Formaldehyde-free wood adhesive and preparation method thereof

A technology of wood adhesive and formaldehyde, which is applied in the field of preparation of the formaldehyde-free wood adhesive, can solve problems such as health hazards, reduction of adhesive bonding strength, excessive formaldehyde content, etc., and achieve the effects of reducing dosage, low production cost, and improving water resistance

Inactive Publication Date: 2010-12-29
郑州宜康木业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, urea-formaldehyde resin is widely used because of its low price and excellent performance. However, since the raw materials for preparing urea-formaldehyde resin involve formaldehyde, formaldehyde will be released during the production and use of urea-formaldehyde resin, and the artificial board processed with urea-formaldehyde resin adhesive will also There is formaldehyde released, and the release period is 3 to 15 years, which leads to the long-term excessive formaldehyde content in the indoor air and causes serious harm to huma

Method used

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  • Formaldehyde-free wood adhesive and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] The component content and preparation method of the formaldehyde-free wood adhesive of the present embodiment are as follows:

[0032] Put 120 grams of water into a container with a stirrer, control the stirring rate to 50~200 rpm, then add 30 grams of PPE-N (0.1% urea), 35 grams of defatted soybean powder and 15 grams of defatted castor meal powder gram, 2 grams of citric acid, 1 gram of potassium sorbate, 5 grams of diatomaceous earth, the feeding interval is kept stirring continuously for 5-60 minutes according to the amount of feed, and finally homogenized with a colloid mill (it is best to add a little hydrogen when using Calcium oxide curing agent, adjust the pH to neutral), that is, a formaldehyde-free wood adhesive. Wherein the protein content in defatted soybean meal and defatted castor meal powder is 35%.

Embodiment ２

[0034] The component content and preparation method of the formaldehyde-free wood adhesive of the present embodiment are as follows:

[0035] Put 120 grams of tap water into a container with a stirrer, control the stirring rate to 50~200 rpm, then add 30 grams of PPE-N (50% urea content), 30 grams of defatted soybean powder and 20 grams of defatted cottonseed meal powder in sequence gram, 2 grams of citric acid, 2 grams of potassium sorbate, and 2 grams of glycerin. The feeding interval is kept stirring continuously for 5-60 minutes according to the amount of feeding, and finally treated with a colloid mill and a high-pressure homogenizer and then spray-dried to obtain formaldehyde-free Powder for wood adhesives. The protein content in defatted soy flour and defatted cottonseed meal is 40%.

Embodiment 3

[0037] The component content and preparation method of the formaldehyde-free wood adhesive of the present embodiment are as follows:

[0038] Put 100 grams of tap water into a container with a stirrer, control the stirring rate at 50~200 rpm, then add 50 grams of PPE-N (8% urea), 40 grams of defatted soybean powder and 20 grams of defatted pea protein powder , 0.5 grams of sodium hydroxide, 1 gram of sodium bisulfite, and 1 gram of calcium chloride. The feeding interval is kept for 5-60 minutes according to the amount of feeding, and the stirring is uniform to obtain a formaldehyde-free wood adhesive. The protein content in defatted soy flour and defatted pea protein powder is 50%.

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Abstract

The invention discloses a formaldehyde-free wood adhesive. The formaldehyde-free wood adhesive consists of the following components in percentage by weight: 0 to 94.8 percent of water, 5 to 99.8 percent of mixed vegetable protein powder, 0.1 to 94.9 percent of PPE-N, 0.05 to 5 percent of preservative, 0 to 15 percent of pH regulator, 0 to 10 percent of thickening agent, 0.05 to 15 percent of antifreeze and 0 to 20 percent of filler, wherein the mixed vegetable protein powder is a mixture formed from defatted soybean powder and defatted pea protein powder or defatted cottonseed meal powder or defatted castor meal powder in a weight ratio of (1-5):1; and the PPE-N is prepared from polyamide epichlorohydrin and urea. The wood adhesive of the invention adopts formaldehyde-free raw materials, so no formaldehyde is released in the production processes of the adhesive and an artificial sheet material; and an E0-level (GB/T9846.3-2004) artificial sheet material of which the formaldehyde release amount is far less than 0.5mg/L can be produced; and all trance formaldehyde in an artificial sheet material product is from a wood raw material per se, so that the problem of the release of the formaldehyde is solved fundamentally.

Description

technical field [0001] The invention relates to a formaldehyde-free wood adhesive, and also relates to a preparation method of the formaldehyde-free wood adhesive. Background technique [0002] The formaldehyde contained in wood-based panel products mainly comes from adhesives, except for trace amounts from the wood raw materials themselves. At present, adhesives are widely used in the wood processing industry, such as plywood, large core board, fiberboard and particle board, etc. The adhesives used are mainly "trialdehyde glue", that is, urea-formaldehyde resin, phenolic resin and melamine formaldehyde resin. Among them, urea-formaldehyde resin is widely used because of its low price and excellent performance. However, since the raw materials for preparing urea-formaldehyde resin involve formaldehyde, formaldehyde will be released during the production and use of urea-formaldehyde resin, and the artificial board processed with urea-formaldehyde resin adhesive will also The...

Claims

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Application Information

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IPC IPC(8): C09J189/00C09J177/00
Inventor 田志壮
Owner 郑州宜康木业科技有限公司
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