CN105623569A - Wood based panel cross-linkable starch modified urea formaldehyde resin adhesive and preparation method thereof - Google Patents
Wood based panel cross-linkable starch modified urea formaldehyde resin adhesive and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a wood based panel cross-linkable starch modified urea formaldehyde resin adhesive and a preparation method thereof. The preparation method comprises: adding a formaldehyde aqueous solution to a reaction kettle, adjusting the pH value to 8.5-8.8with sodium hydroxide, adding first batch of urea, heating to a temperature of 70-90 DEG C, and carrying out thermal insulation for 30-45 min; adjusting the pH value to 4.7-5.1, and carrying out a reaction to achieve the T-4 viscosity cup viscosity measurement value of 17-18 s at a temperature of 30 DEG C; adjusting the pH value to 6.0-6.5, adding second batch of urea, controlling the temperature at 80-90 DEG C, and carrying out a reaction to achieve the T-4 viscosity cup viscosity measurement value of 18-19 s at a temperature of 30 DEG C; adjusting the pH value to 7.0-7.5, adding third batch of urea, controlling the temperature at 75-80 DEG C, carrying out thermal insulation for 10-40 min, and cooling; adding fourth batch of urea when the temperature is reduced to 70 DEG C, carrying out thermal insulation for 10 min, and cooling; adding a cross-linkable starch adhesive solution when the temperature is reduced to 50 DEG C, and continuously cooling; and adjusting the pH value to 7.5-8.0 when the temperature is reduced to less than or equal to 40 DEG C, and discharging the material so as to prepare the adhesive.
Description
Technical field
The present invention relates to a kind of adhesive, particularly relate to a kind of wood-based plate with cross-linking modified starch modified urea-formaldehyde resin adhesive, further relate to its preparation method, belong to adhesive of artificial board field.
Background technology
Urea-formaldehyde resin adhesive is widely used in the production of wood-based plate, and its consumption accounts for more than the 90% of wood-based plate glue consumption, is the kind that in adhesive of artificial board, consumption is maximum. Lauxite has the advantage that other resin is incomparable, and mainly its raw material is sufficient, cheap, is cheapest in synthetic resin. It addition, Lauxite also has lot of advantages, as glue-joint strength is high, solidifying rapidly, the glue-line after solidification is of light color, will not pollute the plate face being glued thing, good water solubility, easily modulate required appropriate viscosity and concentration. It is well known that, Lauxite also has some obvious shortcomings, except resistance to ag(e)ing is poor, hot water resistance is poor, cannot function as except outdoor wood-based plate glue, and its fatal defects is that the wood-based plate gluedd joint exists Form aldehyde release problem.
In order to reach the requirement of environmental protection, it is often necessary to the method for employing is the Lauxite of low mole prop0rtion. But along with the reduction of mol ratio, the mechanical properties decrease of plate. Main cause is the minimizing of low molar ratio urea-formaldehyde resin Free-formaldehyde, methylol group content etc., the reactivity of resin declines, frequently resulting in resin's crosslinkage low, under same hot pressing condition, Lauxite solidifies, cross-links insufficient, has ultimately resulted in the mechanical properties decrease of plate. Therefore, in order to can meet the requirement of environmental protection, do not affect again product mechanical property, only by improving the consumption of urea-formaldehyde resin adhesive, reducing speed of production, and add cyanurotriamide modified in glue process, considerably increasing production cost, reduce production efficiency, control of product quality difficulty strengthens. By Lauxite is modifiied, improve the curing cross-linked performance of low molar ratio urea-formaldehyde resin, thus reducing the consumption of urea-formaldehyde resin adhesive and improving speed of production, artificial board enterprise will be had very big economic benefit.
