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Industrial gelatin-closed waterborne polyurethane adhesive composition and construction method thereof

A water-based polyurethane, closed-type technology, applied in the preparation of polyurea/polyurethane adhesives, adhesives, animal glue or gelatin, etc., can solve the problems of heat resistance, water resistance and poor mechanical properties, and widely used to achieve water resistance Good results

Active Publication Date: 2018-12-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defects of gelatin such as heat resistance, water resistance and poor mechanical properties limit its wide application.

Method used

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  • Industrial gelatin-closed waterborne polyurethane adhesive composition and construction method thereof
  • Industrial gelatin-closed waterborne polyurethane adhesive composition and construction method thereof
  • Industrial gelatin-closed waterborne polyurethane adhesive composition and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0040] Step 1: Preparation of industrial gelatin aqueous solution:

[0041] Add 10 g of industrial gelatin to 90 g of deionized water, swell at room temperature for 30 minutes, and heat at 40° C. until completely dissolved to obtain an aqueous gelatin solution.

[0042] Step 2: Preparation of closed waterborne polyurethane:

[0043] (1) Add 64mmol of isophorone diisocyanate, 40mmol of polypropylene glycol (Mn=1000) and 2d dibutyltin dilaurate into a three-necked flask equipped with a thermometer, stirrer and glass bottle stopper, mix well, and react at 50°C After 20 minutes, the temperature was raised to 70°C, and the reaction was carried out for 1 hour to obtain a polyurethane prepolymer;

[0044] (2) Add 2.4mmol of dimethylol propionic acid to the above system, raise the temperature to 80°C, then cool down to 50°C, add 43mmol of methyl ethyl ketone oxime to block the polyurethane prepolymer;

[0045] (3) Keep the temperature of the above-mentioned obtained system at 40°C, ...

Embodiment example 2

[0051] Step 1: Preparation of industrial gelatin aqueous solution:

[0052] Add 10 g of industrial gelatin to 90 g of deionized water, swell at room temperature for 30 minutes, and heat at 40° C. until completely dissolved to obtain an aqueous gelatin solution.

[0053] Step 2: Preparation of closed waterborne polyurethane:

[0054] (1) Add 80mmol of isophorone diisocyanate, 40mmol of polypropylene glycol (Mn=1000) and 2d dibutyltin dilaurate into a three-necked flask equipped with a thermometer, stirrer and glass bottle stopper, mix well, and react at 50°C After 20 minutes, the temperature was raised to 70°C, and the reaction was carried out for 1 hour to obtain a polyurethane prepolymer;

[0055](2) Add 4mmol of dimethylolpropionic acid to the above system, raise the temperature to 80°C, then cool down to 40°C, add 79mmol of methyl ethyl ketone oxime to block the polyurethane prepolymer;

[0056] (3) Keep the temperature of the above-mentioned obtained system at 40°C, and ...

Embodiment example 3

[0062] Step 1: Preparation of industrial gelatin aqueous solution:

[0063] Add 10 g of industrial gelatin to 90 g of deionized water, swell at room temperature for 30 minutes, and heat at 40° C. until completely dissolved to obtain an aqueous gelatin solution.

[0064] Step 2: Preparation of closed water-based polyurethane:

[0065] (1) Add 96mmol of isophorone diisocyanate, 40mmol of polypropylene glycol (Mn=1000) and 3d dibutyltin dilaurate into a three-necked flask equipped with a thermometer, a stirrer and a glass bottle stopper, mix well, and react at 50°C After 20 minutes, the temperature was raised to 70°C, and the reaction was carried out for 2 hours to obtain a polyurethane prepolymer;

[0066] (2) Add 6.8mmol of dimethylolpropionic acid to the above system, raise the temperature to 80°C, then cool down to 45°C, add 98mmol of methyl ethyl ketone oxime to block the polyurethane prepolymer;

[0067] (3) Keep the temperature of the above-mentioned obtained system at 4...

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Abstract

The invention relates to a method for preparing an industrial gelatin cross-linked closed waterborne polyurethane wood adhesive. The method comprises: dissolving industrial gelatin from tanning solidwastes in deionized water to swell, heating the solution until complete dissolution to obtain a certain concentration of a gelatin aqueous solution, adding a certain amount of a closed waterborne polyurethane emulsion into the solution, and carrying out uniform stirring at the normal temperature to obtain the gelatin-closed waterborne polyurethane wood adhesive. The closed waterborne polyurethanecross-linked industrial gelatin as a wood adhesive can improve water resistance and bond strength.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane adhesives, in particular to an industrial gelatin-blocked water-based polyurethane adhesive composition and a construction method thereof. Background technique [0002] With the changes in the structure of wood raw materials, the supply of wood materials in my country has shifted from solid wood to glued wood. Today's wood products are mostly made of wood-based panels. According to the statistics of the State Forestry Administration, my country's wood-based panel production reached 36.24 million tons in 2016, accounting for more than 60% of the world's wood-based panel production. Adhesives play the role of bonding wood raw materials in the production of wood-based panels. With the increase of wood-based panels production, the production of wood adhesives is particularly important. [0003] my country is rich in raw hide resources and is one of the largest leather-making countri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J189/00C09J175/08C08G18/66C08G18/48C08G18/34
CPCC08G18/348C08G18/4825C08G18/4833C08G18/4854C08G18/6692C09J175/08C09J189/00C08L75/08C08L89/00
Inventor 王学川张思肖刘新华
Owner SHAANXI UNIV OF SCI & TECH