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Adhesive for soft package compound and preparation method thereof

A flexible packaging and adhesive technology, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of unusable, slow drying, product contamination, etc., and achieve the effect of reducing pollution and reducing viscosity

Active Publication Date: 2009-09-30
中山市康和化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent-free polyurethane adhesives are divided into two-component and one-component. Although the one-component solvent-free polyurethane adhesive is convenient to use, it will cause problems such as easy foaming of the composite film and poor curing during curing. Therefore, in recent years, solvent-free two-component The application of one-component polyurethane adhesives is expanding in the food industry
[0004] Chinese patent ZL 200610036231.3 also pointed out that there are problems such as product pollution, environmental pollution, and production safety hazards in the adhesives used for flexible packaging lamination in my country, and disclosed a dry laminating water-based adhesive for flexible packaging and its preparation method
Although water-based adhesives have the advantages of no pollution to the environment, non-flammable, non-toxic, and wide adaptability, the composite strength of water-based adhesives is still lower than that of ester-soluble polyurethane adhesives, and the technical development of cooking is still a problem.
At the same time, the drying speed is slow, the energy consumption and cost are high, and it cannot be further developed under the current situation of increasingly tight energy sources.
[0005] Chinese patent application 200710034865.X discloses a two-component, solvent-free polyurethane adhesive modified by nano silicon micropowder and its preparation method, which is characterized in that it consists of component A and component B, and component A is composed of toluene diisocyanate, Composed of polyether polyol and trimethylolpropane, component B is composed of liquid amino resin, dibutyl phthalate, flame retardant, and nano-silica powder. The prepared adhesive has the characteristics of high strength and heat and humidity resistance. It is mainly used for bonding soft materials or hard materials such as metal, plastic, glass, etc., as well as occasions that require high strength and resistance to humidity and heat, but this product cannot be used as an adhesive for food flexible packaging

Method used

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  • Adhesive for soft package compound and preparation method thereof
  • Adhesive for soft package compound and preparation method thereof
  • Adhesive for soft package compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] (1) Hydroxyl polyester polymer component (A):

[0095] The preparation of hydroxyl polyester polymer (I):

[0096] First, add 970g of adipic acid, 600g of diethylene glycol, 300g of 1,2- Propylene glycol and 0.2 g of catalyst tetrabutyl titanate. Then, the temperature was raised to 160°C for 2 hours, and then the temperature was gradually raised to 230°C at a rate of 10-15°C per hour. Finally, the reaction was incubated at 230° C. for 2.5 h. When the measured acid value is less than 20, start vacuuming for 1 hour under the condition of negative pressure less than 0.08MPa and temperature of 230°C. Finally, under the condition of a negative pressure of 0.1MPa, vacuumize for 1 hour to obtain the hydroxyl polyester polymer (I).

[0097] Preparation of hydroxyl polyester polymer (II):

[0098] First, add 1000g of adipic acid, 800g of ethylene glycol, 400g of glycerol, 500g of ortho Phthalic anhydride and 0.27 g of catalyst tetrabutyl titanate. Then, the temperature was ...

Embodiment 2

[0111] (1) Hydroxyl polyester polymer component (A):

[0112] The preparation of hydroxyl polyester polymer (I):

[0113] First, add 487g of adipic acid, 290g of diethylene glycol, 147g of 1,2- Propylene glycol and 0.09 g of catalyst tetrabutyl titanate. Then, the temperature was raised to 160°C for 2 hours, and then the temperature was gradually raised to 230°C at a rate of 10-15°C per hour. Finally, the reaction was incubated at 230° C. for 2.5 h. When the measured acid value is less than 20, start vacuuming for 1 hour under the condition of negative pressure less than 0.08MPa and temperature of 230°C. Finally, under the condition of a negative pressure of 0.1MPa, vacuumize for 1 hour to obtain the hydroxyl polyester polymer (I).

[0114] Preparation of hydroxyl polyester polymer (II):

[0115] First, in a reactor with stirrer, thermometer, straight cooler, horizontal cooler and nitrogen sealed tube, add 1080g of adipic acid, 790g of ethylene glycol, 580g of trimethylol...

Embodiment 3

[0128] (1) Hydroxyl polyester polymer component (A):

[0129] The preparation of hydroxyl polyester polymer (I):

[0130] First, add 241g of adipic acid, 150g of diethylene glycol, 75g of 1,2- Propylene glycol and 0.05 g of catalyst tetrabutyl titanate. Then, the temperature was raised to 160°C for 2 hours, and then the temperature was gradually raised to 230°C at a rate of 10-15°C per hour. Finally, the reaction was incubated at 230° C. for 2.5 h. When the measured acid value is <20, start vacuuming for 1 hour under the condition of negative pressure <0.08MPa and temperature of 230°C. Finally, under the condition of a negative pressure of 0.1MPa, vacuumize for 1 hour to obtain the hydroxyl polyester polymer (I).

[0131] Preparation of hydroxyl polyester polymer (II):

[0132] First, add 250g of adipic acid, 200g of ethylene glycol, 100g of glycerol, 125g of ortho Phthalic anhydride and 0.06 g of catalyst tetrabutyl titanate. Then, the temperature was raised to 150°C f...

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Abstract

The present invention discloses a macromolecule adhesive, particularly relates to an adhesive for a flexible package compound film and a preparation method thereof. The adhesive for a compound film includes a hydroxy polyester polymer component (A) and an isocyanate end capping prepolymer component (B), the preparation method is that firstly a polyester is synthesized by using a diatomic alcohol and a dibasic acid, a polyester is then synthesized by using a polyatomic alcohol and a dibasic acid, the polyester molecular mass is adjusted by selection and dosage proportion of the diatomic alcohol, the polyatomic alcohol and the dibasic acid chemical structure, so as to prepare the component (A); the diatomic alcohol reacts with a different isocyanate, and compose a isocyanate end capping prepolymer together with a biuret polymer of the isocyanate so as to prepare the component (B); the component (A) and the component (B) are mixed with each other at a certain proportionality to prepare a polyurethane adhesive for a double-component solvent-free type compound film. When using the adhesive, the coating amount of the adhesive is small, and a compound speed may arrive 300 m / min.

Description

technical field [0001] The invention relates to a polymer adhesive, in particular to a polymer adhesive used for flexible packaging composite films and a preparation method thereof. Background technique [0002] At present, most of the adhesives used in the food flexible packaging composite film industry in my country are solvent-based, but using solvent-based adhesives, there are volatile organic solvents that pollute the environment and safety issues, coupled with the increase in solvent prices (mainly petroleum as raw materials) and energy saving The development of solvent-based adhesives is limited. The quality of flexible packaging is closely related to the adhesive used, and due to its excellent performance, it can be used to prepare flexible packaging materials with various properties such as cold resistance, oil resistance, drug resistance, transparency, and wear resistance. In terms of adhesives for flexible packaging, polyurethane adhesives are gradually replacing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06
Inventor 陈志国杨川
Owner 中山市康和化工有限公司
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