CN1884418A - Amino resin binding agent for preparing superstrong water-tight bamboo-wood sheet and sheet production process - Google Patents
Amino resin binding agent for preparing superstrong water-tight bamboo-wood sheet and sheet production process Download PDFInfo
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- CN1884418A CN1884418A CN 200610048407 CN200610048407A CN1884418A CN 1884418 A CN1884418 A CN 1884418A CN 200610048407 CN200610048407 CN 200610048407 CN 200610048407 A CN200610048407 A CN 200610048407A CN 1884418 A CN1884418 A CN 1884418A
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Abstract
The invention provides the amino resin adhesive agent and after-treatment technology. The method comprises the following steps: synthesizing urea-formaldehyde resin in strong acid system, making the urea-formaldehyde resin with active side chain structure; adding cross linking agent before applying glue, the plate discharging the compound with active group at the courts of heating and dispensing, improving the plate bonding strength and water resistance. The invention has the advantages of low cost and simple technology.
Description
Technical field:
The invention belongs to the manufacture field of bamboo and wood sheet material, is that a kind of use aldehydes and aminocompound are produced amino resin adhesive, is used to have the process for processing and the post-processing technology of superpower, water-fast bamboo and wood sheet material; Can apply to the process for processing of wood-based plates such as glued board, core-board, shaving board, fiberboard; The forming process that can also be used for stalk fiber board.
Background technology:
At water tolerance bamboo and wood sheet material, as: building template, container bottom board, automobile-used sheet material, the process for processing of reinforced composite wooden floor etc. is technical, uses the high tackiness agent of some water tolerance both at home and abroad always, as: resol, urethane, terpolycyantoamino-formaldehyde resin etc.These tackiness agent in the course of processing of sheet material, can with lumber fibre generation crosslinking reaction, form reticulated structure, thereby improved the water resistance of sheet material.But use these tackiness agent ubiquity cost height, expend problems such as a large amount of petrochemical complex resources.In tackiness agent is synthetic, use simultaneously a large amount of phenol, isocyanic ester, the industrial chemicals that toxicity such as trimeric cyanamide are bigger, contaminate environment not only, and endanger bigger to producers.Therefore, press for develop that cost is low, pollution is little, intensity is high, the novel adhesive of water-tolerant and sheet material processing technology.
Characteristics such as urea-formaldehyde resin adhesive has bonding strength preferably, and is colourless, and cost is low are the first-selected tackiness agent of wood working industry always.But the intensity of urea-formaldehyde resin adhesive is on the low side, and poor water resistance has limited its application on water tolerance bamboo and wood board materials production.Therefore, the current urea-formaldehyde resin base adhesive that do not adopt both at home and abroad when producing this class sheet material.
If can adopt proper technology, improve the over-all properties of urea-formaldehyde resin, make it have suitable intensity, can reach good water resistance again simultaneously, so just can solve the too high and big problem of consumption petrochemical industry resource of water-resisting type bamboo and wood sheet material tackiness agent cost.
Summary of the invention:
The invention provides a kind of production technology, sheet material processing and post-processing technology that is used for the aminoresin base adhesive of superpower, water-fast bamboo and wood board materials production.
The present invention by to the production technology of urea-formaldehyde resin adhesive, join the design of glue technology and sheet material post-processing technology and cooperatively interact, reach and improve urea-formaldehyde resin adhesive adhesive bonding of wood ability and water-proof purpose; The concrete technical scheme that is adopted is: (1) is synthetic urea-formaldehyde resin under the strong acid system, makes the urea-formaldehyde resin molecule have a large amount of active branched chain structures; (2) before the applying glue in tackiness agent with addition of an amount of efficient resting form linking agent, sheet material is discharging the compound with active group in the process of heating or placement, these compounds are playing crosslinked action between the urea-formaldehyde resin molecule and between urea-formaldehyde resin molecule and the lumber fibre in solidification process, thereby improve the bonding strength and the water tolerance of sheet material; (3) use precompressed-hot pressing, the aged technology of perhaps precompressed-heating (or normal temperature placement); (4) behind plate forming, use basic material to handle sheet material, improve the physical chemistry structure of glue-line, further improve the overall performance of sheet material.
