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Adhesive for solvent-free two-component polyurethane composite film and preparation method thereof

A two-component polyurethane and adhesive technology, which is applied in the field of polyurethane adhesive preparation, can solve the problems of low strength and inability to use, and achieve high peel strength and environmental friendliness

Active Publication Date: 2018-02-16
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the problems existing in the above-mentioned prior art, the present invention provides a solvent-free two-component polyurethane composite film adhesive and its preparation method, which can compound the composite film with cooking structure, so that the performance of the composite film can meet the requirements of cooking , to solve the problem that the NY / RCPP composite film cooking structure compounded with the existing solvent-free polyurethane adhesive has low strength after cooking and cannot be used

Method used

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Examples

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Effect test

preparation example Construction

[0027] The embodiment of the present invention also provides a method for preparing an adhesive for a solvent-free two-component polyurethane composite film, which is used to prepare the above adhesive, including:

[0028] Synthesize the component A which is terminated by isocyanate and the component B which is terminated by hydroxyl, and the adhesive for the solvent-free two-component polyurethane composite film is composed of the synthesized components A and B. In the adhesive, A and B are The functional group molar ratio of the two components is 1.2-2.0:1; among them,

[0029] Synthesis of isocyanate-terminated A-components is as follows:

[0030] Mix the polyisocyanate and the first component evenly, add phosphoric acid, keep it warm at 50-60°C for 2-3 hours, then raise the temperature to 80-90°C and keep it warm for 3-4 hours. The product is A component blocked by isocyanate; Wherein, the first component adopts at least one in polyether polyol, polyester polyol, castor o...

Embodiment 1

[0046] This embodiment provides a solvent-free two-component polyurethane composite film adhesive, its preparation method is as follows, including:

[0047] Synthesize component A terminated by isocyanate and component B terminated by hydroxyl, wherein,

[0048] Synthesis of isocyanate-terminated A-components is as follows:

[0049] Mix 100 parts by weight of 4.4-diphenylmethane diisocyanate with 80 parts by weight of polyoxypropylene diol with a molecular weight of 1000, 50 parts by weight of castor oil and 0.01 part by weight of phosphoric acid. Keep warm for 2 hours, then raise the temperature to 80-90°C and react for 3-4 hours. After detecting the NCO mass percentage, add a certain amount of carbodiimide-modified 2,4-xylene according to the detected NCO mass percentage. Methane diisocyanate, continue to stir for one hour, and the NCO mass percentage is 13% to 15%, which is qualified, and the material is discharged after passing, and the synthesized product is the isocyana...

Embodiment 2

[0054] This embodiment provides a solvent-free two-component polyurethane composite film adhesive, its preparation method is as follows, including:

[0055] Synthesize component A terminated by isocyanate and component B terminated by hydroxyl, wherein,

[0056] Synthesis of isocyanate-terminated A-components is as follows:

[0057] Mix 100 parts by weight of liquefied MDI with 80 parts by weight of polyoxypropylene diol with a molecular weight of 1000, 40 parts by weight of polyether triol with a molecular weight of 700, and 0.015 parts by weight of phosphoric acid. Keep warm for 2 hours, then raise the temperature to 80-90°C and react for 3-4 hours. After the NCO content is qualified, add a certain amount of carbodiimide-modified 2,4-xylenemethane diisocyanate according to the detected NCO content, and continue Stir for one hour, check that the NCO content is 13%-15%, then it is qualified, and the material is discharged after passing the test, and the synthesized product is...

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Abstract

The invention discloses an adhesive for a solvent-free two-component polyurethane composite film and a preparation method thereof. The adhesive is an isocyanate-terminated component A synthesized by reacting isocyanate, polyether polyol and polyester polyol. , composed of hydroxyl-terminated component B synthesized by the reaction of polyether polyol and isocyanate, wherein the functional group molar ratio of the two components A and B is 1.2-2.0:1. Methods include. First, mix polyisocyanate with polyether diol, polyether polyol and polyester polyol, add an appropriate amount of phosphoric acid, and heat up to form component A; mix polyether polyol with isocyanate and heat up to form component B, which is A, B two components are compounded into a solvent-free two-component polyurethane composite film adhesive. When the adhesive is used, the amount of gluing is small, the wettability of the substrate is good, the bonding strength is high, the application range is wide, safety and environmental protection, and no solvent emission. It can adapt to high temperature cooking at 121°C for 30 minutes.

Description

technical field [0001] The invention relates to the field of polyurethane adhesive preparation, in particular to an adhesive for a solvent-free two-component polyurethane composite film and a preparation method thereof. Background technique [0002] Due to the highly polar and chemically active carbamate groups (-NHCOO-) and isocyanate groups (-NCO) in polyurethane adhesives, it can be used with materials containing active hydrogen such as plastics, paper, metals and other smooth surfaces. All have excellent chemical adhesion. Composite flexible packaging is used in various fields of the national economy due to its superior performance and low price, such as food, beverage, medicine, cosmetics and electronic products. Composite flexible packaging is based on the performance needs of flexible packaging to carry out two or more layers of film together through adhesives. At present, most domestic flexible packaging manufacturers use solvent-based adhesives for dry lamination,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/14C09J175/08C09J175/06C08G18/67C08G18/48
Inventor 唐本鑫赫长生田立云
Owner BEIJING COMENS NEW MATERIALS
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