Starch is the organic compound of rich content in nature, have wide material sources, cheap, can be degradable and renewable etc. advantage. Starch uses as adhesive after gelatinizing or oxidation modification for a long time history. The natural polymers that starch is a kind of amylopectin and amylose component mixes naturally. The straight chain of starch and branched chain molecule make a big difference in molecular structure, state of aggregation and performance and application aspect tool. In recent years the molecular structure of starch and the research of physicochemical characteristic are made great progress, the intrinsic property utilizing the side chain of starch has carried out corresponding study on the modification, starch graft copolymer has the meaning of uniqueness in starch conversion technology, can with vinyl monomer graft copolymerization, introduce different functional groups, obtain the subject polymer of designing requirement.
" preparation of starch and urea resin composite adhesive and performance study " article that Tan Haiyan in 2012 delivers is mentioned with polyvinyl alcohol, Borax, corn starch, sodium hypochlorite, sodium sulfite and nano kaoline for primary raw material, then composite with Lauxite, make UF/ starch complex adhesive, can be used for the splicing of plywood. But, owing to its main chain containing too many hydrophilic hydroxy group, and fail after its molding to form effective cross-linked network, Gu its resistance to water, storage stability are not good enough, and glue-joint strength is relatively low.
Chinese patent CN102875742 discloses the manufacture method of the highly-branched degree acrylamide grafted copolymer that a kind of amylopectin is skeleton, and the method includes: carried out free radical grafting reaction by amylopectin, water-soluble vinyl monomer such as acrylamide, optional carbamide and optional response type surfactant active; Then adding cross-linking monomer and the cross-linking agent that can react with cross-linking monomer is modified reaction and obtains wet slurry, then optionally drying this slurry, thus preparing highly-branched degree, lightly crosslinked water miscible graft polymers (or copolymer).
The preparation method that Chinese patent CN102617799 discloses a kind of starch graft acrylamide paper strengthening agent, the method comprises the following steps: add oxidant, sodium hydroxide in starch emulsion, oxidation reaction is carried out at 30-80 DEG C, add cationic reagent, at 30-90 DEG C, carry out positive ionization; After again gained starch gelatinization being cooled down, with acrylamide, cationic monomer for mixed grafting monomer, add initiator, the aqueous phase of 40-80 DEG C carries out graft copolymerization, the starch graft copolymer of system.
Chinese patent CN102464772A discloses the novel processing step of a kind of starch-acrylamide grafted copolymer, and the method includes: weigh starch and distilled water in reaction vessel; Stirring makes starch gelatinization, adds acrylamide monomer and reacts, obtains product.
Summary of the invention
The technical problem to be solved in the present invention is that the shortcoming for prior art provides a kind of wood-based plate cross-linking starch conversion urea-formaldehyde resin adhesive and preparation method thereof.
For reaching above-mentioned purpose, one wood-based plate of the present invention is with cross-linking starch conversion urea-formaldehyde resin adhesive, raw material including following weight portion is prepared from: formalin 450-540 part, carbamide 320-380 part, cross-linking starch 100-200 part, wherein in formalin, concentration of formaldehyde is 37%.
Wherein said cross-linking starch, raw material including following composition by weight is prepared from: starch 6-15 part, thiazolinyl anhydride 1-6 part, acrylamide aqueous solution 10-25 part, ammonium persulfate aqueous solution 2-5 part, aqueous solution of sodium bisulfite 2-5 part, water 40-70 part, formaldehyde 3-6 part.
The mixture of the wherein said starch one or more arbitrary proportions in corn starch, tapioca, potato starch, cationic starch, Oxytarch, carboxymethyl starch, it is preferred to corn starch.
The mixture of the wherein said thiazolinyl anhydride one or more arbitrary proportions in maleic anhydride, octenyl succinic acid anhydride, dodecenylsuccinic acid acid anhydride, it is preferred to maleic anhydride.
Wherein said persulfuric acid acid aqueous ammonium concentration is 1-3%, and the concentration of acrylamide aqueous solution is 20-40%, and the concentration of aqueous solution of sodium bisulfite is 1-3%.
