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Water-based polyurethane and its preparation method and water-based polyurethane leather filler

A water-based polyurethane and filler technology, applied in the field of leather, can solve problems such as inability to achieve a good filling effect, lack of good filling performance, and difficulty in grasping the timing of sealing, and achieve excellent bonding strength, excellent filling effect, and good penetration performance effect

Active Publication Date: 2019-02-12
SICHUAN DOWELL SCI & TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the timing of capping is difficult to grasp. When the molecular weight design before capping is small, the obtained filler has better permeability, but the resin itself is too soft and has no good filling performance; when the molecular weight design before capping is large, the mechanical properties of the resin itself The strength is good, and it has good filling performance, but the permeability becomes poor, and the film is formed on the surface of the embryo, which still cannot achieve a good filling effect.

Method used

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  • Water-based polyurethane and its preparation method and water-based polyurethane leather filler
  • Water-based polyurethane and its preparation method and water-based polyurethane leather filler
  • Water-based polyurethane and its preparation method and water-based polyurethane leather filler

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preparation example Construction

[0036] The present invention also provides the preparation method of above-mentioned waterborne polyurethane, comprising:

[0037] A) diisocyanate reacts with dibasic alcohol;

[0038] The diisocyanate is preferably any one of hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 4,4'-dicyclohexylmethane diisocyanate (HMDI) and toluene diisocyanate (TDI). one or several;

[0039] The diol is preferably any one or more of polypropylene glycol, polycaprolactone diol, polycarbonate diol and polytetrahydrofuran ether diol;

[0040] B) using 2,2-dimethylolpropionic acid for chain extension;

[0041] C) Capping with polyethylene glycol monomethyl ether.

[0042] First, diisocyanate is reacted with dibasic alcohol, and the reaction formula is as follows:

[0043]

[0044] The molecular weight of the diol is preferably 500-2000, more preferably 1000-2000.

[0045] The molar ratio of the diisocyanate to diol is preferably (1.5-5):1, more preferably (2-4):1.

[0046...

Embodiment 1

[0089] In a 250m1 four-necked flask equipped with a stirrer, condensing reflux tube, and thermocouple, add 12.5 grams of IPDI, 30 grams of 2000 molecular weight PTMEG, and 1.6 grams of DMPA and react at 90°C for 3 hours to produce a prepolymer, then add 10.5 grams of MEPG350 Continue to keep warm for 2 hours. Then cool down to 55°C and add 20 grams of acetone to reduce viscosity, continue to cool down to 45°C, add 1.2g of triethylamine for neutralization, and add 180 grams of water to the pre-polymerization after 5 minutes with a high-speed emulsifying disperser under 1000r / min high-speed stirring In the body, after continuing to disperse for 30 minutes, a blue translucent water-based polyurethane emulsion was obtained. Add 1.2g TEGO 245 and 0.48g CIBA5151 dropwise and continue stirring for 30 minutes. The measured solid content of the emulsion is 20%, the particle diameter is 65nm, the Shore hardness of the film is 32, the tensile strength is 5Mpa, and the elongation at brea...

Embodiment 2

[0091] In a 250m1 four-neck flask equipped with a stirrer, condensing reflux tube, and thermocouple, add HDI 8.7g, 2000 molecular weight PCL 30g, DMPA 1.7g and react at 90°C for 3 hours to produce a prepolymer, then add MEPG750 18g to continue The reaction was incubated for 2 hours. Then cool down to 55°C and add 20 grams of acetone to reduce viscosity, continue to cool down to 45°C and add 1.3g of triethylamine for neutralization. After 5 minutes, use a high-speed emulsifying disperser to add 170 grams of water to the pre-polymerization under high-speed stirring at 1000r / min. In the body, after continuing to disperse for 30 minutes, a blue translucent water-based polyurethane emulsion was obtained. Add 1.2g TEGO 245 and 0.48g CIBA 5151 dropwise and continue to stir for 30 minutes. The solid content of the emulsion is 20%, the particle size is 55nm, the Shore hardness of the film is 28, the tensile strength is 4.3Mpa, and the elongation at break is 1400%. The penetration time...

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Abstract

The invention provides waterborne polyurethane. An adopted end-capping agent methoxy poly(ethylene glycol) has nonionic hydrophilic property, so that a final product has two properties of anionic and nonionic polyurethane; a prepared leather filling agent has better permeability compared with waterborne polyurethane with single ionic property. At the same time, the molecular weight of the final product can be controlled by changing the molecular weight of methoxy poly(ethylene glycol), the final product is guaranteed to have relatively proper molecular weight, and thus the prepared leather filling agent achieves relatively good filling performance, an emulsion can be allowed to have good permeability on a skin blank surface, and an excellent filling effect is obtained. At the same time, resin after filling has interaction of ionic bonds and hydrogen bonds with a skin blank at the same time, and the filling agent is allowed to have excellent bonding strength and excellent light resistant stability, and does not affect skin blank colors with long-term placement.

Description

technical field [0001] The invention relates to the technical field of leather, in particular to a water-based polyurethane, a preparation method thereof and a water-based polyurethane leather filler. Background technique [0002] Leather filler is leather filling wax, which is the main auxiliary agent for finishing high-grade leather, which can give leather a special brightness and waxy feeling. [0003] The water-based polyurethane used as a leather filler must have excellent permeability. After spraying, the resin must be able to penetrate into the leather surface completely, so as to achieve the filling effect and make the originally soft leather embryo have a better sense of firmness. [0004] In order to achieve faster penetration performance, the molecular weight of polyurethane should not be too large. Generally, small molecule alcohols are used to cap the reaction residual NCO during the synthesis process to control its molecular weight. [0005] However, the timin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/44C08G18/48C08G18/10C08G18/12C08G18/34C08G18/28C08L75/04C08L75/06C08L75/08
CPCC08G18/10C08G18/12C08G18/4277C08G18/44C08G18/4825C08G18/4854C08G18/6625C08G18/6659C08G18/6692C08L75/04C08L75/06C08L75/08C08G18/348C08G18/283
Inventor 赵旭忠钟望曾晓林
Owner SICHUAN DOWELL SCI & TECH INC