Solvent-free two-component polyurethane laminating adhesive and preparation method thereof

A two-component polyurethane, solvent-free technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve packaging bag air leakage, wrinkling of heat-sealed edges, insufficient heat resistance of colloids, etc. problem, to achieve the effect of no VOC emission, environmental friendliness and good appearance

Inactive Publication Date: 2020-01-31
BEIJING JINGDU DACHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, most of the goals are achieved by incomplete curing of the adhesive, but incomplete curing will cause insufficient heat resistance of the colloid, and wrinkling of the heat-sealed edge will occur during the bag-making process and the produced The packaging bag is prone to air leakage

Method used

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  • Solvent-free two-component polyurethane laminating adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of component A: 25Kg of 2,4'-diphenylmethane diisocyanate and 25Kg of 4,4'-diphenylmethane diisocyanate and 4Kg of carbodiimide-modified 4,4'-diphenyl Methyl methane diisocyanate and 20Kg of polyether diol with an average molecular weight of 1000 and 26Kg of polyether diol with an average molecular weight of 2000 were evenly mixed, then heated up to 85°C and kept for 2.5 hours to obtain an NCO mass fraction of 15 % - 15.5% of Component A.

[0028] The preparation of polyester diol with an average molecular weight of 500: 45Kg of adipic acid, 15Kg of 2-methyl 1,3-propanediol and 40Kg of diethylene glycol were added to the polyester kettle, stirred evenly, Continue to add 0.5Kg of triphenyl phosphite as an antioxidant and 0.05Kg of tetra-n-butyl titanate as a catalyst. After esterification and polycondensation, the average molecular weight of hydroxyl value between 210-220mgKOH / g is 500 of polyester diols.

[0029] Preparation of component B: 55Kg of polyeth...

Embodiment 2

[0032] Preparation of component A: 26Kg of 2,4'-diphenylmethane diisocyanate and 26Kg of 4,4'-diphenylmethane diisocyanate and 20Kg of polyether diol with an average molecular weight of 1000 and 28Kg of After the polyether diols with an average molecular weight of 2000 are mixed evenly, the temperature is raised to 8° C. and the reaction is kept for 3 hours to obtain component A with an NCO mass fraction of 15%-15.5%.

[0033] The average molecular weight is the preparation of the polyester diol of 500: the adipic acid of 38Kg, the isophthalic acid of 8Kg, the 2-methyl 1 of 36Kg diethylene glycol and 18Kg 1,3-propanediol are added to poly In the ester kettle, stir evenly, continue to add 0.5Kg of triphenyl phosphite as an antioxidant, and 0.03Kg of tetra-n-butyl titanate as a catalyst. After esterification and polycondensation, the hydroxyl value is 210-220mgKOH / g Polyester diols with an average molecular weight of 500.

[0034] Preparation of component B: Mix 60Kg of polyeth...

Embodiment 3

[0037] Preparation of component A: 26Kg of 2,4'-diphenylmethane diisocyanate, 26Kg of 4,4'-diphenylmethane diisocyanate and 6Kg of carbodiimide-modified 4,4'-diphenyl Methyl methane diisocyanate and 15Kg of polyether diol with an average molecular weight of 1000 and 30Kg of polyether diol with an average molecular weight of 2000 are uniformly mixed, then heated up to 90°C and incubated for 2 hours to obtain an NCO mass fraction of 15 % - 15.5% of Component A.

[0038]The average molecular weight is the preparation of the polyester diol of 500: the adipic acid of 38Kg, the isophthalic acid of 8Kg, the 2-methyl 1,3-propanediol of the diethylene glycol of 38Kg and 16Kg are added to poly In the ester kettle, stir evenly, continue to add 0.5Kg of triphenyl phosphite as an antioxidant, and 0.04Kg of tetra-n-butyl titanate as a catalyst. After esterification and polycondensation, the hydroxyl value is 210-220mgKOH / g Polyester diols with an average molecular weight of 500.

[0039] ...

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Abstract

The invention relates to a solvent-free two-component polyurethane laminating adhesive and a preparation method thereof. The solvent-free two-component polyurethane laminating adhesive comprises a component A and a component B, wherein the component A is prepared by carrying out polymerization reaction on a homogeneous mixture containing polyisocyanate, polyether glycol with the average molecularweight of 1000 and polyether glycol with the average molecular weight of 2000; the component B is a homogeneous mixture comprising a polyether triol having an average molecular weight of 1000, a polyester diol having an average molecular weight of 500, and a polyether triol having an average molecular weight of 3000. According to the method, BOPP and CPP are compounded; after the BOPP / CPP composite film is completely cured, the T-shaped peel strength is 1.2-1.4 N / 15mm, the T-shaped peel strength is attenuated by 5%-8% after seven days, the BOPP / CPP composite film is good in heat resistance, hot sealing edge wrinkling does not occur during bag making, and a made packaging bag is not prone to air leakage.

Description

technical field [0001] The invention relates to a polyurethane adhesive suitable for composite flexible packaging, more specifically, it relates to a solvent-free two-component polyurethane laminating adhesive and a preparation method thereof. Background technique [0002] With the vigorous development of the commodity economy, a large number of industrial products, household daily necessities, food, medicines, etc. use plastic flexible packaging. People's daily life has been inseparable from various, beautiful and durable composite flexible packaging products. At the same time, the increasing variety of flexible packaging materials and the continuous improvement of processing technology make it play an increasingly important role in many fields. The core technology of composite flexible packaging processing is to laminate and bond together plastic films, metal films or papers that can achieve different functions through the bonding effect of various adhesives (laminating ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/08C09J175/06C08G18/48C08G18/42C08G18/76C08G18/79
CPCC08G18/4018C08G18/42C08G18/4812C08G18/725C08G18/7671C08G18/797C09J175/04C09J175/06C09J175/08
Inventor 罗俊赵寅建吕嘉东逄志玲
Owner BEIJING JINGDU DACHENG CHEM
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