Polypropylene composite material for household appliance shell and preparation method thereof

A composite material and polypropylene technology, applied in the polymer field, can solve the problems of dimensional stability of injection molded parts, difficulty in assembly of the whole machine, difficult to meet the requirements of use, and the effect is not very ideal, so as to shorten the cooling molding time, increase the Effective utilization and shortened storage time

Inactive Publication Date: 2020-05-01
ORINKO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polypropylene is widely used in the shell of household appliances because of its good surface gloss and low price; polypropylene is a crystalline material, and its shrinkage rate is about 1.6-2.0 according to its crystallinity. During the injection molding process of polypropylene, Segment rearrangement and secondary crystallization will occur, making the injection molded parts continue to shrink after molding, and it will take a long time to achieve dimensional stability, which brings certain challenges to the dimensional stability of the injection molded parts and the assembly of the whole machine. Difficulties
[0003] In order to reduce the aftershrinkage of polypropylene materials, the commonly used methods are to select polypropylene with higher isotacticity, or to add nucleating agents to make polypropylene composite materials nucleate and crystallize rapidly during injection molding, but the effect is not very good. Ideally, polypropylene shrinkage should be stable for at least 24 hours, and it is difficult to meet the use requirements

Method used

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  • Polypropylene composite material for household appliance shell and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] A kind of polypropylene composite material for home appliance casing, comprises the raw material of following parts by weight:

[0032] 83 parts of homopolypropylene, 12 parts of precipitated barium sulfate, 5 parts of magnesium sulfate whiskers, 2 parts of silicone, 0.2 parts of phosphate metal salt nucleating agent, 0.2 parts of antioxidant 1010, 0.2 parts of antioxidant 168, hard 0.3 parts of calcium stearate, 0.4 parts of N,N-ethylenebisstearamide, and 1 part of titanium dioxide.

[0033] Among them, the homopolypropylene has an isotacticity of 98% and a crystallinity of 90%.

[0034] The preparation method of the polypropylene composite material for the housing of household appliances comprises the following steps:

[0035] S1. Weigh raw materials by weight, mix 12 parts of precipitated barium sulfate with 0.1 part of calcium stearate and 0.2 part of N,N-ethylenebisstearamide;

[0036] S2. 83 parts of homopolypropylene, 5 parts of magnesium sulfate whiskers, 2 pa...

Embodiment 2

[0040] A kind of polypropylene composite material for home appliance casing, comprises the raw material of following parts by weight:

[0041] 96 parts of homopolypropylene, 2 parts of precipitated barium sulfate, 2 parts of magnesium sulfate whiskers, 0.1 part of phosphate metal salt nucleating agent, 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168, 0.3 part of calcium stearate , 0.2 parts of N,N-ethylenebisstearamide.

[0042] Among them, the homopolypropylene has an isotacticity of 97.5% and a crystallinity of 85%.

[0043] The preparation method of the polypropylene composite material for the housing of household appliances comprises the following steps:

[0044] S1. Weigh raw materials by weight, mix 2 parts of precipitated barium sulfate with 0.1 part of calcium stearate and 0.1 part of N,N-ethylenebisstearamide;

[0045] S2. 96 parts of homopolypropylene, 2 parts of magnesium sulfate whiskers, and 0.2 parts of phosphate metal salt nucleating agent were mixed...

Embodiment 3

[0049] A kind of polypropylene composite material for home appliance casing, comprises the raw material of following parts by weight:

[0050] 83 parts of homopolypropylene, 10 parts of precipitated barium sulfate, 7 parts of magnesium sulfate whiskers, 2 parts of erucamide, 0.5 parts of sorbitol nucleating agent, antioxidant 1010 0.2 antioxidant DLTP 0.2 parts, stearic acid 0.3 parts of calcium, 0.4 parts of N,N-ethylenebisstearamide, and 1 part of phthalocyanine blue.

[0051] Among them, the homopolypropylene has an isotacticity of 97% and a crystallinity of 80%.

[0052] The preparation method of the polypropylene composite material for the housing of household appliances comprises the following steps:

[0053] S1. Weigh raw materials by weight, mix 10 parts of precipitated barium sulfate with 0.1 part of calcium stearate, and 0.2 part of N,N-ethylenebisstearamide;

[0054] S2. 83 parts of homopolypropylene, 7 parts of magnesium sulfate whiskers, 2 parts of erucamide, an...

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Abstract

The invention discloses a polypropylene composite material for a household appliance shell and a preparation method thereof. The material comprises the following raw materials in parts by weight: 80-96 parts of homo-polypropylene, 2-17 parts of precipitated barium sulfate, 1-7 parts of whiskers, 0.1-0.5 part of a nucleating agent, 0.2-0.4 part of an antioxidant, 0.5-0.7 part of a dispersing agent,0-2 parts of a scratch-resistant agent, 0-5 parts of talcum powder and 0-1 part of toner, wherein the isotacticity of the homo-polypropylene is 97-98%, and the crystallinity of the homo-polypropyleneis greater than or equal to 80%. According to the polypropylene composite material prepared by the invention, an injection molding product has the characteristics of high gloss, scratch resistance, low after-shrinkage and the like, the defect of large after-shrinkage of a polypropylene material is overcome, and the technical bottleneck of PP household appliance shell materials is solved.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a polypropylene composite material for a home appliance casing and a preparation method thereof. Background technique [0002] Polypropylene is a thermoplastic resin produced by the polymerization of propylene, usually a translucent, colorless solid, odorless and non-toxic. With excellent physical properties and good chemical stability, it is one of the most widely used general-purpose plastics. Polypropylene is widely used in the shell of household appliances because of its good surface gloss and low price; polypropylene is a crystalline material, and its shrinkage rate is about 1.6-2.0 according to its crystallinity. During the injection molding process of polypropylene, Segment rearrangement and secondary crystallization will occur, making the injection molded parts continue to shrink after molding, and it will take a long time to achieve dimensional stability, which b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L83/04C08K13/04C08K7/08C08K3/30C08K3/32C08K3/34
CPCC08K3/30C08K3/32C08K3/34C08K7/08C08K13/04C08K2003/3045C08K2003/321C08K2201/005C08L23/12C08L83/04C08L2205/24
Inventor 徐元元邢纪普吴摞李荣群
Owner ORINKO NEW MATERIAL CO LTD
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