Monocomponent moisture cure urethanes adhesive

A polyurethane adhesive, moisture curing technology, applied in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problem of high cost

Inactive Publication Date: 2010-01-20
SHANGHAI XINGUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this glue encounters water or moisture, the latent agent will first react with water to form a compound containing active hydrogen groups. This compound has a higher reactivity with isocyanate (-NCO) than water, which can improve the initial viscosity. , while avoiding bubbles in the glue layer, but there is still a problem of high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 1,000g of polyethylene adipate glycol 1,2 propylene glycol into the reactor, vacuum dehydrate at 120°C for 1h, cool down, remove the vacuum, add polyphenylpolymethylene polyisocyanate PAPI 135866.7g and carbodiimide Modified MDI-100LL 96.3g. After mixing evenly, in N 2 Gradually raise the temperature under protection, react at 80-85°C for 2 hours, add chain extender 1,4-butanediol 10.5g, continue the reaction for 1h, cool to below 50°C, add 246.7g of dehydration solvent toluene and ethyl acetate, and then Add respectively the coupling agent KH-560 of 0.5% of the total amount of raw materials; the stabilizer phosphoric acid (reagent) of 0.0015% of the total amount of raw materials; the antioxidant Irganox1010 of 0.05% of the total amount of raw materials; the main catalyst bismorpholine of 0.015% of the total amount of raw materials Diethyl ether and the cocatalyst 1,3 dimethyl-2-imidazolidinone (reagent) of 0.02% of the total amount of raw materials are stirred eve...

Embodiment 2

[0018] In a dry and clean reactor, put in 222g of polyphenylmethane polyisocyanate PM-2001 and 135.5g of carbodiimide-modified MDI-100LL in sequence according to the mass ratio, stir and mix evenly, then add dehydrated polyethylene adipate Alcohol neopentyl glycol ester 800g and phthalic anhydride diethylene glycol ester 200g, in N 2 Under protection, the temperature was gradually raised to react, and the reaction was carried out at 80-85° C. for 2 hours, 18.9 g of 1,4-butanediol was added, and the reaction was continued for 1 hour. Cool and add dehydration organic solvent toluene and ethyl acetate each 295g, and according to the operation step of embodiment 1, add the H 3 PO 4 , the coupling agent KH-560 of 0.5% of the total amount of raw materials, the antioxidant Irganox1010 of 0.05% of the total amount of raw materials, the catalyst bismorpholine diethyl ether of 0.015% of the total amount of raw materials and the cocatalyst 1 of 0.02% of the total amount of raw materials...

Embodiment 3

[0022] In the formula of embodiment 1, remove the catalyzer dibutyltin dilaurate of 0.015% of the total amount of raw materials to replace bismorpholine diethyl ether and the stabilizer phosphoric acid consumption to increase from 0.0015% of the total amount of raw materials to 0.012% of the total amount of raw materials Except, other formula and operating process are identical with embodiment 1.

[0023] The obtained one-component moisture-curing polyurethane adhesive has a setting time of 2 hours, an applicable time of 4 hours, and a shear strength of 9.5Mpa for 7 days; the relative gel time is shortened to 17’26”; the flocking products are full of fluff and feel good.

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Abstract

The invention provides a monocomponent moisture cure urethanes adhesive. The adhesive comprises the following compositions in portion by weight: 100 portions of isocyanate terminated polyurethane prepolymer, 0.025 to 0.25 portion of composite catalyst, 0.001 to 0.3 portion of stabilizer, 0.5 to 2 portions of coupling agent, 0.05 to 0.30 portion of antioxidant and 0 to 25 portions of diluting agent which react and are mixed, wherein the isocyanate terminated polyurethane prepolymer is prepared by reactions of polyisocyanates which is mixed by carbodiimide modified methyl diphenylene diisocyanate or 4,4'-methyl diphenylene diisocyanate and polyaryl polymethylene isocyanate, and polyester polyol with number average molecular weight of Mn of between 400 and 2,500 or polyether polyol with number average molecular weight of Mn of between 400 and 4,000 and a chain extender. The adhesive has higher curing speed and longer applicable time, can be bonded with an aluminum alloy with shearing strength more than or equal to 8MPa after curing at room temperature, has plump fluff and good hand feeling in electrostatic flocking products with abrasion resistance of a spinning machine roller reaching over 10,000 times.

Description

technical field [0001] The invention relates to a one-component moisture-curing polyurethane adhesive and its preparation method. The adhesive utilizes the strong polar group NCO group in the main component to react with a small amount of water or active hydrogen in the air or on the surface of the adherend. Associated with bond strength. It is especially suitable for electrostatic flocking or bonding of some metals such as aluminum, iron, galvanized sheet or non-metals such as ABS, PVC, PC, PVC rubber and plastic parts and hardwood products at room temperature. Background technique [0002] Polyurethane adhesives have good adhesion, variety, outstanding oil resistance, low temperature resistance and impact resistance, so they have developed rapidly in recent decades. One-component moisture-curing polyurethane adhesive is favored by users because of its single-liquid packaging, easy to use, and will not cause the trouble of two-component compounding and the disadvantages of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/06C08G18/76C08G18/42C08G18/48
Inventor 陆冬贞高卫纲蔡华
Owner SHANGHAI XINGUANG CHEM
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