Double-component solvent-free polyurethane adhesive and preparation method thereof

A solvent-free polyurethane and adhesive technology, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problem that the solvent-free composite technology has not been substantially developed, and achieve green performance. , Adjustable performance, high bonding strength

Inactive Publication Date: 2014-05-28
新东方油墨有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The research on many foreign solvent-free polyurethane adhesives started early. As early as the 1970s, it had already emerged in the European flexible packaging market. The market is booming. According to rough statistics, the output of solvent-free composite membranes in Europe and the United States has accounted for more than 70% o

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of polyester polyol:

[0019] Put adipic acid, sebacic acid, isophthalic acid, methylpropanediol, and 1.2 propylene glycol into the reaction kettle with a molar ratio of OH:COOH==3.5:1, and gradually raise the temperature until all the water produced in the reaction is exhausted. , take a sample to measure the acid value of the reactant until it reaches the theoretical value; then carry out a vacuum reaction for 5 to 6 hours to remove unreacted small molecule polyols, and take samples for analysis when the number average molecular weight of the polyester polyol is between 1000 and 3000 Within the range, the reaction stops when the acid value is less than 1, and the polyester reaction ends.

[0020] Preparation of component A (main ingredient):

[0021] Mix polyester polyol and polyether polyol evenly in a mass ratio of 2:1, heat up to 105°C for vacuum dehydration for 1 hour, sample and analyze when the mass percentage of moisture is ≦0.05, add diphenylmetha...

Embodiment 2

[0029] Preparation of polyester polyol:

[0030] Put adipic acid, sebacic acid, isophthalic acid, methylpropanediol, 1.2 propylene glycol, and neopentyl glycol into the reactor according to the molar ratio OH:COOH==4:1, and gradually heat up until the reaction produces All the water has gone out, take a sample to measure the acid value of the reactant until it reaches the theoretical value; then carry out a 5-hour vacuum reaction to remove unreacted small molecule polyols, and take a sample analysis when the number-average molecular weight of the polyester polyol is 1000 In the range of ~3000, the reaction stops when the acid value is less than 1, and the polyester reaction ends.

[0031] Preparation of component A (main ingredient):

[0032] Mix the polyester polyol and polyether polyol prepared above in a mass ratio of 2:1, heat up to 100°C for vacuum dehydration for 1 to 2 hours, sample and analyze when the mass percentage of moisture is ≦0.05, add diphenyl Mix methane di...

Embodiment 3

[0040] Preparation of polyester polyol:

[0041] Put adipic acid, sebacic acid, phthalic anhydride, methylpropanediol, 1.2 propylene glycol, and 1.4 butanediol into the reaction kettle according to the molar ratio OH:COOH==5:1, and gradually raise the temperature until all the water produced in the reaction is After leaving, take a sample to measure the acid value of the reactant until it reaches the theoretical value; then carry out a vacuum reaction for 5 to 6 hours to remove unreacted small molecule polyols, and take samples for analysis when the number-average molecular weight of the polyester polyol is 1000 In the range of ~3000, the reaction stops when the acid value is less than 1, and the polyester reaction ends.

[0042] Preparation of component A (main ingredient):

[0043] Mix the above-mentioned polyester polyol and polyether polyol evenly in a mass ratio of 2:1, heat up to 100°C for vacuum dehydration for 2 hours, sample and analyze when the mass percentage of wa...

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PUM

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Abstract

The invention discloses a double-component solvent-free polyurethane adhesive and a preparation method thereof. The adhesive comprises a component A and a component B, wherein the component A comprises the following components in percentage by weight: 5-10% of polyether polyol, 30-40% of polyester polyol, 55-65% of isocyanate, 0.02-1% of a chain expander, 0.1-0.3% of a catalyst and 0.03-1% of an assistant. The component B comprises a uniform mixture of 60-80% of polyester polyol and 20-40% of polyether polyol. The adhesive disclosed by the invention has the advantages of adjustable performance, great binding strength, random adjustment of viscosity according to actual use and the like, and is a green and environment-friendly polyurethane adhesive which is excellent in performance.

Description

technical field [0001] The invention belongs to the field of adhesives for flexible packaging, and in particular relates to a two-component solvent-free polyurethane adhesive and a preparation method thereof. technical background [0002] Polyurethane adhesives contain a large number of polar groups in their molecules and have a large dipole moment, so they have a great affinity for the materials to be bonded, and can play a role in bonding a variety of materials; polyurethane adhesives have been fully tested The cross-linked curing has high cohesion, the film is tough and soft, and has good heat resistance and medium corrosion resistance, so its market application is quite extensive: the demand for similar adhesives in my country will increase by 9% per year. At that time, my country's adhesives will rank first in the world, and their sales will rank second in the world, but they are all solvent-based. With the gradual improvement of human environmental protection awareness a...

Claims

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Application Information

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IPC IPC(8): C09J175/06C08G18/76C08G18/75C08G18/73C08G18/67C08G18/42C08G18/48C08G18/32C08G63/181
Inventor 王太林郑芳高睿骁
Owner 新东方油墨有限公司
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