Steam-resistant solvent-free laminating adhesive and preparation method thereof

A solvent-free, cooking-resistant technology, applied in the direction of adhesive types, adhesives, polyurea/polyurethane adhesives, etc., can solve the problems of low initial viscosity, high viscosity, low bonding strength, etc., to improve heat resistance And the effect of water repellency, high bond strength and fast compounding speed

Active Publication Date: 2012-07-25
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solvent-free laminating adhesive has so many advantages, it encounters many problems in popularization and application. This is because the solvent-free laminating adhesive does not contain solvents, so the viscosity is relatively high, and it needs to be applied at a higher temperature. , otherwise it is not easy to coat evenly, and has the disadvantages of low initial viscosity, corrosion resistance of contents and unsatisfactory cooking resistance. In addition to producing high-quality solvent-free laminating adhesive technology, the application of this technology in developing countries is not common enough
Since 1995, my country has introduced dozens of sets of solvent-free composite equipment for the production of flexible packaging composite materials, but most of the solvent-free composite adhesives used are imported products. Promotion and Application of Composite Materials
At present, the solvent-free laminating adhesive developed in China is basically a two-component polyurethane composite adhesive. Most of them have disadvantages such as high viscosity, uneven coating, insufficient coating amount, and unsatisfactory medium resistance and cooking resistance. When compounding a large area of ​​printing film or printing with different types of inks, the composite film has an uneven surface, and the composite layer is often prone to voids, white spots or even delamination.
In order to ensure that the laminating adhesive has good coating performance, it is necessary to reduce the viscosity of the laminating adhesive. From the published information, it can be seen that most developers use the method of reducing the molecular weight of the resin used in the laminating adhesive, but the laminating adhesive contains The smaller the relative molecular weight of the resin, the lower its bonding strength (especially the initial viscosity), especially the poorer bonding performance to plastic films and metal foils deposited on metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Raw materials, ratio and process of component A:

[0028]Raw materials and proportioning: polytetrahydrofuran diol (molecular weight 1500) 100g, refined castor oil polyol (hydroxyl value 162mgKOH / g) 100g, liquefied MDI 110g;

[0029] Process: Vacuum dry polytetrahydrofuran diol and refined castor oil polyol at 105°C-120°C and a vacuum degree of 0.05-0.09MPa for 1-2 hours, so that the water content of the polyol is less than 0.05%, and then cool down to 50℃~60℃, add liquefied MDI and increase the stirring speed to fully mix with polyols, and at the same time pass through industrial nitrogen protection, then raise the temperature to 70℃~90℃ and react for 2 to 4 hours to form isocyanate-terminated polyurethane prepolymer body;

[0030] Properties of component A: It is a clear, transparent viscous liquid at room temperature, and its viscosity is 1800cP at 60°C.

[0031] 2. Raw materials, ratio and process of component B:

[0032] Raw materials and proportioning: Refin...

Embodiment 2

[0043] 1. Raw materials, ratio and process of component A:

[0044] Raw materials and proportioning: 1,4-butylene adipate (molecular weight 1000) 100g, refined castor oil polyol (hydroxyl value 162mgKOH / g) 100g, liquefied MDI 80g, IPDI 20g;

[0045] Process: Vacuum-dry 1,4-butylene adipate and refined castor oil polyol at 105°C-120°C and vacuum degree of 0.05-0.09MPa for 1-2 hours, so that the content of polyol The water content is less than 0.05%, then lower the temperature to 50°C-60°C, add liquefied MDI and IPDI and increase the stirring speed to fully mix with polyols, and at the same time pass through industrial nitrogen protection, and then heat up to 70°C-90°C to react for 2-4 hours, generate isocyanate-terminated polyurethane prepolymer;

[0046] Properties of component A: It is a clear, transparent viscous liquid at room temperature, and its viscosity is 1500cP at 60°C.

[0047] 2. Raw materials, ratio and process of component B:

[0048] Raw materials and proporti...

Embodiment 3

[0059] 1. Raw materials, ratio and process of component A:

[0060] Raw materials and proportioning: polytetrahydrofuran diol (molecular weight 1500) 100g, poly-1,4-butylene adipate (molecular weight 1000) 100g, soybean oil polyol (hydroxyl value 130mgKOH / g) 200g, IPDI 210g;

[0061] Process: vacuum-dry polytetrahydrofuran diol, poly-1,4-butylene adipate, and soybean oil polyol for 1 to 2 hours at a temperature of 105°C to 120°C and a vacuum degree of 0.05 to 0.09MPa to make The water content of the polyol is less than 0.05%, then lower the temperature to 50°C-60°C, add IPDI and increase the stirring speed to fully mix with the polyol, and at the same time pass through industrial nitrogen protection, and then raise the temperature to 70°C-90°C to react 2 ~4 hours to generate isocyanate-terminated polyurethane prepolymer;

[0062] Properties of component A: It is a clear, transparent viscous liquid at room temperature, and its viscosity is 1500cP at 60°C.

[0063] 2. Raw mate...

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Abstract

The invention provides steam-resistant solvent-free laminating adhesive applicable to compound soft package, which comprises a component A and a component B. The component A is isocyanate terminated polyurethane polymer formed by reacting polyhydroxy compound and polyisocyanate terminated compound. The component B is formed by mixing more than one type of plant oil polyalcohol, curing accelerator and synthetic modifier. The polyhydroxy compound in component A is formed of polyester polyol and / or polyether polyol with more than two degrees of functionality and a molecular weight range of from 600-2000, and more than one type of plant oil polyalcohol. The curing accelerator in the component B is formed of small molecular polyalcohol with more than two degrees of functionality. The synthetic modifier is formed by reacting more than one type of silane coupling agent and polyalcohol. The steam-resistant solvent-free laminating adhesive is low in viscosity and fast in curing speed, has high peel strength after boiled in water at 100 DEG C, and is especially suitable for soft packages requiring long-term high temperature sterilization (such as soft packages for foods, drugs and baby products). The invention further provides a preparation method of the steam-resistant solvent-free laminating adhesive.

Description

technical field [0001] The invention relates to an adhesive, in particular to a laminating adhesive suitable for composite flexible packaging, and more particularly to a retort-resistant solvent-free laminating adhesive suitable for composite flexible packaging. The invention also relates to a preparation method of the cooking-resistant solvent-free laminating adhesive. Background technique [0002] For a long time, solvent-based polyurethane laminating adhesives have been widely used in the composite flexible packaging industry, especially in China. However, because organic solvents are flammable, explosive, volatile, smelly, pollute the environment and are toxic, as people pay more and more attention to the hygiene and safety of packaging materials and environmental protection, green and environmentally friendly solvent-free laminating films Glue as a substitute for solvent-based laminating adhesives has attracted more and more attention. Solvent-free laminating adhesive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/06C09J11/00C08G18/67
Inventor 陈广学陈蓬生阎晋陈奇峰陈双莲贾春江段华伟
Owner SOUTH CHINA UNIV OF TECH
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