CN100503764C - High performance environment friendly urea-formaldehyde resin adhesive and its preparing method and use - Google Patents
High performance environment friendly urea-formaldehyde resin adhesive and its preparing method and use Download PDFInfo
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- CN100503764C CN100503764C CNB2006100172713A CN200610017271A CN100503764C CN 100503764 C CN100503764 C CN 100503764C CN B2006100172713 A CNB2006100172713 A CN B2006100172713A CN 200610017271 A CN200610017271 A CN 200610017271A CN 100503764 C CN100503764 C CN 100503764C
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Abstract
The adhesive of the present invention features the urea and formaldehyde in relatively low molar ratio of 0.8-1.03 and synthesized into urea-formaldehyde resin in an alkali-acid-alkali process, solid content of 48-55 %, viscosity of 80-120 mPa.s, pH 7.2-7.8, free formaldehyde content not higher than 0.1 %, and the composite curing agent of inorganic salt, inorganic acid and organic acid. It has the advantages of unique design, simple preparation process, no environmental pollution, low cost, etc. It may be used for various kinds of timber products.
Description
Technical field
The present invention relates to the improvement of urea-formaldehyde resin adhesive and preparation method thereof, is a kind of high performance environment friendly urea-formaldehyde resin adhesive and its production and use specifically, belongs to technical field of adhesive in the chemistry.
Background technology
Urea-formaldehyde resin adhesive is the tackiness agent of usage quantity maximum in the timber industry, accounts for more than 80% of the sector tackiness agent usage quantity.China released mandatory GB18580-2001 national standard on July 1st, 2002, and the release of objectionable impurities forces the production pattern of urea-formaldehyde resin to change in the strict confinement cells, and environment friendly urea-formaldehyde resin adhesive increases rapidly.The at present domestic existing technology that can reach production E1 level environment friendly urea-formaldehyde resin adhesive, still, production stability is poor; Burst size of methanal is in criticality, has to address this problem by formaldehyde-trapping agent; Use properties remains in serious problems, be in the criticality of GB9846-2004 standard-required as precompressed poor (room temperature reaches 2-4 hour), bonding strength, directly cause production efficiency reduction, quality product risk to increase, limited the widespread use of existing E1 grade urea-formaldehyde resin tackiness agent in the wood gluing goods.
Summary of the invention
The objective of the invention is at above-mentioned deficiency, provide a kind of and can reach the environmental requirement of GB18580-2001 national standard E1 level, stability is strong in the production use, compare the high performance environment friendly urea-formaldehyde resin adhesive that precompressed is good, bonding strength is high with existing E1 grade urea-formaldehyde resin tackiness agent.
The technical scheme that realizes the object of the invention is:
This high performance environment friendly urea-formaldehyde resin adhesive belongs to hot setting adhesive, is made up of urea-formaldehyde resin and solidifying agent two portions thereof, and urea-formaldehyde resin and solidifying agent are respectively by following proportion raw material:
(1) urea-formaldehyde resin:
Total mole of 0.8-1.03 of formaldehyde and urea;
The trimeric cyanamide consumption is the 1.5-5% of formaldehyde weight consumption;
The boric acid consumption is the 0.3-0.8% of formaldehyde weight consumption;
The oxalic dialdehyde consumption is the 0.6-0.82% of formaldehyde weight consumption;
The W-Gum consumption is the 2.5-5% of formaldehyde weight consumption:
With formic acid and sodium hydroxide adjust pH,
(2) special curing agent:
Ammonium chloride 150～200 weight parts;
Iron trichloride 80～150 weight parts;
Water 500～800 weight parts,
And adopt following preparation method to make:
(1) preparation of urea-formaldehyde resin:
With the disposable adding reactor of formaldehyde, heat temperature raising back end hydrogenation sodium oxide adjust pH 8.1-8.3, in the time of temperature of reaction 30-40 ℃, the 1st adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.8-2.2;