Wherein said cross-linking starch preparation method comprises the steps:
1) add water and starch, in a kettle., then regulate pH=2-6 by pH adjusting agent, be warming up to 70-80 DEG C, insulation reaction 60-90 minute;
2), then it is cooled to 30-35 DEG C, regulates pH=8.5-9.0 by pH adjusting agent, add thiazolinyl anhydride, surveyed pH every 20 minutes and keep pH=8.5-9.0, under 35 DEG C of conditions, react 2h;
3), regulate pH=6.5-7.0 by pH adjusting agent, be warming up to 90 DEG C, drip ammonium persulfate aqueous solution and acrylamide aqueous solution, drip in 2h, react 30 minutes under 90 DEG C of conditions after being added dropwise to complete;
4), add aqueous solution of sodium bisulfite, be cooled to 40 DEG C;
5), by pH adjusting agent regulating pH=8.5-9.0, add formaldehyde, react 1-2h, then discharging prepares described cross-linking starch.
A kind of prepare the described wood-based plate method with cross-linking starch conversion urea-formaldehyde resin adhesive, comprise the following steps:
1) add formalin in a kettle., adjust pH=8.5-8.8 with sodium hydroxide, be subsequently adding first carbamide, be warming up to 70-90 DEG C, be incubated 30-45 minute;
2) adjust pH to 4.7-5.1, react to viscosity: be coated with-4 glasss of 17-18s at the measured values of 30 DEG C;
3) adjusting pH to 6.0-6.5, add second batch carbamide, temperature controls at 80-90 DEG C, reacts to viscosity: be coated with-4 glasss of 18-19s at the measured values of 30 DEG C;
4) adjusting pH to 7.0-7.5, add the 3rd batch of carbamide, temperature controls 75-80 DEG C, is incubated 10-40 minute, cooling;
5) add the 4th batch of carbamide when being cooled to 70 DEG C, be incubated 10 minutes, cooling;
6) add cross-linking starch solution when being cooled to 50 DEG C, continue cooling;
7) it is cooled to less than 40 DEG C, adjusts pH=7.5-8.0, discharging.
8, the preparation method of cross-linking starch conversion urea-formaldehyde resin adhesive of the wood-based plate according to claim 7, it is characterised in that: 45-55%, 8-12%, 12-18%, 19-28% of the addition of first to fourth time described carbamide respectively carbamide gross weight.
One or both in sulphuric acid, hydrochloric acid, phosphoric acid, acetic acid, nitric acid, sodium carbonate, sodium bicarbonate, sodium hydroxide and potassium hydroxide of wherein said pH adjusting agent think the mixture of arbitrary proportion.
The invention difference from existing technology is in that the present invention achieves following technique effect:
The present invention, by starch is carried out graft modification, introduces amide group on starch polymer chain, then carries out condensation with formaldehyde, form methylol groups. Join in Lauxite, in hot pressing, crosslinked action by means of methylol, there is cross-linking reaction with the micromolecular compound in Lauxite and the amino of Lauxite macromole, methylol etc., formed with Lauxite strand be skeleton, starch chain be supplementary cross-linked network. Drastically increase the solidification of Lauxite, cross-linking effect; Starch is as macromolecular compound simultaneously, reduces Lauxite infiltration in wood, decreases Lauxite loss in dry run, thus reaching to be effectively improved the purpose of urea-formaldehyde resin adhesive service efficiency and bonding property.
Detailed description of the invention
Below in conjunction with embodiment, to the present invention, above-mentioned and other technical characteristic and advantage are described in more detail.
Embodiment 1
The preparation method that this example provides a kind of cross-linking starch, primary raw material used and inventory are referring to following table:
| Raw material | Inventory |
| Corn starch | 10kg |
| Water | 62.5kg |
| Maleic anhydride | 2kg |
| Acrylamide aqueous solution | 15kg |
| Ammonium persulfate aqueous solution | 3.5kg |
| Aqueous solution of sodium bisulfite | 4kg |
| Formaldehyde | 3kg |
Described method is embodied as follows:
1) add water and corn starch, in a kettle., then regulate pH=2 with sulphuric acid, be warming up to 80 DEG C, insulation reaction 80 minutes;
2), then it is cooled to 30-35 DEG C, regulates pH=8.5-9.0 with sodium hydroxide, add maleic anhydride, surveyed pH every 20 minutes and keep pH=8.5-9.0, under 35 DEG C of conditions, react 2h;
3), regulate pH=6.5-7.0 with acetic acid, be warming up to 90 DEG C, drip ammonium persulfate aqueous solution and acrylamide aqueous solution, drip in 2h, react 30 minutes under 90 DEG C of conditions after being added dropwise to complete;
4), add aqueous solution of sodium bisulfite, be cooled to 40 DEG C;
5), by pH adjusting agent regulate pH=8.5-9.0, add formaldehyde, react 1.5h, then discharging.
