Method for producing polyurethane toughness-reinforcing cast form nylon composite material

A technology for casting nylon and composite materials, which is applied in the field of preparation of polyurethane toughened casting nylon composite materials, can solve problems such as easy brittle cracking, large brittleness, and application field limitations, and achieve high mechanical strength, improved mechanical strength, friction The effect of improving the chemical properties and antistatic properties

Inactive Publication Date: 2009-08-12
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, its high crystallinity makes the material more brittle, especially under low temperature conditions, which limits its application field to a certain extent.

Method used

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  • Method for producing polyurethane toughness-reinforcing cast form nylon composite material

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Embodiment 1

[0016] (1) Preparation of isocyanate-terminated polyurethane prepolymer:

[0017] A) Weigh 100 parts of polytetrahydrofuran ether (abbreviated as PTMG) in parts by mass (hereinafter all in parts by mass), and dehydrate at 100°C-150°C and 0.01-0.1Pa pressure for 30-60min. Get the processed polyether, standby;

[0018] B) 16 parts of toluene diisocyanate (abbreviated as TDI) are weighed for subsequent use;

[0019] C) Heating the treated PTMG to 70° C., adding metered TDI to carry out polymerization reaction, and reacting for 120-240 minutes to obtain an isocyanate-terminated polyurethane prepolymer with a free isocyanate content of 3%. spare;

[0020] (2) Weigh 200 parts of caprolactam monomer, divide one-half into a container and heat to about 120°C to melt the material, vacuumize and dehydrate until no water flows out, and the vacuum degree is 10 -1 ~10 -3 Pa. spare;

[0021] (3) Mix 100 parts of (2) dehydrated caprolactam liquid with 10 parts of polyurethane prepolymer...

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Abstract

The invention relates to a preparation method of polyurethane plasticizing monomer casting nylon compound material. The material is made through pouring the raw material of polyurethane prepolymer, and caprolactam, etc. The main performance of the material is characterized in that the mechanical strength is improved, the tensile fracture elongation rate is increased along with increasing of the use amount of the polyurethane prepolymer, the impact strength is enhanced along with the increasing of the use amount of the polyurethane prepolymer, and the tribology performance and the antistatic performance are improved remarkably.

Description

technical field [0001] The invention relates to a preparation method of polyurethane toughened cast nylon composite material. Background technique [0002] Cast nylon (that is, MC nylon) is to use the molten caprolactam monomer as a catalyst under normal pressure, together with activators and other additives, directly inject it into the mold preheated to a certain temperature. The polymerization reaction is carried out very quickly in the mold, and it condenses into a tough solid piece. Cast nylon has a high degree of polymerization, high molecular weight and crystallinity, and has better performance than other engineering plastics. It is widely used to manufacture wear-resistant and anti-friction parts, especially for large-scale products that cannot be solved by injection molding and compression molding. In many fields, it is gradually replacing copper, aluminum, steel and other metal materials. However, its high crystallinity makes the material more brittle, especially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08L75/04C08G18/10C08G69/16
Inventor 简令奇潘炳力王宏刚杨生荣
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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