Temperature of reaction stops heating when reaching 50-56 ℃, when temperature of reaction rises to 80-88 ℃ naturally, and insulation reaction 30 minutes, when treating that the pH value drops to 6.7-6.0, add boric acid and with formic acid adjust pH 5.8-5.0, insulation reaction during temperature of reaction to 92 ℃-94 ℃ makes the pH value be not less than 4.2;
Adding boric acid viscosimetric after half an hour, be issued to 14-14.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 6.6-5.8, the trimeric cyanamide that adds trimeric cyanamide consumption 50%, kept 10 minutes, and then after adding formic acid adjust pH 5.2-6.0, the 2nd adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.35-1.47, insulation reaction during 92 ℃-93 ℃ of temperature of reaction;
Be issued to 19.5-20.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 8.0-8.3, the trimeric cyanamide that adds residue 50%, kept 20 minutes, add urea the 3rd time, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.0-1.1, insulation reaction is 30 minutes when being cooled to 80 ℃, be issued to 22-24 during second when being coated with-4 viscosity 30 ℃ of conditions, the 4th adds urea, and add-on is that the mol ratio of formaldehyde and urea is the urea of 0.8-1.03, add oxalic dialdehyde and W-Gum when being cooled to 50 ℃, after keeping 1 hour adjust pH 7.2-7.8, be cooled to 40 ℃ and promptly get urea-formaldehyde resin
(2) preparation of solidifying agent:
After ammonium chloride, the iron trichloride of described weight part be ground to the above fine powder of 500 orders, under 40-60 ℃ of condition, slowly disperse equably to add in the entry, promptly get solidifying agent.
Another object of the present invention provides the preparation method of this high performance environment friendly urea-formaldehyde resin adhesive.
The preparation method who above-mentioned raw materials is made tackiness agent of the present invention is as follows:
(1) preparation of urea-formaldehyde resin:
With the disposable adding reactor of formaldehyde, heat temperature raising back end hydrogenation sodium oxide adjust pH 8.1-8.3, in the time of temperature of reaction 30-40 ℃, the 1st adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.8-2.2;
Temperature of reaction stops heating when reaching 50-56 ℃, when temperature of reaction rises to 80-88 ℃ naturally, and insulation reaction 30 minutes, when treating that the pH value drops to 6.7-6.0, add boric acid and with formic acid adjust pH 5.8-5.0, insulation reaction during temperature of reaction to 92 ℃-94 ℃ makes the pH value be not less than 4.2;
Adding boric acid viscosimetric after half an hour, be issued to 14-14.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 6.6-5.8, the trimeric cyanamide that adds trimeric cyanamide consumption 50%, kept 10 minutes, and then after adding formic acid adjust pH 5.2-6.0, the 2nd adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.35-1.47, insulation reaction during 92 ℃-93 ℃ of temperature of reaction;
Be issued to 19.5-20.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 8.0-8.3, the trimeric cyanamide that adds residue 50%, kept 20 minutes, add urea the 3rd time, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.0-1.1, insulation reaction is 30 minutes when being cooled to 80 ℃, be issued to 22-24 during second when being coated with-4 viscosity 30 ℃ of conditions, the 4th adds urea, and add-on is that the mol ratio of formaldehyde and urea is the urea of 0.8-1.03, add oxalic dialdehyde and W-Gum when being cooled to 50 ℃, after keeping 1 hour adjust pH 7.2-7.8, be cooled to 40 ℃ and promptly get urea-formaldehyde resin
(2) preparation of solidifying agent:
After ammonium chloride, the iron trichloride of described weight part be ground to the above fine powder of 500 orders, under 40-60 ℃ of condition, slowly disperse equably to add in the entry, promptly get solidifying agent.
Another purpose of the present invention also provides the purposes of this high performance environment friendly urea-formaldehyde resin adhesive.
High performance environment friendly urea-formaldehyde resin adhesive of the present invention is used for multiplying plywood, three-layer real-wood, bamboo, bamboo compound floor, multi-layer solid wood composite floor, core-board, laminated products such as bentwood furniture.