Obtain solid content be 15.4%, viscosity is 650mPa.s, pH be 7.5 cross-linking starch 1.
The preparation method that this example provides a kind of cross-linking starch conversion Lauxite, primary raw material used and consumption are referring to following table:
Described specific implementation method is as follows:
1) add formaldehyde in a kettle., adjust pH=8.5-8.8 with sodium hydroxide, be subsequently adding first carbamide, be warming up to 70-90 DEG C, be incubated 30-45 minute;
2) adjust pH to 4.7-5.1, react to viscosity: be coated with-4 glasss of 17-18s (30 DEG C);
3) adjusting pH to 6.0-6.5, add second batch carbamide, temperature controls at 80-90 DEG C, reacts to viscosity: be coated with-4 glasss of 18-19s (30 DEG C);
5) adjusting pH to 7.0-7.5, add the 3rd batch of carbamide, temperature controls 75-80 DEG C, is incubated 10-40 minute, cooling;
6) add the 4th batch of carbamide when being cooled to 70 DEG C, be incubated 10 minutes, cooling;
7) add cross-linking starch 1 when being cooled to 50 DEG C, continue cooling;
8) it is cooled to less than 40 DEG C, adjusts pH=7.5-8.0, discharging.
Obtaining solid content is 46.5%, and viscosity is 15.6s (25 DEG C), and hardening time, 123s, pH were the cross-linking starch conversion Lauxite 1 of 7.5.
Embodiment 2
The preparation method that this example provides a kind of cross-linking starch, primary raw material used and inventory are referring to following table:
| Raw material | Inventory |
| Tapioca | 8kg |
| Water | 57.5kg |
| Octyl group succinic anhydrides | 1.5kg |
| Acrylamide aqueous solution | 20kg |
| Ammonium persulfate aqueous solution | 4kg |
| Aqueous solution of sodium bisulfite | 4.5kg |
| Formaldehyde | 4.5kg |
Described method is embodied as follows:
1) add water and tapioca, in a kettle., then regulate pH=3 with hydrochloric acid, be warming up to 80 DEG C, insulation reaction 75 minutes;
2), then it is cooled to 30-35 DEG C, regulates pH=8.5-9.0 with sodium hydroxide, add octyl group succinic anhydrides, surveyed pH every 20 minutes and keep pH=8.5-9.0, under 35 DEG C of conditions, react 2h;
3), regulate pH=6.5-7.0 with acetic acid, be warming up to 90 DEG C, drip ammonium persulfate aqueous solution and acrylamide aqueous solution, drip in 2h, react 30 minutes under 90 DEG C of conditions after being added dropwise to complete;
4), add aqueous solution of sodium bisulfite, be cooled to 40 DEG C;
5), by pH adjusting agent regulate pH=8.5-9.0, add formaldehyde, react 1.5h, then discharging.
Obtain solid content be 14.6%, viscosity is 580mPa.s, pH be 7.3 cross-linking starch 2.
