CN104673171A - Wood adhesive for laminated wood and laminwood and preparation method of wood adhesive - Google Patents
Wood adhesive for laminated wood and laminwood and preparation method of wood adhesive Download PDFInfo
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- CN104673171A CN104673171A CN201510107898.7A CN201510107898A CN104673171A CN 104673171 A CN104673171 A CN 104673171A CN 201510107898 A CN201510107898 A CN 201510107898A CN 104673171 A CN104673171 A CN 104673171A
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Abstract
The invention relates to a wood adhesive for laminated wood and laminwood and a preparation method of the wood adhesive. The wood adhesive comprises a component A and a component B, wherein the preparation method for the component A comprises the following steps: adding cyclohexanone and a 37% formaldehyde solution into a reaction kettle, adjusting the pH value to be 10-11 with an alkaline solution, stirring, heating to be 80-100 DEG C, keeping the temperature to react for 2-5 hours after the system is clear, adding an organic acid to neutralize the pH value to be 7, and performing vacuum dehydration for 2-6 hours at 70-90 DEG C to obtain the component A; the preparation method for the component B comprises the following steps: adding the component A into the reaction kettle, adding polyaryl polymethylene isocyanate (PMDI), stirring, and heating to be 60-80 DEG C to react for 2-6 hours to obtain the component B. Before the wood adhesive is used, the component A and the component B are uniformly mixed according to the certain ratio, and a certain amount of wood powder can be added, then the wood adhesive can be used for adhering laminated wood and laminwood. The wood adhesive has the characteristics of high adhesion strength and normal-temperature curing, and is excellent in water resistance and durability.
Description
Technical field
The present invention relates to wood working and field of adhesive technology, specifically, relate to a kind of wood adhesive for cord-wood and laminated wood and preparation method thereof.
Background technology
China is the country that wood-based plate output is maximum in the world, and be also the maximum consumption of wood-based plate and importer, 2014 wood-based plate output have risen to 30212.33 ten thousand m
3.And China's forest coverage is lower, timber resources wretched insufficiency, artificial forest fast growing wood has become the main raw material of China's timber industry, and its application due to its wooden soft, drawbacks limit such as density is low, the artificial wood materials that can be used in structured material is little.Want to meet the domestic heavy demand to timber and timber-work, must efficiency utilization fast growing wood, greatly develop the artificial wood materials that can use as wooden structures.
Cord-wood is multilayer single plate is the sheet material of main assembly gummed by rift grain, compared with solid wood, and laminated veneer lumber even structure, be out of shape little, intensity is high; Laminated wood is with the solid sawn lumber compared with small dimension, and a kind of engineered wood of rift grain direction bonding, laminated wood intensity is high, even structure, and internal stress is little, not easy to crack and buckling deformation.Laminated wood and wooden I-shaped beam, cord-wood is all one of three kinds of main engineering material products, is the structural wood material effectively utilizing small dimension wood, fast growing wood, as structured material, the strongest to the substitutability of solid wood.
Tackiness agent is the gordian technique during cord-wood and laminated wood are produced, and requires that its tackiness agent has high strength, water-fast, weather-proof, durable, and possesses good processing performance.The water tolerance of a large amount of urea-formaldehyde adhesive, melamine-formaldehydadhesive adhesive and the polyvinyl acetate glue stick that use in present timber industry, weather resistance be poor, be difficult to the requirement meeting cord-wood and laminated wood, though common resol weather resistance and water tolerance etc. can reach requirement, but its solidification value is high, technique is difficult to realize.Therefore, exploitation is applicable to the ambient cure wood adhesive of cord-wood and laminated wood, to the application & development promoting this material, improves the utilising efficiency of China's timber, has positive meaning.
