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Method for preparing low-temperature high-toughness siloxane copolymerized MC (monomer-cast) nylon by polymerization

A high-toughness, siloxane technology, applied in the field of material science, can solve the problems of low-temperature toughness and poor toughness of styrene, and achieve the effects of improved flame retardancy, excellent flexibility, and high application value

Active Publication Date: 2013-07-24
江苏利德尔新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201010565545.9 adopts the method of polystyrene-g-casting nylon 6 graft copolymerization to prepare toughened nylon, but the toughness of styrene itself is not good, and the low-temperature toughness of the material also needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the first step, heat 10 parts by weight of dihydroxypolysiloxane with a molecular weight of 2000 to 50°C, stir and add 1.8 parts by weight of m-phenylene diisocyanate dropwise, and react at this temperature for 3 hours until the hydroxyl group disappears, forming Polysiloxane macromolecule activator Si-NCO-1000.

[0023] In the second step, 100 parts by weight of caprolactam is heated to 80° C. to melt the material, poured into two reactors on average, heated to 130° C., and vacuum dehydrated for 30 minutes. When the vacuum degree was 10 mmHg, 0.40 parts by weight of sodium hydroxide was added as a catalyst in one of the reactors, and vacuum dehydration was continued for 30 minutes to keep the vacuum degree at 10 mmHg. Add the activator Si-NCO-1000 obtained in the first step into another reactor, stir evenly for 30 minutes, and keep a vacuum of 10 mm Hg.

[0024] The third step is to quickly stir all the materials in the two reactors evenly, then cast them into a mo...

Embodiment 2

[0026] In the first step, heat 15 parts by weight of dihydroxypolysiloxane with a molecular weight of 4000 to 50°C, stir and add 1.35 parts by weight of p-phenylene diisocyanate dropwise, and react at this temperature for 6 hours to form polysiloxane Macromolecular activator Si-NCO-4000.

[0027] In the second step, 100 parts by weight of caprolactam is heated to 80° C. to melt the material, poured into two reactors on average, heated to 130° C., and vacuum dehydrated for 30 minutes. When the vacuum degree is 10 mmHg, add 0.30 parts by weight of sodium hydroxide as a catalyst and 10 parts by weight of carbon fiber in one of the reactors, and continue vacuum dehydration for 30 minutes to keep the degree of vacuum at 10 mmHg. Add the activator Si-NCO-4000 obtained in the first step into another reactor, stir evenly for 30 minutes, and keep a vacuum of 10 mmHg.

[0028] The third step is to quickly stir all the materials in the two reactors evenly, then cast them into a mold pre...

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Abstract

The invention discloses a method for preparing low-temperature high-toughness siloxane copolymerized MC (monomer-cast) nylon by polymerization. The method comprises the steps of: firstly, reacting polyhydroxy siloxane with a multifunctional isocyanate activator to produce a polysiloxane macromolecule activator Si-NCO; respectively vacuum dewatering a caprolactam in two reaction kettles, adding a catalyst in one reaction kettle and continuing vacuum dewatering, while adding the activator Si-NCO in the other reaction kettle and evenly mixing; when the vacuum degrees of the two kettles achieve 10-15mmHg, rapidly mixing materials in the two kettles to even, casting the mixed material in a preheated mould, keeping the temperature for 30 minutes to 1 hour, and removing the mould, thus obtaining the low-temperature high-toughness siloxane copolymerized MC nylon. The notch impact strength of the low-temperature high-toughness siloxane copolymerized MC nylon is 20%-400% higher than that of an unmodified MC nylon prepared under the same conditions, and the tensile strength and the impact strength of the MC nylon at the temperature of minus 40 DEG C can be maintained at 80% those of the MC nylon at the temperature of 25 DEG C. In addition, the flame retardant performance of the MC nylon is improved.

Description

technical field [0001] The invention relates to a synthesis method for preparing low-temperature high-toughness siloxane copolymerized MC nylon by adopting an anion polymerization method, and belongs to the technical field of material science. Background technique [0002] Monomer cast nylon (referred to as MC nylon) is an engineering plastic prepared by anionic polymerization technology of caprolactam in the early 1960s. It is completely different from hydrolyzed nylon in its synthesis mechanism. It is a chain polymerization characterized by anionic polymerization. The reaction can reduce the activation energy of the reaction with the help of an activator, so the polymerization temperature is low (160-190°C), the polymerization yield is high, the reaction speed is fast, the average molecular weight, crystallinity, density are high, mechanical strength, stiffness, wear resistance It is larger than ordinary nylon, has good chemical resistance, low water absorption and good di...

Claims

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Application Information

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IPC IPC(8): C08G69/42C08G18/61
Inventor 费国霞夏和生沈国春张玉蓉马永梅
Owner 江苏利德尔新材料科技有限公司
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