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Method for preparing solvent-free waterborne polyurethane resin for synthesizing leather bonding layer

A water-based polyurethane, solvent-free technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low production costs, improve toughness, increase bonding strength, and increase elongation at break rate effect

Active Publication Date: 2014-07-23
ZHEJIANG NAIHE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the shortcomings of the above-mentioned prior art, and provides a method for preparing a solvent-free water-based polyurethane resin used for the adhesive layer of synthetic leather. The raw materials such as agent, metal catalyst, hydrophilic chain extender, neutralizing agent, and ketimine solve the solubility problem and viscosity problem in the synthesis process on the basis of not using organic solvents, and the solvent-free Water-based polyurethane resin, without organic solvents, will not pollute the environment, has good environmental protection effect, low production cost, and meets people's needs

Method used

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  • Method for preparing solvent-free waterborne polyurethane resin for synthesizing leather bonding layer
  • Method for preparing solvent-free waterborne polyurethane resin for synthesizing leather bonding layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step, add the propylene oxide polyether polyol of 35g polycaprolactone polyol and 50g in the four-hole bottle that is equipped with thermometer, reflux condenser and constant speed stirrer, the molecular weight of polycaprolactone polyol is 2000, The molecular weight of propylene oxide polyether polyol is 1000, vacuum dehydration at 110℃~120℃ for 2 hours, then cool down to 50℃, then add 30g of toluene diisocyanate, 3.5g of neopentyl glycol and 0.1g of organic bismuth Add the catalyst into the reactor and gradually raise the temperature to 80°C for 2 hours of polymerization, then add 5.3g of dimethylolbutyric acid to continue the constant temperature reaction for 2.5 hours, take samples, and use the di-n-butylamine method to measure its NCO value. After the index is qualified, cool down to 70 Below ℃, add 3.9g triethylamine to neutralize, then add 1.2g acetonimine to obtain waterborne polyurethane resin prepolymer;

[0028] In the second step, add 200g of deion...

Embodiment 2

[0031] The first step, add the propylene oxide polyether polyol of 35g polycarbonate polyol and the propylene oxide polyether polyol of 50g in the four-neck flask that is equipped with thermometer, reflux condenser and constant speed stirrer, the molecular weight of polycarbonate polyol is 2000, epoxy The molecular weight of propane polyether polyol is 1000, and it is dehydrated under vacuum for 2 hours at a temperature of 110°C to 120°C, then cooled to 50°C, and then 30g of toluene diisocyanate, 3.1g of neopentyl glycol and 0.1g of bismuth-zinc alloy catalyst Add it into the reactor and gradually raise the temperature to 80°C for 2 hours of polymerization, then add 5.3g of dimethylol butyric acid to continue the heat preservation reaction for 2.5 hours, take samples, use the di-n-butylamine method to measure its NCO value, and cool down to 70°C after the index is qualified Next, add 3.9g triethylamine to neutralize, then add 1.2g acetonimine to obtain the waterborne polyuretha...

Embodiment 3

[0035]The first step, add the polytetrahydrofuran ether polyol of 42g polycaprolactone polyol and 44g in the four-neck flask that is equipped with thermometer, reflux condenser and constant speed stirrer, the molecular weight of polycaprolactone polyol is 2000, polytetrahydrofuran The molecular weight of the ether polyol is 1000, vacuum dehydration at a temperature of 110°C to 120°C for 2 hours, and then lower the temperature to 60°C, then add 27.5g of hexamethylene diisocyanate, 3.1g of neopentyl glycol and 0.3g of organic bismuth Add the catalyst into the reactor and gradually raise the temperature to 80°C for 2 hours of polymerization, then add 5.3g of dimethylolbutyric acid to continue the heat preservation reaction for 2.5 hours, take samples, and use the di-n-butylamine method to measure the NCO value. After the index is qualified, the temperature is lowered to 70 Below ℃, add 3.9g triethylamine to neutralize, then add 1.8g N-phenylacetonimine to obtain waterborne polyure...

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Abstract

The invention discloses a method for preparing a solvent-free waterborne polyurethane resin for synthesizing a leather bonding layer. The solvent-free waterborne polyurethane resin is prepared by adopting the steps of polymerization, emulsion and compounding. The method has the beneficial effects that no organic solvent is used in the preparation process, but water is used as a dispersion medium completely, so that the production is clean, the environmental pollution is reduced, the environmental-friendliness effect is good, and the production cost is lowered; through later chain extension stabilized by using ketimine, the bonding firmness and the toughness of the waterborne polyurethane resin are improved, and moreover due to addition of the additives such as a cross-linking agent, a leveling agent and a thickening agent in the compounding process, the leveling effect of a product is improved, the cross-linking curing degree is further improved, the product is more excellent in wearing resistance, solvent resistance and water resistance, good in bonding firmness, good in use effect and beneficial for popularization.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, in particular to a preparation method of a solvent-free water-based polyurethane resin used for an adhesive layer of synthetic leather. Background technique [0002] At present, in the production process of domestic synthetic leather, solvent-based polyurethane resin is mainly used as the basic raw material for leather products. This type of PU resin is based on toluene, xylene, methyl ethyl ketone (MEK) and dimethyl formaldehyde. Amide (DMF), etc. are used as the main solvent to obtain by solvent polymerization. These organic solvents, which account for more than 60% of the entire resin composition, are harmful substances and cause harm to the human body in many ways. [0003] my country's synthetic leather industry is in the transition period from the traditional solvent-based system to the water-based system. With the strong support of government departments, many enterprises have b...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J175/08C08G18/66C08G18/42C08G18/48C08G18/12C08G18/30
Inventor 应建国彭鹤验
Owner ZHEJIANG NAIHE IND
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