Hardener for use in urea maldehyde and urea-melamine-formaldehyde based adhesives, adhesive compsn. comprising said hardener and its use
A curing agent and adhesive technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve problems such as unhealthy environments, and achieve easy application, good wetting performance, and improved flexibility Effect
Inactive Publication Date: 2003-09-24
F HEIMANN
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, as mentioned above, the use of powders has many disadvantages compared to using liquid systems, such as dusting problems, resulting in an unhealthy environment, necessitating additional processing steps
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0060] 5.4g AlCl 3 and 4.4g NH 4 h 2 PO 4 Dissolve in 25g of water. 63 g of polyvinyl acetate emulsion DPN15 from Wacker Chemie GmbH, Germany were added. The sample was then stirred with 1.5 g polypropylene glycol 400 and 0.5 g antifoam SRE (1:4).
Embodiment 2
[0062] 5g AlCl 3 , 1g citric acid and 4.5g NH 4 h 2 PO 4 Dissolved in 16g of water. Then 15 g of urea were added. After the urea was completely dissolved, 58 g of polyvinyl acetate emulsion DPN15 was combined with it and 0.5 g of antifoam SRE (1:4) was added.
Embodiment 3
[0064] 4.48g AlCl 3 , 1.12g Al 2 (SO 4 ) 3 and 4.4g NH 4 h 2 PO 4 Mix with 28g of water. After complete dissolution, add 60g of polyvinyl acetate emulsion DPN15. Then 1.5 g polypropylene glycol 400 and 0.5 g SRE (1:4) were added. Example 4
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Abstract
A curing agent for urea-formaldehyde and urea-melamine-formaldehyde-based adhesives includes polyvinyl acetate emulsions and metal chlorides and ammonium salts. Adhesive compositions comprising urea-formaldehyde or urea-melamine-formaldehyde resins and the aforementioned curing agents provide faster cure speeds, acceptable viscosities, better adhesion, and greater tolerance to substrate types.
Description
technical field [0001] The invention relates to a curing agent for urea-formaldehyde and urea-melamine-formaldehyde based adhesives. The present invention further relates to an adhesive composition comprising a urea-formaldehyde or urea-melamine-formaldehyde resin and a curing agent thereof, which provides faster cure speed, better adhesion and better performance than prior art adhesives. Wide range of uses. Furthermore, the present invention allows the resin:curing agent ratio to be varied over a wide range without compromising the quality of the resulting bond. [0002] The invention also relates to the use of the curing agent for curing urea-formaldehyde or urea-melamine-formaldehyde resins. Background technique [0003] Urea-formaldehyde (UF) resins and urea-melamine-formaldehyde (UMF) resins are widely used in industry for bonding wood and as adhesives for the production of wood-based materials (including particleboard, plywood and various fiberboards), reinforced for...
Claims
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IPC IPC(8): C09J161/24C09J161/28
CPCC09J161/24C09J161/28
Inventor B·安德森B·G·布雷默
Owner F HEIMANN