Its using method is:
(1) impregnation proportioning: urea-formaldehyde resin: plyability filler: solidifying agent=100: 10-20: 5-8,
Described plyability filler is mixed by the lignin of 400 order lime carbonate of the industrial flour of 70 weight parts, 10 weight parts and 20 weight parts and makes;
(2) modulation of tackiness agent: slowly add the plyability filler in the urea-formaldehyde resin earlier, stir after 10 minutes, (consumption of solidifying agent is according to seasonal adjustment to add solidifying agent again, autumn and winter season can be added, spring and summer adds season less), stir after 20 minutes, promptly get the tackiness agent of the present invention of active 4 hours phases at room temperature;
(3) heat pressing process: double spread amount 280-320g/m
2Squeeze time 40min; Hot pressing time 1min/mm thickness of slab; Unit pressure 0.7-1.1MPa; Hot pressing temperature: 105-115 ℃.
High performance environment friendly urea-formaldehyde resin adhesive of the present invention also is used for laminated products such as ordinary particle board and shaving board.
Its using method is:
(1) impregnation proportioning: urea-formaldehyde resin: papermaking wastewater: solidifying agent=100: 2-4: 3-5,
Described papermaking wastewater is the sulphite papermaking wastewater in paper mill;
(2) modulation of tackiness agent: earlier urea-formaldehyde resin and papermaking wastewater are mixed, and then add solidifying agent, after stirring, promptly get the tackiness agent of the present invention of active 2 hours phases at room temperature;
(3) mask-making technology: glue consumption 120kg/m
3, wherein: sandwich layer resin added 8-10%, top layer resin added 9-12%; Hot pressing temperature 180-220 ℃; Hot pressing time 4-6min.
Urea-formaldehyde resin adhesive of the present invention is different from existing only by mol ratio (mol ratio minimum 1.05 of present domestic formaldehyde and urea) that reduces formaldehyde and urea or the E1 grade urea-formaldehyde resin adhesive that adds the trimeric cyanamide salvage; Be different from by changing the urea-formaldehyde resin synthesis technique, improve initial stage resin condensation degree, add polyvinyl alcohol again, the later stage is reduced free formaldehyde content by means such as dehydrations, improves precompressed; Be different from and be only applicable to the part seeds and the wood gluing goods environment friendly urea-formaldehyde resin adhesive of glue consumption less (as limiting 2 glue-lines) with inferior.Distinctive feature of the present invention be to adopt the special boric acid catalyst of low formaldehyde and urea mol ratio, employing and properties-correcting agent oxalic dialdehyde, W-Gum, under the temperature of reaction of routine, prepare non-dehydration high-performance E1 level environment protection type urea formaldehyde resin and special-purpose solidifying agent, and provide unique using method.
It is unique that the present invention has design, technological specification, easy and simple to handle, equipment is easy to get, non-environmental-pollution, implement easily, lower-price characteristic, can be widely used in multiplying plywood, three-layer real-wood (bamboo, bamboo wood) composite floor board, multi-layer solid wood composite floor, core-board, bentwood furniture, in the gluing technique of products such as shaving board, has good precompressed (room temperature precompressed 40 minutes) in the production, bonding strength height (surpassing 0.5 times of national standard), the product burst size of methanal is lower than the E1 level requirement of GB18580-2001 national standard, and physicochemical property is better than the II generic request of GB/T9846-1993 national standard.Have practical and popularizing value, will produce bigger social environment benefit and economic benefit after the application.
Embodiment
Below in conjunction with embodiment the present invention is further described, but protection scope of the present invention is not limited to embodiment, the equivalence that those skilled in the art are done with technical solution of the present invention changes, and all should belong in the protection domain of the present invention.
Embodiment 1-3: the preparation of the urea-formaldehyde resin among the present invention
Each embodiment raw materials used and consumption such as table 1
Table 1
Preparation method: (with embodiment 1 is example, and other embodiment is identical with embodiment 1 except that the raw material consumption)
(1) with the disposable adding reactor of 3083kg formaldehyde, heat temperature raising back end hydrogenation sodium oxide adjust pH 8.1 when 40 ℃ of temperature of reaction, adds the 1st urea 1275kg (mol ratio of formaldehyde F and urea U is 1.8, sees Table 1 1.).