Use the bamboo and wood sheet material of the technology of the present invention processing to have that cost is low, intensity is high, super water-fast, technology characteristic of simple; Be applicable to the process for processing of the bamboo and wood sheet material that requires to have enhanced water resistance and the process for processing of stalk fiber board.
Embodiment
Amino resin adhesive of the present invention is made by following method:
(1) the urea-formaldehyde resin base adhesive is synthetic:
At first, be 20～100 ℃ in temperature, the pH value is under 1～7 the condition, with aldehydes starting material and aminocompound with (8～1): 1 mol ratio is carried out polyreaction, and the reaction times is controlled at 5～120min; Then, use sodium hydroxide, yellow soda ash, the aqueous solution of potassium hydroxide or salt of wormwood is transferred to 7～10 with the pH value of reaction medium; Adding is (0.1～2) with aldehydes starting material mol ratio: 1 aminocompound; Adding simultaneously is (0～1.0) with aldehydes starting material mol ratio: 1 phenolic material; Controlling reaction time when cloud point occurring, is regulated pH value=8.0～8.5, stopped reaction; Be cooled to below 40 ℃ discharging.
The aldehydes starting material that use can be: one or more compounds in formaldehyde, trioxymethylene and the Paraformaldehyde 96, also can use the urea-formaldehyde resin concentrated solution; Employed aminocompound has: one or more materials in urea, thiocarbamide and the trimeric cyanamide; Employed phenolic material has: phenol, Resorcino, tannin or other polyphenol; In order to control the production cost of amino resin adhesive better, preferably use formaldehyde, urea and phenol as raw material.
Synthesis step: at first, be 20～100 ℃, be preferably 60～90 ℃ in temperature, the pH value is 1～7, be preferably under 2～3 the condition, with formaldehyde and urea with (8～1): 1, be preferably (5～2): 1 mol ratio is carried out polyreaction, reaction times is controlled at 5～120min, be preferably 10～40min then, use sodium hydroxide, yellow soda ash, the aqueous solution of potassium hydroxide or salt of wormwood etc. is transferred to 7～10 with the pH value of reaction medium, preferably transfers to 7～8; Adding is (0.1～2) with formaldehyde mole ratio: 1, be preferably (0.3～1): 1 urea; Adding simultaneously is (0～1.0) with formaldehyde mole ratio: 1, be preferably (0.1～0.5): 1 phenol; Controlling reaction time when cloud point (the 1ml reaction solution splashes in 20 ℃ the water and cloud occurs) occurring, is regulated pH value=8.0～8.5, stopped reaction; Be cooled to below 40 ℃ discharging.
Below be a kind of enforcement specific examples of the present invention, but the invention is not restricted to this example:
The adding mass concentration is 37% formaldehyde 1000Kg in reactor, regulates pH=7.0～7.5; Start stirring, heat up, controlled temperature is 50 ℃; Add urea 211.5Kg, after the dissolving fully, regulate pH=3.0, controlling reaction time 15 minutes; After reaction finishes, regulate pH=7.0～8.0, add 370Kg urea, the dissolving back adds 10Kg phenol; Be warming up to 80 ℃, the pH value of control reaction medium is 7.0～8.0; Reaction is to cloud point occurring, the about 200～400mPa.s of viscosity; Regulate pH value=8.0～8.5, be cooled to below 40 ℃ discharging.
Below be the another kind of specific embodiment of the present invention, but the present invention also is not limited to this example:
At first, be 70 ℃ in temperature, the pH value is under 2～3 the condition, formaldehyde and urea to be carried out polyreaction with 3: 1 mol ratio, the reaction times is controlled at 40min; Then, use sodium hydroxide, yellow soda ash, the aqueous solution of potassium hydroxide or salt of wormwood etc. is transferred to 7～8 with the pH value of reaction medium; Adding and formaldehyde mole ratio are 0.8: 1 urea; Adding and formaldehyde mole ratio are 0.4: 1 phenol simultaneously; Controlling reaction time when cloud point (the 1ml reaction solution splashes in 20 ℃ the water and cloud occurs) occurring, is regulated pH value=8.0～8.5, stopped reaction; Be cooled to below 40 ℃ discharging.
