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Preparation method of cast nylon 6 polydimethylsiloxane copolymer

A technology of ester-based polydimethylsiloxane and dimethylsiloxane, which is applied in the field of preparation of cast nylon 6 polydimethylsiloxane copolymer, which can solve the loss of modifier loss and uneven material and other problems, to achieve the effect of reducing water absorption, good modification effect, and short production cycle

Pending Publication Date: 2021-01-22
扬州倍尔特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The additive modification method is simple and easy to implement, but the modifier may have the problem of uneven material caused by sedimentation, and the modifier may be gradually lost during use

Method used

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  • Preparation method of cast nylon 6 polydimethylsiloxane copolymer
  • Preparation method of cast nylon 6 polydimethylsiloxane copolymer
  • Preparation method of cast nylon 6 polydimethylsiloxane copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of isocyanate-terminated polydimethylsiloxane: Under nitrogen protection, take 10 g of dieugenol-terminated polydimethylsiloxane into the reactor, heat to 60°C, and follow the dieugenol-terminated polydimethylsiloxane The molar ratio of polydimethylsiloxane to toluene diisocyanate (a mixture of 80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate) was 1:2. Add toluene diisocyanate and stir for 3 hours. The product was protected under nitrogen and stored in cold storage for future use.

[0027] 2. Preparation of nylon 6 polydimethylsiloxane copolymer by casting method: add 100g of caprolactam monomer into the reactor, heat it at 82°C to melt it, and raise the temperature to 132°C, vacuum dehydration for 40min; release the vacuum, according to Add sodium hydroxide at a molar ratio of caprolactam to sodium hydroxide of 100:0.4, dehydrate under vacuum at 132°C for 30 minutes; release the vacuum, add isocyanate-terminated polydimethylsiloxane at a mol...

Embodiment 2

[0029] 1. Preparation of isocyanate-terminated polydimethylsiloxane: Under nitrogen protection, take 15g of dieugenol-terminated polydimethylsiloxane into the reactor, heat to 65°C, and follow the dieugenol-terminated polydimethylsiloxane The molar ratio of polydimethylsiloxane to toluene diisocyanate (a mixture of 80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate) is 1:2.1. Add toluene diisocyanate and stir for 2.5 hours . The product was protected under nitrogen and stored in cold storage for future use.

[0030] 2. Preparation of nylon 6 polydimethylsiloxane copolymer by casting molding method: add 150g caprolactam monomer into the reactor, heat it at 88°C to melt it, and raise the temperature to 136°C, vacuum dehydration for 30min; release the vacuum, according to Add sodium hydroxide at a molar ratio of caprolactam to sodium hydroxide of 100:0.6, dehydrate in vacuum at 136°C for 25 minutes; release the vacuum, add isocyanate-terminated polydimethylsiloxane at...

Embodiment 3

[0032] 1. Preparation of isocyanate-terminated polydimethylsiloxane: Under the protection of nitrogen, take 18g of dieugenol-terminated polydimethylsiloxane into the reactor, heat to 70°C, and follow the dieugenol-terminated polydimethylsiloxane The molar ratio of polydimethylsiloxane to toluene diisocyanate (a mixture of 80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate) was 1:2.2. Add toluene diisocyanate and stir for 2 hours. The product was protected under nitrogen and stored in cold storage for future use.

[0033] 2. Preparation of nylon 6 polydimethylsiloxane copolymer by casting method: add 200g of caprolactam monomer into the reactor, heat it at 90°C to melt it, and raise the temperature to 135°C, vacuum dehydration for 35min; release the vacuum, according to Add sodium hydroxide at a molar ratio of caprolactam to sodium hydroxide of 100:0.5, dehydrate under vacuum at 135°C for 35 minutes; release the vacuum, and add isocyanate-terminated polydimethylsilox...

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Abstract

The invention belongs to the technical field of engineering plastic modification, and particularly relates to a preparation method of a cast nylon 6 polydimethylsiloxane copolymer. The preparation method comprises the following steps: synthesizing isocyanate-terminated polydimethylsiloxane by taking bis-eugenol terminated polydimethylsiloxane and toluene diisocynate as raw materials; in an caprolactam base catalyzed anionic polymerization process, using isocyanate-terminated polydimethylsiloxane to replace a traditional activating agent, and preparing the nylon 6 polydimethylsiloxane copolymerthrough a casting molding method. According to the prepared cast nylon 6 polydimethylsiloxane copolymer, functional groups are combined with nylon 6 through chemical bonds, so that compared with a cast nylon material prepared from an additive modifier, the problem that the material is uneven due to sedimentation of the additive modifier and the problem that the modifier is possibly lost continuously in the using process are avoided; the modification effect is better, and the influence on the mechanical property is smaller.

Description

technical field [0001] The invention relates to the technical field of modification of engineering plastics, in particular to a method for preparing a cast nylon 6 polydimethylsiloxane copolymer. Background technique [0002] Monomer cast nylon, also known as cast nylon 6, is a product formed by direct polymerization of caprolactam monomers in the mold by alkali-catalyzed polymerization (anionic polymerization), and the polymerization and molding are completed at the same time. The molecular weight of cast nylon 6 is about twice that of ordinary nylon 6, and its physical and mechanical properties are better than ordinary nylon. It has better strength, rigidity, toughness, wear resistance, chemical stability and dimensional stability. At present, cast nylon is widely used in machinery, automobile, mining, textile, petrochemical and other fields, and gradually replaces copper, aluminum, steel and other metal materials. Pure cast nylon 6 still has disadvantages such as poor lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/42
CPCC08G69/42
Inventor 张春红张爱臣张亮凌凌
Owner 扬州倍尔特新材料有限公司
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