In the wood adhesive of ambient cure, resorcin phenolic resin has water-fast, weather-proof, the characteristic of high strength, can be used as glue cord-wood and laminated wood tackiness agent, but because the price of Resorcinol is always very high, limit its extent of spreading amd application, therefore generally can add phenol and carry out modification, as Wu Zhiping, Zhou Xianyan, describe in the disclosed patent " a kind of matrix resin and a kind of structure laminated wood stick with glue agent " (CN 103865018A) such as Liu Ting and first use phenol, after Resorcinol and formaldehyde carry out copolycondensation, add Resorcinol more in batches, obtain phenol-modified resorcinol-formaldehyde resin, solidifying agent (paraformaldehyde is added during use, vulkacit H or trimeric cyanamide).This tackiness agent has that intensity is high, good endurance, cost are lower than resorcinol-formaldehyde resin tackiness agent, normal temperature solidified feature.But this tackiness agent is when Resorcinol consumption is many, reduce costs not obvious, when consumption is less, solidification value can corresponding rising, cause self-vulcanizing incomplete, the performance after adhesive solidification can be unstable with solidification value change, and solidifying agent is solid, in system, also unevenly can cause Adhensive performance bad stability owing to mixing, limit its range of application.
Since last century the eighties, urethane also starts to use as wood adhesive, and because it has the advantage that Joint strength is high, water tolerance, weather resistance and weather resistance are excellent, the application in wood working is increasingly extensive.As Huntsman Corporation of U.S. invention disclosed patent (CN 101687348B) " a kind of method of tackiness agent and this adhesive producing lignocellulose composites of use " in 2010, describe with the mixing of polyether glycol, poly methylene poly phenyl poly isocyanate (hereinafter referred to as PMDI) and emulsified olefin, obtain a kind of wood adhesive can producing oriented wood chipboard, this tackiness agent is not containing formaldehyde, intensity is high, but hot pressing temperature will more than 100 DEG C.Wood single-component moisture curing polyurethane adhesive is described in palace great waves in 2010, willow bamboo, Bai Guifeng invention disclosed patent (CN 101701142B) " Wood single-component moisture curing polyurethane adhesive and preparation method thereof ", chain expansion of succinic acid is added with after polyoxypropyleneglycol and poly-diphenylmethanediisocyanate hybrid reaction, obtain isocyano end group monocomponent moisture cure urethanes adhesive, be mainly used in wood-based plate processing, to obtain the sheet material without aldehyde.Wang Zhiling etc. 2011 invention disclosed patent (CN 101967363A) " a kind of isocyanic ester/PET water miscible liquid tackiness agent and preparation thereof " describes and adopts recycled PET (PET), neopentyl glycol, maleic anhydride etc. to prepare PET water miscible liquid, during use, the PET water miscible liquid of independent packing and PMDI mixed at room temperature are obtained isocyanic ester/PET water miscible liquid tackiness agent and be used for the bonding of timber, this patent with reclaim PET for raw material, prepare polyurethane wood adhesive, but solidification value is still more than 100 DEG C.In male 2011 of Wu Ziliang, Luo Wei invention disclosed patent (CN 102093835A) " a kind of preparation of one-component vinyl polyurethane emulsion adhesive ", tackiness agent is at room temperature by modified vinyl polymers emulsion and the direct hybrid reaction of isocyanic ester, add the combinations such as kaolin and obtain, can be used for jigsaw, finger and assembling etc., because major ingredient is vinyl polymer emulsions, isocyanic ester is just used as linking agent, therefore is difficult to use as sqtructural adhesive.
Current China is used for the sqtructural adhesive of cord-wood and laminated wood, or based on resorcinol-formaldehyde or modified epoxy paint, and there are more aforesaid problems in this class tackiness agent, makes its application have certain limitation.Polyurethane adhesive has with the Joint strength of timber high, and water tolerance and weathering resistance are good, and through performance adjusts, can as the sqtructural adhesive of cord-wood and laminated wood.
Summary of the invention
The object of the present invention is to provide a kind of wood adhesive for cord-wood and laminated wood and preparation method thereof.Tackiness agent comprises A, B two main ingredients, and component A is the reaction product of pimelinketone and formaldehyde, and B component is the reaction product of component A and PMDI gained.The preparation technology of tackiness agent is simple, preparation method reliable, and environmental pollution is little.
