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Toughening polyamide combination and prepn method

A technology for toughening polyamides and compositions, which is applied in the field of toughened polyamides and its preparation, and can solve the problems of poor performance of toughened polyamides, reduced rigidity of toughened polyamides, and unstable particle size of elastomer dispersed phases. Achieve good toughness and processability, good balance between toughness and toughness, high strength and rigidity

Inactive Publication Date: 2004-03-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of elastomer grafting is relatively high, and the blending of this grafted elastomer with polyamide also has the following disadvantages: (1) under the current blending conditions of rubber and plastic processing, the elastomer as the dispersed phase Particle size is difficult to control in a small range, generally the average particle diameter of elastomers is greater than 200nm
To achieve brittle-ductile transition, a larger portion of elastomer is required, resulting in a decrease in the rigidity of the toughened polyamide; (2) The particle size of the dispersed phase of the elastomer is unstable, with the shear rate and other factors in the process The particle size of the dispersed phase of the elastomer in the toughened polyamide has been changing; (3) the particle size of the dispersed phase of the elastomer is very uneven; (4) the content of the elastomer should not exceed 40%, otherwise it is easy to appear "sea- "sea" phase structure, and even phase inversion, which makes the performance of toughened polyamide worse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0026] Fully vulcanized carboxylated styrene-butadiene powder rubber (in the XSBRL-54B1 carboxylated styrene-butadiene emulsion produced by Yanshan Petrochemical Co., Ltd., mixed with the cross-linking aid isooctyl acrylate by 3% of the weight of the carboxylated styrene-butadiene emulsion dry rubber, and then irradiated Vulcanization, irradiation dose is 2.5Mrad, obtained by spray drying, average particle size is 150nm, gel content is 92.6%), POE grafted with glycidyl methacrylate (POE-g-GMA, self-made, grafting rate 4.6%) and Nylon 6 (brand name 1013B of Japan Ube Industries Co., Ltd.), calcium stearate (chemically pure produced by Beijing Changyanghua Factory), and sodium stearate (chemically pure produced by Beijing Changyanghua Factory). The ZSK-25 twin-screw extruder of German WP Company was used for blending and granulation, and the temperatures of each section of the extruder were: 230°C, 235°C, 240°C, 245°C, 240°C and 235°C (head temperature). The specific formula is ...

Embodiment 7

[0034] The fully vulcanized carboxylated styrene-butadiene powder rubber in embodiment 1 is replaced by fully vulcanized acrylate powder rubber (in the acrylate latex of the brand BC-01 produced by Beijing Dongfang Chemical Factory, add 3% by acrylate emulsion dry glue weight Isooctyl acrylate is irradiated and vulcanized, and the irradiation dose is 2.5Mrad, obtained through spray drying, the average particle diameter is 100nm, and the gel content is 85.7%), and the remaining conditions are the same as in Example 1. The specific formula, test standard and performance results are shown in Table 3.

[0035] implement

Embodiment 8

[0037] The fully vulcanized carboxylated styrene butadiene powder rubber in embodiment 1 is replaced with fully vulcanized carboxylated nitrile butadiene powder rubber (in the carboxylated nitrile butadiene emulsion of XNBRL produced by Lanhua Latex Research and Development Center, press carboxylated nitrile butadiene emulsion dry rubber quality After adding the cross-linking auxiliary trimethylolpropane triacrylate at 3%, irradiation vulcanization is carried out, the irradiation dose is 10 Mrad, obtained after spray drying, the gel content is 97.1% by weight), and the other conditions are the same as in Example 1. The specific formula, test standard and performance results are shown in Table 3.

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PUM

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Abstract

A toughened polyamide composition is prepared from polyamide and the rubber composition containing of powdered (not greater than 0.3 microns) rubber with cross-linking structure and at least one of unsulfurized rubber, thermoplastic elastomer and the thermoplastic elastomer grafted with polar monomer. Its advantages are controllable form and particle diameter, better toughness and machinability, and good strength and rigidity.

Description

technical field [0001] The present invention relates to toughened plastics, in particular, the invention relates to toughened polyamides and methods for their preparation. Background technique [0002] Polyamide is a kind of engineering plastic with excellent comprehensive performance, which is widely used. However, in many cases, especially at lower temperatures, its low-temperature impact performance is low, so toughening modification is required. In the prior art, polyamides are usually toughened with elastomers. The elastomers used are generally olefin copolymers, such as ethylene propylene rubber, SBS, etc. However, due to the poor compatibility of such elastomers with polyamides, the compatibility must be improved by grafting elastomers with carboxylic acid or anhydride. At present, it is mainly modified with maleic anhydride. For example, the PA alloy Zyte1801 of Dupont Company of the United States and the similar products sold by Toray Co., Ltd. of Japan under th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00C08L77/00
Inventor 张师军乔金梁张薇邵静波尹华张晓红段淑清刘轶群吕明福李魁
Owner CHINA PETROLEUM & CHEM CORP
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