(2) technique for sticking
Tackiness agent 100Kg of the present invention is added in the Glue mixer, add active filler 1～70Kg then, active filler is as flour, wood powder, bean powder, tree bark powder, peanut hull meal etc.; Be stirred well to fully evenly, regulate 0.1＜pH＜7.0 of glue, be preferably 1.0＜pH＜6.0, add then that to account for the urea-formaldehyde resin mass percent be 0.01～20%, be preferably 0.1～5% carbamate crosslinker, its molecular formula is:
Wherein: R
1Be phenyl, tolyl, naphthyl, alkyl etc.;
R
2Be phenolic group, alcohol radical, imido grpup etc.
Can use the hot pressed processing condition of common precompressed-high temperature to carry out sheet material processing, use common glue applying method and resin added; Employed hot pressing temperature is 80～230 ℃; Pressure is: 0.5～3.0MPa; Hot pressing time: 5～120min;
Or use the aged processes sheet material of precompressed-heating (or normal temperature placement), and use this technology can save power consumption, hot pressing process consuming time, cut down the consumption of energy, enhance productivity.Specific implementation method is, uses above-mentioned gluing method and common glue applying method and the resin added of joining.At first implementing precompressed, is 0.5～3.0Mpa at pressure; Temperature is 0～230 ℃, is preferably room temperature; Squeeze time can be any time section, but is preferably 20～40min.Then, the sheet material behind the pre-molding can use temperature be 0～200 ℃, is preferably and places ageing under the room temperature condition, and digestion time can be preferably 48 hours for any time section.
(3) aftertreatment technology
In order further to improve the over-all properties of sheet material, employing is behind plate forming, sheet material is carried out aftertreatment, the concrete method that adopts is, use alkaline gas, liquid or solid that sheet material is carried out basic treatment, it is characterized in that to improve significantly the physical and chemical performance of urea-formaldehyde materials, improve intensity, water tolerance and the weathering resistance of sheet material; Employed basic material comprises: compounds such as yellow soda ash, sodium hydroxide, salt of wormwood, potassium hydroxide, calcium hydroxide, hydrated barta, magnesium hydroxide, ammoniacal liquor, ammonia, carbonic acid ammonia, bicarbonate of ammonia, urea, methylamine, ethamine, quadrol, diethylamine, triethylamine, diethanolamine, trolamine; Can use single above compound, also they can the be used stoste of both above mixtures or their aqueous solution; Its principal feature is that their pH value of aqueous solution are greater than 7; When the basic material that uses during, adopt in airtight container with this alkaline gas the sheet material stifling processing of pressurization that circulates as gas; When the basic material that uses during as liquid or its aqueous solution, employing is immersed the method for soaking in this basic solution to sheet material and is handled, again sheet material is carried out hot-pressing processing after perhaps soaking, also can be with the stifling sheet material of solid or liquid basified material vaporization back in encloses container; Use round-robin gas or liquid can obtain best effect during processing; In order to increase treatment effect, in fumigating gas or soak solution, add a certain amount of auxiliary agent simultaneously, as: permeate agent (tensio-active agent); The closed environment that employed encloses container and liquid treatment container can adopt all to use; Treatment time can be the random time section greater than 0 hour, is preferably 0.5～4.0 hour; Temperature ranges can be-50～250 ℃, is preferably-10～60 ℃; Processing pressure is 0～200 normal atmosphere, is preferably 1～5 normal atmosphere; After alkali pretreatment was finished, sheet material can use any possible method to carry out drying, and dried sheet material is finished product.
Technical target of the product, the water resistant sheet material (thick container bottom board is example with 28cm) that uses the art of this patent to produce, according to the concerned countries standard detection, the performance of glued board can reach:
(1) dry glue intensity: the water resistant sheet material (thick container bottom board is example with 28cm) that uses the art of this patent to produce, use 7.5 tons of heavy automobiles to roll no modification back and forth 9 times.
(2) water resistance: the water resistant sheet material (thick container bottom board is example with 28cm) that uses the art of this patent to produce, boiling water boiled 4 hours, after dry 20 hours, boiled 4 hours with boiling water in the baking oven of (63 ± 3) ℃ again, and residual strength is greater than 3.0MPa.
Or continuous poach after 72 hours in the boiling water, after dry 20 hours, residual strength is greater than 3.0MPa in the baking oven of (63 ± 3) ℃.
