Thermal-resistant PVC (Polyvinyl Chloride) composite double-component polyurethane adhesive and preparation method thereof

A two-component polyurethane and adhesive technology, applied in the field of polyurethane materials, can solve the problems of peeling decline, poor heat resistance, degumming, etc.

Inactive Publication Date: 2017-05-31
JIAXING HEXIN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many PVC products, such as swimming rings, window advertisements, plastic swimming pools, etc., require adhesives, and polyurethane adhesives have been widely used due to their excellent performance. However, polyurethane adhesives on the market generally have poor heat resistance. There are various problems such as peeling off and degumming when making products that require heat resistance

Method used

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  • Thermal-resistant PVC (Polyvinyl Chloride) composite double-component polyurethane adhesive and preparation method thereof
  • Thermal-resistant PVC (Polyvinyl Chloride) composite double-component polyurethane adhesive and preparation method thereof

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preparation example Construction

[0011] The preparation method of this heat-resistant type PVC composite two-component polyurethane adhesive can be the following steps:

[0012] (1) Preparation of polyester polyol: under the action of composite catalyst B, dibasic acid and polyol are subjected to polyesterification reaction at 140°C-250°C under the protection of nitrogen, until the acid value is reduced to below 1mgKOH / g , stop the reaction when the hydroxyl value is 30-200mgKOH / g, and obtain polyester polyol;

[0013] (2) Preparation of the main adhesive agent: dissolve the hydroxychloride resin in part of the solvent, add the polyester polyol, chain extender, and isocyanate prepared in step (1) into the reaction kettle, and heat up to 50-80°C Fully react; then add part of the solvent to dilute, add the remaining isocyanate in batches until the viscosity meets the requirements; finally add small molecule polyol and the remaining solvent to terminate the reaction, cool to 35-40°C and discharge;

[0014] (3) ...

Embodiment 1

[0017] 1. Preparation of polyester polyol 1:

[0018] Mix 822gAA, 385gEG and 5g catalyst tetraisobutyl titanate, heat to 210°C under the protection of nitrogen for polyesterification reaction, react for 18Hr, stop the reaction when the acid value is 0.3mgKOH / g, and the hydroxyl value is 56mgKOH / g. 960g polyester polyol.

[0019] Two, prepare polyester polyol 2:

[0020] Mix 370gAA, 247gPTA, 160gEG, 370gDEG and 5g catalyst tetraisobutyl titanate, heat to 240°C under nitrogen protection for polyesterification reaction, react for 20Hr, when the acid value is 0.3mgKOH / g, and the hydroxyl value is 225mgKOH / g The reaction was stopped to obtain 960 g of polyester polyol.

[0021] 3. Prepare the main agent of polyurethane adhesive:

[0022] (1) Take 20g of hydroxychloride resin, mix it with 40g of MEK (butanone), stir and dissolve it, put it into the reaction kettle together with 150g of prepared polyester polyol 1 and 20g of polyester polyol 2, and slowly heat to 50 °C, stir to m...

Embodiment 2

[0029] 1. Preparation of polyester polyol 3:

[0030] Mix 697gAA, 476gBG and 5g catalyst tetraisobutyl titanate, heat to 220°C under the protection of nitrogen for polyesterification reaction, react for 16Hr, stop the reaction when the acid value is 0.3mgKOH / g, and the hydroxyl value is 56mgKOH / g. Polyester polyol 961g.

[0031] Two, prepare the main agent of polyurethane adhesive:

[0032] (1) get 20g hydroxychloride resin, mix homogeneously with 40g MEK (butanone), after stirring and dissolving, drop into the reactor together with the polyester polyol 3 prepared by 145g, the polyester polyol 2 prepared by 25g embodiment 1, Slowly heat to 50°C and stir to make it evenly mixed.

[0033] (2) Put in 22g of MDI, heat up to 75°C, and react for 1 hour.

[0034] (3) Add 0.03g of dibutyltin dilaurate as a catalyst, add 12.5gMDI, 160gETAC (ethyl acetate), and 325gMEK (butanone) in batches according to its viscosity, and adjust the viscosity to 2530mPa.s / 25°C

[0035] (4) Add 0.5g ...

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Abstract

The invention discloses a thermal-resistant PVC (Polyvinyl Chloride) composite double-component polyurethane adhesive which comprises a polyurethane prepolymer as a main agent and comprises raw materials, namely, oligomer polyhydric alcohols, hydroxyl chloride vinyl acetate resin, a chain extender, polyisocyanates, a catalyst A and a solvent in a mass ratio of 100:(5-20):(0-20):(10-30):(0-0.05):(300-800), wherein the viscosity of the adhesive is 1000-20000cps/25 DEG C, the solid content of the adhesive is 20-50%, a curing agent is a polyurethane prepolymer of a mono-isocyanate group which is synthesized from polyisocyanates and a polyhydroxy compound by using a prepolymerization method, the content of the polyisocyanates is 10-15wt%, and the solid content is 70-80%. Due to addition of the hydroxyl chloride vinyl acetate resin which has very good affinity with a PVC substrate, a prepared primary product is very high in adhesion strength, good in plasticizer resistance effect, very good in peeling strength, very high in tearing load and very good in thermal resistance.

Description

technical field [0001] The invention relates to the field of polyurethane materials, in particular to a heat-resistant two-component polyurethane adhesive for PVC compounding and a preparation method thereof. Background technique [0002] Polyurethane adhesives refer to adhesives containing carbamate groups (-NHCOO-) or isocyanate groups (-NCO-) in the molecular chain. Polyurethane adhesives are highly active and polar, and they are compatible with substrates containing active hydrogen, such as Porous materials such as foam, plastic, wood, leather, fabric, paper, ceramics, and materials with smooth surfaces such as metal, glass, rubber, and plastic have excellent chemical adhesion. Many PVC products, such as swimming rings, window advertisements, plastic swimming pools, etc., require adhesives, and polyurethane adhesives have been widely used due to their excellent performance. However, polyurethane adhesives on the market generally have poor heat resistance. There are vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C08G18/42C08G18/62C08G18/65C08G18/66C08G18/12C08G18/32C08G63/16C08G63/183
CPCC09J175/06C08G18/12C08G18/4063C08G18/4202C08G18/4213C08G18/4238C08G18/6275C08G18/6511C08G18/664C08G63/16C08G63/183C08G18/3206
Inventor 沈建峰纪尚超石磊李寿伟沈连根徐欣欣武锦峰
Owner JIAXING HEXIN CHEM IND
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