Solventless polyurethane adhesive and method for paper plastic packaging

A polyurethane adhesive, solvent-free technology, applied in the direction of adhesive additives, non-polymer adhesive additives, etc., can solve the problem of high cost of hot melt adhesives, and achieve the effects of cost saving, fast curing speed, and strong adaptability

Inactive Publication Date: 2013-06-05
SHANGHAI CHAOSU NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the defects of the high cost of the hot melt adhesive used in the pre-coating film coating process in the prior art, and to improve the flex resistance of the pre-coating film coating, the present invention provides a new solvent-free Polyurethane Adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First synthetic special polyester polyol A, the composition of this polyester polyol A is as follows:

[0031] Adipic acid: 47%

[0032] Isophthalic acid: 3.9%

[0033] Diethylene glycol: 32%

[0034] 2-Methyl-1,3-propanediol: 10%

[0035] Neopentyl glycol 7.1%

[0036] The obtained polyester polyol A has a molecular weight of 850, a moisture content of 300ppm, and an acid value of 1.2

[0037] Then through the following formula design, the composition is as follows:

[0038] Polyester polyol A33.5%

[0039] Polyether polyol (molecular weight 1000) 20%

[0040] Polyether polyol (molecular weight 2000) 15%

[0041] 4,4'-Diphenylmethane diisocyanate (MDI) 30%

[0042] Anilinomethyltriethoxysilane: 1%

[0043] 1,4-Butanediol 0.48%

[0044] Bis(2,2-morpholine ethyl) ether 0.02%

[0045] The preparation process is as follows:

[0046] a. Ensure that the moisture content of polyester and polyether polyols is less than 350ppm, and the maximum cannot exceed 1000ppm,...

Embodiment 2

[0053] First synthetic special polyester polyol B, the composition of this polyester polyol B is as follows:

[0054] Adipic acid: 45%

[0055] Isophthalic acid: 10.2%

[0056] Diethylene glycol: 18%

[0057] 2-Methyl-1,3-propanediol: 20.6%

[0058] Neopentyl glycol 5.9%

[0059] 1,6-Hexanediol 0.3%

[0060] Then through the following formula design, the composition is as follows:

[0061] Polyester polyol B23.5%;

[0062] Polyether polyol (molecular weight 1000, ethylene oxide (EO) content is 15%) 22%;

[0063] Polyether polyol (molecular weight 3000) 20%;

[0064] 4,4'-Diphenylmethane diisocyanate (MDI) 34%;

[0065] γ-glycidyl etheroxypropyl trimethoxysilane: 0.5%;

[0066] Stannous octoate 0.005%

[0067] The preparation process is as follows:

[0068] a. Ensure that the moisture content of polyester and polyether polyols is less than 350ppm, and the maximum cannot exceed 1000ppm, and take necessary measures to remove moisture;

[0069] b Add polyester polyol A...

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PUM

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Abstract

The invention relates to the technical field of polyurethane adhesives, particularly a solventless polyurethane adhesive for a paper plastic packaging precoating technique, which is composed of 95-99 wt% of polyurethane prepolymer with isocyanate-terminated main chain and 1-5 wt% of additive. The coating weight of the adhesive is 2-8 g/m<2>. The polyurethane solventless adhesive provided by the invention has favorable bonding force for paper, films, aluminum foils and the like, has the advantages of no pollution and easy coating in construction, saves the cost, has high curing speed after precoating, and has strong adaptability to presswork; and after the adhesive is coated on the presswork, the presswork does not fade or form a film, and can resist deflection. The invention is widely used for paper plastic packaging.

Description

[technical field] [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a solvent-free polyurethane adhesive used in the pre-coating film process of paper-plastic packaging and a method. [Background technique] [0002] Post-press lamination, also known as lamination and lamination, is a form of decorative processing on the surface of paper after printing. It mainly refers to pasting the plastic film (polypropylene, etc.) and the surface of the printed product with an adhesive with a thickness of 12-20um (the thickness of the polyurethane adhesive is about 4um) through a laminating machine to form a paper-plastic product. Processing Technology. [0003] The early lamination process was through the oily solvent-based glue, and the ready-to-coat lamination process was adopted. Since the organic solvents such as toluene are harmful to the human body and seriously pollute the environment, it was gradually changed to a water-based glue i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C09J11/06C08G18/76C08G18/67C08G18/48C08G18/42C08G18/32
Inventor 陈先阔
Owner SHANGHAI CHAOSU NEW MATERIAL TECH CO LTD
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