The preparation method that this example provides a kind of cross-linking starch conversion Lauxite, primary raw material used and consumption are referring to following table:
Described specific implementation method is as follows:
1) add formaldehyde in a kettle., adjust pH=8.5-8.8 with sodium hydroxide, be subsequently adding first carbamide, be warming up to 70-90 DEG C, be incubated 30-45 minute;
2) adjust pH to 4.7-5.1, react to viscosity: be coated with-4 glasss of 17-18s (30 DEG C);
3) adjusting pH to 6.0-6.5, add second batch carbamide, temperature controls at 80-90 DEG C, reacts to viscosity: be coated with-4 glasss of 18-19s (30 DEG C);
5) adjusting pH to 7.0-7.5, add the 3rd batch of carbamide, temperature controls 75-80 DEG C, is incubated 10-40 minute, cooling;
6) add the 4th batch of carbamide when being cooled to 70 DEG C, be incubated 10 minutes, cooling;
7) add cross-linking starch 2 when being cooled to 50 DEG C, continue cooling;
8) it is cooled to less than 40 DEG C, adjusts pH=7.5-8.0, discharging.
Obtaining solid content is 47.4%, and viscosity is 16.5s (25 DEG C), and hardening time, 115s, pH were the cross-linking starch conversion Lauxite 2 of 7.8.
Embodiment 3
The preparation method that this example provides a kind of cross-linking starch, primary raw material used and inventory are referring to following table:
| Raw material | Inventory |
| Carboxymethyl starch | 6kg |
| Water | 67kg |
| Maleic anhydride | 2.5kg |
| Acrylamide aqueous solution | 15kg |
| Ammonium persulfate aqueous solution | 3kg |
| Aqueous solution of sodium bisulfite | 3.5kg |
| Formaldehyde | 3kg |
Described method is embodied as follows:
1) add water and carboxymethyl starch, in a kettle., then regulate pH=2.5 with sulphuric acid, be warming up to 80 DEG C, insulation reaction 60 minutes;
2), then it is cooled to 30-35 DEG C, regulates pH=8.5-9.0 with sodium hydroxide, add octyl group succinic anhydrides, surveyed pH every 20 minutes and keep pH=8.5-9.0, under 35 DEG C of conditions, react 2h;
3), regulate pH=6.5-7.0 with acetic acid, be warming up to 90 DEG C, drip ammonium persulfate aqueous solution and acrylamide aqueous solution, drip in 2h, react 30 minutes under 90 DEG C of conditions after being added dropwise to complete;
4), add aqueous solution of sodium bisulfite, be cooled to 40 DEG C;
5), by pH adjusting agent regulate pH=8.5-9.0, add formaldehyde, react 1h, then discharging.
Obtain solid content be 12.4%, viscosity is 450mPa.s, pH be 7.8 cross-linking starch 3.
The preparation method that this example provides a kind of cross-linking starch conversion Lauxite, primary raw material used and consumption are referring to following table:
Described specific implementation method is as follows:
1) add formaldehyde in a kettle., adjust pH=8.5-8.8 with sodium hydroxide, be subsequently adding first carbamide, be warming up to 70-90 DEG C, be incubated 30-45 minute;
2) adjust pH to 4.7-5.1, react to viscosity: be coated with-4 glasss of 17-18s (30 DEG C);
3) adjusting pH to 6.0-6.5, add second batch carbamide, temperature controls at 80-90 DEG C, reacts to viscosity: be coated with-4 glasss of 18-19s (30 DEG C);
5) adjusting pH to 7.0-7.5, add the 3rd batch of carbamide, temperature controls 75-80 DEG C, is incubated 10-40 minute, cooling;
6) add the 4th batch of carbamide when being cooled to 70 DEG C, be incubated 10 minutes, cooling;
7) add cross-linking starch 3 when being cooled to 50 DEG C, continue cooling;
8) it is cooled to less than 40 DEG C, adjusts pH=7.5-8.0, discharging.
Obtaining solid content is 48.2%, and viscosity is 17.2s (25 DEG C), and hardening time, 106s, pH were the cross-linking starch conversion Lauxite 3 of 7.6.