Its preparation method comprises the following steps:
1, component A preparation method
(1) pimelinketone is added in reactor, adds the formalin of 37%, the ratio of quality and the number of copies of pimelinketone, dihydroxyphenyl propane and formaldehyde such as under:
Pimelinketone 100 parts
37% formaldehyde 120-150 part
(2) be 10-11 by the aqueous solution adjust ph of alkali, stir and be warming up to 80-100 DEG C, until system become clear after, keep thermotonus 2-5h; Described alkali is the one in sodium hydroxide, potassium hydroxide or sodium carbonate (soda ash);
(3) adding that organic acid carries out being neutralized to pH is 7,90-120 DEG C, be about vacuum hydro-extraction 2-6h under-0.09MPa (gauge pressure), be cooled to less than 40 DEG C, discharging obtains component A; Described organic acid is the one in formic acid, acetic acid, oxalic acid.
2, the preparation method of B component
(1) component A is added in reactor, adds PMDI, stir and be warming up to 60-80 DEG C of reaction times 2-6h;
(2) be cooled to less than 40 DEG C, discharging obtains B component.The ratio of quality and the number of copies of component A, PMDI such as under:
Component A 100 parts
PMDI 120-160 part
3, the preparation method of tackiness agent
By A, B component mixing, add a certain amount of wood powder, stir, obtain tackiness agent, this tackiness agent can be used for the ambient cure sqtructural adhesive of cord-wood and laminated wood.The ratio of quality and the number of copies of A, B component and filler wood powder such as under:
Component A 100 parts
B component 180-220 part
Wood powder 4-6 part
Tackiness agent of the present invention has following feature:
(1) Joint strength of tackiness agent is high, and water tolerance, weathering resistance are good, can as the sqtructural adhesive of cord-wood and laminated wood;
(2) adopt two-pack, wherein B component component A and PMDI obtain after reacting, and its stability in storage improves greatly, and the shelf lives can reach more than 1 year;
(3) normal temperature solidified, suitability is strong, and the molecular weight of A, B component can adjust as required, can meet the requirement of Various Seasonal and different areas;
(4) solvent-free in tackiness agent, during solidification, paint having no volatile substances produces, to working space non-environmental-pollution;
(5) modest viscosity, in use, can adopt the multiple resin application methods such as glue spraying, brush coating;
(6) production of adhesive technique is simple, in preparation process, without " three wastes " discharge.
Embodiment
In order to better set forth technology disclosed in this invention, further illustrated by following examples.
Embodiment 1
The preparation method of component A
By pimelinketone 1000kg, 37% formalin 1400kg be added in reactor, be 10-11 by 30% aqueous sodium hydroxide solution adjust ph, stirring is warming up to 90 DEG C, observing response system becomes clearly, keep thermotonus 3h, adding industrial acetic, to be neutralized to pH be 7,100 DEG C, be about under-0.09MPa (gauge pressure) after vacuum hydro-extraction 4h, cooling, filter discharging and obtain component A.
The preparation method of B component
Be added in reactor by the component A of 1000kg, add the PMDI of 1500kg, stir and be warming up to 70 DEG C of reaction 4h, be cooled to less than 40 DEG C, discharging obtains B component.
The compound method of tackiness agent
Before use the wood powder below 100 mass parts component A, 180 mass parts B component and 4 mass parts fineness 200 orders is mixed, can be used for the bonding of cord-wood and laminated wood.
Embodiment 2
The preparation method of component A
By pimelinketone 1000kg, 37% formalin 1200kg be added in reactor, be 10-11 by 30% potassium hydroxide aqueous solution adjust ph, stirring is warming up to 100 DEG C, observing response system becomes clearly, keep thermotonus 2h, adding industrial ethanedioic acid, to be neutralized to pH be 7,120 DEG C, be about under-0.09MPa (gauge pressure) after vacuum hydro-extraction 2h, cooling, filter discharging and obtain component A.
The preparation method of B component
Be added in reactor by the component A of 1000kg, add the PMDI of 1200kg, stir and be warming up to 80 DEG C of reaction 2h, be cooled to less than 40 DEG C, discharging obtains B component.
