Preparation method of solvent-free polyurethane adhesive

A polyurethane adhesive, solvent-free technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as long open time, adhesive penetration, inability to achieve large-scale industrial production, and achieve good mechanical properties. The effect of strength, good mechanical properties

Active Publication Date: 2021-11-23
福建恒力达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For adhesives, because many of the surfaces to be bonded are loose and porous, when the viscosity of the adhesive is low, the adhesive will penetrate. At the same time, due to the long opening time, large-scale industrial production cannot be realized.

Method used

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  • Preparation method of solvent-free polyurethane adhesive

Examples

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Effect test

preparation example Construction

[0030] The preparation method of solvent-free polyurethane adhesive comprises the steps:

[0031] Step 1, the preparation of polyurethane emulsion:

[0032] In a three-neck flask equipped with a thermometer and a stirring rod, first put the self-made polyester diol in N2 Under protection, dehydrate under vacuum at 115°C for 100min, then cool to 70°C, adjust the rotating speed to 200r / min, slowly add isophorone diisocyanate and dibutyltin dilaurate (catalyst, the dosage is 0.01% of the mass of the reactant), and React at 90°C for 2.5h, use the di-n-butylamine method to measure the mass fraction of -NCO groups, when it reaches the theoretical value (9.59%-9.69%), cool to 78°C, add metered dimethylolbutyric acid and Dibutyltin dilaurate (the amount used is 0.01% of the mass of the reactant), adjust the rotating speed to 250r / min, and react at 80°C for 2.5h; then use the di-n-butylamine method to measure the mass fraction of the -NCO group, when it reaches the theoretical value A...

Embodiment 1

[0050] The preparation method of solvent-free polyurethane adhesive comprises the steps:

[0051] Step 1, the preparation of polyurethane emulsion:

[0052] In a three-neck flask equipped with a thermometer and a stirring rod, first put the self-made polyester diol in N 2 Under protection, dehydrate under vacuum at 115°C for 100min, then cool to 70°C, adjust the rotating speed to 200r / min, slowly add isophorone diisocyanate and dibutyltin dilaurate (catalyst, the dosage is 0.01% of the mass of the reactant), and React at 90°C for 2.5h, use the di-n-butylamine method to measure the mass fraction of -NCO groups, when it reaches the theoretical value (9.59%-9.69%), cool to 78°C, add metered dimethylolbutyric acid and Dibutyltin dilaurate (the amount used is 0.01% of the mass of the reactant), adjust the rotating speed to 250r / min, and react at 80°C for 2.5h; then use the di-n-butylamine method to measure the mass fraction of the -NCO group, when it reaches the theoretical value ...

Embodiment 2

[0063] The preparation method of solvent-free polyurethane adhesive comprises the steps:

[0064] Step 1, the preparation of polyurethane emulsion:

[0065] In a three-neck flask equipped with a thermometer and a stirring rod, first put the self-made polyester diol in N 2 Under protection, dehydrate under vacuum at 115°C for 100min, then cool to 70°C, adjust the rotating speed to 200r / min, slowly add isophorone diisocyanate and dibutyltin dilaurate (catalyst, the dosage is 0.01% of the mass of the reactant), and React at 90°C for 2.5h, use the di-n-butylamine method to measure the mass fraction of -NCO groups, when it reaches the theoretical value (9.59%-9.69%), cool to 78°C, add metered dimethylolbutyric acid and Dibutyltin dilaurate (the amount used is 0.01% of the mass of the reactant), adjust the rotating speed to 250r / min, and react at 80°C for 2.5h; then use the di-n-butylamine method to measure the mass fraction of the -NCO group, when it reaches the theoretical value ...

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Abstract

The invention discloses a preparation method of a solvent-free polyurethane adhesive, comprising the following steps: step 1, preparation of polyurethane emulsion; step 2, preparation of modified nano silicon dioxide: step 3, heating the polyurethane emulsion to 60-70 ℃, and start stirring at a constant speed of 150r / min, keep stirring, slowly add modified nano-silica, and then add defoamer to prepare polyurethane adhesive. The invention uses solvent-free polyurethane emulsion as the main body of the adhesive, and uses self-made polyester diol and diisocyanate to react to synthesize polyurethane emulsion, which has a sufficiently low viscosity, is suitable for the solvent-free preparation of polyurethane emulsion, and truly achieves solvent-free addition. , and has good enough mechanical properties after film formation; using modified nano-silica as a reinforcing filler to add to the adhesive can effectively improve the peel strength; no solvent emissions, no pollution, high safety, good bonding performance, High peel strength, suitable for large-scale industrial applications.

Description

technical field [0001] The invention belongs to the technical field of adhesive preparation, and in particular relates to a preparation method of a solvent-free polyurethane adhesive. Background technique [0002] Polyurethane adhesive is a medium-to-high-end adhesive with excellent flexibility, impact resistance, chemical resistance, and abrasion resistance. By adjusting the raw materials and formula, it can be designed to be suitable for bonding between various materials and for various purposes. The multi-type polyurethane adhesives are widely used in a wide range of fields, mainly including: woodworking industry, packaging industry, building paving, etc. [0003] The production methods of polyurethane adhesives include solution method and solid resin dissolution method. The adhesive contains a large amount of solvent. When the solvent evaporates, the adhesive material is evenly coated on the bonded surface to play the role of adhesive. Commonly used solvents include: or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J11/04C08G18/42C08G63/183C08G63/83
CPCC08G18/4213C08G63/183C08G63/83C08K2201/011C09J11/04C09J175/06C08K9/06C08K3/36
Inventor 不公告发明人
Owner 福建恒力达新材料有限公司
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