Summary of the invention
The purpose of this invention is to provide a kind of formaldehyde-free wood adhesive, discharge, improve the bond strength and the water tolerance of tackiness agent simultaneously with the formaldehyde of stopping tackiness agent.
Another object of the present invention provides a kind of preparation method of formaldehyde-free wood adhesive.
In order to realize above purpose, the technical solution adopted in the present invention is: a kind of formaldehyde-free wood adhesive, form by following components in weight percentage: water 0-94.8%, mixed plant protein powder 5-99.8%, PPE-N 0.1-94.9%, sanitas 0.05-5%, pH regulator agent 0-15%, tackifier 0-10%, frostproofer 0.05-15% and filler 0-20%; Wherein said egg mix white powder is defatted soy flour and degreasing Semen Pisi sativi protein powder or degreasing cottonseed meal powder or degreasing castor-oil plant dregs of rice powder according to (1-5): the mixture of 1 weight ratio; Described PPE-N is formed by daiamid epoxy chloropropane and urea production.
Formaldehyde-free wood adhesive preferred version of the present invention is: water 0-62%, mixed plant protein powder 21-63%, PPE-N 10-50%, sanitas 0.4-2.3%, pH regulator agent 0-2.5%, tackifier 0-6.2%, frostproofer 0.2-8% and filler 0-15 %; Wherein said mixed plant protein powder is defatted soy flour and degreasing Semen Pisi sativi protein powder or degreasing cottonseed meal powder or degreasing castor-oil plant dregs of rice powder according to (1-2.5): the mixture of 1 weight ratio.
Protein content in the described mixed plant protein powder is 35-55%.
The weight percent of urea is 0.01-50% among the described PPE-N.
Described PPE-N is made by following method: daiamid epoxy chloropropane and urea are at room temperature mixed, continue stirring and obtained PPE-N in 0.5-5 hour.
Described sanitas is a kind of or its arbitrary combination in potassium sorbate, Sodium Benzoate, borax, TB10 strong fungicide, sodium bisulfite, sodium sulphite anhydrous 99.3, Sodium Pyrosulfite, the BIT sanitas.
Described pH regulator agent is acid or alkali commonly used.
Described tackifier are a kind of or its arbitrary combination in Xylo-Mucine, polyvinyl alcohol, isocyanic ester, water-based isocyanate, polyacrylamide, vinyl acetate, carboxylic styrene butadiene latex, vinyl acetate emulsion, acrylic ester emulsion, starch, treated starch, the flour.
Described frostproofer is a kind of or its arbitrary combination in ethylene glycol, glycerine, acetone, propyl carbinol, isopropylcarbinol, the calcium chloride.
Described filler is a kind of or its arbitrary combination in diatomite, kaolin, wilkinite, talcum powder, glass silk floss, rock wool, glass powder, fine sand, sawdust, whole meal flour, nutshell powder, tree bark powder, Mierocrystalline cellulose, the xylogen.
The preparation method of formaldehyde-free wood adhesive of the present invention is: at first prepare PPE-N, stirring under normal temperature, lasting agitation condition obtained in 0.5-5 hour with PPE and urea; Secondly PPE-N, mixed plant protein powder, sanitas, frostproofer and other raw material are added respectively in the container that has agitator, reinforced interval keeps 5-60 minute stirring; Carry out homogenization treatment or spraying drying at last and obtain liquid state or powdery formaldehyde-free wood adhesive.
Daiamid epoxy chloropropane (Polyae-Polyamine-Epichlorohydrin; abbreviation PPE) be a kind of wet strength agent for papermaking; molecular weight is between 1000-200000; on hydrophobic polymeric amide long-chain, be connected with more branch's group on its molecular structure; epoxy group(ing) on branch's group and hydroxyl can with the part radical reaction in the albumen; protein is played a very good protection, thus the water tolerance of raising tackiness agent.It is the raw material production tackiness agent that the present invention adopts PPE-N, is improving the bonding strength that further improves tackiness agent on the water-proof basis, and the consumption of minimizing PPE that can be indirect, thereby reduces production cost.
The raw material that wood adhesive of the present invention adopted is formaldehydeless raw material, and also formaldehydeless release in tackiness agent and artificial board production process can produce the E of burst size of methanal far below 0.5mg/L
0The artificial board of rank (GB/T 9846.3-2004), trace formaldehyde contained in the artificial board product be all from wood raw material itself, thereby fundamentally solved the release problem of formaldehyde.In addition, formaldehyde-free wood adhesive raw material of the present invention is simple and easy to, and the preparation method is simple to operate, and production cost is lower, is fit to suitability for industrialized production.
The present invention adds single protein powder (defatted soy flour) and mixed plant protein powder with PPE, is following contrast experiment.
1, the detection of insolubles:
Detection method: with tackiness agent at 110 ℃ of oven dry W that weighs then
1, in 63 ℃ water, soaked 1 hour then, 110 ℃ of oven dry, W weighs
2Insolubles=(W
1-W
2)/W
1* 100%.Final detected result is as shown in table 1:
Table 1: insolubles detected result
Sequence number |
Main ingredient |
The set of dispense ratio |
Insolubles |
1 |
PPE+ defatted soy flour+water |
50:60:100 |
60% |
2 |
PPE+ defatted soy flour+degreasing castor-oil plant dregs of rice powder+water |
50:30:30:100 |
75% |
3 |
PPE-N+ defatted soy flour+degreasing castor-oil plant dregs of rice powder+water |
50:30:30:100 |
81% |
From the detected result of No. 1 and No. 2 as can be seen, tackiness agent of the present invention adopts the mixed plant protein raw material can improve the content of insolubles significantly, avoid this more material of stripping after the immersion of hot water of tackiness agent, therefore the water tolerance of tackiness agent of the present invention improves greatly; And from the detected result of No. 2 and No. 3 as can be seen, the present invention adopts PPE-N can further improve the water tolerance of tackiness agent.
