above high gloss polypropylene composition.
The invention is realized by the following technical scheme:
the high-gloss polypropylene composition comprises the following components in parts by weight:
100 parts of homo-polypropylene with high isotacticity;
2-12 parts of ultra-high melt index polypropylene;
10-50 parts of inorganic filler.
The isotacticity of the homo-polypropylene with high isotacticity is more than or equal to 98 percent.
The weight average molecular weight of the homo-polypropylene with high isotacticity is in the range of 25-35 ten thousand.
The ultra-high melting means that the weight average molecular weight of the polypropylene is in the range of 4-10 ten thousand.
The inorganic filler is at least one selected from barium sulfate, talcum powder, calcium carbonate, calcium sulfate, wollastonite, mica and glass beads.
Whether certain amounts of antioxidant and lubricant are added can be judged according to actual conditions, and the addition amount of the antioxidant can be 0-1 part by weight and the addition amount of the lubricant can be 0-1 part by weight.
The antioxidant can be a mixture of a hindered phenol main antioxidant and a phosphite ester or thioether auxiliary antioxidant, and the lubricant can be one or a mixture of more than two of metal soaps, stearic acid complex esters and amides.
The metal soap may be selected from zinc stearate.
The preparation method of the high-gloss polypropylene composition comprises the following steps: uniformly mixing high isotactic polypropylene, ultrahigh melt index polypropylene and inorganic filler in proportion, adding the mixture into a double-screw extruder, extruding and granulating to obtain a heat-aging-resistant polypropylene composition; wherein, the temperature is 200 ℃ to 230 ℃, the rotating speed range is 300 ℃ to 400 r/min;
if antioxidant and lubricant are contained, they are mixed with ultrahigh molecular weight polypropylene.
The high-gloss polypropylene composition is applied to the field of electronic and electric appliances. Can be a household appliance shell or a structural frame of household appliance parts.
The invention has the following beneficial effects:
according to the invention, a small amount of ultrahigh melt index polypropylene is added into the polypropylene composition mainly containing the high isotacticity homopolymerized polypropylene, so that the technical defects that the high isotacticity homopolymerized polypropylene cannot achieve both low shrinkage and high gloss are overcome, the thermal oxidation aging resistance of the material can be improved, and the high-gloss ultrahigh melt index polypropylene can be widely applied to the fields of household appliances and electronic appliances.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The raw materials used in the invention are as follows:
homo-polypropylene with high isotacticity: the isotacticity is more than 98 percent, the weight-average molecular weight is 28 ten thousand, and the mark is Korean HJ 4045.
Medium gauge polypropylene: 96 percent of isotacticity, 30 ten thousand of weight average molecular weight and the brand name of petrochemical N-Z30S.
Low isotactic polypropylene: 92% of isotacticity, 28 ten thousand of weight average molecular weight and the mark of Letian J-570S.
Ultra high melt index polypropylene: the weight average molecular weight was 8 ten thousand and was designated as MF650Y from PolyMirae.
Talc powder: the humanized chemical TYT-777A, 3000 mesh.
Barium sulfate: barium sulfide is precipitated by the Guangxi Xiangzhou chemical industry.
Lubricant: and (3) zinc stearate.
Examples and comparative examples a process for the preparation of high gloss polypropylene compositions comprising the steps of: uniformly mixing high isotactic polypropylene, ultrahigh melt index polypropylene, barium sulfate, talcum powder and a lubricant in proportion, adding the mixture into a double-screw extruder, extruding and granulating to obtain a heat-aging-resistant polypropylene composition; wherein, the temperature is 200 ℃ to 230 ℃, the rotating speed range is 300 ℃ to 400 r/min;
the test method comprises the following steps:
(1) gloss: the degree to which the surface of the object is close to a mirror surface is indicated by a number. Evaluation of gloss may be conducted
With a gloss meter, the measurement is usually made with 20 °, 45 °, 60 ° or 85 ° angle illumination, mainly 60 ° angle, depending mainly on the angle of illumination and observation of the light source. The test method comprises the following steps: gloss data were read directly at 60 ° using a gloss meter placed flat on a 2.0mm by 100mm square plate.
(2) Heat aging resistance: the compound was injection molded into 100mm by 2mm square plaques, which were placed in a forced convection oven at a temperature of 150 ℃ and evaluated by recording the time, in hours, at which chalking occurred.
(3) Shrinkage rate: the shrinkage after 72 hours of demolding was recorded according to the test of ISO 2577-2007 standard.
(4) And (3) isotacticity: testing according to GB/T2412-2008 standard.