Embodiment 4
The preparation method that this example provides a kind of cross-linking starch, primary raw material used and inventory are referring to following table:
| Raw material | Inventory |
| Corn starch | 9kg |
| Water | 65.5kg |
| Maleic anhydride | 2.5kg |
| Acrylamide aqueous solution | 12.5kg |
| Ammonium persulfate aqueous solution | 3.5kg |
| Aqueous solution of sodium bisulfite | 4kg |
| Formaldehyde | 3kg |
Described method is embodied as follows:
1) add water and carboxymethyl starch, in a kettle., then regulate pH=2.5 with sulphuric acid, be warming up to 80 DEG C, insulation reaction 60 minutes;
2), then it is cooled to 30-35 DEG C, regulates pH=8.5-9.0 with sodium hydroxide, add octyl group succinic anhydrides, surveyed pH every 20 minutes and keep pH=8.5-9.0, under 35 DEG C of conditions, react 2h;
3), regulate pH=6.5-7.0 with acetic acid, be warming up to 90 DEG C, drip ammonium persulfate aqueous solution and acrylamide aqueous solution, drip in 2h, react 30 minutes under 90 DEG C of conditions after being added dropwise to complete;
4), add aqueous solution of sodium bisulfite, be cooled to 40 DEG C;
5), by pH adjusting agent regulate pH=8.5-9.0, add formaldehyde, react 1h, then discharging.
Obtain solid content be 16.3%, viscosity is 680mPa.s, pH be 7.2 cross-linking starch 4.
The preparation method that this example provides a kind of cross-linking starch conversion Lauxite, primary raw material used and consumption are referring to following table:
Described specific implementation method is as follows:
1) add formaldehyde in a kettle., adjust pH=8.5-8.8 with sodium hydroxide, be subsequently adding first carbamide, be warming up to 70-90 DEG C, be incubated 30-45 minute;
2) adjust pH to 4.7-5.1, react to viscosity: be coated with-4 glasss of 17-18s (30 DEG C);
3) adjusting pH to 6.0-6.5, add second batch carbamide, temperature controls at 80-90 DEG C, reacts to viscosity: be coated with-4 glasss of 18-19s (30 DEG C);
5) adjusting pH to 7.0-7.5, add the 3rd batch of carbamide, temperature controls 75-80 DEG C, is incubated 10-40 minute, cooling;
6) add the 4th batch of carbamide when being cooled to 70 DEG C, be incubated 10 minutes, cooling;
7) add cross-linking starch 4 when being cooled to 50 DEG C, continue cooling;
8) it is cooled to less than 40 DEG C, adjusts pH=7.5-8.0, discharging.
Obtaining solid content is 49.8%, and viscosity is 17.8s (25 DEG C), and hardening time, 97s, pH were the cross-linking starch conversion Lauxite 4 of 7.5.
Reference examples 1
The preparation method that reference examples provides the cyanurotriamide modified urea resin of a kind of environmental protection, primary raw material used and inventory are referring to following table:
Described specific implementation method is as follows:
1) add formaldehyde in a kettle., adjust pH=8.5-8.8 with sodium hydroxide, be subsequently adding first carbamide and tripolycyanamide, be warming up to 70-90 DEG C, be incubated 30-45 minute;
2) adjust pH to 4.7-5.1, react to viscosity: be coated with-4 glasss of 17-18s (30 DEG C);
3) adjusting pH to 6.0-6.5, add second batch carbamide, temperature controls at 80-90 DEG C, reacts to viscosity: be coated with-4 glasss of 18-19s (30 DEG C);
5) adjusting pH to 7.0-7.5, add the 3rd batch of carbamide, temperature controls 75-80 DEG C, is incubated 10-40 minute, cooling;
6) add the 4th batch of carbamide when being cooled to 70 DEG C, be incubated 10 minutes, cooling;
7) add cross-linking starch solution when being cooled to 50 DEG C, continue cooling;
8) it is cooled to less than 40 DEG C, adjusts pH=7.5-8.0, discharging.
Obtaining solid content is 52.4%, and viscosity is 18.8s (25 DEG C), and hardening time, 86s, pH were the cyanurotriamide modified urea resin of 7.5.
