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Heat-resistant single-component moisture-curing polyurethane adhesive and preparation method and application thereof

A polyurethane adhesive, one-component technology, applied in the direction of non-polymer adhesive additives, adhesive additives, etc., can solve the problems of agglomeration, polymer performance decline, poor compatibility, etc. The effect of bonding strength and excellent bonding performance

Inactive Publication Date: 2019-05-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is still no research report on the simultaneous use of castor oil-modified polyester polyol and silanized nano-silica for the modification of polyurethane to improve the heat resistance of the polymer.
Unmodified castor oil contains more than three active hydroxyl functional groups, and the use of direct partial replacement of polyols will lead to a decrease in polymer performance due to excessive cross-linking, which cannot reflect the excellent performance advantages of castor oil
However, when the nano-silica without silanization modification is used for polyurethane modification, the agglomeration phenomenon is serious due to poor compatibility, and the modification effect is not good.

Method used

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  • Heat-resistant single-component moisture-curing polyurethane adhesive and preparation method and application thereof
  • Heat-resistant single-component moisture-curing polyurethane adhesive and preparation method and application thereof
  • Heat-resistant single-component moisture-curing polyurethane adhesive and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0059] A heat-resistant one-component moisture-curing polyurethane adhesive and a preparation method thereof, mainly comprising the following steps:

[0060] (1) Synthesis of castor oil modified polyester polyol

[0061] Add 15g of castor oil, 25g of phthalic anhydride, 30g of diethylene glycol and 0.05g of catalyst methanesulfonic acid into a reaction kettle with nitrogen gas, and use toluene to separate the generated water and polyester polyols, and at 160°C After vacuum esterification and dehydration reaction for 2.5 hours, raise the temperature to 220°C, keep the head temperature not lower than 100°C for 5 hours, then place it in a vacuum drying oven at 50°C after cooling, and then obtain castor oil modified polyester polyol;

[0062] (2) Silanization modification of nano-silica

[0063] Take 11g of nano-silica and 14g of solvent N-methylpyrrolidone and mix them. After ultrasonic dispersion at room temperature for 1.5h, heat to 35°C, add 2g of γ-aminopropyltriethoxysilane...

Embodiment 2

[0068] A polyurethane adhesive for difficult-to-bond hardwoods and a preparation method thereof, mainly comprising the following steps:

[0069] (1) Preparation of Castor Oil Modified Polyols

[0070] Add 25g of castor oil, 35g of phthalic anhydride, 22g of ethylene glycol and 0.08g of catalyst methanesulfonic acid into a nitrogen-filled reactor, use toluene to separate the resulting water and polyester polyol, and perform vacuum esterification at 150°C After dehydration reaction for 3 hours, raise the temperature to 200°C, keep the head temperature not lower than 100°C for 5 hours, and then place it in a vacuum oven at 60°C to dry to obtain castor oil modified polyester polyol;

[0071] (2) Silanization modification of nano-silica

[0072] Take 12g of nano-silica and 16g of solvent N-methylpyrrolidone and mix them. After ultrasonically dispersing at room temperature for 2 hours, heat to 35°C, add 2.5g of γ-aminopropyltriethoxysilane to the reaction system, and react for 4 ho...

Embodiment 3

[0077] A polyurethane adhesive for difficult-to-bond hardwoods and a preparation method thereof, mainly comprising the following steps:

[0078] (1) Preparation of Castor Oil Modified Polyols

[0079] Add 20g of castor oil, 15g of phthalic anhydride, 18g of neopentyl glycol and 0.05g of catalyst methanesulfonic acid into a reaction kettle with nitrogen gas, and use butyl acetate to separate the generated water and polyester polyol. After vacuum esterification and dehydration reaction for 2 hours, raise the temperature to 200°C, keep the temperature of the distillation head not lower than 100°C for 4 hours, after cooling, put it in a vacuum drying oven at 40°C to dry to obtain castor oil modified polyester polyol;

[0080] (2) Silanization modification of nano-silica

[0081] Take 13g of nano-silica and 15g of solvent N-methylpyrrolidone and mix them, ultrasonically disperse them at room temperature for 1 hour, then heat to 35°C, add 2g of γ-aminopropyltriethoxysilane to the r...

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Abstract

The invention discloses a heat-resistant single-component moisture-curing polyurethane adhesive and a preparation method and application thereof. The preparation method comprises the following step: carrying out esterification reaction on castor oil, phthalic anhydride and dihydric alcohol at first to prepare a castor oil modified polyester polyol with the functionality of 2.0-2.5 and containing abenzene ring aromatic structure and a long fatty acid molecular segment. When partially substituted polyols are used for modification of polyurethane, rigid benzene rings can be introduced into a soft segment. Distribution of microcrystals in the soft segment structure is controlled, so that the flexibility of an adhesive layer is enhanced; the cohesive strength is increased, and the heat resistance is improved; meanwhile, the modified castor oil polyester polyol can effectively control the crosslinking degree of the polymer and prevent the drastic reduction of performance of an adhesive or coagulation caused by excessive crosslinking degree. The castor oil modified polyester polyol is used for modifying polyurethane, so that the adhesive property and the heat resistance of the adhesive can be obviously improved. The adhesion problem of cracking at an adhesion position of wood during high-temperature baking processes such as wood drying and bent plate making in a wood processing process is solved.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a heat-resistant one-component moisture-curing polyurethane adhesive and its preparation method and application. The polyurethane adhesive of the invention has high cohesive strength, strong bonding performance and good heat resistance, and can be used for bonding in the field of wood processing. Background technique [0002] Polyurethane adhesive is a high polymer polymerized by polyisocyanate and polypolyol, which is widely used in the bonding of wood industry. During the curing process, the one-component moisture-curing polyurethane adhesive mainly uses active groups on the molecular chain, such as -NCO, to react with active hydrogen compounds in wood and moisture, or moisture in the air, thereby Play a bonding role. [0003] A single one-component moisture-curing polyurethane adhesive cannot meet the bonding requirements of wood, mainly man...

Claims

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Application Information

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IPC IPC(8): C09J175/14C09J11/04C09J11/06C08G63/49C08G18/68C08G18/66C08G18/42C08G18/32C08G18/48
Inventor 颜财彬陈其辉洪茂椿傅和青林毅林超林进祥
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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