Table 1: EXAMPLES content (parts by weight) of each component of the thermal aging resistant polypropylene composition and test results
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Homo-polypropylene with high isotacticity | 100 | 100 | 100 | 100 | 100 | 100 |
| Ultra-high melt index polypropylene | 4 | 2 | 6 | 8 | 12 | 7 |
| Barium sulfate | 15 | 15 | 15 | 15 | 15 | 20 |
| Talcum powder | 5 | 5 | 5 | 5 | 5 | 10 |
| Lubricant agent | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
| Degree of gloss, degree of gloss | 88 | 86 | 88 | 89 | 90 | 88 |
| Resistance to thermal oxygen aging in hours | 1560 | 1272 | 1680 | 1752 | 1440 | 1728 |
| Shrinkage ratio% | 1.21 | 1.23 | 1.19 | 1.15 | 1.16 | 1.18 |
From examples 1 to 4, it is understood that as the amount of the ultra high melt index polypropylene added increases, the gloss increases, the thermo-oxidative aging resistance increases first and then decreases, and the shrinkage decreases.
Table 2: comparative example Heat aging resistant Polypropylene composition Each component content (parts by weight) and test results
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Homo-polypropylene with high isotacticity | 100 | 100 | 100 | ||
| Isotactic polypropylene | 100 | ||||
| Low isotacticity polypropylene | 100 | ||||
| Ultra-high melt index polypropylene | 4 | 4 | 1 | 15 | |
| Barium sulfate | 15 | 15 | 15 | 15 | 15 |
| Talcum powder | 5 | 5 | 5 | 5 | 5 |
| Lubricant agent | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Degree of gloss, degree of gloss | 82 | 83 | 80 | 83 | 84 |
| Resistance to thermal oxygen aging in hours | 1152 | 1248 | 1152 | 1200 | 1032 |
| Shrinkage ratio% | 1.35 | 1.38 | 1.41 | 1.37 | 1.26 |
As can be seen from comparative examples 1 to 3, other types of polypropylene cannot achieve the technical effects of the present invention.
From comparative example 4/5, it is clear that ultra high melt means that the addition of polypropylene is too high or too low and the technical effect is not good.
Claims (5)
1. The high-gloss polypropylene composition is characterized by comprising the following components in parts by weight:
100 parts of homo-polypropylene with high isotacticity;
2-12 parts of ultra-high melt index polypropylene;
10-50 parts of inorganic filler;
the ultra-high melting means that the weight-average molecular weight of the polypropylene is 4-10 ten thousand;
the isotacticity of the homo-polypropylene with high isotacticity is more than or equal to 98 percent, and the weight-average molecular weight range is 25-35 ten thousand.
2. The high gloss polypropylene composition according to claim 1, wherein said inorganic filler is at least one selected from the group consisting of barium sulfate, talc, calcium carbonate, calcium sulfate, wollastonite, mica, and glass beads.
3. The high gloss polypropylene composition according to claim 1, further comprising 0-2 parts by weight of one or more of an antioxidant and a lubricant.
4. The process for the preparation of a high gloss polypropylene composition according to any one of claims 1-2, comprising the steps of: uniformly mixing high isotactic polypropylene, ultrahigh melt index polypropylene and inorganic filler in proportion, adding the mixture into a double-screw extruder, extruding and granulating to obtain a high-gloss polypropylene composition; wherein the temperature range of the screw is 200-230 ℃, and the rotating speed range is 300-400 r/min.
5. Use of the high gloss polypropylene composition according to any one of claims 1 to 3 in the field of electronics.
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| CN112795083B true CN112795083B (en) | 2022-06-07 |
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| CN113861554B (en) * | 2021-09-07 | 2023-08-29 | 金发科技股份有限公司 | High-gloss and well-dispersed polypropylene talcum powder master batch and preparation method and application thereof |
| CN114058119B (en) * | 2021-11-08 | 2023-09-26 | 金发科技股份有限公司 | Polypropylene mica master batch and preparation method and application thereof |
| CN114163721B (en) * | 2021-11-08 | 2023-08-29 | 金发科技股份有限公司 | Polypropylene calcium carbonate master batch and preparation method and application thereof |
| CN114230916B (en) * | 2021-12-23 | 2023-10-03 | 江苏金发科技新材料有限公司 | Polypropylene composite material and preparation method and application thereof |
| CN116041852B (en) * | 2022-12-30 | 2024-09-03 | 天津金发新材料有限公司 | Polypropylene material and preparation method and application thereof |
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| CN102276916B (en) * | 2011-07-26 | 2014-03-26 | 成都市新津事丰医疗器械有限公司 | High-gloss polypropylene material |
| CN107226956A (en) * | 2016-03-23 | 2017-10-03 | 合肥杰事杰新材料股份有限公司 | A kind of Low-shrinkage polypropylene composition and preparation method thereof |
| KR101947230B1 (en) * | 2016-05-18 | 2019-05-10 | 현대자동차주식회사 | Non-paint metallic Polypropylene composite |
| CN109456538B (en) * | 2018-10-12 | 2021-06-25 | 万华化学集团股份有限公司 | Polypropylene composite material with low density, low shrinkage and silver metal texture and preparation method thereof |
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