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Side amino polysiloxane-modified polyurethane coating agent

A technology of pendant amino polysiloxane and polyurethane coating, which is applied in the field of pendant amino polysiloxane modified polyurethane coating agent, to achieve the effect of improving moisture permeability and strong promotion value

Inactive Publication Date: 2018-05-29
韩会义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polysiloxane has the characteristics of breathability, high and low temperature resistance, and smooth and soft handle of the finished fabric. In recent years, it has been widely used to modify polyurethane. There are many related literatures to improve the air permeability, weather resistance, biocompatibility and surface of polyurethane. Hand feel is the research direction, and research on improving waterproof and moisture permeability performance is relatively rare

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0012] The raw materials for the preparation of side amino polysiloxane modified polyurethane coating agent are as follows: polytetrahydrofuran ether (PTMG, Mn=2000), industrial grade; polyethylene glycol (PEG, Mn=1000), analytically pure; β-aminoethylene γ-aminopropyl polydimethylsiloxane (APDMS5), Mn=5000, ammonia value 0.8mmol·g −1 , self-made; isophorone diisocyanate (IPDI), industrial grade; dimethylolpropionic acid (DMPA), industrial grade, vacuum dewatered at 100°C for 5 hours before use; dibutyltin dilaurate, analytically pure; 1, 4-Butanediol (BDO), analytically pure, soaked with 4A molecular sieve for 7 days before use; butanone (MEK), analytically pure, soaked with 4A molecular sieve for 7 days before use. TF-601 thickener and polyester spinning fabric; potassium hydroxide (KOH), methanol, propionic acid, triethylamine (TEA). The preparation steps of the side amino polysiloxane modified polyurethane coating agent are as follows: put the metered PTMG and PEG in a fo...

Embodiment example 2

[0014] Infrared spectroscopy (FTIR) analysis: Using Nicolet8700 Fourier transform infrared spectrometer, the purified polyurethane prepolymer was coated on the KBr crystal window, and the test was carried out after the solvent evaporated. Result: 3326cm −1 It is the characteristic absorption peak of NH bond stretching vibration and bending vibration in urethane bond; 2945cm −1 The nearby absorption peak is attributed to the stretching vibration of CH in methyl and methylene; 1710cm −1 It is the characteristic absorption peak of CO stretching vibration in urethane bond; 1118cm −1 Attributed to the stretching vibration characteristic peak of COC in PTMG, at the same time at 1042cm −1 There is a characteristic peak attributed to the SiOSi stretching vibration in SAPDMS nearby. Since it overlaps with the absorption peak of polyether polyol near this area, the peak shape changes slightly. In addition, at 803cm −1 A characteristic absorption peak attributable to the symmetrical d...

Embodiment example 3

[0016] Determination of emulsion particle size and zeta potential: use ZS90 nanometer particle size and zeta potential analyzer, dilute WSSPU emulsion to 1%, and test at 25°C. Results: The particle size of WSSPU emulsion added with SAPDMS is larger than that of WSSPU0. With the increase of SAPDMS content, the particle size distribution becomes wider (parameter PDI increases); the absolute value of zeta potential is greater than 30mV, and the aqueous dispersion is stable. of. When the content of SAPDMS was 18%, floating matter appeared in the emulsion, and the stability of the emulsion became poor.

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Abstract

A side amino polysiloxane-modified polyurethane coating agent is disclosed. Side aminopolysiloxane (SAPDMS), polytetrahydrofuran glycol and polyethylene glycol as mixed soft segments, dimethylol propionic acid as a hydrophilic chain extender, and 1,4-butanediol as a hard segment regulator are reacted with isophorone diisocyanate to synthesize a waterborne silicone modified polyurethane (WSSPU), and the waterproof and moisture-permeable fabric coating agent is prepared based on the WSSPU. The composition and microstructure of a WSSPU film can be characterized by an infrared spectroscopy, a differential scanning calorimeter, a dynamic mechanical analyzer, a positron annihilation lifetime spectroscopy, and the like. The mechanical properties of the WSSPU film and the waterproof and moisture-permeable properties of a coated fabric are investigated. Results show that a stable emulsion can be obtained when the dosage of the side aminopolysiloxane (mass ratio) is less than 15%. After polysiloxane modification, the internal micro-phase separation structure of the film is more obvious, the free volume cavity becomes larger, and the moisture-permeable properties are improved.

Description

technical field [0001] The invention relates to a coating agent, in particular to a side amino polysiloxane modified polyurethane coating agent. Background technique [0002] Waterproof and moisture-permeable coated fabrics, usually also called waterproof breathable fabrics or breathable fabrics, mean that water under a certain pressure cannot pass through the fabrics, that is, the fabrics can prevent rainwater and other liquids from penetrating, but the sweat vapor emitted by human movement can pass through the fabrics Diffusion or conduction to the outside world, will not accumulate between the body surface and the fabric, and will not make people feel stuffy. Polyurethane coatings have a certain waterproof and moisture permeability, but with the continuous improvement of people's needs, traditional polyurethane coating agents can no longer meet market demand. Therefore, there are increasing researches on adjusting the structure or processing technology of polyurethane to...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/61C08G18/34C08G18/32C08G18/12D06M15/653D06M101/32
CPCC08G18/755C08G18/0823C08G18/12C08G18/4009C08G18/4804C08G18/4833C08G18/4854C08G18/61C08G18/6674C08G18/6692D06M15/653D06M2101/32D06M2200/12
Inventor 韩会义
Owner 韩会义
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