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Polyether ester-based adhesive agent for solvent-free double-component polyurethane composite membrane and preparation method thereof

A two-component polyurethane, solvent-free technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as inability to use, poor wettability, and affect appearance

Active Publication Date: 2011-09-07
WANHUA CHEM BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing solvent-free adhesives have poor wettability and poor bonding performance, especially when used in PET aluminum-coated composite PET structures and aluminum foil composite PET structures, there are shrinkage cavities, which affect the appearance and cannot be used, and cannot meet various structures. Substrate compounding needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation method of A component

[0042] Add 20 parts of carbodiimide liquefied MDI and 40 parts of diphenylmethane-4,4-diisocyanate into the reaction kettle, mix and heat up to 55°C, then add 20 parts of polyoxypropylene diol with a number average molecular weight of 400, several 20 parts of polydiethylene glycol adipate diols with an average molecular weight of 2000. In addition, 0.005% phosphoric acid is added to the total mass percentage of the above mixture, and the mixture is incubated at 75°C to 85°C for 3 hours to prepare an NCO-terminated prepolymer, which is used as component A of the adhesive. It was confirmed to contain NCO group by infrared spectrum measurement.

[0043] Preparation method of B component

[0044] (1) In a nitrogen atmosphere, add diethylene glycol and adipic acid into the reaction kettle and raise the temperature to 200°C. The molar ratio of diethylene glycol and adipic acid is: diethylene glycol : adipic acid = 1:0.5. At 200°C, the r...

Embodiment 2

[0048] Preparation method of A component

[0049] Add 40 parts of carbodiimide liquefied MDI and 20 parts of diphenylmethane-4,4-diisocyanate into the reaction kettle, mix and heat up to 60°C, then add 20 parts of polyoxypropylene diol with a number average molecular weight of 1000 and several 10 parts of polyadipate-1,2-propylene glycol ester diol with an average molecular weight of 700. In addition, 0.01% benzoyl chloride is added to the above mixture, and the temperature is kept at 75°C to 85°C for 3 hours to prepare an NCO-terminated prepolymer, which is used as the A component of the two-component solvent-free adhesive. It was confirmed to contain NCO group by infrared spectrum measurement.

[0050] Preparation method of B component

[0051] (1) In a nitrogen atmosphere, dipropylene glycol and sebacic acid are added to the reactor and the temperature is raised to 190°C. The mol ratio of dipropylene glycol and sebacic acid is: dipropylene glycol: sebacic acid= 1:0.35. ...

Embodiment 3

[0055] Preparation method of A component

[0056]With 20 parts of hexamethylene diisocyanate trimer, the mixture of diphenylmethane-4,4-diisocyanate and diphenylmethane-2,4-diisocyanate (wherein diphenylmethane-4,4-diisocyanate accounts for about mass fraction 50% of 40 parts) were added to the reactor and mixed with each other and the temperature was raised to 50°C, and then 30 parts of polyoxypropylene diol with a number average molecular weight of 2000 and polyadipate-1,3-propylene glycol ester diol with a number average molecular weight of 1000 were added. Alcohol 10 parts. In addition, 0.015% pyrophosphoric acid is added and accounts for the mass percentage of the above mixture, and the temperature is kept at 75° C. to 85° C. for 4 hours to prepare the NCO-terminated prepolymer, which is the A component of the two-component solvent-free glue. It was confirmed to contain NCO group by infrared spectrum measurement.

[0057] Preparation method of B component

[0058] (1) ...

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Abstract

The invention relates to a polyether ester-based adhesive agent for a solvent-free double-component polyurethane composite membrane and a preparation method thereof. The preparation method of the adhesive agent comprises the following steps of: firstly, mixing 100 parts of polyisocyanates and 30 to 150 parts of polyol, and then raising temperature for reacting; secondly, adding a stabilizing agent to prepare a component A of the adhesive agent; and then, synthesizing a polyether ester polyol, and matching with 0.5 to 2 parts of polyether polyol, 0.1 to 1.0 part of vegetable oil polyol and 0.01 to 0.2 part of micromolecular polyol to prepare a component B of the adhesive agent. When the components A and B are in use, the functional group mole ratio of NCO to OH is (1.0 -2.0):1. The invention has the following advantages: the preparation method is safe and environmentally-friendly without solvent discharge; and the adhesive agent has low sizing quantity, high base material wetting property, wide serviceable range, high bonding strength and long usable life, and can be boiled at a high temperature (100 DEG C) for 40 minutes.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane adhesive suitable for composite flexible packaging (food, beverage, medicine and cosmetics, etc.), in particular to an adhesive for a solvent-free two-component polyurethane composite film based on polyether ester. The preparation method of the mixture. Background technique [0002] Due to its superior performance and low price, composite flexible packaging is used in various fields of national economy, such as food, beverage, medicine, cosmetics, electronic products and other fields. Composite flexible packaging is based on the performance needs of flexible packaging by bonding two or more layers of film together. At present, most domestic flexible packaging manufacturers use solvent-based adhesives for dry lamination to produce composite films. Generally, the working concentration of solvent-based adhesives is about 30%, which will cause a large amount of organic solvents to volatilize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C09J175/08C08G18/48C08G18/78C08G65/28
Inventor 姚晓宁叶桂香张杰郭虹邢乾斌张平丁建生
Owner WANHUA CHEM BEIJING
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