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High-bonding-strength and high-temperature-resisting phenolic resin modified polyurethane adhesive and preparation method thereof

A polyurethane adhesive and phenolic resin technology, applied in the field of polymers, can solve the problems of low cohesive strength and poor high temperature resistance of polyurethane adhesives, and achieve improved bond strength, high temperature resistance, high temperature resistance, The effect of simple preparation process

Inactive Publication Date: 2012-10-10
高金技术产业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyurethane adhesives have low cohesive strength and poor high temperature resistance

Method used

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  • High-bonding-strength and high-temperature-resisting phenolic resin modified polyurethane adhesive and preparation method thereof

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preparation example Construction

[0022] The invention provides a method for preparing a high-bond strength and high-temperature-resistant phenolic resin-modified polyurethane adhesive, comprising the following steps:

[0023] Synthesis of modified phenolic resin: 9-11 parts by weight of methoxyxylene monomer and 9-10 parts by weight of phenols are added at 115-135 ° C, and 0.1-0.3 parts by weight of acidic catalyst are added to react for 2-3 hours , after dehydration, lower the temperature and cool down, then add 0.3-0.6 parts by weight of basic catalyst, 6-10 parts by weight of organic solvent and 9-11 parts by weight of formaldehyde, dehydration reaction under vacuum of 0.3-0.75KPa, until transparent Obtain modified phenolic resin;

[0024] Preparation of polyurethane prepolymer: react 10-30 parts by weight of polyisocyanate and 40-100 parts by weight of polyester polyol at 65-75°C for 2-3 hours to obtain a polyurethane prepolymer;

[0025] Synthesis of modified polyurethane prepolymer: react the modified ...

Embodiment 1

[0038] Add 9 parts of methoxyxylene monomer, 9 parts of phenol and 0.1 part of sulfuric acid with a concentration of 20wt%, and react for 3 hours at 115°C. After cooling down, add 0.3 parts of potassium hydroxide, 6 parts of toluene and 9 parts of Formaldehyde, dehydration reaction under a vacuum of 0.3KPa, to obtain a modified phenolic resin after being transparent;

[0039] 10 parts of toluene diisocyanate and 40 parts of polyethylene adipate with a relative molecular weight of 2000 were reacted at 65°C for 2 hours to obtain a polyurethane prepolymer;

[0040] React the modified phenolic resin with the polyurethane prepolymer at 65°C for 2.5 hours to obtain a modified polyurethane prepolymer;

[0041]Add water to the modified polyurethane prepolymer and disperse it with a disperser. The speed of the disperser is 1500r / min. React at ℃ for 15 minutes to obtain a modified water-based polyurethane adhesive.

[0042] The test of the modified polyurethane adhesive prepared by th...

Embodiment 2

[0044] Add 10 parts of methoxyxylene monomer, 10 parts of phenol and 0.2 parts of hydrochloric acid with a concentration of 25wt%, and react for 3 hours at 125°C. After cooling down, add 0.5 parts of sodium hydroxide, 8 parts of toluene and 10 parts of Formaldehyde, dehydration reaction under the vacuum of 0.5KPa, obtain modified phenolic resin after becoming transparent;

[0045] 20 parts of diphenylmethane-4,4'-diisocyanate and 60 parts of polycaprolactone diol with a relative molecular weight of 3000 were reacted at 75°C for 3 hours to obtain a polyurethane prepolymer;

[0046] React the modified phenolic resin with the polyurethane prepolymer at 75°C for 2.5 hours to obtain a modified polyurethane prepolymer;

[0047] Add water to the modified polyurethane prepolymer, disperse it with a disperser, the speed of the disperser is 2500r / min, add 1.0 parts of methylamine, 0.5 parts of butanediamine and 2 parts of neopentyl glycol, and react at 45°C for 10 minutes , to obtain a...

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Abstract

The invention discloses a high-bonding-strength and high-temperature-resisting phenolic resin modified polyurethane adhesive and a preparation method thereof. The preparation method comprises the following steps of: synthesizing modified phenolic resin, preparing polyurethane prepolymer, synthesizing modified polyurethane prepolymer, and synthesizing the modified polyurethane adhesive, wherein the step of synthesizing the modified phenolic resin is carried out by adding methoxyl dimethylbenzene monomer and phenols in phenolic resin to react under the effect of an acid catalyst, cooling the mixture, and then adding a basic catalyst, solvent and formaldehyde in the mixture for dehydration reaction under vacuum until the mixture is transparent, thus obtaining the modified phenolic resin; the step of preparing the polyurethane prepolymer is carried out by adding polyisocyanates and polyester polyol in the modified phenolic resin for reacting; the step of synthesizing the modified polyurethane prepolymer is carried out by modifying the polyurethane prepolymer through the modified phenolic resin to obtain the modified polyurethane prepolymer; and the step of synthesizing the modified polyurethane adhesive is carried out by adding water to the modified polyurethane prepolymer, and dispersing the modified polyurethane prepolymer through dispersing agent, and finally adding neutralizing agent, cross-linking agent and chain extender into the dispersed modified polyurethane prepolymer to obtain the modified aqueous polyurethane adhesive. The preparation method disclosed by the invention is simple, and improves the bonding strength and high temperature resistance of the polyurethane adhesive.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a phenolic resin modified polyurethane adhesive and a preparation method thereof. [0002] Background technique [0003] Phenolic resin is a resin formed by polycondensation of phenol and formaldehyde under catalyst conditions. Phenolic resin has good acid resistance, mechanical properties, and heat resistance, and is widely used in anti-corrosion engineering and adhesives. [0004] Today, as environmental problems and awareness of environmental protection are increasing, the research and development of environmentally friendly adhesives is increasingly valued. Among them, environmentally friendly polyurethane adhesives are characterized by energy saving, high bonding strength, excellent comprehensive performance, and wide application. The benefits are quickly and widely recognized. [0005] Environmentally friendly polyurethane adhesives include solvent-free polyurethane adhesives and ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/54C08G18/42C08G18/10C08G8/28C09J175/06
Inventor 凤翔
Owner 高金技术产业集团有限公司
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