A kind of polyurethane adhesive and preparation method thereof

A technology of polyurethane and modified polyester, applied in the field of polyurethane, can solve the problems of poor water resistance and heat resistance, insufficient bonding strength, high density, etc.

Active Publication Date: 2019-03-08
中科华宇(福建)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with wood-based panels and solid wood, hardwood has the characteristics of high density and thick oil, and has high requirements for the adhesive strength, water and heat resistance, and adhesion to wood. The above-mentioned "trialdehyde" adhesive and PVAc white latex cannot meet the bonding requirements of hardwood due to insufficient bonding strength, poor water and heat resistance, etc.

Method used

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  • A kind of polyurethane adhesive and preparation method thereof
  • A kind of polyurethane adhesive and preparation method thereof
  • A kind of polyurethane adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A polyurethane adhesive for difficult-to-bond hardwoods and a preparation method thereof, mainly comprising the following steps:

[0052] (1) Preparation of castor oil modified polyester polyol

[0053] Add castor oil, phthalic anhydride, neopentyl glycol and catalyst methanesulfonic acid into a reaction kettle with nitrogen gas, use toluene to separate the generated water and polyester polyol, and perform esterification and dehydration in vacuum at 150°C for 3 hours , and then heated up to 170°C to continue the reaction for 4h, cooled and dried in a vacuum oven at 50°C to obtain a castor oil-modified polyester polyol; see Table 1 for the specific dosage of each component.

[0054] (2) Preparation of modified polyurethane adhesive

[0055] Add the obtained castor oil modified polyester polyol, polyadipate-1,4-butylene glycol ester diol with a molecular weight of 2000, and hexamethylene diisocyanate into the reaction kettle, and add the catalyst dibutyltin dilaurate Re...

Embodiment 2

[0058] A polyurethane adhesive for difficult-to-bond hardwoods and a preparation method thereof, mainly comprising the following steps:

[0059] (1) Preparation of castor oil modified polyester polyol

[0060] Add castor oil, phthalic anhydride, propylene glycol and catalyst tetra-n-butyl titanate into a reaction kettle with nitrogen gas, use butyl acetate to separate the generated water and polyester polyol, and dehydrate under vacuum at 160°C After reacting for 2 hours, raise the temperature to 210°C, keep the head temperature not lower than 100°C and react for 5h, after cooling, place it in a vacuum oven at 50°C to dry to obtain castor oil modified polyester polyol; the specific dosage of each component is detailed See Table 1.

[0061] (2) Preparation of modified polyurethane adhesive

[0062] Add the prepared castor oil modified polyester polyol, polyoxypropylene diol with a molecular weight of 2000, and toluene diisocyanate into the reaction kettle, add the catalyst di...

Embodiment 3

[0065] A polyurethane adhesive for difficult-to-bond hardwoods and a preparation method thereof, mainly comprising the following steps:

[0066] (1) Preparation of castor oil modified polyester polyol

[0067] Add castor oil, phthalic anhydride, diethylene glycol and catalyst methanesulfonic acid into a reaction kettle with nitrogen gas, use toluene to separate the generated water and polyester polyol, and perform a vacuum esterification dehydration reaction at 160°C After 2.5 hours, raise the temperature to 220°C, keep the temperature of the distillation head not lower than 100°C for 5 hours, and then place it in a vacuum oven at 50°C to dry to obtain castor oil modified polyester polyol; the specific dosage of each component is detailed See Table 1.

[0068] (2) Preparation of modified polyurethane adhesive

[0069] Add the obtained castor oil modified polyester polyol, polyethylene adipate diol with a molecular weight of 3000 and isophorone diisocyanate into the reaction ...

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Abstract

The invention discloses polyurethane, a composition with same and a method for preparing the polyurethane. The polyurethane is a random copolymer with repeat units shown as a formula I and a formula II. An R<1> in the formulas selectively represents C<2>-C<5> diol, an R<2> selectively represents R<3>CH<2>-CHR<3>-CH<2>R<3>, and the R<3> represents OCO (CH<2>) <7>CH=CHCH<2>CHOH (CH<2>) <5> CH<3>; an n<1> is selectively 1 or 2, an n<2> is selectively an integer ranging from 0 to 3, and the mass percentages of the repeat units, which are shown in the formula I, in the polyurethane range from 4% to 12%; the mass percentages of the repeat units, which are shown in the formula II, in the polyurethane range from 2% to 10%. The polyurethane, the composition and the method have the advantages that the polyurethane is doubly modified by the aid of polyester polyol modified by castor oil and bisphenol A type epoxy resin in polyurethane preparation procedures, accordingly, the cohesion strength, the water resistance and the heat resistance of adhesive can be obviously improved, and base material surface adhesive force of the adhesive can be obviously increased.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to polyurethane prepared by using castor oil modified polyester polyol as a raw material. Background technique [0002] With the development of modern wood processing industry, the amount of adhesives used for wood bonding is not only increasing, but also increasing in variety. Traditional "trialdehyde" adhesives synthesized from urea-formaldehyde resin (UF), phenolic resin (PF), and melamine-formaldehyde resin (MF) are mainly used for wood-based wood bonding, while polyvinyl acetate emulsion (PVAc), ethylene-acetic acid Ethylene copolymer resin (EVA) hot melt adhesives are mainly used for the bonding of ordinary solid wood furniture wood. Compared with wood-based panels and solid wood, hardwood has the characteristics of high density and thick oil, and has high requirements for the adhesive strength, water and heat resistance, and adhesion to wood. The above-mentioned "triald...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/12C08G18/66C08G18/42C08G18/58C08G18/32C08G18/65
CPCC08G18/12C08G18/3206C08G18/4288C08G18/58C08G18/6607C08G18/664C09J175/06C09J175/08C08G18/6511
Inventor 颜财彬陈其辉洪茂椿傅和青林毅林超林进祥
Owner 中科华宇(福建)科技发展有限公司
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