Solvent-free polyurethane adhesive for compound film

A solvent-free polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve safety problems, environmental pollution, energy consumption and other problems, and achieve low hydrolysis and high safety , Improve the effect of bonding strength

Active Publication Date: 2009-08-12
黄山万丽美油墨科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the adhesives used in the domestic food packaging composite film industry are solvent-based. The existence of a large number of solvents has environmental pollution and safety problems, and consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] ① Preparation of component A: Add 0.01mol dimer acid, 0.18mol adipic acid, 0.14mol terephthalic acid, 0.10mol diethylene glycol, 0.17mol neopentyl glycol, 0.17mol 1,4-butanediol to In the reaction kettle, the temperature was raised with stirring under weak nitrogen flow, and the temperature was controlled at 140-160°C. The inlet temperature of the condenser is controlled at 100°C, and after 5 hours of reaction, the temperature is raised to 200°C; after another 4 hours of reaction, a sample is taken to measure the acid value, and the acid value is less than 30mgKOH / g, and the nitrogen flow is stopped; After 1 hour, take a sample to measure the acid value, the acid value is less than 1mgKOH / g, and the product is discharged, and the product is a light yellow liquid, and the A component is obtained. The viscosity at 25°C is 1100mPa·s, and the hydroxyl value is 140mgKOH / g.

[0020] ②Preparation of component B: first dehydrate polyoxypropylene diol and polytetrahydrofuran di...

Embodiment 2

[0023] ① Preparation of component A: Add 0.10mol of dimer acid, 3.00mol of adipic acid, 1.20mol of diethylene glycol, 2.10mol of neopentyl glycol, and 2.00mol of 1,4-butanediol into the reactor, Under normal circumstances, raise the temperature to 70°C for reaction, take a sample after 2 hours, and measure the NCO group content. When the NCO mass content changes ≤ 0.01%, stop the reaction, lower the temperature, pour the product into a dry storage bottle and seal it, and obtain the B component. The reaction was carried out according to the method described in Example 1 to obtain component A with a viscosity of 830 mPa·s and a hydroxyl value of 178 mgKOH / g at 25°C.

[0024] ②Preparation of component B: After dehydration, take 0.39mol of polyoxypropylene diol with a molecular weight of 700, 0.08mol of polyoxypropylene triol, and 2.73 mol of polyphenylpolymethylene polyisocyanate with a water mass percentage of less than 0.05% after dehydration. mol in a reactor, reacted accordin...

Embodiment 3

[0027] ① Preparation of component A: Add 0.16mol of dimer acid, 1.7mol of sebacic acid, 0.75mol of isophthalic acid, 0.94mol of diethylene glycol, 1.67mol of neopentyl glycol, and 1.68mol of 1,4-butanediol into In the reaction kettle, the reaction was carried out according to the method described in Example 1 to obtain component A with a viscosity of 1150 mPa·s and a hydroxyl value of 174 mgKOH / g at 25°C.

[0028] ② Preparation of component B: take 0.30 mol of polyoxypropylene diol with a molecular weight of 2000 and 1.43 mol of isophorone diisocyanate with a water mass percentage of less than 0.05% after dehydration, and raise the temperature while stirring React at 70°C, add 0.02mol of HDI trimer after 2h to continue the reaction, take a sample after 2h, measure the NCO group content, stop the reaction when the NCO mass content changes ≤0.01%, and get B component, at 25°C The viscosity is 2500mPa·s, NCO%=10.3%.

[0029] ③According to the molar ratio of functional groups NCO...

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Abstract

The invention discloses a solvent-free polyurethane adhesive for a composite film, which consists of an A component and a B component, wherein the A component is end-OH polyester polyol, and the B component is end NCO-polyurethane prepolymer; and the A component and the B component are mixed in the molar ratio of functional groups of NCO to OH being 1.2-1.9:1.0. The polyurethane adhesive for the composite film does not need to adopt solvent and has high safety. The adhesive shows low hydroscopic property as well as low hydrolysis and high shock strength due to introducing dimeric dibasic acid, and shows good adhesive property for some substrates which are particularly difficult to adhere and attach. The invention improves the adhesive strength of the composite film through the design of compositions and a molecular structure of the adhesive, the T peeling strength reaches more than 3.8N/15mm after the plastic films are compounded for 3 to 5 days, and the T peeling strength between the plastic and an aluminum-plating film reaches more than 4.2N/15mm.

Description

technical field [0001] The invention relates to a high-strength two-component solvent-free polyurethane adhesive formulation suitable for composite membranes and a preparation method thereof. Background technique [0002] Most of the adhesives used in the domestic food packaging composite film industry are solvent-based. The existence of a large amount of solvents has environmental pollution and safety problems, and consumes a lot of energy. With the improvement of the country's environmental protection requirements, the discharge of solvents should be gradually limited, and the use of solvent-based adhesives should be gradually reduced. The use of solvent-free composite technology fully meets the requirements of high efficiency, environmental protection, and energy saving. It has the technical advantages of simple process flow, small equipment footprint, low raw material, low energy consumption, low maintenance costs, and high production speed. There is no damage to the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06
Inventor 王小妹陈为都何彦萱
Owner 黄山万丽美油墨科技有限公司
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