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Preparation method of polyester polyol for laminated film adhesive

A technology of polyester polyol and composite film, applied in the field of polyester polyol preparation, can solve the problem of less disclosure of polyester polyol and the like, and achieve the effect of excellent bonding strength

Inactive Publication Date: 2018-08-21
SHANGHAI LIANJING MATERIAL ASSETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There is little published literature on composite film polyurethane adhesives or polyester polyols for composite film adhesives

Method used

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  • Preparation method of polyester polyol for laminated film adhesive
  • Preparation method of polyester polyol for laminated film adhesive
  • Preparation method of polyester polyol for laminated film adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Add 27.42% of isophthalic acid (IPA) and 29.57% of liquid neopentyl glycol NPG (except water) to the reactor by weight percentage, and feed nitrogen at 5-20 L / min, start stirring and heating , a program to raise the temperature to 180-190°C, hold at this temperature for 1-3 hours; then set the temperature to rise slowly to 210-230°C within 2-4 hours, and hold at this temperature for 2-4 hours. In the above process, water mainly occurs from esterification reaction. Pay attention to control the heating rate and the temperature at the top of the distillation tower within 100-105°C to prevent excessive loss of small molecule alcohol. During the temperature-holding process at 210-230°C, as the esterification reaction progresses, the acid value of the system gradually decreases, and the acid value is measured by sampling. When the acid value reaches 10-30mgKOH / g, the temperature can be lowered to 150-160°C , and then enter the second feeding reaction stage. The se...

Embodiment 2

[0031] Embodiment 2: In percent by weight, phthalic anhydride (PA) 26.28%, liquid neopentyl glycol NPG (except water) 31.79% are added in the reactor, and logical nitrogen 5~20L / min, start to stir and Heating, the temperature is raised to 180-190°C in one stage, and the temperature is maintained at this temperature for 1-3 hours; after that, the temperature is slowly raised to 210-230°C within 2-4 hours, and the temperature is maintained at this temperature for 2-4 hours. In the above process, water mainly occurs from esterification reaction. Pay attention to control the heating rate and the temperature at the top of the distillation tower within 100-105°C to prevent excessive loss of small molecule alcohol. During the temperature-holding process at 210-230°C, as the esterification reaction progresses, the acid value of the system gradually decreases, and the acid value is measured by sampling. When the acid value reaches 10-30mgKOH / g, the temperature can be lowered to 150-160°...

Embodiment 3

[0032] Example 3: In terms of weight percentage, 27.42% of isophthalic acid (IPA) and 33.55% of 3-methyl-1,5-pentanediol (MPD) were added to the reactor, and nitrogen gas was passed at 5 to 20 L / min , start stirring and heating, and heat up to 180-190°C in a one-step program, and hold at this temperature for 1-3 hours; then set the temperature to slowly rise to 210-230°C within 2-4 hours, and hold at this temperature for 2-4 hours. In the above process, water mainly occurs from esterification reaction. Pay attention to control the heating rate and the temperature at the top of the distillation tower within 100-105°C to prevent excessive loss of small molecule alcohol. During the temperature-holding process at 210-230°C, as the esterification reaction progresses, the acid value of the system gradually decreases, and the acid value is measured by sampling. When the acid value reaches 10-30mgKOH / g, the temperature can be lowered to 150-160°C , and then enter the second feeding re...

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Abstract

The invention provides a preparation method of polyester polyol for a laminated film adhesive. The preparation method comprises steps as follows: primary feeding is performed, 25.0%-35.0% of aromaticbinary carboxylic acid and 25.0%-40.0% of small-molecular diol are fed into a reaction kettle, programed heating is executed to promote esterification reaction, and after an acid value is reduced to 10-30 mgKOH / g, cooling is performed for secondary feeding; 25.0%-40.0% of aromatic binary carboxylic acid and 5.0%-15.0% of small-molecular diol are subjected to secondary feeding, the temperature is increased again, the esterification reaction is performed, water is produced, a tetrabutyl titanate or stannous octoate catalyst is added, programed heating and programmed vacuum are controlled, and atarget polyester polyol product containing both benzene ring aromatics and aliphatic hydrocarbon is obtained; the target polyester polyol product is primary hydroxyl terminated difunctional polyol andhas higher reactivity with isocyanate groups. The polyurethane adhesive prepared from polyester polyol as a main soft segment through polymerization is suitable for adhesion of food packaging laminated films which meet the high-temperature requirement and have steaming resistance for sterilization.

Description

technical field [0001] The invention relates to the preparation technology of polyester polyol, especially the preparation method of polyester polyol used for composite film adhesive. Background technique [0002] Polyester polyol is an alkyd polyester polyol formed by polycondensation of dicarboxylic acid and small molecule polyol. Commonly used dicarboxylic acids include adipic acid, azelaic acid, sebacic acid, succinic acid, phthalic anhydride, isophthalic acid, terephthalic acid, etc. Commonly used small molecule polyols include ethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, methylpropanediol, trimethylolpropane, glycerin, etc. Since there are many kinds of dicarboxylic acids and small molecule polyols, the molecular structures of polyester polyols synthesized by combination are various, and the product specifications of polyester polyols are also various. Polyester polyols synthesized with small molecule polyols ...

Claims

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Application Information

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IPC IPC(8): C08G63/181C08G63/672C08G63/78C09J175/06
CPCC08G63/181C08G63/672C08G63/78C09J175/06
Inventor 范年春许海亮龙双林佘文武
Owner SHANGHAI LIANJING MATERIAL ASSETAB
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