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Polyacetal resin composition and preparation method thereof

A technology of polyacetal resin and composition, which is applied in the field of resin products, and can solve problems such as increased cost and reduced product strength

Inactive Publication Date: 2014-08-20
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the above inventions all increase the toughness of polyacetal by adding mineral fillers or elastomers, but all of them will lead to a decrease in product strength, and at the same time, the addition of elastomers will also increase the cost

Method used

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  • Polyacetal resin composition and preparation method thereof
  • Polyacetal resin composition and preparation method thereof
  • Polyacetal resin composition and preparation method thereof

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preparation example Construction

[0046] The present invention also provides a kind of preparation method of polyacetal composition, comprises the following steps:

[0047] 100 parts of polyacetal resin, 0.001-2.0 parts of antioxidant, 0.005-3.0 parts of formaldehyde absorbent, 0.002-2.0 parts of acid absorbent, 0.001-2.0 parts of processing stabilizer, 0.1-20 parts of modified inorganic filler, 0.005 ~2.0 parts of dispersant are melted and kneaded to obtain a polyacetal composition; the dispersant is mineral oil, oligoolefin, C12-C20 fatty acid, dimethyl polysiloxane and hydrogen, phenyl, halogenated One or more of the dimethyl polysiloxanes obtained by substituting methyl groups with phenyl groups, haloalkyl groups, and fluoroester groups;

[0048] The modified inorganic filler is obtained by modifying the inorganic filler and a modifier under the conditions of a rotating speed of 500-10,000 rpm and a temperature of 10-100°C.

[0049] According to the present invention, after mixing various raw materials, t...

Embodiment 1

[0058] 100 parts by weight of paraformaldehyde and 3.5 parts by weight of 1,3-dioxolane as comonomer in BF 3 - Polymerize in the presence of an ether catalyst, use methylal as a chain transfer agent, then deactivate the catalyst with a triethylamine solution to obtain a polyoxymethylene copolymer, and the melt index of its melt (measured at 190 ° C under 2.16 kg) is 2.0-30.0g / 10min.

Embodiment 2

[0060] The modification speed is 3000 rpm, the modification temperature is 50° C., and the addition amount of isopropyl tris(dodecylbenzenesulfonyl) titanate is 2.0% of the weight of calcium carbonate to obtain modified calcium carbonate.

[0061] Add 0.4 parts by weight of tetrakis [methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester to 100 parts by weight of polyoxymethylene polymer prepared in Preparation Example 1, 0.2 The melamine of weight part, the calcium stearate of 0.1 weight part, 0.2 weight part of pentaerythritol stearate, 5 weight parts of above-mentioned modified calcium carbonates, 0.5 weight part of dimethyl siloxane, fully mix, then at 10KPa reduce Under pressure conditions, at 210°C, use a twin-screw extruder with a vent port to melt and mix for 0.5 minutes, then pelletize and shape, and dry the pellets at 140°C for 3 hours to obtain a stabilized polyacetal composition.

[0062] figure 1 For the polarized picture of the polyacetal...

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Abstract

The invention provides a polyacetal resin composition, which comprises the following components: 100 parts of polyacetal resin, 0.001-2.0 parts of antioxygen, 0.005-3.0 parts of formaldehyde absorbent, 0.002-2.0 parts of acid absorbent, 0.001-2.0 parts of processing stabilizer, 0.1-20 parts of modified inorganic filler, and 0.005-2.0 parts of dispersant, wherein the dispersant is one or more of mineral oil, oligomerization polyolefin, fatty acid of C12-C20, dimethyl polysiloxane and dimethyl polysiloxane obtained by using hydrogen, phenyl, halogenated phenyl, halogenated alkyl and fluorinated ester to replace methyl; and the modified inorganic filler is obtained by modifying an inorganic filler and a modifier at 10-100 DEG C at the rotation speed of 500-10000 rpm. On the premise of increasing the tensile strength, the toughness of the polyacetal resin composition is obviously increased; and furthermore, the notch impact strength and the breaking elongation are higher.

Description

technical field [0001] The invention relates to the field of resin products, in particular to a polyacetal resin composition and a preparation method thereof. Background technique [0002] Polyacetal resin is a highly crystalline thermoplastic polymer with wear-resistant self-lubricating properties, oil resistance, chemical resistance, creep resistance and low water absorption. It can be used in a wide temperature range and has high Excellent mechanical, chemical properties and electrical performance retention, are widely used in industries such as automobiles, electronic appliances, household appliances, precision machinery and building materials. [0003] However, due to the poor toughness of polyacetal resin, especially the sensitivity to notch, the notched impact strength is low, which greatly limits its application. The publication number is CN1025862C. A grafted or cross-linked copolymer, a lubricant and an inorganic powder with an average particle diameter of 50 μm o...

Claims

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Application Information

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IPC IPC(8): C08L59/00C08K13/06C08K9/04C08K9/06C08K3/22C08K3/30C08K3/36C08K3/26C08K3/34C08K3/16C08K5/01C08K5/09
Inventor 刘海春叶兴福李子林韩义张红伟樊钹普雪涛
Owner YUNNAN YUNTIANHUA
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