2, glued board test:
Adopt above-mentioned 3 kinds of tackiness agent to prepare glued board, wherein the method for stipulating among standard GB/T 9846.3-2004 is adopted in the detection of the bonding strength of glued board, be about to soak 3 hours in the hot water that test specimen is placed on 63 ± 3 ℃, at room temperature cool off 10min, detected intensity then after the taking-up.Final detected result is as shown in table 2, and wherein Zhi Bei glued board thickness is 5mm.
Table 2: glued board gummed intensity data
Sequence number |
Dry glue intensity |
Wet bonding strength |
Hot pressing time |
1 |
1.1Mpa |
0.45Mpa |
5 minutes |
2 |
1.5Mpa |
0.65Mpa |
4 minutes |
3 |
1.7Mpa |
0.86Mpa |
3.5 minute |
According to table 2 column data as can be seen, tackiness agent of the present invention adopts the mixed plant protein raw material can significantly improve the dry glue intensity and the wet bonding strength of glued board, can be used to produce the glued board of national standard I I class, III class.In the preparation process of glued board, adopt tackiness agent of the present invention can shorten hot pressing time in addition, improve the production efficiency of glued board.
Embodiment
Contrast the detailed description of technical scheme of the present invention below in conjunction with specific embodiment.Wherein the preparation method of the PPE-N that is adopted is: PPE and urea are at the uniform velocity stirred under the agitation condition 30 ~ 60 rev/mins of normal temperature, rotating speed obtained PPE-N in 0.5 ~ 5 hour.
Embodiment 1
The component concentration and the preparation method of the formaldehyde-free wood adhesive of present embodiment are as follows:
120 gram water are put into the container of belt stirrer, the control stir speed (S.S.) is 50 ~ 200 rev/mins, add PPE-N(urea 0.1% then successively) 30 grams, defatted soy flour 35 grams and degreasing castor-oil plant dregs of rice powder 15 grams, citric acid 2 grams, potassium sorbate 1 gram, diatomite 5 grams, the reinforced lasting stirring that keeps 5-60 minute at interval according to feeding quantity is carried out homogenization treatment with colloidal mill at last and (is preferably added a little calcium hydroxide solidifying agent in use, adjust pH to neutral), promptly get formaldehyde-free wood adhesive.Wherein the protein content in defatted soy flour and the degreasing castor-oil plant dregs of rice powder is 35%.
Embodiment 2
The component concentration and the preparation method of the formaldehyde-free wood adhesive of present embodiment are as follows:
120 gram tap water are put into the container of belt stirrer, the control stir speed (S.S.) is 50 ~ 200 rev/mins, add PPE-N(urea content 50% then successively) 30 grams, defatted soy flour 30 grams and degreasing cottonseed meal powder 20 grams, citric acid 2 grams, potassium sorbate 2 grams, and glycerine 2 grams, the reinforced lasting stirring that keeps 5-60 minute at interval according to feeding quantity is handled the back spraying drying with colloidal mill and high pressure homogenizer at last, promptly gets the pulvis of formaldehyde-free wood adhesive.Wherein the protein content in defatted soy flour and the degreasing cottonseed meal powder is 40%.
Embodiment 3
The component concentration and the preparation method of the formaldehyde-free wood adhesive of present embodiment are as follows:
100 gram tap water are put into the container of belt stirrer, the control stir speed (S.S.) is 50 ~ 200 rev/mins, add PPE-N(urea 8% then successively) 50 grams, defatted soy flour 40 grams and degreasing Semen Pisi sativi protein powder 20 grams, sodium hydroxide 0.5 gram, sodium bisulfite 1 gram, and calcium chloride 1 gram, the reinforced lasting stirring that keeps 5-60 minute at interval according to feeding quantity stirs, and promptly gets formaldehyde-free wood adhesive.Wherein the protein content in defatted soy flour and the degreasing Semen Pisi sativi protein powder is 50%.
Embodiment 4
The component concentration and the preparation method of the formaldehyde-free wood adhesive of present embodiment are as follows:
100 gram tap water are put into the container of belt stirrer, the control stir speed (S.S.) is 50 ~ 200 rev/mins, add PPE-N(urea 6% then successively) 50 grams, defatted soy flour 35 grams and degreasing Semen Pisi sativi protein powder 20 grams, ethylene glycol 2.5 grams, BIT sanitas 1 gram, flour 6 grams, the reinforced lasting stirring that keeps 5-60 minute at interval according to feeding quantity stirs, and promptly gets formaldehyde-free wood adhesive.Wherein the protein content in defatted soy flour and the degreasing Semen Pisi sativi protein powder is 55%.
Wood adhesive among the embodiment 1-4 can be made flow-like or powdered tackiness agent.
Formaldehydeless protein-based wood adhesive of the present invention is when being applied to plywood production, and is the same with normal urea-formaldehyde glue using method, uses spreadometer or hairbrush double spread equably, organizes embryo arrangement, precompressed then or do not carry out precompressed, hot pressing.Hot compression parameters is 110 ~ 170 ℃, and pressure is 10 ~ 20 kilograms/cm
2
Tackiness agent of the present invention can be applied to the artificial board of all kinds, as glued board, core-board, oriented wood chipboard (OSB), shaving board, medium density fibre board (MDF), high density fiberboard, face artificial board etc., below be that example is carried out performance test to the tackiness agent of above-mentioned 4 embodiment and the glued board of application thereof with the glued board, its result is as shown in table 3, and wherein the timber of glued board employing is poplar.
The experimental result of table 3 embodiment 1-4