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Solvent-free adhesive for high-wettability flexible packaging compounding and preparation method thereof

A high wettability, flexible packaging technology, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of ink discoloration, adhesive shrinkage appearance spots, poor wettability, etc., to reduce crystallization non-toxicity, avoid spots and bubbles, high miscibility effect

Active Publication Date: 2016-09-28
杨川
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the poor wettability of the existing solvent-free composite film adhesive to the aluminized film, aluminum foil and printing ink during the coating process, causing spots on the shrinkage appearance of the adhesive after compounding, and even the phenomenon of ink discoloration, the primary purpose of the present invention is to provide A safe, environmentally friendly, hygienic, solvent-free adhesive for high wettability flexible packaging that can be applied to substrates such as plastic and plastic, plastic and aluminized film, plastic and aluminum foil;

Method used

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  • Solvent-free adhesive for high-wettability flexible packaging compounding and preparation method thereof
  • Solvent-free adhesive for high-wettability flexible packaging compounding and preparation method thereof
  • Solvent-free adhesive for high-wettability flexible packaging compounding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of isocyanate-terminated prepolymer components:

[0031] Take 500g of polyoxypropylene diol DL-1000 and 200g of polyoxypropylene diol DL-400 and mix evenly, heat up to 120°C and turn on negative pressure vacuum dehydration, the negative pressure gradually increases from -0.01MPa to -0.08MPa , increase the pressure by 0.01MPa every 10 minutes, dehydrate for 1 hour after reaching -0.08MPa, cool down to 60°C, then add 500g of 2-4,4-4-diphenylmethane diisocyanate and react at 65°C for 3 hours to detect isocyanide Acid group content, when the isocyanate group content reaches 5%, add 333g isophorone diisocyanate, react at 80°C for 3 hours, continue to detect the isocyanate group content, when the isocyanate group content reaches 12.5 %-15% to stop the reaction to obtain the isocyanate-terminated prepolymer component;

[0032] It has been tested that the solid content of the isocyanate-terminated prepolymer component prepared through the above steps is 100%, th...

Embodiment 2

[0044] 1. Preparation of isocyanate-terminated prepolymer components:

[0045] Take 400g of polyoxypropylene diol DL-1000 and 240g of polyoxypropylene diol DL-400 and mix evenly, heat up to 120°C and turn on negative pressure vacuum dehydration, the negative pressure gradually increases from -0.01MPa to -0.08MPa , increase the pressure by 0.01MPa every 10 minutes, dehydrate for 1 hour after reaching -0.08MPa, cool down to 60°C, then add 500g of 2-4,4-4-diphenylmethane diisocyanate and react at 80°C for 3 hours to detect isocyanate Acid group content, when the isocyanate group content reaches 7%-8%, add 333g isophorone diisocyanate, react at 85°C for 3 hours, continue to detect the isocyanate group content, when the isocyanate group The reaction is stopped after the content reaches 12.5% ​​to 15%, and the isocyanate-terminated prepolymer component is obtained;

[0046] After testing, the solid content of the isocyanate-terminated prepolymer component prepared through the above...

Embodiment 3

[0058] 1. Preparation of isocyanate-terminated prepolymer components:

[0059] Take 500g of polyoxypropylene diol DL-1000 and 200g of polyoxypropylene diol DL-400 and mix evenly, heat up to 120°C and turn on negative pressure vacuum dehydration, the negative pressure gradually increases from -0.01MPa to -0.08MPa , increase the pressure by 0.01MPa every 10 minutes, dehydrate for 1 hour after reaching -0.08MPa, cool down to 60°C, then add 450g of 2-4,4-4-diphenylmethane diisocyanate and react at 75°C for 3 hours to detect isocyanate Acid group content, when the isocyanate group content reaches 5%-6%, add 377g isophorone diisocyanate, react at 85°C for 3 hours, continue to detect the isocyanate group content, when the isocyanate group Stop the reaction after the content reaches 12.5%-15%, and obtain the isocyanate-terminated prepolymer component;

[0060] It has been tested that the solid content of the isocyanate-terminated prepolymer component prepared through the above steps ...

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Abstract

The invention belongs to the technical field of high-polymer adhesives, and discloses a solvent-free adhesive for high-wettability flexible packaging compounding and a preparation method thereof. The adhesive is prepared by mixing an isocyanate-terminated prepolymer component and a hydroxy polyester polymer component according to the weight ratio of 100:50 at 45-55 DEG C. The mass percent of the isocyanic acid group in the isocyanate-terminated prepolymer component is 12.5-15%, and the viscosity at 25 DEG C is 3500-5500m Pa.s. The hydroxy polyester polymer component is formed by mixing a polyhydroxy polyester polymer and a high-efficiency leveling and wetting component polymer according to the weight ratio of (70-80):(20-30), the hydroxyl value is 150-200mg KOH / g, the functionality is 2.1-2.5, and the viscosity at 25 DEG C is 1500-3000m Pa.s. The adhesive prepared by the method enhances the bonding power with the composite substrate, and avoids spots and bubbles; the surface tension of the adhesive is lowered, so the adhesive has favorable wetting and leveling properties; and the adhesive reduces the generation of carcinogen aromatic amines, and thus, is environment-friendly and sanitary.

Description

technical field [0001] The invention belongs to the technical field of polymer adhesives, and in particular relates to a solvent-free adhesive for compounding flexible packaging with high wettability and a preparation method thereof. Background technique [0002] At present, in the composite processing of flexible packaging in my country, the dry composite process has always occupied a dominant position due to its outstanding advantages such as high composite fastness, strong process adaptability, and wide application range. However, a large amount of solvent-based adhesives and Thinner, not only the volatilization of the solvent will pollute the environment, but also the residual solvent in the packaging bag will pollute the food and have a negative impact on the health of consumers. Therefore, it is the only way for the sustainable development of flexible packaging enterprises to realize the greening of flexible packaging composite processing by using environmentally friend...

Claims

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Application Information

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IPC IPC(8): C09J175/06C08G18/76C08G18/75C08G18/48C08G18/66C08G18/61C08G18/32C08G18/64C08G63/668
CPCC08G18/4825C08G18/61C08G18/6415C08G18/6674C08G18/6685C08G18/755C08G18/7614C08G18/7671C08G63/668C09J175/06
Inventor 杨川魏仁兴
Owner 杨川
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