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Aqueous sealant system, wood product and method for sealing wood substrate

A water-based sealing agent and system technology, applied in wood impregnation, wood treatment, impregnated wood, etc., can solve the problems of difficult to control cross-linking reaction, complicated preparation method of water-based sealing agent, high manufacturing cost, etc., and achieve excellent physical and chemical properties, Excellent sealing or barrier properties, long-lasting sealing effect

Inactive Publication Date: 2011-07-06
GUANGDONG HUARUN PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the water-based sealing agent proposed above can produce a sealing layer with high sealing performance and excellent mechanical properties, since the crosslinking reaction depends on the volatilization rate of the neutralizing agent, it depends to a large extent on factors such as temperature, pressure and Many external factors such as humidity make it difficult to control the crosslinking reaction
Moreover, the preparation method of this aqueous sealant based on acrylate copolymer emulsion is also quite complicated, and the manufacturing cost is quite high

Method used

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  • Aqueous sealant system, wood product and method for sealing wood substrate

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preparation example Construction

[0044] The preparation of the film-forming resin composition of the present invention can be realized by any suitable mixing method known to those skilled in the art. For example, a film-forming resin composition can be prepared by adding the aqueous emulsion, fillers and additional additives (if any) to a container, and stirring the resulting mixture until homogeneous. Additional water may be added during the preparation of the film-forming resin composition, if desired. The amount of additional water should be added to the total weight of the aqueous emulsion.

[0045] As used herein, the term "polyisocyanate hardener" refers to polyisocyanate compounds, isocyanate oligomers, or combinations thereof. The polyisocyanate hardener contains two or more isocyanate functional groups, which can undergo chain extension and crosslinking reactions with active hydrogen polymers, thereby forming a three-dimensional network structure in the seal coat.

[0046] Suitable polyisocyanate h...

Embodiment 1

[0094] Preparation of film-forming resin composition

[0095] 20kg Vinnapas 420, 0.4kg Dispers 760W, 0.5kg BYK 024, 3kg ethylene glycol, 16.4kg water and 0.2kg fungicide were added to the mixing vessel and mixed, then stirred at 300-600rpm until homogeneous. Next, 2 kg of R-706, 58 kg of MJ-2000 and 0.5 kg of RM-8W were added to the above mixture under stirring. The resulting mixture was stirred for 15-20 min, and then the pH regulator AMP-95 was slowly added dropwise to adjust the pH to 7-9. The result is a film-forming resin composition.

[0096] Preparation of an aqueous closed system

[0097] The film-forming resin composition thus prepared was mixed with PAPI 27 (a polymethylene polyphenyl polyisocyanate hardener from DOW Corporation) in a weight ratio of 100:9 before use.

[0098] Apply and evaluate aqueous sealer systems

[0099] Two oak boards (each with a size of 40cm×60cm) were polished with 400 mesh sandpaper to remove stains, burrs and dust on the surface...

Embodiment 2

[0104] Preparation of film-forming resin composition

[0105] 20kg Vinnapas 420, 0.4kg Dispers 760W, 0.5kg BYK 024, 3kg ethylene glycol, 16.4kg water and 0.2kg fungicide were added to the mixing vessel and mixed, then stirred at 300-600rpm until homogeneous. Next, 2 kg of R-706, 58 kg of MJ-2000 and 0.5 kg of RM-8W were added to the above mixture under stirring. The resulting mixture was stirred for 15-20 min, and then the pH regulator AMP-95 was slowly added dropwise to adjust the pH to 7-9. The result is a film-forming resin composition.

[0106] Preparation of an aqueous closed system

[0107] The film-forming resin composition thus prepared was mixed with PAPI 27 (polymethylene polyphenyl polyisocyanate hardener from DOW Corporation) in a weight ratio of 100:5 before use.

[0108] Apply and evaluate aqueous sealer systems

[0109] Two oak boards (each with a size of 40cm×60cm) were polished with 400 mesh sandpaper to remove stains, burrs and dust on the surface o...

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Abstract

The invention relates to an aqueous sealant system, a wood product and a method for sealing a wood substrate, in particular to an aqueous sealant system, a wood product sealed by the aqueous sealant system and a method for sealing a wood substrate by using the aqueous sealant system. The aqueous sealant system comprises: (a) a film forming resin composition which comprises an active hydrogen polymer-containing aqueous emulsion, a filler and an optionally-added additive, and (b) a polyisocyanates hardener, wherein the weight ratio of the film forming resin composition (a) to thepolyisocyanates hardener (b) is 100:3-100:10.

Description

technical field [0001] The present invention relates to an aqueous sealer system, and more particularly, to an aqueous sealer system for sealing wooden substrates such as natural wood substrates or wood-based panel substrates. The present invention also relates to a wood product sealed by the above-mentioned aqueous sealant system and a method for sealing a wooden substrate by using the above-mentioned aqueous sealant system. Background technique [0002] During the manufacture of wood products, it is usually necessary to apply a sealer to the wood substrate to effectively seal or block unwanted substances such as oil, tannin and other colored impurities contained in the wood substrate, thereby preventing The aforementioned substances migrate and seep onto the surface of the wood product. [0003] In recent years, water-based latex-based sealers have attracted increasing attention due to their environmental friendliness. Traditional water-based sealers mainly consist of wa...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D131/04C09D129/04B27K3/52B27K3/12B27K3/15B27K5/04B32B33/00
CPCC09D101/26C08K3/22C09D175/04C09D131/04C08J2397/02Y10T428/31551Y10T428/31591
Inventor 沙亚楠谢晓芳唐桂明石成芬段刚
Owner GUANGDONG HUARUN PAINT CO LTD
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