Single-component solvent-free polyurethane adhesive for paper-plastic compounding and preparation method of single-component solvent-free polyurethane adhesive
A solvent-free polyurethane and paper-plastic composite technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problem of being unable to adapt to long-term high temperature and high humidity, not involving the durability of adhesives, and performance degradation and other problems, to achieve excellent peel strength, excellent durability, and improve the effect of adhesion
Active Publication Date: 2022-07-22
JIANGSU HUADA NEW MATERIAL CO LTD
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Problems solved by technology
[0004] Chinese patent CN107163895A discloses a single-component polyurethane adhesive for paper-plastic composite, which is prepared by reacting crystalline polyester polyol, amorphous polyester polyol, polyether polyol and chain extender with isocyanate. It is used in the lamination of various paper and film, but the durability of the adhesive is not mentioned in the document. Under some long-term high temperature and high humidity conditions, the paper and the substrate in the packaging film are often easy to separate, making this paper plastic Significantly reduced performance of packaging materials
Although the durability has been improved to a certain extent, it still cannot adapt to the conditions of long-term high temperature and high humidity
Method used
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Embodiment 1
[0035] The single-component solvent-free polyurethane adhesive for paper-plastic compounding provided by this embodiment, the preparation method thereof comprises the following steps:
[0036] 1) Weigh 5 parts by weight of PEG 1000, 22 parts by weight of PEG 2000, 10 parts by weight of PPG 400, 8 parts by weight of poly-1,4-butanediol adipate diol (molecular weight 1000), 9 Parts by weight of polyneopentyl adipate-1,6-hexanediol ester diol (molecular weight 1500), 15 parts by weight of polycarbonate diol UH-200 (molecular weight 2000), 8 parts by weight of polybutylene Diene glycol (molecular weight 2000) and 0.01 weight part of dibutyltin dilaurate are put into the reaction device, be heated to 110 ℃, turn on stirring and vacuumize, make the water content of the mixture in the reaction device drop below 0.03%;
[0037] 2) Lower the temperature to 70°C, add 22 parts by weight of diphenylmethane diisocyanate, and control the reaction temperature at 70°C for 2.5 hours, so that t...
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Abstract
The invention relates to a single-component solvent-free polyurethane adhesive for paper-plastic compounding and a preparation method thereof, the raw materials of the adhesive comprise a polyol component, isocyanate, a catalyst and a coupling agent, the polyol component comprises a combination of polyester glycol, polyether glycol and polyolefin glycol according to a mass ratio of (30-50): (25-50): (5-10), and the coupling agent is a combination of at least one of N-beta-(aminoethyl)-gamma-aminopropyl trimethoxy silane and gamma-glycidoxypropyl trimethoxy silane, and gamma-aminopropyl triethoxy silane. The polyurethane adhesive disclosed by the invention can be used for compounding paper and various base materials, has excellent peel strength and durability, is basically not attenuated in peel strength after 6 months, and is suitable for long-term use under high-temperature and high-humidity conditions.
Description
technical field [0001] The invention belongs to the technical field of adhesive preparation, in particular to a single-component solvent-free polyurethane adhesive used for paper-plastic composite and a preparation method thereof. Background technique [0002] Paper is a traditional packaging material, and it is also one of the most widely used substrates for flexible packaging materials. As the base material of flexible packaging materials, paper is often used in combination with plastic, aluminum foil and other materials in order to make up for its own shortcomings such as poor oxygen and moisture resistance and poor water resistance. This kind of paper-plastic composite-based flexible packaging material has the advantages of good foldability and low price, and is widely used in food packaging, hardcover books and other fields. [0003] Paper-plastic lamination is to use adhesive to laminate PET film, BOPP film, PVC film and other film materials with paper. In the prior ...
Claims
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IPC IPC(8): C09J175/14C08G18/69C08G18/48C08G18/44C08G18/42C08G18/28C08G18/12
CPCC09J175/14C08G18/4808C08G18/4238C08G18/4202C08G18/4018C08G18/44C08G18/698C08G18/12C08G18/289C08G18/2805
Inventor 倪旭张泽绮
Owner JIANGSU HUADA NEW MATERIAL CO LTD