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Bi-component polyurethane adhesive

A two-component polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems affecting the later operation, short pot life, slow curing speed, etc., to improve the curing speed , extend the validity period, and accelerate the effect of unblocking

Active Publication Date: 2012-07-04
GUANGZHOU RETAN NEW MATERIALS & HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One-component polyurethane adhesives are generally easy to operate, but in the production process, organic solvents are generally added, which does not meet environmental protection requirements; at the same time, one-component polyurethane adhesives are generally blocked by NCO groups, and are easy to mix with moisture in the air during storage. reaction, resulting in crusting, agglomeration, etc., and the storage period is short; in addition, one-component polyurethane adhesives generally do not add catalysts or only add a very small amount of catalysts, so the curing speed is slow, especially in low temperature environments, even 24 hours above to solidify
[0003] The traditional solvent-free two-component polyurethane adhesive does not add organic solvents during production, which meets environmental protection requirements; since the two components are stored separately, the storage period is longer, but after the two components are mixed according to the chemical ratio, the general pot life Too short, especially in the high temperature season, after the glue is mixed, the viscosity increases rapidly, which makes it difficult to use later, and a large amount of glue is scrapped or cannot form a good bond, resulting in a large number of substandard products
Even in the low temperature season, although the pot life is extended, the curing time is also prolonged, which affects the production efficiency of customers. Although the addition of conventional catalysts (organic bismuth, organic tin, amines, etc.) can speed up the curing speed, it also makes the pot life shorter. Very short, affecting later operations

Method used

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  • Bi-component polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The two-component polyurethane adhesive described in this embodiment consists of component A and component B:

[0036] The raw material composition and weight percentage of component A are: 60% polyether polyol I-stick polyol138, 35% quartz powder, 2% nano-calcium carbonate, 0.03% catalyst dibutyltin dilaurate, 2% Silquest A-187 by wt, DF 691 at 0.97% wt.

[0037] Component B is Suprasec 5005 with NCO content of 31%;

[0038] The weight ratio of component A to component B is 5:1.

[0039] The preparation method of above-mentioned two-component polyurethane adhesive comprises the steps:

[0040] (1) To prepare component A, accurately weigh each raw material according to the weight percentage, pour polyether polyol I-stick polyol 138 into the stirring tank, then add quartz powder filler and stir well, then heat the stirring tank and Vacuum until the vacuum degree is -0.1Mpa. When the temperature reaches 100°C, continue to maintain the vacuum for 1h, then add nano-calci...

Embodiment 2

[0043] The two-component polyurethane adhesive described in this embodiment consists of component A and component B:

[0044] The raw material composition and weight percentage of component A are: 2%wt neopentyl alcohol, 10%wt polyester polyol Bayercoll DS 1165, 25% polyether polyol I-stick polyol 138, 56% kaolin , 4% nano-titanium dioxide, 0.05% catalyst tetraethylenetriamine, 1%wt Silquest A-187, 1%wt Silquest A-Link 597, 0.95%wt DF 691.

[0045] Component B is Desmodur E21 with NCO content of 16%;

[0046] The weight ratio of component A to component B is 2:1.

[0047] The preparation method of above-mentioned two-component polyurethane adhesive comprises the steps:

[0048] (1) To prepare component A, accurately weigh each raw material according to the weight percentage, pour polyester polyol Bayercoll DS 1165 and polyether polyol I-stick polyol 138 into the stirring tank, then add kaolin filler and stir well , then heat the stirred tank and evacuate it to a vacuum degr...

Embodiment 3

[0050] Embodiment 3 application experiment

[0051] 1. Test method for pot life: refer to GB / T 2794-1995

[0052] The components A and B prepared in Examples 1 and 2 were mixed uniformly by a disperser (stirred at 1500rpm for 3 minutes) at the on-site temperatures shown in Tables 1 and 2, respectively. Then start the stopwatch and test the viscosity value of the glue after mixing every one minute. When the viscosity of the glue reaches or just exceeds 100,000mpa.s, it is defined as the end point, and the time at this time is the pot life.

[0053] 2. Shear strength performance test (see figure 1 ): Refer to GB 7124-1986.

[0054] Instruments: automatic air press, stretching machine, measuring tools with an accuracy of 1mm.

[0055] Test piece: moisture content 10±2%, density 700±100Kg / m 3 beech wood (25 x 30 x 10).

[0056] Sample preparation: apply glue on the bonding surface, the bonding area is 25mm×25mm, the amount of glue applied is 100g / m2, and the two test pieces a...

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Abstract

The invention discloses a bi-component polyurethane adhesive, which consists of a component A and a component B. The component A comprises the following raw materials in percentage by weight: 0-10% of monohydric alcohol, 30-90% of polyhydric alcohol, 8-60% of pigments and fillers, 1-10% of nano-filler, 0.01-1% of catalyst and 0.1-5% of silane coupling agent, wherein the sum of the raw materials is equal to 100%; the component B is isocyanate; and the weight ratio of the component A to the component B is 1-5:1. According to the bi-component polyurethane adhesive, the shelf life of the prepared bi-component polyurethane adhesive is obviously prolonged, and the curing speed is doubled.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a two-component polyurethane adhesive. Background technique [0002] Polyurethane adhesives are generally divided into one-component polyurethane adhesives and two-component polyurethane adhesives. One-component polyurethane adhesives are generally easy to operate, but in the production process, organic solvents are generally added, which does not meet environmental protection requirements; at the same time, one-component polyurethane adhesives are generally blocked by NCO groups, and are easy to mix with moisture in the air during storage. reaction, resulting in crusting, agglomeration, etc., and the storage period is short; in addition, one-component polyurethane adhesives generally do not add catalysts or only add a very small amount of catalysts, so the curing speed is slow, especially in low temperature environments, even 24 hours The above can be solidified. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/08C09J175/06C09J11/04C09J11/06
Inventor 张辉
Owner GUANGZHOU RETAN NEW MATERIALS & HI TECH CO LTD
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