Polybutadiene rubber modified waterborne polyurethane adhesive and preparation method thereof

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

Active Publication Date: 2013-11-27
CHANGCHUN SANHUA IND
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  • 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

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preparation example Construction

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

[0031] Step 1: reacting hydroxyl-terminated polybutadiene, polyester diol and diisocyanate to obtain a 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 ethylenediamine sulfonate to obtain polybutadiene rubber-modified waterborne polyurethane.

[0034] As described in the first step of the present invention, at room temperature, the hydroxyl-terminated polybutadiene and polyester diol are first added to the reaction kettle, and the temperature is 100-120 ° C, under the condition of -0.01 MPa, dehydration is carried out for 2 hours, and then Add diisocyanate dropwise to the reaction kettle to react to obtain the first intermediate; the reaction temperature is preferabl...

Embodiment 1

[0046] At room temperature, add 2300g hydroxyl-terminated polybutadiene (molecular weight: 2300 Daltons) and 200g polybutylene adipate (molecular weight: 2000 Daltons) into the reactor, heat to 100°C, Under 0.01MPa, dehydrate for 2 hours, lower the temperature to 65°C, then add 785g of 1,6-hexamethylene diisocyanate dropwise at a rate of 10ml / min, and continue the reaction for 1.5 hours to obtain the first intermediate;

[0047] Add 2250g of acetone to the first intermediate system to reduce the viscosity of the reaction system, add 0.001g of dibutyltin dilaurate catalyst and 85g of 1,4-butanediol, raise the temperature to 75°C, and continue the reaction for 2 hours , to obtain the second intermediate;

[0048] Lower the temperature of the reaction system to 35°C, add 122g of 95% sodium ethylenediaminoethanesulfonate aqueous solution to extend the chain at one time, react for 15min, then add 3500g of deionized water, and remove the acetone under reduced pressure to obtain poly...

Embodiment 2

[0050] At room temperature, add 4500g hydroxyl-terminated polybutadiene (molecular weight: 4500 Daltons) and 500g polybutylene adipate (molecular weight: 5000 Daltons) to the reactor, heat to 120°C, Under 0.01MPa, dehydrate for 2 hours, lower the temperature to 70°C, then add 1350g of dicyclohexylmethane diisocyanate dropwise at a rate of 15ml / min, after the dropwise addition, continue to react for 3 hours to obtain the first intermediate;

[0051] To the system of the first intermediate, add 2785g of acetone to reduce the viscosity of the reaction system, add 0.003g of stannous octoate catalyst and 136g of diethylene glycol, the temperature rises to 80°C, and continue the reaction for 4 hours to obtain the second Intermediate;

[0052] Lower the temperature of the reaction system to 45°C, add 292g of 95% sodium ethylenediaminoethanesulfonate aqueous solution to extend the chain at one time, react for 25min, then add 6200g of deionized water, and remove the acetone under reduc...

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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 water-based polyurethane adhesives, in particular to a polybutadiene rubber modified water-based polyurethane adhesive and a preparation method thereof. technical background [0002] Water-based polyurethane adhesives have been widely used in shoemaking, vacuum blister, automotive interior, textile lamination and other fields. High-performance water-based polyurethane adhesives should have high solid content, low viscosity, stable storage, low thermal activation temperature, and high initial viscosity. And peel strength, good heat resistance and hydrolysis resistance, low temperature resistance and other properties. Waterborne polyurethane is a block copolymer composed of soft segment and hard segment, in which the polymer diol constitutes the soft segment, and the soft segment affects many properties of the polymer, such as the flexibility, water resistance, hardness, etc. of the coating film, and also Affect the...

Claims

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Application Information

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Patent Type & Authority Applications(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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