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Binding agent for solvent-free two-component polyurethane composite film, and preparation method for binding agent

A two-component polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of unusability and low strength, and achieve high peel strength and environmental friendly. Effect

Active Publication Date: 2015-12-02
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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preparation example Construction

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

[0028] The A component terminated by isocyanate and the B component terminated by hydroxyl group are synthesized respectively, and the two components A and B are synthesized. The solvent-free two-component polyurethane composite film adhesive is composed of A and B in the adhesive. The molar ratio of the functional groups of the two components is 1.2 to 2.0:1; wherein,

[0029] The way to synthesize isocyanate-terminated component A is as follows:

[0030] Mix the polyisocyanate and the first component evenly, add phosphoric acid, keep at 50-60°C for 2-3 hours, then heat up to 80-90°C for 3-4 hours and react for 3-4 hours. The product is the A component end-capped by isocyanate; wherein, the first component adopts at least one of polyether polyol, polyester...

Embodiment 1

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

[0047] The A component terminated by isocyanate and the B component terminated by hydroxyl are synthesized respectively, wherein,

[0048] The way to synthesize isocyanate-terminated component A is as follows:

[0049] Mix 100 parts by weight of 4.4-diphenylmethane diisocyanate, 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, first at 50 to 60° C. Incubate 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 it is qualified when the NCO mass percentage is 13% to 15%.

[0050] The manner for s...

Embodiment 2

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

[0055] The A component terminated by isocyanate and the B component terminated by hydroxyl are synthesized respectively, wherein,

[0056] The way to synthesize isocyanate-terminated component A 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, and firstly at 50~60 ℃ Incubate for 2 hours, then raise the temperature to 80-90°C and react for 3-4 hours. After testing the NCO content, add a certain amount of carbodiimide-modified 2,4-xylene methane diisocyanate according to the detected NCO content, and continue Stir for one hour, check that the NCO content is 13%-15%, that is, it is qualified, and after the quali...

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PUM

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Abstract

The invention discloses a binding agent for a solvent-free two-component polyurethane composite film, and a preparation method for the binding agent. The binding agent comprises an isocyanate-terminated component A and a hydroxy-terminated component B, wherein the component A is synthesized by enabling isocyanate to react with polyether polyol and polyester polyol, the component B is synthesized by enabling polyether polyol to react with isocyanate, and the functional group molar ratio of the component A to the component B is (1.2-2.0) : 1. The method comprises the following steps: firstly, mixing polyisocyanate with polyether glycol, polyether polyol and polyester polyol, adding an appropriate amount of phosphoric acid, and heating to realize reaction to generate the component A; secondly, mixing polyether polyol and isocyanate, and heating to generate the component B; finally, compounding the component A and the component B to obtain the binding agent for the solvent-free two-component polyurethane composite film. During use, the binding agent consumption is low, the wettability of a base material is good, and the bonding strength is high. The binding agent is wide in applicable range, safe, environmental-friendly, and free of solvent discharge, and can adapt to cooking for 30 min at 121 DEG C.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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