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PP-free reactive polyurethane hot melt adhesive for automotive lights

A technology of polyurethane hot melt adhesive and automobile lights, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of product qualification rate decline, achieve reduced production processes, good weather resistance and Temperature resistance, the effect of avoiding the decline of product qualification rate

Active Publication Date: 2021-06-08
JIANGSU HUADA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of a primer or plasma treatment of PP is likely to cause a decline in the product qualification rate caused by poor treatment.

Method used

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  • PP-free reactive polyurethane hot melt adhesive for automotive lights

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a modified polyester polyol, prepared by the following method:

[0028] Add 650g of 1.6 hexanediol, 1100g of adipic acid and 0.2g of titanium catalyst in turn in the reaction kettle, turn on the stirring, and start to heat up to 140°C when the temperature is constant for 3h to stabilize the dehydration rate (through the rectification tower, the temperature at the top of the tower is kept 110°C), continue to heat up to 190°C, turn on the vacuum pump, and control the vacuum to gradually increase to -0.1MPa. Raise the temperature to 220°C for the transesterification reaction, and pass through nitrogen to take away the excess polyols and small molecule alcohols. After 5 hours from the start of vacuuming, take a sample every 2 hours for central control analysis until the final acid value is (0.1-0.3) mgKOH / About g, the hydroxyl value is 33.0mgKOH / g, return to normal pressure, drop to 100°C, discharge and store, and obtain polyester polyol A.

Embodiment 2

[0030] This embodiment provides a modified polyester polyol, prepared by the following method:

[0031] Add 650g of 1.6 hexanediol, 1200g of sebacic acid and 0.22g of titanium catalyst in turn in the reaction kettle, turn on the stirring, start to heat up to 150°C when the temperature is constant for 5h, and stabilize the dehydration rate (through the rectification tower, the temperature at the top of the tower is maintained 120°C), continue to heat up to 190°C, turn on the vacuum pump, and control the vacuum to gradually increase to -0.1MPa. Raise the temperature to 225°C for the transesterification reaction, and pass through nitrogen to take away the excess polyols and small molecule alcohols. After 7 hours from the start of vacuuming, take a sample every 2 hours for central control analysis until the final acid value is (0.1-0.3) mgKOH / About g, the hydroxyl value is 33.0mgKOH / g, return to normal pressure, drop to 100°C, discharge and store, and obtain polyester polyol B. ...

Embodiment 3

[0033] This embodiment provides a modified polyester polyol, prepared by the following method:

[0034] Add 665g of 1.6 hexanediol, 1200g of dodecanedioic acid and 0.25g of titanium catalyst successively in the reactor, turn on the stirring, start to heat up to 150°C and keep the temperature constant for 6h to stabilize the dehydration rate (through the rectification tower, the tower top Keep the temperature at 120°C), continue to heat up to 190°C, turn on the vacuum pump, and control the vacuum degree to gradually increase to -0.1MPa. Raise the temperature to 225°C for the transesterification reaction, and pass through nitrogen to take away the excess polyols and small molecule alcohols. After 10 hours from the start of vacuuming, take a sample every 2 hours for central control analysis until the final acid value is (0.1-0.3) mgKOH / g, the hydroxyl value is 33.0mgKOH / g, return to normal pressure, drop to 100°C, discharge and store, and obtain polyester polyol C.

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Abstract

The invention relates to a reactive polyurethane hot-melt adhesive for automobile lights without PP treatment. The raw materials include isocyanate and modified polyester polyol with a hydroxyl value of 28-112 mgKOH / g. The modified polyester polyol is composed of polybasic acid It is prepared by polymerization reaction with polyol in the presence of a catalyst; the present invention uses specific polybasic acid and polyol to polymerize to obtain modified polyester polyol, and then reacts modified polyester polyol with isocyanate to obtain reactive polyurethane thermal Melt glue, and the hot melt glue is used to bond the plastic parts of car lamps PC and PP. PP can be bonded without treatment, which reduces the production process and can avoid the use of primer or plasma treatment of PP caused by poor treatment. The qualified rate of products has declined. At the same time, it also has good weather resistance and temperature resistance.

Description

technical field [0001] The invention belongs to the field of adhesives, and in particular relates to a reactive polyurethane hot-melt adhesive for automobile lights without PP treatment. Background technique [0002] The currently used reactive polyurethane hot melt adhesives are used to bond PC and PP for car lamp plastic parts. Usually, PP needs to use primer or plasma treatment for PP. However, the use of a primer or plasma treatment of PP is likely to cause a drop in product qualification rate caused by poor treatment. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a reactive polyurethane hot-melt adhesive for automobile lamps free of PP treatment. [0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: [0005] A reactive polyurethane hot-melt adhesive free of PP treatment for automobile lamps, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C08G18/42C08G18/68
CPCC08G18/4238C08G18/68C09J175/06
Inventor 丛小雨
Owner JIANGSU HUADA NEW MATERIAL CO LTD
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