(3) burst size of methanal: meet the E1 standard.
Claims (8)
1, a kind of amino resin adhesive of preparing superstrong water-tight bamboo-wood is characterized in that its synthetic urea-formaldehyde resin under the strong acid system prepares, and makes the urea-formaldehyde resin molecule have a large amount of active branched chain structures.
2,, it is characterized in that it is made by following method according to the amino resin adhesive of the described preparing superstrong water-tight bamboo-wood of claim 1:
At first, be 20～100 ℃ in temperature, the pH value is under 1～7 the condition, with aldehydes starting material and aminocompound with (8～1): 1 mol ratio is carried out polyreaction, and the reaction times is controlled at 5～120min; Then, use sodium hydroxide, yellow soda ash, the aqueous solution of potassium hydroxide or salt of wormwood is transferred to 7～10 with the pH value of reaction medium; Adding is (0.1～2) with aldehydes starting material mol ratio: 1 aminocompound; Adding simultaneously is (0～1.0) with aldehydes starting material mol ratio: 1 phenolic material; Controlling reaction time when cloud point occurring, is regulated pH value=8.0～8.5, stopped reaction; Be cooled to below 40 ℃ discharging.
3,, it is characterized in that it is made by following method according to the amino resin adhesive of the described preparing superstrong water-tight bamboo-wood of claim 2:
At first, be 60～90 ℃ in temperature, the pH value is under 2～3 the condition, with aldehydes starting material and aminocompound with (5～2): 1 mol ratio is carried out polyreaction, and the reaction times is controlled at 10～40min; Then, use sodium hydroxide, yellow soda ash, the aqueous solution of potassium hydroxide or salt of wormwood is transferred to 7～8 with the pH value of reaction medium; Adding is (0.3～1) with aldehydes starting material mol ratio: 1 aminocompound; Adding simultaneously is (0.1～0.5) with aldehydes starting material mol ratio: 1 phenolic material; Controlling reaction time when cloud point occurring, is regulated pH value=8.0～8.5, stopped reaction; Be cooled to below 40 ℃ discharging.
4, according to the amino resin adhesive of the described preparing superstrong water-tight bamboo-wood of claim 3, it is characterized in that described aldehydes starting material can be one or more materials in formaldehyde, trioxymethylene and the Paraformaldehyde 96, also can use the urea-formaldehyde resin concentrated liquid; Described aminocompound is one or more materials in urea, thiocarbamide and the trimeric cyanamide; Described phenolic material is phenol, Resorcino, tannin or other polyphenol.
5,, it is characterized in that described aldehydes starting material are formaldehyde according to the amino resin adhesive of the described preparing superstrong water-tight bamboo-wood of claim 4; Described aminocompound is a urea; Described phenolic material is a phenol.
6, a kind ofly prepare the processing treatment technology of superpower water-fast bamboo wood board with claim 1 is described with amino resin adhesive, its complete processing is as follows:
Above-mentioned tackiness agent 100Kg is added in the Glue mixer, adds active filler 1～70Kg then, be stirred well to fully evenly, regulate 0.1＜pH＜7.0 of glue, add then that to account for the urea-formaldehyde resin mass percent be 0.01～20% linking agent,
Use common processing condition to carry out sheet material processing, use common glue applying method and resin added, employed hot pressing temperature is 80～230 ℃; Pressure is 0.5～3.0MPa; The single face resin added is 100～600g/m
2Hot pressing time 5～120 minutes;
Or use the aged processes sheet material of precompressed one heating, use above-mentioned gluing method and common glue applying method and the resin added of joining; At first implementing precompressed, is 0.5～3.0Mpa at pressure; Temperature is 0～230 ℃, is preferably room temperature; Squeeze time can be any time section, but is preferably 20～40min; Then, the sheet material behind the pre-molding can use temperature be 0～100 ℃, is preferably and places ageing under the room temperature condition, and digestion time can be preferably 48 hours for any time section;
Its aftertreatment technology:
Use alkaline gas, liquid or solid that sheet material is carried out basic treatment, can improve the physical and chemical performance of urea-formaldehyde materials significantly, improve intensity, water tolerance and the weathering resistance of sheet material, their pH value of aqueous solution are greater than 7; When the basic material that uses during, adopt in airtight container with this alkaline gas the sheet material stifling processing of pressurization that circulates as gas; When the basic material that uses during as liquid or its aqueous solution, employing is immersed the method for soaking in this basic solution to sheet material and is handled, again sheet material is carried out hot-pressing processing after perhaps soaking, also can be with the stifling sheet material of solid or liquid basified material vaporization back in encloses container; In order to increase treatment effect, add a certain amount of auxiliary agent in fumigating gas or soak solution simultaneously, after alkali pretreatment was finished, sheet material can use any possible method to carry out drying, and dried sheet material is finished product.
