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Low-friction-coefficient and solvent-free type polyurethane adhesive and preparation method thereof

A polyurethane adhesive and low friction coefficient technology, applied in the field of polyurethane adhesive preparation, can solve the problems of high friction coefficient of composite film, composite film cannot be pulled, and can not be opened, so as to achieve good coating performance, wide application range, and reduce crystallinity Effect

Inactive Publication Date: 2017-03-22
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The friction coefficient of the composite film is high, and the friction force on the bag making machine is large, which will cause the composite film to be unable to pull, stretch seriously, and even make bag making difficult, or the soft packaging composite bag will become astringent and cannot be opened, which will cause troubles in the subsequent process.

Method used

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Examples

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preparation example Construction

[0036] The embodiment of the present invention also provides a method for preparing the above-mentioned low friction coefficient solvent-free polyurethane adhesive, comprising the following steps:

[0037] Prepare the modified polyester polyol of component A and the modified polyester polyol of component B respectively according to the formula of the above-mentioned adhesive;

[0038] Preparation of component A: Add polyisocyanate, keep the temperature of the kettle at 25-35°C, add the prepared modified polyester polyol, react at 70-80°C for 3-4 hours, and get component A when it is lowered to room temperature;

[0039] The prepared component A and component B are used in combination according to the functional group molar ratio: -NCO: -OH = (1.1-1.8): 1 to form the solvent-free polyurethane adhesive.

[0040] When two surfaces are in contact with each other, when they are at rest, a strong bonding force will be formed at the contact point between the two surfaces, which is th...

Embodiment 1

[0044] This example provides a solvent-free two-component polyurethane adhesive, which is composed of components A and B, wherein component A is formed by the reaction of modified polyester polyol and polyisocyanate, and is a modified Isocyanate adduct; B component is polyester polyol, which is a modified polyol;

[0045] Component A and component B can be combined to form the adhesive according to the molar ratio of functional groups: -NCO: -OH=1.54:1.0.

[0046] The preparation method of this adhesive comprises the following steps:

[0047] 1. Preparation of component A:

[0048] (1) prepare polyester polyol earlier, comprising:

[0049] (1) Raw materials: 0.5mol 2-methyl-2,4-pentanediol, 0.8mol 1,6-hexanediol, 0.8mol adipic acid, 0.2mol sebacic acid;

[0050] (2) Preparation steps:

[0051] Add all small molecule polyols (ie 0.5mol 2-methyl-2,4-pentanediol, 0.8mol1,6-hexanediol) in the polyester reactor and mix evenly to form a small molecule polyol mixture; heat up to ...

Embodiment 2

[0063] The embodiment of the present invention provides a solvent-free two-component polyurethane adhesive, which is composed of components A and B, wherein component A is formed by reacting polyester polyol and polyisocyanate, and is a modified isocyanate adducts; component B is polyester polyol, which is a modified polyol;

[0064] Component A and component B can be combined to form the adhesive according to the molar ratio of functional groups: -NCO: -OH=1.75:1.0.

[0065] The preparation method of this adhesive comprises the following steps:

[0066] 1. Preparation of component A:

[0067] (1) prepare polyester polyol, comprising:

[0068] (1) Raw materials: 0.8mol diethylene glycol, 0.2mol ethylene glycol, 0.5mol 1,2-propanediol, 1.0mol adipic acid;

[0069] (2) Preparation steps: refer to the step of preparing polyester polyol in the preparation of component A in Example 1;

[0070] Prepared polyester polyol with a hydroxyl value of 128 and an acid value of 0.8;

[...

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Abstract

The invention discloses low-friction-coefficient and solvent-free type polyurethane adhesive and a preparation method thereof and belongs to the field of polyurethane adhesive preparation. The adhesive is prepared from A component and B component, wherein the A component is prepared from modified polyester polyol and polyisocyanate which react with each other, and the B component is prepared from modified polyester polyol. By means of molecular design, the appropriate proportion of branched chain is introduced into the adhesive; thus, the regularity of the adhesive is reduced, a solidified adhesive layer of the adhesive has certain microcosmic unevenness, the microcosmic unevenness of a composite membrane is further obtained, the bonding force between surfaces is reduced, and the composite membrane has a low friction coefficient; as the branched chain is introduced into the adhesive, the crystalline of the molecular chain is reduced, the transparency of the adhesive is improved, the adhesive also can obtain lower viscosity and good coating performance, and the adhesive is wider in application range in the field of composite flexible package. The solvent-free adhesive has no solvent residue and is high in safety.

Description

technical field [0001] The invention relates to the field of polyurethane adhesive preparation, in particular to a low friction coefficient solvent-free polyurethane adhesive for composite flexible packaging in the fields of food, daily necessities, medicines and the like and a preparation method thereof. Background technique [0002] Solvent-free polyurethane adhesives for composite flexible packaging have outstanding environmental protection and safety, and at the same time have outstanding advantages such as low cost, low energy consumption, stable composite film quality, and high composite efficiency. It is used in all kinds of composite flexible packaging for food, daily necessities, medicines, agricultural products, industrial products, cosmetics, electronic products, etc. [0003] Solvent-free composite adhesives have been widely used. However, during the application of solvent-free adhesives, the problem of high friction coefficient of flexible packaging composite fi...

Claims

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Application Information

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IPC IPC(8): C09J175/06C08G18/42C08G18/10
Inventor 田立云赫长生
Owner BEIJING COMENS NEW MATERIALS
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