Compositions and methods for resin-based wood glues

A composition and resin technology, applied in the direction of adhesives, inorganic adhesives, adhesive additives, etc., can solve the problems of adhesive properties such as loss of strength or solidification rate, and achieve the effect of easy transportation

Inactive Publication Date: 2009-08-26
PQ SILICAS UK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When mixed with existing resin-based adhesives, current diluents or extenders can cause a loss of desired properties of the adhesive such as strength or set rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1 - Extender Composition

[0062] Prepare the extender composition by mixing the following:

[0063] i) has a solids content of 45% in water and SiO 2 :Na 2 80% by weight sodium silicate solution with an O ratio of 2.22:1;

[0064] ii) 20% by weight crane sugar syrup with a sugar content of 76%.

[0065] The cane syrup is made from Brazilian Dulcini Invert sugar provided by Gludex 201.

[0066] The resulting composition is a homogeneous clear liquid at 25°C, suitable for delivery and use as an extender for resin-based adhesives.

[0067] Example 2 - Glue

[0068] The glue is formed by mixing the following:

[0069] i) 21.4% by weight phenolic resin solution (50% by weight phenol formaldehyde, 50% by weight water) supplied by BAQ Brazil as Baqphen 4051-3;

[0070] ii) 50% by weight of the extender composition of Example 1;

[0071] iii) 14.3% by weight of water;

[0072] iv) 14.3% by weight of wheat flour.

[0073] The resulting composition is as fo...

Embodiment 4

[0094] Example 4 - Extender Composition

[0095] Prepare the extender composition by mixing the following

[0096] i) has a solids content of 45% in water and SiO 2 :Na 2 A 90% by weight sodium silicate solution with an O ratio of 2.15:1;

[0097] ii) 10% by weight cane syrup with a sugar content of 76%.

[0098] The cane syrup is made from Brazilian Dulcini Invert sugar provided by Gludex 201.

[0099] The resulting composition is a homogeneous clear liquid at 25°C, suitable for delivery and use as an extender for resin-based adhesives.

Embodiment 5

[0100] Example 5 - Glue and Plywood

[0101] Glue 5A and 5B were prepared for two types of plywood. Glue 5A is a wood glue of the invention, while glue 5B is not a wood glue of the invention. The details of the two glues are given below:

[0102] Glue 5A (the present invention)

[0103] 57% phenolic resin solution (as detailed above, 50% by weight phenol formaldehyde resin, 50% by weight water);

[0104] 14.33% of the extender composition of Example 4;

[0105] 14.33% wheat flour;

[0106] 14.33% water.

[0107] This gives the resulting composition of 5A:

[0108] Phenolic resin 28.5%

[0109] Sodium silicate 5.80%

[0110] Sugar 1.09%

[0111] Wheat Flour 14.33%

[0112] Water + trace ingredients to 100%.

[0113] Glue 5B (comparative example)

[0114] 71.33% phenolic resin solution (as detailed above, 50% by weight phenol formaldehyde resin, 50% by weight water);

[0115] 14.33% wheat flour;

[0116] 14.33% water.

[0117] This gives the resulting composition ...

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Abstract

A method for extending resin-based wood glues, particularly condensation polymer resin-based glues, comprises the steps of (i) providing an aqueous extender composition comprising 20% to 50% by weight of alkali metal silicate and 1 % to 25% by weight of polyhydric alcohol, preferably a sugar such as sucrose, (ii) providing a solution comprising a resin and (iii) blending the aqueous extender and the solution together to form a glue. The extended glues are suitable for preparing water resistant processed wooden panels such as plywood or chipboard with reduced need for resin. The extended glues do not set excessively rapidly, allowing time for the processing of the wood composites.

Description

technical field [0001] The present invention relates to extenders for use in glues used to bond natural materials such as wood, paper or fibres. It also relates to methods of manufacturing panels of glue, processed natural materials and panels themselves. Background technique [0002] Paper, wood and natural fibers are examples of natural materials (ie materials obtained from renewable resources) used to manufacture articles in the construction industry, furniture industry and general industry. [0003] Examples of products made of natural materials and widely used in the construction and furniture industry are wood-worked panels, such as plywood, particle board, medium-density fiberboard, and also wooden doors. [0004] Various types of trees can be used to make processed wooden panels, such as pine, eucalyptus, and tropical trees. [0005] The manufacturing method of the processed wooden board consists of several steps. In the case of plywood, the first step is to harde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J1/02C09J11/02C09J161/02
Inventor P·德阿尔梅迪亚·利马R·多斯桑托斯·弗洛尔
Owner PQ SILICAS UK
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