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A kind of microfoam polyoxymethylene material and preparation method thereof

A polyoxymethylene material and micro-foaming technology, applied in the field of plastic molding processing, can solve the problems of low notched impact strength, limited wide application, large molding shrinkage rate, etc., and achieve the effect of low density, high application prospect and low cost

Inactive Publication Date: 2018-01-02
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

POM has good self-lubricating properties, good fatigue resistance, low friction coefficient, resistance to organic solvents, simple molding and processing, and good processing characteristics in a wide range of temperature and humidity, but it is easy to form larger spherulites. As a result, the processed samples have disadvantages such as low notched impact strength and large molding shrinkage, which limit their wide application in certain fields. Therefore, it is necessary to improve its performance through modification to meet the growing special needs. The use of micro-foam molding technology can effectively reduce the density of polyoxymethylene products, making polyoxymethylene materials lightweight, and at the same time can improve the impact performance of products, which will push the market application of polyoxymethylene materials to a wider range of fields

Method used

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  • A kind of microfoam polyoxymethylene material and preparation method thereof
  • A kind of microfoam polyoxymethylene material and preparation method thereof
  • A kind of microfoam polyoxymethylene material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of slightly foamed polyoxymethylene material, each raw material used in its preparation process is calculated by weight, and its composition and content are as follows:

[0033] POM 980 parts

[0034] Homemade POE-AC foam masterbatch 20 parts

[0035] Its preparation process specifically comprises the following steps:

[0036] Mix 980g of polyoxymethylene and 20g of self-made foaming masterbatches that have been dried in a vacuum oven at 80°C for 4 hours in advance, and use a modified injection molding machine to obtain polyoxymethylene foam samples. The injection molding temperature is 170-190°C and the injection pressure is 60- 90MPa, the cooling time is 20-40s. That is, a polyoxymethylene foamed sample is prepared.

[0037] The amount of the self-made foaming masterbatch in the micro-foamed polyoxymethylene obtained above is theoretically calculated as 2% by total weight percentage.

Embodiment 2

[0039] A kind of slightly foamed polyoxymethylene material, each raw material used in its preparation process is calculated by weight, and its composition and content are as follows:

[0040] POM 940 parts

[0041] Homemade POE-AC foam masterbatch 60 parts

[0042] Its preparation process specifically comprises the following steps:

[0043] Mix 940g of polyoxymethylene and 60g of self-made foaming masterbatches that have been dried in a vacuum oven at 80°C for 4 hours in advance, and use a modified injection molding machine to obtain polyoxymethylene foam samples. The injection molding temperature is 170-190°C and the injection pressure is 60- 90MPa, the cooling time is 20-40s. That is, a polyoxymethylene foamed sample is prepared.

[0044] The amount of the self-made foaming masterbatch in the micro-foamed polyoxymethylene obtained above is theoretically calculated as 6% by total weight percentage.

Embodiment 3

[0046] A kind of slightly foamed polyoxymethylene material, each raw material used in its preparation process is calculated by weight, and its composition and content are as follows:

[0047] POM 900 parts

[0048] Homemade POE-AC foam masterbatch 100 parts

[0049] Its preparation process specifically comprises the following steps:

[0050] Mix 900g of polyoxymethylene and 100g of self-made foaming masterbatches that have been dried in a vacuum oven at 80°C for 4 hours in advance, and use a modified injection molding machine to obtain polyoxymethylene foam samples. The injection molding temperature is 170-190°C and the injection pressure is 60- 90MPa, the cooling time is 20-40s. That is, a polyoxymethylene foamed sample is prepared.

[0051] The amount of self-made foaming masterbatch in the micro-foamed polyoxymethylene obtained above is theoretically calculated as 10% by total weight percentage.

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Abstract

The invention discloses a micro-foamed polyformaldehyde material and a preparation method thereof. The preparation method is characterized by firstly blending dried polyformaldehyde with a foaming masterbatch or a microsphere foaming agent and then preparing a polyformaldehyde foaming sample by adopting a refitted injection molding machine, wherein the injection molding temperature is 170-190 DEG C; the injection molding pressure is 60-120MPa; the cooling time is 20-40 seconds. The micro-foamed polyformaldehyde material and the preparation method have the beneficial effects that the preparation process is simple and is low in equipment input; the prepared micro-foamed polyformaldehyde material has low density and has cell density of 13.85*10<6>cells / cm<3> and cell size as small as 27.75mu m; cells are uniformly distributed and are closed; the density of the product is as low as 1.008g / cm<3> and the impact strength of the product is as high as 12.35KJ / m<2>; the micro-foamed polyformaldehyde material has excellent properties and has a higher application prospect in the fields of transportation industry, aircraft industry, and the like.

Description

technical field [0001] The invention belongs to the technical field of plastic molding processing, and in particular relates to a microfoamed polyoxymethylene material and a preparation method thereof. Background technique [0002] Polyoxymethylene (POM) is a highly crystalline polymer with a density of 1.4g / cm 3 , less than 1 / 4 of steel, has the hardness, strength and rigidity similar to metal, and is one of the varieties whose mechanical properties are closest to metal materials in engineering plastics. POM has good self-lubricating properties, good fatigue resistance, low friction coefficient, resistance to organic solvents, simple molding and processing, and good processing characteristics in a wide range of temperature and humidity, but it is easy to form larger spherulites. As a result, the processed samples have disadvantages such as low notched impact strength and large molding shrinkage, which limit their wide application in certain fields. Therefore, it is necessa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/00C08L23/08C08L23/06C08L91/06C08J9/10C08J9/32B29C44/42B29C44/44B29C44/60
CPCB29C44/42B29C44/44B29C44/60C08J9/103C08J9/32C08J2203/04C08J2205/044C08J2359/00C08J2423/06C08J2423/08C08J2491/06C08L59/00C08L2203/14C08L2207/066C08L23/0815C08L23/06C08L91/06
Inventor 欧阳春发赵正创张旺高群赵亮龚冰
Owner SHANGHAI INST OF TECH