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Preparation method of low-temperature-resistant TPU hot melt adhesive membrane

A technology of hot-melt adhesive film and low temperature resistance, which is applied in the direction of heat-activated film/sheet, film/sheet-shaped adhesive, adhesive, etc., and can solve problems such as poor bonding strength, high melting point, stretching or fracture, Achieve strong surface adsorption and large specific surface area

Inactive Publication Date: 2018-03-06
徐冬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are two methods for the production of commonly used TPU hot-melt adhesive films: the first method is to sandwich the TPU melt with two layers of release paper after the extrusion mold comes out, and extrude it into a TPU hot-melt film through a forming roller. The adhesive film and release paper play a protective role; another method is to use a layer of release paper, and the forming roller on the side of the TPU melt is coated with Teflon, but during production, the Teflon on the forming roller Occasionally, it will stick to the TPU melt, causing defects such as air bubbles between the release paper and the TPU hot melt adhesive film, resulting in an increase in the defective rate
In addition, in the process of use, it was found that the bonding strength of TPU film attached to fabrics, shoe materials and bags is poor, and the melting point is high, so it is easy to be stretched or broken by external force.

Method used

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  • Preparation method of low-temperature-resistant TPU hot melt adhesive membrane

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Put 60g of rosin into a four-necked flask equipped with a condenser, a stirrer, and a dropping funnel, pass nitrogen to the four-necked flask to drive away the air, heat up to 150°C, start the agitator, and stir at a speed of 400r / min. After all melted, add 35g of rosin, add dropwise 30mL of maleic anhydride to the four-neck flask with a dropping funnel at a dropping rate of 3mL / min while stirring. Diolefination product: add 40mL glycerin to the above-mentioned dienylation product, heat the above-mentioned four-neck flask to 270°C, keep the temperature for 7 hours, cool down to room temperature naturally, and discharge the material to obtain the esterification product, and vacuumize the esterification product , control the vacuum degree to be 0.02MPa, take out the small molecule product, obtain the esterified product of purification, namely modified rosin; Alcohol, 10 parts of stannous octoate, and 20 parts of modified rosin are placed in a three-necked flask with a ven...

example 2

[0026] Add 63g of rosin into a four-necked flask equipped with a condenser, a stirrer, and a dropping funnel, pass nitrogen to the four-necked flask to drive away the air, heat up to 155°C, start the agitator, and stir at a speed of 500r / min. After all melted, add 38g of rosin, and add 33mL of maleic anhydride dropwise to the four-neck flask with a dropping funnel at a dropping rate of 3mL / min while stirring. Obtain the dienylation product; add 43mL glycerin to the above-mentioned dienylation product, heat the above-mentioned four-necked flask to 275°C, keep it warm for 7.5h, cool down to room temperature naturally, and discharge the material to obtain the esterification product, and the esterification product Vacuumize, control the vacuum degree to be 0.03MPa, take out the small molecular product, obtain the esterification product of purification and be modified rosin; By weight, 38 parts of polybutylene adipate diol, 23 parts of polyoxygen Propylene glycol, 11 parts of stannou...

example 3

[0028] Add 65g of rosin into a four-necked flask equipped with a condenser, a stirrer, and a dropping funnel, pass nitrogen to the four-necked flask to drive away the air, heat up to 160°C, start the agitator, stir at a speed of 550r / min, and wait for the rosin to After all melted, add 40g of rosin, add 35mL of maleic anhydride dropwise to the four-neck flask with a dropping funnel at a dropping rate of 4mL / min while stirring. Diolefination product: add 45mL glycerin to the above-mentioned diolefination product, heat the above-mentioned four-neck flask to 280°C, keep it warm for 8 hours, cool down to room temperature naturally, and discharge the material to obtain the esterification product, and vacuumize the esterification product , control the vacuum degree to be 0.04MPa, take out the small molecule product, obtain the esterified product of purification, namely modified rosin; Alcohol, 12 parts of stannous octoate, and 22 parts of modified rosin are placed in a three-necked ...

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Abstract

The invention relates to the technical field of high molecular adhesives and particularly relates to a preparation method of a low-temperature-resistant TPU hot melt adhesive membrane. The preparationmethod comprises the following steps: modifying rosin to obtain modified rosin; reacting with other raw materials to prepare polyurethane; and adding an additive to react to obtain the low-temperature-resistant TPU hot melt adhesive membrane. According to the preparation method provided by the invention, the surface adsorption capacity of fumed silica is strong, and polyurethane at the low temperature is accumulated on the surface of the fumed silica and is hardly oriented to be orderly arranged and crystallized, so that the low-temperature crystallization of the low-temperature-resistant TPUhot melt adhesive membrane is reduced; low-temperature-resistant TPU hot melt adhesive membrane and rosin react to obtain maleated rosin which has the characteristics of being relatively high in softening point, acid value and the like; the maleated rosin reacts with glycerinum to generate modified rosin resin, so that the softening point thereof is increased, and the stability thereof is improved; at the low temperature, the TPU hot melt adhesive membrane keeps viscoelasticity, so that a purpose of keeping high adhesive property at the low temperature is reduced, and the low-temperature-resistant TPU hot melt adhesive membrane is wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of polymer adhesive preparation, in particular to a preparation method of a low-temperature-resistant TPU hot-melt adhesive film. Background technique [0002] The hot-melt adhesive film is made of hot-melt adhesive into a film of a certain thickness, placed between the adherends, and bonded by heating and pressing. It helps industrial production to achieve modularization, and can be conveniently operated continuously or intermittently, improving production efficiency and saving rubber materials at the same time. Hot melt adhesive film is mainly divided into: EVA film, PA film, PES film, PO film and TPU film. [0003] TPU is thermoplastic polyurethane, an environmentally friendly polymer with excellent high tension, high tensile strength, toughness and aging resistance. It is a mature environmental protection material. At present, TPU has been widely used in medical and health care, electronic appliances, ...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J193/04C09J123/06C09J11/04C09J7/10C09J7/35C08G18/40C08G18/42C08G18/48
CPCC08G18/4018C08G18/4238C08G18/4825C08L2203/16C08L2205/03C08L2207/04C09J7/00C09J11/04C09J175/06C09J2301/304C09J2301/408C08L23/06C08L93/04C08K3/34C08K3/36
Inventor 龙启建何俊欣张淑娴
Owner 徐冬
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