Chloride salt stress corrosion cracking resistant polyamide composition and preparation method therefor and application thereof

A technology of stress corrosion cracking and polyamide composition, which is applied in the field of polyamide materials, can solve the problems of polyamide that have not been mentioned, the resistance to calcium chloride stress cracking cannot meet the use requirements, and the resistance to stress corrosion cracking of chloride salts. , to achieve the effect of low cost, low processing temperature and no pollution to the environment

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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN102834463A (application number 201180017841.8) discloses the use of a polyamide resistant to corrosion and stress cracking, which contains a polyamide with a methylene number of 4-6 and a monomer component with methylene and amide groups The polyamide with a ratio of 7-12 is used to further improve the stress cracking resistance of calcium chloride through other additives, but the stress cracking resistance of calcium chloride of the above polyamide materials still cannot meet the requirements of use
Radiation crosslinking technology is widely used in polyamide flame retardant and anti-dripping, but the application of polyamide resistance to chloride salt stress corrosion cracking has not been mentioned

Method used

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  • Chloride salt stress corrosion cracking resistant polyamide composition and preparation method therefor and application thereof
  • Chloride salt stress corrosion cracking resistant polyamide composition and preparation method therefor and application thereof
  • Chloride salt stress corrosion cracking resistant polyamide composition and preparation method therefor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2 and comparative example 1-2

[0053] Table 1 lists the compositions of Examples 1-3 and Comparative Examples 1-2 and their anti-SSCC properties. These examples show that the SSCC resistance performance of the splines is significantly improved after radiation crosslinking treatment, especially the short carbon chain PA66 in Example 1 can obtain SSCC resistance equivalent to that of the long carbon chain PA612 in Comparative Example 2 after radiation crosslinking.

[0054] Table 1

[0055]

Embodiment 3-5 and comparative example 3-4

[0057] Table 2 lists the compositions of Examples 3-5 and Comparative Examples 3-4 and their SSCC resistance properties. It can be seen from Example 4 and Comparative Examples 3-4 that under the same weight percentage of the crosslinking agent, the crosslinking efficiency of PDM is higher than that of TAIC and TAC, so its corresponding anti-SSCC performance is more significant.

[0058] Table 2

[0059]

[0060]

Embodiment 6-8 and comparative example 5

[0062] Table 3 lists the compositions of Examples 6-8 and Comparative Example 5 and their SSCC resistance. Compared with Comparative Example 5 without adding HS01, Examples 6-8 show stable SSCC resistance, especially at a higher radiation dose (150KGγ), HS01 has a more obvious radiation stabilizing effect, and after 30 days of salt stress corrosion After the second cycle processing, the spline does not break.

[0063] table 3

[0064]

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Abstract

The invention discloses a chloride salt stress corrosion cracking resistant polyamide composition and a preparation method therefor and application thereof. The chloride salt stress corrosion cracking resistant polyamide composition is prepared from the following raw materials in percentage by weight: 45-90% of polyamide resin, 5-50% of glass fiber, 0.1-2% of radiation stabilizer, 0.5-5% of cross-linking agent, 0.1-1% of antioxidant and 0.1-5% of auxiliaries. According to the invention, the salt stress corrosion cracking resisting capacity of polyamide, particularly, short-carbon-chain polyamide is further improved by a radiation cross-linking technology, so that cracking protection for polyamide type automobile components and parts during contacting with chloride salt snow melting agents is realized. According to the method disclosed by the invention, the chloride salt stress corrosion cracking resistant polyamide composition is prepared through a twin-screw extruder, can be used for preparing chloride salt stress corrosion cracking resistant products, has good chloride salt stress corrosion cracking resisting capacity and has a broad application prospect.

Description

technical field [0001] The invention relates to the field of polyamide materials, in particular to a polyamide composition resistant to chloride salt stress corrosion cracking, a preparation method and application thereof. Background technique [0002] The polyamide resin represented by PA6 and PA66 is a partially crystalline polymer containing a large number of polar amide groups in the molecular chain, which has good mechanical properties, oil resistance, heat resistance, wear resistance, self-lubrication and Formability, widely used in automobiles, electronic appliances, packaging materials, machinery and other fields. However, nylon has high water absorption and poor dimensional stability, especially salt-induced stress corrosion cracking (SSCC), which can cause cracking and premature failure of components. For example, in cold regions, a large amount of deicing agent (mainly composed of chloride salt , such as sodium chloride or calcium chloride) to prevent road icing,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08L91/06C08K13/04C08K7/14C08K5/3492C08K5/3415B29C71/04
CPCB29C71/04C08K2201/003C08L77/06C08L2205/025C08L2205/03C08L91/06C08K13/04C08K7/14C08K5/34924C08K5/3415
Inventor 林立黄志杰田际波陈佰全
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