Experimental example
By the cross-linking starch conversion Lauxite of embodiment of the present invention 1-4 and reference examples cyanurotriamide modified urea resin, it is applied to close DEG C of fibre board in compacting 16mm. Hot pressing parameters is table 1 below such as:
| Numbering | The hot pressing factor | Resin added | Hardener dose |
| Reference examples 1 | 9.13 | 180kg/m3 | 1% |
| Embodiment 1 | 7.9 | 173kg/m3 | 1% |
| Embodiment 2 | 8.2 | 172kg/m3 | 1% |
| Embodiment 3 | 7.6 | 170kg/m3 | 1% |
| Embodiment 4 | 8.4 | 176kg/m3 | 1% |
According to the fibre board that above-mentioned technique is suppressed, and by GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique ", product being detected, burst size of methanal adopts Extraction method detection. Testing result is as shown in table 2 below:
Be can be seen that by table 1 and table 2, cross-linking starch conversion Lauxite is compared with melamine modified urea-formaldehyde tree, under reaching the premise of same environmental protection and mechanical property, the hot pressing factor shortens 7-16%, throughput rate is improved, and resin added decreases 3-5%, illustrate that cross-linking starch can greatly improve the curing cross-linked effect of low molar ratio urea-formaldehyde resin, improve the service efficiency of Lauxite, cost accounting result shows, using cross-linking starch conversion resin relatively cyanurotriamide modified urea resin, name cubic meter can save 36-50 unit.
Embodiment described above is only that the preferred embodiment of the present invention is described; not the scope of the present invention is defined; under the premise designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention is determined.
Claims (10)
1. a wood-based plate is with cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterized in that it raw material including following weight portion is prepared from: formalin 450-540 part, carbamide 320-380 part, cross-linking starch 100-200 part, wherein in formalin, concentration of formaldehyde is 37%.
2. wood-based plate according to claim 1 is with cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterized in that: described cross-linking starch, raw material including following composition by weight is prepared from: starch 6-15 part, thiazolinyl anhydride 1-6 part, acrylamide aqueous solution 10-25 part, ammonium persulfate aqueous solution 2-5 part, aqueous solution of sodium bisulfite 2-5 part, water 40-70 part, formaldehyde 3-6 part.
3. wood-based plate according to claim 2 is with cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterized in that: the mixture of the described starch one or more arbitrary proportions in corn starch, tapioca, potato starch, cationic starch, Oxytarch, carboxymethyl starch, it is preferred to corn starch.
4. wood-based plate according to claim 2 is with cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterized in that: the mixture of the described thiazolinyl anhydride one or more arbitrary proportions in maleic anhydride, octenyl succinic acid anhydride, dodecenylsuccinic acid acid anhydride, it is preferred to maleic anhydride.
5. wood-based plate according to claim 2 is with cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterized in that: it is characterized in that described persulfuric acid acid aqueous ammonium concentration is 1-3%, the concentration of acrylamide aqueous solution is 20-40%, and the concentration of aqueous solution of sodium bisulfite is 1-3%.
6. the wood-based plate according to any one of claim 2-5 is with cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterised in that described cross-linking starch preparation method comprises the steps:
1) add water and starch, in a kettle., then regulate pH=2-6 by pH adjusting agent, be warming up to 70-80 DEG C, insulation reaction 60-90 minute;
2), then it is cooled to 30-35 DEG C, regulates pH=8.5-9.0 by pH adjusting agent, add thiazolinyl anhydride, surveyed pH every 20 minutes and keep pH=8.5-9.0, under 35 DEG C of conditions, react 2h;
3), regulate pH=6.5-7.0 by pH adjusting agent, be warming up to 90 DEG C, drip ammonium persulfate aqueous solution and acrylamide aqueous solution, drip in 2h, react 30 minutes under 90 DEG C of conditions after being added dropwise to complete;
4), add aqueous solution of sodium bisulfite, be cooled to 40 DEG C;
5), by pH adjusting agent regulating pH=8.5-9.0, add formaldehyde, react 1-2h, then discharging prepares described cross-linking starch.
