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Quick-drying polyurethane adhesive with single component and no solvent and preparation method thereof

A solvent-free polyurethane, quick-drying technology, used in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc. Insufficient and other problems, to achieve the effect of fast curing speed, good operability and reducing curing time

Inactive Publication Date: 2012-12-19
JIANGMEN YIYUAN BIOCHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Solvent-free one-component polyurethane adhesive is currently a hot spot in the research of polyurethane adhesives at home and abroad. First of all, it is non-toxic and pollution-free. Secondly, it does not need to be stoichiometric or add other cross-linking agents before use. It can be used directly, and it is easy to operate and easy to control. It saves time and effort, but most of the solvent-free one-component polyurethane adhesives currently on the market have several problems: a. The initial adhesion is poor, and the curing process takes a long time; b. Bubbles are released during the curing process, causing the adhesive layer to foam and expand. Shrinkage cavity is formed, which affects the bonding strength; c, high viscosity, difficult to control the thickness of the adhesive film, and poor operability

Method used

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  • Quick-drying polyurethane adhesive with single component and no solvent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 270kg of polyoxypropylene castor oil polyol into the reaction kettle, stir and raise the temperature to 115°C, turn on the vacuum pump, and dehydrate under reflux for 2h. Then cool down to 67°C, fill with nitrogen protection, add 250kg of diphenylmethane diisocyanate to react for 4 hours, add 8.6kg of bisoxazolidine to the system, keep stirring at 50°C for 0.5h, and then add 0.23kg of dilauric acid Dibutyltin, heat preservation and stirring at 50°C for 0.5h, and finally measure the content of -NCO groups in the system. When the percentage content of -NCO groups decreases to about 2.5%, cool down and store in airtight, that is, one-component quick-drying Type solvent-free polyurethane adhesive.

[0035] After testing, the NCO content of this product is 2.1%, the curing time is 35min, and the viscosity is 4750mPa.s / 25℃.

Embodiment 2

[0037] Add 216kg of polyoxypropylene castor oil polyol into the reaction kettle, stir and raise the temperature to 110°C, turn on the vacuum pump, and dehydrate under reflux for 1.5h. After that, the temperature was lowered to 65°C, filled with nitrogen protection, and 250kg of diphenylmethane diisocyanate was added to react for 3.5h, then 0.11kg of triethylenetetramine was added to the system, kept stirring at 50°C for 0.5h, and 7.7kg of isoxane was added For oxazolidine, heat and stir at 50°C for 0.5h, and finally measure the content of -NCO groups in the system. When the percentage content of -NCO groups decreases to about 3%, cool down and store in airtight to obtain a single-component fast Dry solvent-free polyurethane adhesive.

[0038] After testing, the NCO content of this product is 2.4%, the curing time is 35min, and the viscosity is 3950mPa.s / 25℃.

Embodiment 3

[0040]Add 181 kg of polyoxypropylene castor oil polyol into the reaction kettle, stir and heat up to 110° C., turn on the vacuum pump, and dehydrate under reflux for 1 hour. After that, the temperature was lowered to 67°C, filled with nitrogen protection, 250kg of diphenylmethane diisocyanate was added to react for 3 hours, and then 7.3kg of (S)-(-)-4-tert-butyl-2-oxazolidinone was added to the system, Stir at 50°C for 0.5h, then add 0.2kg of dibutyltin dilaurate and 0.11kg of triethylenetetramine, keep stirring at 50°C for 0.5h, and finally measure the content of -NCO groups in the system. When -NCO When the percentage content of the base is reduced to about 3.5%, the temperature is lowered, and airtight storage is performed to obtain a one-component quick-drying solvent-free polyurethane adhesive.

[0041] After testing, the NCO content of this product is 3.4%, the curing time is 40min, and the viscosity is 3525mPa.s / 25℃.

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Abstract

The invention discloses a quick-drying polyurethane adhesive with single component and no solvent. The polyurethane adhesive is prepared from the following components by mass percent: 0.5 to 10 % of oxazolidines substances, 0.01 to 0.5 % of an organic tin catalyst or an organic amine catalyst, 40 to 75 % of polyol and 15 to 55% of polyisocyanates. The invention further relates to a preparation method of the polyurethane adhesive. The method comprises a step of adding the polyol into a reactor, stirring to warm, vacuumizing, and dehydrating with reflux so as to remove moisture in materials; a step of adding the polyisocyanates into the reactor to react with the polyol to prepare polyurethane prepolymer with a NCO group; a step of adding the oxazolidines substances; and a step of determining that a NCO content reaches requirements and then packaging to obtain the product. The organic tin catalyst or the organic amine catalyst is added in the above-described preparation steps. The polyurethane adhesive has advantages of high bonding intensity, moderate viscosity, good operating performance and quick solidification speed.

Description

technical field [0001] The invention relates to a polyurethane adhesive, in particular to a one-component quick-drying solvent-free polyurethane adhesive and a preparation method thereof. Background technique [0002] Polyurethane (PU) is a class of polymers polymerized from isocyanates and oligomer polyols. Because its main chain contains a large number of carbamate groups, it endows polyurethane materials with the advantages of high strength, high wear resistance, high elasticity and excellent low temperature resistance, and its hardness can be adjusted in a wide range , so it is widely used in many fields such as adhesives, coatings and composite materials. [0003] Polyurethane adhesives are a type of adhesives containing carbamate groups and isocyanate groups in the base material molecules. They have superior performance and are widely used in the national economy. [0004] Solvent-free one-component polyurethane adhesive is currently a hot spot in the research of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/14C09J11/06C08G18/67
Inventor 胡孝勇陈锦凡韩建祥吴翔宇
Owner JIANGMEN YIYUAN BIOCHEM ENG
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