Preparation method of double-component non-solvent polyurethane adhesive used for food-grade packaging

A polyurethane adhesive and packaging technology, which is applied in the field of preparation of two-component solvent-free polyurethane adhesive, can solve problems such as hidden dangers of food safety, and achieve the effects of high safety, high degree of cross-linking, and reduced dependence.

Inactive Publication Date: 2015-12-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of food packaging, the commonly used organotin catalysts and aromatic isocyanates have also brought great hidden dangers to food safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of component A: Add 50 g of isophorone diisocyanate and 30 g of polyethylene glycol with a molecular weight of 400 after vacuum dehydration in sequence in the reaction kettle, stir under nitrogen protection, raise the temperature to 60°C, and take samples every 30 minutes. Measure its NCO content, stop stirring when the NCO mass fraction in the system no longer changes, cool down and discharge, and seal the package. The resulting A component NCO% = 16.4.

[0021] Preparation of component B: Add 0.1mol castor oil and 0.2mol glycerin after vacuum dehydration to a reaction kettle filled with nitrogen, stir and slowly raise the temperature to 180°C, alcoholyze under the catalysis of sodium hydroxide for 2 hours, and then add 0.12mol six Hydrophthalic anhydride and 30ul tetra-n-butyl titanate were esterified at 200°C for 8 hours until the acid value was lower than 5mgKOH / g and the hydroxyl value was 219mgKOH / g, cooled to room temperature and released for packagin...

Embodiment 2

[0024] Preparation of component A: Add 50g of isophorone diisocyanate and 56g of polytetrahydrofuran diol with a molecular weight of 1000 after vacuum dehydration in sequence in the reaction kettle, stir under nitrogen protection, raise the temperature to 50°C, and take samples every 30min. Measure its NCO content, stop stirring when the NCO mass fraction in the system no longer changes, cool down and discharge, and seal the package. The resulting A component NCO% = 14.9.

[0025] Preparation of component B: Add 0.1mol castor oil and 0.2mol glycerin after vacuum dehydration to a reactor filled with nitrogen, stir and slowly raise the temperature to 220°C, alcoholyze under the catalysis of sodium hydroxide for 1.5h, and then add 0.13mol Hexahydrophthalic anhydride and 30ul tetra-n-butyl titanate were esterified at 220°C for 6 hours until the acid value was lower than 5mgKOH / g and the hydroxyl value was 210mgKOH / g, cooled to room temperature and released for packaging.

[0026]...

Embodiment 3

[0028] Preparation of component A: Add 50 g of dicyclohexylmethane diisocyanate and 38 g of polypropylene glycol with a molecular weight of 600 after vacuum dehydration in sequence, stir under nitrogen protection, raise the temperature to 60°C, take samples every 30 minutes, and measure the NCO content, stop stirring when the NCO mass fraction in the system no longer changes, cool down and discharge, and seal the package. The resulting A component NCO% = 13.5.

[0029] Preparation of component B: Add 0.2mol castor oil and 0.4mol glycerin after vacuum dehydration to a reactor filled with nitrogen, stir and slowly raise the temperature to 180°C, alcoholyze under the catalysis of sodium hydroxide for 2.5h, and then add 0.22mol Hexahydrophthalic anhydride and 50ul tetra-n-butyl titanate were esterified at 180°C for 10 hours until the acid value was lower than 5mgKOH / g and the hydroxyl value was 223mgKOH / g, cooled to room temperature and released for packaging.

[0030] Weigh comp...

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PUM

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Abstract

The invention discloses a preparation method of a double-component non-solvent polyurethane adhesive used for food-grade packaging. The polyurethane adhesive is prepared from an end NCO component A and a component B, wherein the component A is prepared from aliphatic diisocyanate and end-OH polyether polyol, and the component B is castor oil-based polyester polyol which is prepared from castor oil, glycerin and hexahydro-phthalic anhydride in an ester exchange and esterification reaction mode, and the two components are proportioned according to NCO / OH functional groups. Solvent and organic tin catalysts are not used, the polyurethane adhesive does not contain benzene ring components, the vegetable oil is introduced to reduce dependency on petroleum polyhydric alcohol, and the polyurethane adhesive is safe, environmentally friendly, free of pollution and capable of meeting the compositing requirement of a food packaging composite film and has excellent adhesive performance.

Description

technical field [0001] The invention relates to the field of polyurethane adhesives for food-grade flexible packaging, in particular to a preparation method of a two-component solvent-free polyurethane adhesive. Background technique [0002] Composite films for flexible packaging are generally composed of two, three or even multiple layers of films of different materials, and their quality depends on the films and adhesives used for compounding. Polyurethane adhesives occupy a dominant position in composite adhesives because of their strong cohesive force, transparency, softness, oil resistance, acid resistance, and high and low temperature resistance. Most of the polyurethane adhesives currently used in China are solvent-based two-component polyurethane adhesives, the general working concentration is about 30%, and most of the solvents used are ethyl acetate. Every time 1 ton of dry glue is used, more than 2 tons of ethyl acetate will be discharged into the air, which seri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C08G18/67C08G18/66C08G18/48C08G18/32C08G18/22
Inventor 张萍波王宇奇范明明蒋平平
Owner JIANGNAN UNIV
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