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Polybutadiene rubber modified waterborne polyurethane adhesive and preparation method thereof

A technology of polybutadiene rubber and water-based polyurethane, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., and can solve problems such as poor initial adhesive peel strength, high heat activation temperature, and low solid content

Active Publication Date: 2014-09-10
CHANGCHUN SANHUA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a polybutadiene rubber modified water-based polyurethane adhesive to solve the problems of high thermal activation temperature, low solid content, poor initial tack and peel strength of the existing polybutadiene rubber modified water-based polyurethane adhesive. Polyurethane adhesive and preparation method thereof

Method used

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  • Polybutadiene rubber modified waterborne polyurethane adhesive and preparation method thereof
  • Polybutadiene rubber modified waterborne polyurethane adhesive and preparation method thereof
  • Polybutadiene rubber modified waterborne polyurethane adhesive and preparation method thereof

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preparation example Construction

[0030] The preparation method of polybutadiene rubber modified waterborne polyurethane of the present invention includes:

[0031] Step 1: Reacting hydroxyl-terminated polybutadiene, polyester diol and diisocyanate to obtain the first intermediate;

[0032] Step 2: Reacting the first intermediate obtained in Step 1 with a small molecule chain extender to obtain a second intermediate;

[0033] Step 3: Reacting the second intermediate obtained in Step 2 with sodium ethylenediaminoethanesulfonate to obtain a polybutadiene rubber modified waterborne polyurethane.

[0034] As described in step one of the present invention, at room temperature, first add hydroxyl-terminated polybutadiene and polyester diol into the reaction kettle, dehydrate for 2 hours at a temperature of 100-120°C and -0.01 MPa, and then Then the diisocyanate is added dropwise to the reaction kettle to react to obtain the first intermediate; the reaction temperature is preferably 65-70°C, the reaction time is preferably 1...

Embodiment 1

[0046] At room temperature, add 2300g of hydroxyl-terminated polybutadiene (molecular weight of 2300 daltons) and 200g of polybutylene adipate (molecular weight of 2000 daltons) into the reaction kettle, and heat to 100°C. Dehydrate for 2 hours at 0.01 MPa, and cool to 65° C., then, drop 785 g of 1,6-hexamethylene diisocyanate at a rate of 10 ml / min. After the addition is complete, continue to react for 1.5 hours to obtain the first intermediate;

[0047] To the system of the first intermediate, 2250g of acetone was added to reduce the viscosity of the reaction system, 0.001g of dibutyltin dilaurate catalyst and 85g of 1,4-butanediol were added, the temperature rose to 75℃, and the reaction was continued for 2 hours , Get the second intermediate;

[0048] The temperature of the reaction system was lowered to 35°C, 122g of 95% sodium ethylenediamine ethanesulfonate aqueous solution was added at one time for chain extension, reacted for 15 minutes, then 3500g of deionized water was a...

Embodiment 2

[0050] At room temperature, add 4500g of hydroxyl-terminated polybutadiene (molecular weight of 4500 Daltons) and 500g of polybutylene adipate (molecular weight of 5000 Daltons) into the reaction kettle, and heat to 120°C. Dehydrate for 2 hours at 0.01 MPa, and cool to 70° C., then, drop 1350 g of dicyclohexylmethane diisocyanate at a rate of 15 ml / min. After the addition is complete, continue the reaction for 3 hours to obtain the first intermediate;

[0051] To the system of the first intermediate, 2785g of acetone was added to reduce the viscosity of the reaction system, 0.003g of stannous octoate catalyst and 136g of diethylene glycol were added, the temperature was raised to 80°C, and the reaction was continued for 4 hours to obtain the second Intermediate

[0052] The temperature of the reaction system was lowered to 45°C, 292g of 95% sodium ethylenediamine ethanesulfonate aqueous solution was added at one time to extend the chain, reacted for 25 minutes, and then 6200g of de...

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Abstract

The invention discloses a polybutadiene rubber modified waterborne polyurethane adhesive and a preparation method thereof, which belong to the field of waterborne polyurethane adhesives and are used for solving the problems that an existing polybutadiene rubber modified waterborne polyurethane adhesive is high in thermal activation temperature, low in solid content and poor in primary viscosity and peeling strength. In order to solve the problems, the adhesive disclosed by the invention comprises the following components in parts by weight: 75-100 parts of polybutadiene rubber modified waterborne polyurethane, 3-5 parts of white carbon black, 0.2-0.5 part of 3-amino propyl triethoxysilane, 0.15-0.3 part of waterborne thickening agent, 8-15 parts of plasticizer and 3-7 parts of waterborne curing agent. The invention further provides a preparation method of the polybutadiene rubber modified waterborne polyurethane adhesive. After the adhesive disclosed by the invention is adhered with a sample and impacted for 5 cycles at a high-low temperature between -65 DEG C and 120 DEG C, the peeling strength is reduced by not more than 5%, the elongation at break is as high as 380%-510%, and the tensile strength is as high as 2.8 MPa-4.2MPa.

Description

Technical field [0001] The invention belongs to the field of waterborne polyurethane adhesives, and specifically relates to a polybutadiene rubber modified waterborne polyurethane adhesive and a preparation method thereof. technical background [0002] Waterborne polyurethane adhesives have been widely used in shoemaking, vacuum plastics, automotive interiors, textile lamination and other fields. High-performance waterborne polyurethane adhesives should have high solid content, low viscosity, stable storage, low thermal activation temperature, and high initial viscosity. And peel strength, better heat and hydrolysis resistance, low temperature resistance and other properties. Waterborne polyurethane is a block copolymer composed of a soft segment and a hard segment. The polymer diol constitutes the soft segment. The soft segment affects many properties of the polymer, such as the flexibility, water resistance, hardness, etc. of the coating film. Affect the storage stability and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/14C09J11/04C09J11/06C08G18/69C08G18/66C08G18/42C08G18/32
Inventor 张振久蒋舰周宇飞陈景玉刘闯张旭李春郁刘凯
Owner CHANGCHUN SANHUA IND
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