A pure hydrolysis-resistant polyamide composition and its preparation method

A polyamide composition and hydrolysis-resistant technology, which is applied in the field of pure hydrolysis-resistant polyamide composition and its preparation, can solve the problems of inapplicability, easy precipitation of alkali metal antioxidants, failure to provide pure polyamide composition, etc.

Active Publication Date: 2021-07-13
江苏晋伦塑料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the above scheme is that the added alkali metal antioxidant is easy to precipitate, and it is polluting to the water body, so it is not suitable for the field of domestic water
Chinese patent application CN105949763A discloses an environment-friendly hot water stable polyamide composition. Although the method of adding an alkali metal antioxidant is avoided, it needs to be processed by a special process of double vacuum, and the hydrolysis resistance of the announced material is only In the short term, there is still a distance from the long-term goal of hydrolysis resistance
[0004] In summary, the prior art fails to provide a pure polyamide composition that meets the requirements of long-term exposure to hot chlorinated water, and needs further improvement

Method used

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  • A pure hydrolysis-resistant polyamide composition and its preparation method
  • A pure hydrolysis-resistant polyamide composition and its preparation method
  • A pure hydrolysis-resistant polyamide composition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0122] Example 2, Example 3, Comparative Example 1 and Comparative Example 2 show the hydrolysis resistance performance of polyamide 66 with different amino-terminated and carboxyl-terminated contents in hot chlorine water. These examples and comparative examples show that the amino-terminated content of the polyamide substrate increases and the carboxyl-terminated content decreases. PA66-1 is a general-purpose polyamide 66, which has about 50mmol / kg of terminal amino groups and about 80mmol / kg of terminal carboxyl groups. The resin is used as the base material composition. In Comparative Example 1, when no When using functional additives, the test piece cracked after soaking in hot chlorine water at 90°C for 500 hours, and after 1000 hours, the test piece cracked severely and completely lost its function. In comparative example 2, reference examples 2 and 3 added an appropriate amount of functional additives, but the tensile strength retention rate at 500 hours was only 35.1%...

Embodiment 1

[0123] Example 1, Example 4 and Comparative Example 3 show the hydrolysis resistance performance of the composition in hot chlorine water with different glass fiber content and long carbon chain polyamide. These examples and comparative examples show that as the proportion of glass fiber increases, the mechanical properties of the composition maintained in hot water are also better. This is mainly because the glass fiber improves the initial mechanical properties of the composition on the one hand, and reduces improve the water absorption of the composition. The substrate of Comparative Example 3 is all long carbon chain polyamide PA610, which shows excellent hydrolysis resistance. However, the cost of adding excessive long carbon chain polyamide is higher cost and lower initial mechanical properties.

[0124] Comparative Example 4 and Comparative Example 1 show that the hydrolysis resistance of the halide salt stabilizer is improved, and the hydrolysis resistance is significa...

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Abstract

The invention discloses a pure hydrolysis-resistant polyamide composition and a preparation method thereof, comprising: polyamide (A) 40-84.80wt%, glass fiber 15-60.00wt%, ethylene-maleic anhydride copolymer in terms of mass percentage 0.10-0.50wt% and antioxidant (A) 0.10-0.30wt%; Wherein, polyamide (A) is polyhexamethylene adipate, and has terminal amino groups greater than 70mmol / kg or less than 60mmol / kg Carboxyl group; polyamide and functional additives are added to the main feed port of the extruder, and glass fiber is added to the side feed port of the middle section, and the strands are extruded by the screw, pelletized, and dried to obtain pure, long-term heat-resistant chlorine water The polyamide composition has a tensile strength retention of at least 50% after soaking in hot chlorine water (Cl content 5 ppm) at 90°C / 1000 hours.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a pure hydrolysis-resistant polyamide composition and a preparation method thereof. Background technique [0002] In the field of water pipe products and accessories, lead-free is getting more and more attention. Lead pollution will endanger human reproductive ability, kidney function and nervous system. Under the hazards of excessive lead in traditional copper products, new replacement schemes have been attracting the attention of the industry, and high-functional engineering plastics are an important direction. Compared with traditional copper and other metal materials that replace copper, engineering plastics have the advantages of light weight, corrosion resistance, and easy manufacturing. Polyamide materials are the most common choice. [0003] Tap water is generally disinfected by chlorination, so there will be free chlorine. Water pipe products used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08L77/02C08L23/08C08K7/14C08K5/527C08K5/20C08K5/134C08K5/13C08K5/3492C08K5/5393
Inventor 陈跃民陈原振林柏龄
Owner 江苏晋伦塑料科技有限公司
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