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Flexible packaging composite resin and preparation method thereof

A composite resin and flexible packaging technology, applied in the direction of adhesive type, polyurea/polyurethane adhesive, adhesive, etc., can solve problems such as tunneling, wrinkling, and weak bonding strength

Active Publication Date: 2014-03-05
JIANGSU LIHE ADHESIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, my country's color printing enterprises use coating at room temperature. Since solvent-free adhesives do not use solvents, in order to meet the process requirements for coating at room temperature, the viscosity of solvent-free adhesives must be low, generally at 2000mPa. s, and the viscosity of the solvent-free adhesive is related to the molecular weight. The lower the viscosity of the adhesive, the smaller the molecular weight of the adhesive, the worse the initial adhesion, the weaker the bonding strength, and the low-viscosity adhesive is prone to tunneling after coating , wrinkling and other quality problems

Method used

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  • Flexible packaging composite resin and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] The preparation method of a kind of flexible packaging composite resin of the present invention is as follows:

[0025] The first step, the preparation of component A:

[0026] Put 1 mol of polyoxypropylene diol in a four-necked flask, dehydrate under the vacuum condition of -0.1Mpa, when the water mass percentage is less than 0.05%, drop to 35°C, add 3.5 mol of HDI and 1 mol of MDI under the protection of nitrogen- 50, raise the temperature to 75±5°C for 3 hours, then raise the temperature to 90°C for 1 hour until the reaction is complete;

[0027] The second step, the preparation of component B:

[0028] Mix 2mol polyester with 1.2mol polytetrahydrofuran evenly.

[0029] Among them, the preparation method of polyester polyol is: in a four-necked flask equipped with a thermometer, a stirrer, a spherical cooler, and a nitrogen-sealed tube, add 600 g of adipic acid, 400 g of isophthalic acid, diethylene di 530g of alcohol, 350g of 1,6 hexanediol and 0.22g of tetrabuty...

Embodiment 2

[0034] The first step, the preparation of component A:

[0035] Put 1 mol of polytetrahydrofuran diol and 0.5 mol of polyoxypropylene triol in a four-neck flask, dehydrate under -0.1Mpa vacuum condition, when the water mass percentage is less than 0.05%, drop to 35°C, add under nitrogen protection 5.3mol of isophorone diisocyanate (IPDI) and 1.7mol of MDI-50, heated to 75±5°C for 3 hours, then raised to 90°C for 1 hour, until the reaction is complete;

[0036] The second step, the preparation of component B:

[0037] Mix 1mol polyester with 1mol castor oil evenly.

[0038] Among them, the preparation method of polyester polyol is: in a four-necked flask equipped with a thermometer, a stirrer, a spherical cooler, and a nitrogen-sealed tube, add 500 g of sebacic acid, 300 g of adipic acid, 1,4-butanedi 230g of alcohol, 380g of 1,6 hexanediol and 0.22g of tetrabutyl titanate catalyst, stir evenly, then slowly raise the temperature to 160°C, control the top temperature to not ex...

Embodiment 3

[0043] The first step, the preparation of component A:

[0044]Put 1.3mol polyoxypropylene diol and 0.5mol tetrahydrofuran-oxypropylene copolyether alcohol in a four-necked flask, dehydrate under -0.1Mpa vacuum condition, when the moisture mass percentage is less than 0.05%, drop to 35°C, in Add 6mol HDI and 2.6mol toluene diisocyanate (TDI) under the protection of nitrogen, raise the temperature to 75±5°C for 3 hours, then raise the temperature to 90°C for 1 hour until the reaction is complete;

[0045] The second step, the preparation of component B:

[0046] Mix 1mol polyester with 1.2mol polyoxypropylene glycol;

[0047] Among them, the preparation method of polyester polyol is: in a four-necked flask with a thermometer, a stirrer, a spherical cooler, and a nitrogen sealed tube, add 410 g of sebacic acid, 500 g of phthalic anhydride, and 1,2 propylene glycol 200g, 520g of 1,6-hexanediol and 0.22g of tetrabutyl titanate catalyst, stir evenly, then slowly raise the tempera...

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Abstract

The invention discloses flexible packaging composite resin and a preparation method thereof. The flexible packaging composite resin consists of a component A and a component B, wherein the component A is a polyurethane prepolymer containing isocyanate groups (-NCO); the component B is a mixture of polyester and polyether polyol containing hydroxyl groups (-OH), and the application proportion requirement of the component A and the component B is as follows: the mol ratio of the functional group -NCO to the functional group -OH is (1.4-2.2): 1.0. At the application state, the viscosity of a binder obtained by mixing the component A and the component B according to the stipulated ratio is relatively low, and the binder has an excellent coating performance under the normal-temperature condition, also has extremely high in adhesion strength after being bonded, can meet the technological requirement an existing normal-temperature coating process in China and is relatively high the inertial adhesion, and the quality flaws such as tunnel and crinkling after the binder is coated can be avoided.

Description

technical field [0001] The invention relates to a flexible packaging composite resin and a preparation method thereof. Background technique [0002] In the domestic food flexible packaging composite film industry, most of the adhesives used are solvent-based polyurethane adhesives, and are applied at room temperature. Since solvent-based polyurethane adhesives contain a large amount of solvent, there must be environmental pollution and safety hazards during use. With the improvement of the country's environmental protection requirements and the implementation of food safety regulations, various places have successively issued the "Volatile Organic Compound Emission Standards for the Printing Industry", which has raised higher limit requirements for solvent emissions, and the usage of solvent-based adhesives will be reduced. decrease year by year. [0003] The use of flexible packaging polyurethane composite resin can meet the current environmental protection and energy sav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/48C08G18/10
Inventor 蔡炳照
Owner JIANGSU LIHE ADHESIVE
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