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Preparation method of dual-component solvent-free type polyurethane adhesive for composite flexible packaging

A technology of polyurethane adhesives and adhesives, applied in the direction of polyurea/polyurethane adhesives, adhesive types, packaging, etc., can solve the problems of increased packaging costs, organic solvent food safety issues, environment, pollution, etc., to achieve Reduce dependence on petroleum resources, increase crosslinking density and bond strength, and easily obtain raw materials

Inactive Publication Date: 2013-05-15
ZHEJIANG HUABAO INK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic food flexible packaging composite film industry mostly uses solvent-based adhesives. The use of a large amount of organic solvents can easily cause food safety problems and environmental pollution, and lead to increased packaging costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of component A: In the reaction kettle, add 100 parts of PPG (molecular weight about 400), 5 parts of castor oil, 2 parts of sorbitol and 0.4 part of stannous octoate in proportion, stir, and heat up to 80 °C. Vacuum at 1kPa for about 1 hour to dehydrate. When the water mass percentage is less than 0.05%, stop stirring, cool to room temperature, discharge, and seal the package. The obtained component A had a hydroxyl value of 302 mgKOH / g and a viscosity (25°C) of 920 mPa·s.

[0031] Preparation of component B: add 100 parts of castor oil and 160 parts of IPDI to the reaction kettle, stir, vacuumize for about 1 hour at a vacuum of about 1kPa to dehydrate, then add 1.0 parts of stannous octoate and 0.2 parts of Sanya under the condition of nitrogen protection Ethylenediamine, heat up to 80°C, react for 1 hour, then take samples every 30 minutes, measure the NCO content, stop the reaction when the NCO content is constant, cool to room temperature, discharge, an...

Embodiment 2

[0034] Preparation of component A: In the reaction kettle, add 100 parts of PPG (molecular weight about 1000), 30 parts of castor oil, 8 parts of xylitol and 1.0 part of stannous octoate in proportion, stir, and heat up to 60 °C. Vacuum at 1 kPa for about 3 hours to dehydrate. When the water mass percentage is less than 0.05%, stop stirring, cool to room temperature, discharge, and seal the package. The obtained component A had a hydroxyl value of 222 mgKOH / g and a viscosity (25°C) of 1510 mPa·s.

[0035] Preparation of component B: add 100 parts of castor oil and 70 parts of MDI to the reaction kettle, stir, vacuumize for about 3 hours at a vacuum of about 1kPa to dehydrate, then add 0.4 parts of stannous octoate and 0.5 parts of Sanya under the condition of nitrogen protection Ethylenediamine, heat up to 60 °C, react for 1 hour, then take samples every 30 minutes, measure the NCO content, stop the reaction when the NCO content is constant, cool to room temperature, discharge...

Embodiment 3

[0038] Preparation of component A: In the reactor, add 100 parts of PEG (molecular weight about 600), 15 parts of castor oil, 5 parts of mannitol and 0.6 part of stannous octoate in proportion, stir, heat up to 70 ℃, and vacuum at about 1 Vacuumize at kPa for about 2 hours to dehydrate. When the water mass percentage is less than 0.05%, stop stirring, cool to room temperature, discharge, and seal the package. The obtained component A had a hydroxyl value of 252 mgKOH / g and a viscosity (25°C) of 1730 mPa·s.

[0039] Preparation of component B: add 100 parts of castor oil and 85 parts of HDI to the reactor, stir, vacuumize at a vacuum of about 1kPa for about 2 hours to dehydrate, then add 0.7 parts of stannous octoate and 0.8 parts of Sanya under the condition of nitrogen protection Ethylenediamine, heat up to 70 °C, react for 1 hour, then take samples every 30 minutes, measure the NCO content, stop the reaction when the NCO content is constant, cool to room temperature, dischar...

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Abstract

The invention relates to the technical field of chemical adhesives and aims at providing a preparation method of a dual-component solvent-free type polyurethane adhesive for composite flexible packaging. The preparation method comprises the following steps: (1) preparing an A component: sequentially adding polyether polyol with -OH end, castor oil, natural polysaccharides and a catalyst into a reaction kettle, stirring, heating to 60-80 DEG C, and performing vacuum dehydration; and cooling to room temperature, discharging, sealing and packaging; (2) preparing a B component: adding castor oil and polyisocyanate into the reaction kettle, stirring, and performing vacuum dehydration; adding stannous octoate and triethylene diamine under nitrogen production conditions, and heating to 60-80 DEG C; stopping the reaction when the content of NCO is constant, cooling to room temperature, discharging, sealing and packaging; and mixing the two components according to an OH / NCO functional group. According to the preparation method disclosed by the invention, an organic solvent is not used, the pollution is avoided, and the safety is high; raw materials are green, environment-friendly, degradable, easy to obtain and low in cost; the dual-component solvent-free type polyurethane adhesive further has the advantages of water (hydrolysis) resistance, flexibility and low temperature resistance; and a natural polysaccharide is used as a cross-linking agent, so that the cross-linking density and the bonding strength are improved.

Description

technical field [0001] The invention relates to a formula and a preparation method of a two-component, solvent-free polyurethane adhesive suitable for composite membranes, and belongs to the technical field of chemical adhesives. Background technique [0002] At present, the domestic food flexible packaging composite film industry mostly uses solvent-based adhesives. The use of a large amount of organic solvents can easily cause food safety problems and environmental pollution, and lead to increased packaging costs. As people pay more attention to food safety and environmental issues, more green solvent-free adhesives will be the development trend of the food flexible packaging industry in the future. [0003] Polyurethane adhesive has excellent low temperature resistance, fatigue resistance, flexibility, high bonding strength and transparency, and has excellent adhesion to various materials, so it has become the main adhesive used in the production of composite films. One ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/14C08G18/67C08G18/66C08G18/48C08G18/32B65D65/40B32B37/12
CPCY02W90/10
Inventor 陶利国潘鹏举
Owner ZHEJIANG HUABAO INK
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