7, the processing treatment technology of the superpower water-fast bamboo wood board of preparation according to claim 10 is characterized in that described active filler is flour, wood powder, bean powder, tree bark powder and peanut hull meal; Described linking agent is 0.01～20% carbamate compounds, and its molecular formula is:
Wherein: R
1Be phenyl, tolyl, naphthyl, alkyl etc.;
R
2Be phenolic group, alcohol radical, imido grpup etc.
8, the processing treatment technology of the superpower water-fast bamboo wood board of preparation according to claim 10 is characterized in that described basic material is the stoste of yellow soda ash, sodium hydroxide, salt of wormwood, potassium hydroxide, calcium hydroxide, hydrated barta, magnesium hydroxide, ammoniacal liquor, ammonia, carbonic acid ammonia, bicarbonate of ammonia, urea, methylamine, ethamine, quadrol, diethylamine, triethylamine, diethanolamine, trolamine compound or their aqueous solution; Can use single above compound, the aqueous solution of both above mixtures that also can use them, its pH value of aqueous solution is greater than 7; Use round-robin gas or liquid can obtain best effect during processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100484077A CN100441651C (en) | 2006-07-07 | 2006-07-07 | Amino resin binding agent for preparing superstrong water-tight bamboo-wood sheet and sheet production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100484077A CN100441651C (en) | 2006-07-07 | 2006-07-07 | Amino resin binding agent for preparing superstrong water-tight bamboo-wood sheet and sheet production process |
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| Publication Number | Publication Date |
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| CN1884418A true CN1884418A (en) | 2006-12-27 |
| CN100441651C CN100441651C (en) | 2008-12-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108874A (en) * | 2015-07-15 | 2015-12-02 | 百仪家具有限公司 | Brucite-fiber-reinforced high-density fiberboard and preparation method thereof |
| CN111363506A (en) * | 2020-05-11 | 2020-07-03 | 上海邦畅贸易有限公司 | High-temperature-resistant metal adhesive |
| CN114231226A (en) * | 2021-12-27 | 2022-03-25 | 德华兔宝宝装饰新材股份有限公司 | Low-cost modified urea-formaldehyde resin adhesive |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103254840B (en) * | 2013-04-28 | 2016-01-20 | 南京林业大学 | A kind of Wood adhesive active filler and using method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001164228A (en) * | 1999-12-06 | 2001-06-19 | Sumitomo Bakelite Co Ltd | Adhesive composition for wood |
| CN1291632A (en) * | 2000-09-21 | 2001-04-18 | 何卫平 | Low-poison urea-formaldehyde resin adhesive and its preparing process |
| US7235613B2 (en) * | 2001-10-18 | 2007-06-26 | Akzo Nobel N.V. | Method of gluing wood based materials |
| MY135503A (en) * | 2001-10-18 | 2008-04-30 | Akzo Nobel Nv | Method of gluing wood based materials |
| DE102004062456A1 (en) * | 2004-12-20 | 2006-06-29 | Basf Ag | Binders for the production of materials |
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2006
- 2006-07-07 CN CNB2006100484077A patent/CN100441651C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108874A (en) * | 2015-07-15 | 2015-12-02 | 百仪家具有限公司 | Brucite-fiber-reinforced high-density fiberboard and preparation method thereof |
| CN111363506A (en) * | 2020-05-11 | 2020-07-03 | 上海邦畅贸易有限公司 | High-temperature-resistant metal adhesive |
| CN114231226A (en) * | 2021-12-27 | 2022-03-25 | 德华兔宝宝装饰新材股份有限公司 | Low-cost modified urea-formaldehyde resin adhesive |
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| CN100441651C (en) | 2008-12-10 |
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