The compound method of tackiness agent
Before use the wood powder below 100 mass parts component A, 220 mass parts B component and 5 mass parts fineness 200 orders is mixed, can be used for the bonding of cord-wood and laminated wood.
Embodiment 3
The preparation method of component A
By pimelinketone 1000kg, 37% formalin 1500kg be added in reactor, be 10-11 by saturated aqueous sodium carbonate adjust ph, stirring is warming up to 80 DEG C, observing response system becomes clearly, keep thermotonus 5h, adding industrial formic acid, to be neutralized to pH be 7,90 DEG C, be about under-0.09MPa (gauge pressure) after vacuum hydro-extraction 6h, cooling, filter discharging and obtain component A.
The preparation method of B component
Be added in reactor by the component A of 1000kg, add the PMDI of 1600kg, stir and be warming up to 60 DEG C of reaction 6h, be cooled to less than 40 DEG C, discharging obtains B component.
The compound method of tackiness agent
Before use the wood powder below 100 mass parts component A, 180 mass parts B component and 6 mass parts fineness 200 orders is mixed, can be used for the bonding of cord-wood and laminated wood.
Embodiment 4
The preparation method of component A
By pimelinketone 1000kg, 37% formalin 1300kg be added in reactor, be 10-11 by 30% aqueous sodium hydroxide solution adjust ph, stirring is warming up to 90 DEG C, observing response system becomes clearly, keep thermotonus 4h, adding industrial acetic, to be neutralized to pH be 7,110 DEG C, be about under-0.09MPa (gauge pressure) after vacuum hydro-extraction 3h, cooling, filter discharging and obtain component A.
The preparation method of B component
Be added in reactor by the component A of 1000kg, add the PMDI of 1400kg, stir and be warming up to 80 DEG C of reaction 4h, be cooled to less than 40 DEG C, discharging obtains B component.
The compound method of tackiness agent
Before use the wood powder below 100 mass parts component A, 210 mass parts B component and 4 mass parts fineness 200 orders is mixed, can be used for the bonding of cord-wood and laminated wood.
Embodiment 5
The preparation method of component A
By pimelinketone 1000kg, 37% formalin 1400kg be added in reactor, be 10-11 by saturated aqueous sodium carbonate adjust ph, stirring is warming up to 100 DEG C, observing response system becomes clearly, keep thermotonus 3h, adding industrial ethanedioic acid, to be neutralized to pH be 7,100 DEG C, be about under-0.09MPa (gauge pressure) after vacuum hydro-extraction 5h, cooling, filter discharging and obtain component A.
The preparation method of B component
Be added in reactor by the component A of 1000kg, add the PMDI of 1300kg, stir and be warming up to 70 DEG C of reaction 5h, be cooled to less than 40 DEG C, discharging obtains B component.
The compound method of tackiness agent
Before use the wood powder below 100 mass parts component A, 190 mass parts B component and 5 mass parts fineness 200 orders is mixed, can be used for the bonding of cord-wood and laminated wood.
Eucalyptus veneer length is 100-600mm, and thickness is 2mm, by 160-220g/m
2tackiness agent in coating above-described embodiment, rift grain assembly stacks 12 layers, and at 25 DEG C, cure under pressure 24h, obtains laminated veneer lumber, and according to regulation in " GB/T 20241-2006 laminated veneer lumber ", test lamination wood property energy, the results are shown in Table 1.
Tackiness agent is evenly applied to bonded wood surface, and Amount of spread is at 150-200g/m
2at 25 DEG C of temperature, cure under pressure 24 hours, requires to test according to I level tackiness agent in structure glue 3.2.5 in " GB/T 50708-2012 laminated structure technical specifications ", in shearing resistance, I level tackiness agent A1 standard is pressed in dry strength test, and A is pressed in wet tenacity test
4standard, the results are shown in Table 2.
Table 1 cord-wood performance table
From table 1, by the performance of the Eucalyptus cord-wood of embodiment production of adhesive, MOR is all more than 41MPa, reach the premium grads level of this rank, shearing resistance comprises vertical loading and horizontal addload all more than 50V-43H, illustrates that tackiness agent prepared by the present invention can meet the requirement of cord-wood.
