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Single-ingredient solvent-free type polyurethane bonding agent, and preparation method and application thereof

A polyurethane adhesive, solvent-free technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of transparency, unsatisfactory initial adhesive bonding strength, etc., and achieve production process safety Controllable, easy to obtain raw materials, simple composition effect

Inactive Publication Date: 2017-06-23
SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the one-component polyurethane adhesives currently on the market are not satisfactory in terms of transparency, initial tack, and bonding strength. It is necessary to explore a better one-component polyurethane adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the one-component solvent-free polyurethane adhesive of the present invention includes: mixing the alcohol compound containing active hydrogen and isocyanate evenly, controlling the temperature between 70-90°C until the reaction is complete, and then optionally adding Additives, stir well, that is.

[0025] In a preferred embodiment, the water content of the alcohol compounds containing active hydrogen is less than 500ppm. When the excess is exceeded, conventional methods can be used to remove moisture.

[0026] The invention also provides the application of the one-component solvent-free polyurethane adhesive in paper / plastic and paper / aluminum composites. When used, the one-component solvent-free polyurethane adhesive is applied to paper, plastic or aluminum in paper / plastic, paper / aluminum composites, or both on the materials to be bonded, and then the materials are bonded.

[0027] As a preferred solution, a method for applying the one-co...

Embodiment 1

[0044] The preparation of polyester polyol 1: mix it by mass ratio phthalic anhydride: neopentyl glycol=52%:48%, obtain acid value 0.6mg KOH / g by polycondensation reaction, hydroxyl value 130mg KOH / g, water content 120ppm polyester polyol with a chroma of 25. Its number average molecular weight is about 850.

[0045] Preparation of polyester polyol 2: mix it according to the mass ratio of adipic acid: 1,6-hexanediol=51%:49%, and obtain an acid value of 0.5 mg KOH / g through polycondensation reaction, and a hydroxyl value of 40 mg KOH / g, a polyester polyol with a water content of 140ppm and a chroma of 30. Its number average molecular weight is about 2800.

[0046] All other raw materials are commercially available.

[0047] According to the mass ratio of polyester polyol 1: polyester polyol 2: PPG2000 (polypropylene glycol 2000): 4,4'-diphenylmethane diisocyanate = 2:1:7:4 to mix them, control the temperature at 80 ° C After reacting for 2 hours, cool down to 70°C, add 0.0...

Embodiment 2

[0050] Get polyester polyol 1 and polyester polyol 2 prepared in embodiment 1 to carry out following preparation.

[0051] According to the mass ratio of polyester polyol 1: polyester polyol 2: 1,6-hexanediol: PPG2000: 4,4'-diphenylmethane diisocyanate = 2:3:0.05:5:3 to mix it, Control the temperature at 80°C for 2 hours, lower the temperature to 70°C, add 0.005% stannous octoate and 0.5% γ-glycidyloxypropyltrimethoxysilane, stir for 20 minutes, discharge, and vacuum seal for storage. The obtained adhesive was visually observed as a colorless to light yellow and transparent viscous liquid.

[0052] Paper / aluminum compounding: inject the synthesized one-component solvent-free polyurethane adhesive into the glue tank after heating, set the temperature of the metering roller to 85°C, the temperature of the transfer roller to 85°C, and the temperature of the glue roller to 85°C. The temperature of the pressing roller is 40°C; the ambient temperature is controlled at 28°C, the rel...

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Abstract

The invention relates to the technical field of a polyurethane bonding agent, in particular to a single-ingredient solvent-free type polyurethane bonding agent, and a preparation method and application thereof. The single-ingredient solvent-free type polyurethane bonding agent is prepared from isocyanate terminated polyurethane prepolymers and optional additives; the isocyanate terminated polyurethane prepolymers are prepared from alcohol compounds containing reactive hydrogen and isocyanate through chain expansion reaction. The single-ingredient solvent-free type polyurethane bonding agent provided by the invention has the advantages that the raw materials can be easily obtained; the composition is simple; the production process is safe and controllable; good transparency, primary stickiness and bonding intensity are realized; the single-ingredient solvent-free type polyurethane bonding agent can be widely used in paper / plastic and paper / aluminum compounding.

Description

technical field [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a one-component solvent-free polyurethane adhesive and its preparation method and application. Background technique [0002] At present, most food packaging is packaged in plastic film with good plasticity, but the texture of plastic film is relatively soft, which cannot protect some fragile foods that are afraid of pressure, and has poor stiffness. Paper / plastic and paper / aluminum composite films have good printability, barrier properties and stiffness, and are widely used in packaging materials to protect the contents well. In addition, paper / plastic and paper / aluminum composite films are also widely used in hardcover books, decorative building materials, etc., making the surface of printed matter smoother and brighter, full of three-dimensional effect, and also play a role in moisture-proof, anti-fouling, anti-counterfeiting, folding resistance, and durability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/42C08G18/48C08G18/66C08G18/32
CPCC09J175/06C08G18/3206C08G18/4018C08G18/4202C08G18/4211C08G18/4238C08G18/4825C08G18/664C09J175/08
Inventor 周敏胡洪国赵勇刚
Owner SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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