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Double-component solvent-free reactive polyurethane hot-melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, solvent-free technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc. Environmental protection, slow glue curing speed and other problems, to achieve the effect of adapting to a wide range of substrates, saving curing time, and good health and safety performance

Inactive Publication Date: 2015-03-11
广州圣夫瑞实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a two-component solvent-free reactive polyurethane hot-melt adhesive and its preparation method to solve the problem of environmental protection and cost of two-component solvent-based adhesives. High problem, solve the problem that the traditional solvent-free polyurethane adhesive has no initial adhesion and limited application range, solve the problem of low bonding strength and limited performance of water-based acrylic adhesive, and solve the problem of slow curing speed of the aforementioned glue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Choose two components, component A and component B, where component A is a difunctional isocyanate prepolymer, and component B is a difunctional hydroxyl-terminated polyester prepolymer, using a special two-component hot melt adhesive The rubber mixing equipment heats the two components to 70-90°C, uses a servo motor and a metering gear pump to control the ratio of the two components, and mixes them through a static mixing tube. Special gluing equipment is coated on polyester (PET) film printed with white ink and laminated with aluminum foil (Al). The coating amount is 1.6 – 2.0 g / m2, the speed is 80 – 150 m / min, and the drying is turned off. After heating and exhausting, the product with excellent appearance can be obtained after winding, and there are no gray spots, spots, white spots and "tunnels" on the appearance surface; after being placed at room temperature (18-25°C) for 2-36 hours Tested according to GB / T10004-2008, the average peel strength has reached above 4...

Embodiment 2

[0030] Choose two components, component A and component B, where component A is a difunctional isocyanate prepolymer, and component B is a difunctional hydroxyl-terminated polyester prepolymer, using a special two-component hot melt adhesive The rubber mixing equipment heats the two components to 70-90°C, uses a servo motor and a metering gear pump to control the ratio of the two components, and mixes them through a static mixing tube. Special gluing equipment is coated on the polyester (PET) film printed with white ink and laminated with polyester aluminized film (VM-PET), the coating amount is 1.4 – 1.8 g / m2, and the speed is 80 – 150 m / min, turn off the heating and exhaust of the drying tunnel, and get a product with excellent appearance after winding, without gray spots, spots, white spots and "tunnels" on the surface; at room temperature (18-25°C) After being placed for 2-36 hours, it was tested according to GB / T10004-2008, and the average peel strength reached more than ...

Embodiment 3

[0032] Choose two components, component A and component B, where component A is a difunctional isocyanate prepolymer, and component B is a difunctional hydroxyl-terminated polyether prepolymer, using a special two-component hot melt adhesive The rubber mixing equipment heats the two components to 70-90°C, uses a servo motor and a metering gear pump to control the ratio of the two components, and mixes them through a static mixing tube. The special glue coating equipment is coated on the polyester aluminized film (VM-PET) and laminated with the paper. The coating amount is 1.5-2.4 g / m2, the speed is 60-150 m / min, and the heating and exhaust of the drying tunnel are turned off. After winding, the product with excellent appearance can be obtained, and there are no bubbles, spots, lines and "tunnels" on the surface of the appearance. Check the peeling strength immediately after stopping the machine, and it can reach the strength of 100% tearing of paper fibers.

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Abstract

The invention discloses a double-component solvent-free reactive polyurethane hot-melt adhesive and a preparation method thereof. The double-component solvent-free reactive polyurethane hot-melt adhesive is characterized by comprising a component A and a component B, wherein the component A is a bifunctional or polyfunctional isocyanate-terminated prepolymer, and the isocyanate content is 2-25%; the component B is a bifunctional or polyfunctional hydroxyl-terminated polymer, and the hydroxyl value is 10-250 mg KOH / g; and when the temperature is 50 DEG C, the viscosity of the component A and component B is not lower than 1000 cps. The double-component solvent-free reactive polyurethane hot-melt adhesive disclosed by the invention solves the problem of no initial viscosity in the common double-component solvent-free reactive polyurethane adhesive, and has the advantages of lower cost and wider applicability as compared with the common single-component solvent-free reactive polyurethane hot-melt adhesive.

Description

【Technical field】 [0001] The invention relates to a hot-melt adhesive and a preparation method thereof, in particular to a two-component solvent-free reactive polyurethane hot-melt adhesive and a preparation method thereof. 【Background technique】 [0002] In industries such as flexible packaging, 1) two-component solvent-based polyurethane adhesives, 2) two-component solvent-free polyurethane adhesives, 3) one-component solvent-free polyurethane adhesives, and 4) water-based acrylate adhesives are mainly used in domestic and foreign markets. big category. [0003] Two-component solvent-based polyurethane adhesive is currently the most widely used due to its simple operation and stable and reliable performance. However, since the glue itself contains about 25-50% of organic solvents, it is necessary to add additional organic solvents for dilution and preparation during use. Every gram of dry glue coated requires about three grams of organic solvents, so there is environmenta...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J175/06C09J175/08
Inventor 龙万堂
Owner 广州圣夫瑞实业有限公司
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