Table 2 laminated wood sticks with glue agent performance table
From table 2, in embodiment, Adhensive performance all sticks with glue agent regulation performance index more than showing 3.2.5 load larrying member in GB/T 50708-2012, illustrates that tackiness agent prepared by the present invention can meet the requirement of laminated wood to tackiness agent.
Claims (4)
1. ambient cure wood structure tackiness agent for cord-wood and laminated wood and preparation method thereof, this tackiness agent comprises A, B two components and wood powder composition, it is characterized in that component A is the reaction product of pimelinketone and formaldehyde, B component is the reaction product of component A and poly methylene poly phenyl poly isocyanate (PMDI) gained.
2. the preparation method of component A according to claim 1 comprises the following steps:
(1) pimelinketone is added in reactor, adds the formalin of 37%, the ratio of quality and the number of copies of pimelinketone and formaldehyde such as under:
Pimelinketone 100 parts
37% formaldehyde 120-150 part
(2) be 10-11 by the aqueous solution adjust ph of alkali, stir and be warming up to 80-100 DEG C, until system become clear after, keep thermotonus 2-5h; Described alkali is the one in sodium hydroxide, potassium hydroxide, sodium carbonate (soda ash);
(3) adding that organic acid carries out being neutralized to pH is 7, vacuum hydro-extraction 2-6h under 90-120 DEG C, about-0.09MPa (gauge pressure), and be cooled to less than 40 DEG C, discharging obtains component A; Described organic acid is the one in formic acid, acetic acid, oxalic acid.
3. the preparation method of B component according to claim 1 comprises and is added in reactor by component A, add poly methylene poly phenyl poly isocyanate (PMDI), stirring is warming up to 60-80 DEG C of reaction times 2-6h, and be cooled to less than 40 DEG C, discharging obtains B component.The ratio of quality and the number of copies of component A, poly methylene poly phenyl poly isocyanate (PMDI) such as under:
Component A 100 parts
PMDI 120-160 part.
4. A, B component and wood powder described in claim 2,3 are mixed, can be used for the cold setting adhesive of cord-wood and laminated wood.The ratio of quality and the number of copies of A, B component and filler wood powder such as under:
Component A 100 parts
B component 180-220 part
Wood powder 4-6 part.
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| CN201510107898.7A CN104673171A (en) | 2015-03-12 | 2015-03-12 | Wood adhesive for laminated wood and laminwood and preparation method of wood adhesive |
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| CN201510107898.7A CN104673171A (en) | 2015-03-12 | 2015-03-12 | Wood adhesive for laminated wood and laminwood and preparation method of wood adhesive |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444479A (en) * | 2021-05-13 | 2021-09-28 | 广西大学 | Preparation method of lignin-based formaldehyde-free adhesive |
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| CN1597724A (en) * | 2003-08-22 | 2005-03-23 | 德古萨公司 | Method for preparation of ketone diaion |
| WO2005052084A1 (en) * | 2003-11-20 | 2005-06-09 | Dynea Erkner Gmbh | Bonding agent for producing and bonding wood materials and/or fibrous materials and use thereof |
| CN101007862A (en) * | 2005-09-26 | 2007-08-01 | 德古萨公司 | Non-melting reaction products having a high glass transition temperature and low solution viscosity |
-
2015
- 2015-03-12 CN CN201510107898.7A patent/CN104673171A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597724A (en) * | 2003-08-22 | 2005-03-23 | 德古萨公司 | Method for preparation of ketone diaion |
| WO2005052084A1 (en) * | 2003-11-20 | 2005-06-09 | Dynea Erkner Gmbh | Bonding agent for producing and bonding wood materials and/or fibrous materials and use thereof |
| CN101007862A (en) * | 2005-09-26 | 2007-08-01 | 德古萨公司 | Non-melting reaction products having a high glass transition temperature and low solution viscosity |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444479A (en) * | 2021-05-13 | 2021-09-28 | 广西大学 | Preparation method of lignin-based formaldehyde-free adhesive |
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Application publication date: 20150603 |