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Two-component polyurethane adhesive and preparation method thereof

A two-component polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem that the cold-formed aluminum is difficult to reach, the molecular weight is not high, and the ratio of the soft and hard segments of the adhesive is not high. Reasonable and other issues to achieve the effect of increasing medium resistance and strength, increasing ductility and wettability, and achieving strength and ductility

Active Publication Date: 2022-03-04
BEIJING HUATENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, most of the adhesives for cold-forming aluminum are polyurethane adhesives. However, due to the unreasonable ratio of hard and soft segments of the adhesive or the low molecular weight, it is difficult to meet the requirement of drawing depth greater than 5.5mm for cold-forming aluminum, and it is difficult to guarantee after the contents are filled. Effective mechanical strength and heat-sealing strength will also make the comprehensive ductility of cold-formed aluminum poor, and quality problems such as delamination, fracture, and rebound will occur during the stamping process or when folding and sealing edges

Method used

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  • Two-component polyurethane adhesive and preparation method thereof
  • Two-component polyurethane adhesive and preparation method thereof
  • Two-component polyurethane adhesive and preparation method thereof

Examples

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Embodiment 1-10

[0029] Embodiment 1-10 Two-component polyurethane adhesive and preparation method thereof

[0030] Examples 1-10 are respectively a two-component polyurethane adhesive and its preparation method, and the raw materials for making them are shown in Table 1-5, wherein, examples 1-10 all use two kinds of polyester polyols to show the difference , especially represented by polyester polyol A and polyester polyol B respectively, "A" and "B" have no practical technical meaning.

Embodiment 1

[0031] The preparation method of the two-component polyurethane adhesive of embodiment 1 carries out according to the following steps:

[0032] (1) Preparation of the main agent

[0033] 1) Preparation of polyester polyol A

[0034] ①Esterification reaction: Put isophthalic acid, terephthalic acid, neopentyl glycol, ethylene glycol, and antioxidants into the reactor, and nitrogen gas is introduced while heating up. After the reaction starts, the nitrogen gas is withdrawn and the temperature is raised. To 234°C, maintain the temperature for 3h;

[0035] ②Polycondensation reaction: add catalyst, maintain the reaction temperature of 234°C, and vacuumize the reaction kettle at a speed of -0.01MPa / 30min. After the vacuum degree in the kettle is increased from -0.01MPa to -0.1MPa, keep the temperature and pressure for 1.7h, that is A polyester polyol A having a hydroxyl value of 4.8 mgKOH / g and an acid value of <2 mgKOH / g with a relative molecular mass of 20,000 was obtained;

[...

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Abstract

The invention belongs to the field of adhesives, and specifically discloses a two-component polyurethane adhesive and a preparation method thereof. The raw materials for making the two-component polyurethane adhesive include 10 parts by weight of two kinds of polyester polyols, prepolymers and ethyl acetate The prepared main agent and 1 part by weight of a curing agent made of polyol, diisocyanate or polyisocyanate and ethyl acetate are prepared by mixing the main agent and the curing agent respectively. The two-component polyurethane adhesive provided by the invention can make the drawing depth after cold-forming aluminum composite reach 6-9 mm, and at the same time, make the cold-forming aluminum composite material have good heat sealing performance and medium resistance, and its preparation process is simple. The preparation method of the present invention is suitable for preparing two-component polyurethane adhesive, and the prepared two-component polyurethane adhesive is suitable for bonding substrates containing active hydrogen, and is especially suitable for bonding cold-formed aluminum composite packaging.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and relates to a two-component adhesive, in particular to a two-component polyurethane adhesive and a preparation method thereof. Background technique [0002] Cold forming aluminum is cold stamping into aluminum packaging film, which is a composite flexible packaging material composed of aluminum foil, various plastic films and adhesives (including adhesive resins). The barrier property can effectively avoid the damage of gas, light and other media to the inner packaging. Therefore, it is widely used in the packaging fields of medicine, food, health care products, lithium batteries and so on. This type of packaging needs to have good flexibility to meet the needs of cold press forming, and also needs to have high mechanical properties and heat sealing properties to meet the needs of safety during use. [0003] In the prior art, most of the adhesives for cold-forming aluminum are polyurethane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C08G18/42C08G18/12C08G18/72
CPCC09J175/06C08G18/4202C08G18/4211C08G18/12C08G18/72
Inventor 陈宇崔正王贤增张春辉韩航孙同兵杨波
Owner BEIJING HUATENG NEW MATERIAL CO LTD
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