7. prepare the wood-based plate method of cross-linking starch conversion urea-formaldehyde resin adhesive as according to any one of claim 1-6 for one kind, it is characterised in that comprise the following steps:
1) add formalin in a kettle., adjust pH=8.5-8.8 with sodium hydroxide, be subsequently adding first carbamide, be warming up to 70-90 DEG C, be incubated 30-45 minute;
2) adjust pH to 4.7-5.1, react to viscosity: be coated with-4 glasss of 17-18s at the measured values of 30 DEG C;
3) adjusting pH to 6.0-6.5, add second batch carbamide, temperature controls at 80-90 DEG C, reacts to viscosity: be coated with-4 glasss of 18-19s at the measured values of 30 DEG C;
4) adjusting pH to 7.0-7.5, add the 3rd batch of carbamide, temperature controls 75-80 DEG C, is incubated 10-40 minute, cooling;
5) add the 4th batch of carbamide when being cooled to 70 DEG C, be incubated 10 minutes, cooling;
6) add cross-linking starch solution when being cooled to 50 DEG C, continue cooling;
7) it is cooled to less than 40 DEG C, adjusts pH=7.5-8.0, discharging.
8. the preparation method of cross-linking starch conversion urea-formaldehyde resin adhesive of the wood-based plate according to claim 7, it is characterised in that: 45-55%, 8-12%, 12-18%, 19-28% of the addition of first to fourth time described carbamide respectively carbamide gross weight.
9. the wood-based plate according to claim 6 preparation method of cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterised in that one or both in sulphuric acid, hydrochloric acid, phosphoric acid, acetic acid, nitric acid, sodium carbonate, sodium bicarbonate, sodium hydroxide and potassium hydroxide of described pH adjusting agent think the mixture of arbitrary proportion.
10. the wood-based plate according to claim 7 preparation method of cross-linking starch conversion urea-formaldehyde resin adhesive, it is characterised in that one or both in sulphuric acid, hydrochloric acid, phosphoric acid, acetic acid, nitric acid, sodium carbonate, sodium bicarbonate, sodium hydroxide and potassium hydroxide of described pH adjusting agent think the mixture of arbitrary proportion.
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| CN201410643312.4A CN105623569B (en) | 2014-11-07 | 2014-11-07 | A kind of wood-based plate cross-linking starch conversion urea-formaldehyde resin adhesive and preparation method thereof |
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| CN201410643312.4A CN105623569B (en) | 2014-11-07 | 2014-11-07 | A kind of wood-based plate cross-linking starch conversion urea-formaldehyde resin adhesive and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110540619A (en) * | 2019-03-27 | 2019-12-06 | 福建工程学院 | modified urea-formaldehyde resin and preparation method thereof |
| CN117757384A (en) * | 2024-01-05 | 2024-03-26 | 临沂江源装饰材料有限公司 | Aldehyde-free impregnated paper adhesive and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102086295A (en) * | 2010-06-28 | 2011-06-08 | 永港伟方（北京）科技股份有限公司 | Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof |
| CN103031095A (en) * | 2012-12-12 | 2013-04-10 | 永港伟方（北京）科技股份有限公司 | Adhesive for veneering of artificial board and preparation method of adhesive |
| CN103540293A (en) * | 2013-10-18 | 2014-01-29 | 王夕刚 | Dust suppressant, and use and preparation method thereof, as well as method for suppressing dust during transportation of ironstone |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102086295A (en) * | 2010-06-28 | 2011-06-08 | 永港伟方（北京）科技股份有限公司 | Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof |
| CN103031095A (en) * | 2012-12-12 | 2013-04-10 | 永港伟方（北京）科技股份有限公司 | Adhesive for veneering of artificial board and preparation method of adhesive |
| CN103540293A (en) * | 2013-10-18 | 2014-01-29 | 王夕刚 | Dust suppressant, and use and preparation method thereof, as well as method for suppressing dust during transportation of ironstone |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110540619A (en) * | 2019-03-27 | 2019-12-06 | 福建工程学院 | modified urea-formaldehyde resin and preparation method thereof |
| CN117757384A (en) * | 2024-01-05 | 2024-03-26 | 临沂江源装饰材料有限公司 | Aldehyde-free impregnated paper adhesive and preparation method thereof |
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