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Poly siloxane leather coating material and its preparation method

A technology of polysiloxane and polysiloxane emulsion, which is applied in coatings, textiles and papermaking, etc., can solve the problems of difficult stirring operation, easy migration, large amount of emulsifier, etc., and achieve simple process flow and less pollution The effect of substance generation and less emulsifying dosage

Inactive Publication Date: 2005-11-09
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares amino-modified polysiloxane emulsion. On the one hand, the amount of emulsifier is large, which increases the hydrophilicity of the coating and reduces the waterproof, antifouling performance and wet rubbing fastness of the coating. In addition, the molecular weight of the polymer When it is high, it is difficult to operate bulk polymerization and stirring, and it is easy to produce gel. Therefore, the amino-modified polysiloxane emulsion prepared by the two-step method has limited molecular weight and is prone to migration.

Method used

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  • Poly siloxane leather coating material and its preparation method
  • Poly siloxane leather coating material and its preparation method
  • Poly siloxane leather coating material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of component A: 6 grams of dodecylbenzenesulfonic acid (DBSA), 4 grams of sodium dodecylbenzenesulfonate (SDBS), 1.0 grams of anionic compound emulsifier OP-10, D 4 Add 60 grams and 180 grams of water into the reactor of the stirrer, raise the temperature, when the temperature rises to 80 ° C, keep it warm for 1 hour, add N-(β-aminoethyl)-γ-aminopropyltriethoxysilane 2.5 gram, keep warm for 4 hours, cool down to 50°C, keep warm for 5 hours, adjust the pH value to 6.5-7.5, and make an amino-modified polysiloxane emulsion with a solid content of about 28.8%.

[0054] Preparation of component B: add 30 grams of polyether glycol with a number average molecular weight of 1500, 10 grams of polyether glycol with a number average molecular weight of 400, and 0.2 grams of dibutyltin dilaurate into a reactor with a stirrer, Introduce dry nitrogen protection, start the agitator, add 18 grams of TDI dropwise with a constant pressure dropping funnel, and then raise the t...

Embodiment 2

[0057] Preparation of component A: 7 grams of DBSA, 3 grams of SDBS, 1 gram of TX-10, D 4 , 50 grams, and 180 grams of water, mix and add in the reactor with agitator, heat up while stirring, when the temperature rises to 90 ° C, keep warm for 6 hours, add N-(β-aminoethyl)-γ-aminopropyl dropwise 2.2 g of methyldiethoxymethylsilane, heat preservation for 4 hours, lower the temperature to 50°C, heat preservation for 3 hours, adjust the pH value to 6.5-7.5, and prepare an amino-modified polysiloxane emulsion with a solid content of about 22%.

[0058] Preparation of component B: Add 25 grams of polyether diol with a number average molecular weight of 1000 and 15 grams of polyether diol with a number average molecular weight of 1500 into a reactor with a stirrer, and feed Dry under nitrogen protection, start the stirrer, add 16 grams of TDI dropwise with quantitative addition, and then raise the temperature to 80 ° C, after the heat preservation reaction for 5 hours, add 5 grams o...

Embodiment 3

[0061] A component prepared DBSA 6.5 grams, SDBS 2.0 grams, AEO-10 ​​1.5 grams, D 4 , 50 grams of mixed solution, 1 / 3 of the mixed solution and 200 grams of water were added to a reactor with a stirrer, stirred for 30 minutes, emulsified, heated to 60°C while stirring, and then the remaining 2 / 3 mixed solution was added dropwise for 2 hours After the internal addition is completed, continue to keep warm for 5 hours, add 2 grams of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane dropwise, keep warm for 5 hours, adjust the pH value to 6.5-7.5, and obtain a solid content of about It is a 23.6% amino-modified polysiloxane emulsion.

[0062] Preparation of component B: Add 15 grams of polyether diols with a number average molecular weight of 400, 25 grams of polyether diols with a number average molecular weight of 2000, and 0.1 grams of catalyst into a reactor with a stirrer, and pass into Dry under nitrogen protection, start the stirrer, add 17 grams of TDI dropwise, and then rai...

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Abstract

The invention discloses a polysiloxane leather coating material, prepared of the below components: component A polysiloxane latex, wherein amine value of polysiloxane is 0.21-0.53, viscosity average molecular weight is 25,000-73,000, and solid content is 18-35%; component B polysiloxane-polyurethane copolymerized latex, wherein solid content is 18-35%; the weight ratio of components A to B is 2:1 to 5:1. The invention discloses a process method for preparing this painting material. After used, this painting material of the invention gives a leather warm high smoothness, thickness, silk-like soft handling and has good permanence; the process method of the invention has simple process flow, uses small amount of emulsifier and produces less pollutants.

Description

technical field [0001] The invention relates to a polysiloxane modification and compounding technology, in particular to a polysiloxane material used for leather surface finishing and a preparation method thereof. Background technique [0002] Since its appearance in the 1940s, organosilicon has been widely used in electronics, transportation, Aerospace, construction, textile, paper, leather, daily chemical and other industrial sectors. [0003] In the past ten years, one of the hot spots in the development and research of organic silicon products has been set off at home and abroad, and the leather industry is no exception, especially the famous foreign companies such as Dow Corning, Rohm and Haas, BASF, Bayer, Clariant, Henkel, Holland Stahl and other companies have successfully developed a series of multifunctional silicone leather special products, including silicone water repellent, soft fatliquoring agent, and finishing agent. The advantages of less quantity and obvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/12
Inventor 朱春凤
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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