A kind of cyano-modified organosilicon synthetic leather coating preparation method

A technology of organosilicon synthetic leather and modification, applied in textiles and papermaking, etc., can solve the problems such as swelling or peeling of organosilicon synthetic leather coating, low surface tension, deterioration of leather performance, etc., to improve adhesion and surface Recoatability, effect of reducing swelling or peeling, improving solvent resistance

Active Publication Date: 2021-09-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although silicone materials have many advantages, due to the small content of polar groups and the shielding effect of a large number of methyl groups on the side chains of polysiloxane, the intermolecular interaction is very weak, so the low polarity ( Low surface tension) When silicone is used as leather, synthetic leather, textile coating, it often shows problems such as insufficient adhesion to polar substrates, poor surface recoatability and poor solvent resistance.
Poor recoatability shows that coatings such as silicone synthetic leather are difficult to be wetted and spread by surface treatment agents in surface treatment processes such as gloss enhancement, matting, printing and color change, which is not conducive to the diversification of product appearance and style; poor adhesion The performance is that the silicone coating is difficult to bond to the base cloth / material, and the peel strength is low. For example, when the shoe leather is made into a product, the adhesion to the sole material is low; the silicone synthetic leather coating with poor solvent resistance is easy to Swelling or peeling occurs, resulting in reduced leather properties
These problems limit the further popularization and application of silicone coating materials in fields such as synthetic leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of cyano-modified hydrogen-containing polysiloxane: Add 20 parts of hydrogen-containing polysiloxane with a hydrogen content of 1.0%, and 1 part of acrylonitrile into the reactor, and control C=C and Si The molar ratio of -H is 0.5, the temperature is raised to 85 ℃, and 0.3 parts of platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex and 0.1 part of phenothiazine are added , react at 85°C for 4 h. After the remaining Si-H groups are reacted to the theoretical value by bromoacetic acid titration, the cyano-modified hydrogen-containing polysiloxane is prepared and sealed for future use;

[0022] (2) Preparation of cyano-modified organosilicon synthetic leather coating: add 1 part of cyano-modified hydrogen-containing polysiloxane prepared in (1) to a vinyl content of 0.12% double bond-capped In a mixed solution of 20 parts of vinyl polysiloxane, 1 part of platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane and 0.1 part of ethynyl cyclohexanol, carr...

Embodiment 2

[0025] (1) Preparation of cyano-modified hydrogen-containing polysiloxane: Add 10 parts of hydrogen-containing polysiloxane with a hydrogen content of 1.2%, and 2 parts of 3-butenenitrile into the reactor, and control C= The molar ratio of C and Si-H is 0.6, the temperature is raised to 80 ℃, and 0.6 parts of platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex and p-phenylene 0.2 part of diphenol, reacted at 80 ℃ for 3.5 h. After the remaining Si-H groups are reacted to the theoretical value by bromoacetic acid titration, the cyano-modified hydrogen-containing polysiloxane is prepared and sealed for future use;

[0026] (2) Preparation of cyano-modified silicone synthetic leather coating: add 1 part of cyano-modified hydrogen-containing polysiloxane prepared in (1) to a vinyl content of 0.28% double bond capping In a mixed solution of 11 parts of vinyl polysiloxane, 1 part of platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane and 0.2 parts of methyl butynol, carry out ...

Embodiment 3

[0029] (1) Preparation of cyano-modified hydrogen-containing polysiloxane: 10 parts of hydrogen-containing polysiloxane with a hydrogen content of 1.6%, 3,7-dimethyl-6-octenenitrile and 3- Each 1.5 parts of crotononitrile was added into the reactor, the molar ratio of C=C and Si-H was controlled to be 0.8, the temperature was raised to 75°C, and chloroplatinic acid (H 2 PtCI 6 ·6H2 O) 0.6 parts of isopropanol solution and 0.2 parts of hydroxyanisole were reacted at 75 °C for 3 h. After the remaining Si-H groups are reacted to the theoretical value by bromoacetic acid titration, the cyano-modified hydrogen-containing polysiloxane is prepared and sealed for future use;

[0030] (2) Preparation of cyano-modified silicone synthetic leather coating: Add 5 parts of cyano-modified hydrogen-containing polysiloxane prepared in (1) to polyvinyl polyvinyl with a vinyl content of 1.8%. 10 parts of polysiloxane, chloroplatinic acid (H 2 PtCI 6 ·6H 2 O) In a mixture of 2 parts of isopr...

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Abstract

The invention discloses a preparation method of a cyano-modified organic silicon synthetic leather coating. Using the coordination addition reaction of active hydrogen in hydrogen-containing polysiloxane (hydrogen-containing silicone oil) and the double bond in vinyl nitrile monomer, a hydrogen-containing silicone oil with a polar cyano group in the side chain was synthesized, and then it was synthesized Covalently introduced into the silicone synthetic leather coating, effectively improving the surface tension, recoatability, adhesion and solvent resistance of the silicone synthetic leather coating. In addition, the modified silicone coating proposed by the present invention does not use any organic solvents in the preparation process, which can realize the clean production process, meet the green and health needs of consumers and the development trend of the industry, and is suitable for leather, synthetic leather, Textile coatings and coatings and bonding of low-energy surfaces are of guiding significance.

Description

technical field [0001] The invention relates to a method for preparing a cyano-modified organic silicon synthetic leather coating, which belongs to the technical field of organic silicon materials. Background technique [0002] Silicon is the most abundant element in the earth's crust and does not depend on petrochemical resources. As an environmentally friendly material, silicone has excellent properties such as non-toxic, environmental protection, weather resistance, waterproof, wear resistance and physiological inertia. It is widely used in leather / synthetic leather finishing, automotive polishing, commodity chemicals and textile industries. With the development of silicone industry and manufacturing technology, silicone has gradually entered the coating fields of leather / synthetic leather and textile as a coating material. [0003] Chinese patent CN108221396B discloses a healthy and safe silicone rubber leather and its coating process. The raw materials include silicone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/12D06N3/00
CPCD06N3/0061D06N3/128D06N2209/143D06N2209/1664D06N2211/28
Inventor 范浩军王文凯孙哲李静陈意颜俊向均文嘉婷
Owner SICHUAN UNIV
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