(2) in 30 minutes, temperature of reaction is raised to 80 ℃ from 40 ℃, and steam off stops heating in the time of the about 50-56 of temperature of reaction ℃, and temperature of reaction rises naturally.Insulation reaction is 30 minutes in the time of 80-88 ℃, survey the pH value and drop at 6.7 o'clock, add 12kg boric acid and the pH value is transferred to 5.4, when temperature of reaction arrives 92-94 ℃ with formic acid, keep polycondensation (the pH value descends along with the temperature rising in natural reaction) to survey the pH value in per 5 minutes, make the pH value can not be lower than 4.2.
(3) when adding boric acid viscosimetric after half an hour, when viscosity reaches 14-14.5 ＂/30 ℃, at once behind the hydro-oxidation sodium adjust pH 6.4, add 30kg trimeric cyanamide (seeing Table 1 1.), kept 10 minutes, and then after adding formic acid adjust pH 5.8, (mol ratio of formaldehyde F and urea U is 1.25 to add the 2nd urea 562kg, see Table 1 2.), insulation reaction in the time of temperature of reaction 92-93 ℃.
(4) continuous viscosimetric, when viscosity reaches 19.5-20.5 ＂/30 ℃, at once behind the hydro-oxidation sodium adjust pH 8.2, add remaining 30kg trimeric cyanamide (seeing Table 1 2.), kept 20 minutes, (mol ratio of formaldehyde F and urea U is 1.0 to add the 3rd urea 459kg then, see Table 1 3.), insulation reaction is 30 minutes when being cooled to 80 ℃, and when viscosity reached 22-24 ＂/30 ℃, (mol ratio of formaldehyde F and urea U was 0.8 to add the 4th urea 574kg, see Table 1 4.), add 20kg oxalic dialdehyde and 80kg W-Gum when being cooled to 50 ℃, keep adjust pH 7.8 after 1 hour, be cooled to 40 ℃ and get urea-formaldehyde resin.
The raw materials used commercial grade that is in the various embodiments described above, formaldehyde content 36.5%; Urea content 98%; Content of melamine 98%; Boric acid content 98%; Glyoxal content 42%; Formic acid and concentration of sodium hydroxide solution 40%.
Embodiment 4-6: the preparation of the solidifying agent among the present invention
Each embodiment raw materials used and consumption such as table 2.
Table 2
| Embodiment | 4 | 5 | 6 |
| Ammonium chloride | 150kg | 180kg | 200kg |
| Iron trichloride | 80kg | 120kg | 150kg |
| Water | 500kg | 650kg | 800kg |
Preparation method: (with embodiment 4 is example, and other embodiment is identical with embodiment 4 except that the raw material consumption)
After 150kg ammonium chloride, 80kg iron trichloride be ground to the above fine powder of 500 orders, under 40-60 ℃ of condition, slowly disperse equably to add in the 500kg water, solidifying agent.
Embodiment 7-12: the application of tackiness agent of the present invention
Raw materials used and the consumption of each embodiment sees Table 3.
Table 3
| Embodiment | 7 | 8 | 9 | 10 | 11 | 12 |
| Urea-formaldehyde resin | 100kg | 100kg | 100kg | 100kg | 100kg | 100kg |
| The plyability filler | 10kg | 15kg | 20kg | 0 | 0 | 0 |
| Papermaking wastewater | 0 | 0 | 0 | 2kg | 3kg | 4kg |
| Solidifying agent | 8kg | 7kg | 5kg | 3kg | 4kg | 5kg |
Embodiment 7-9 is for being used for the using method of laminated products such as multiplying plywood, three-layer real-wood (bamboo, bamboo wood) composite floor board, multi-layer solid wood composite floor, core-board, bending-wood.(with embodiment 7 is example, and embodiment 8,9 is identical with embodiment 7 except that the raw material consumption)
Elder generation slowly adds 10kg plyability filler in the 100kg urea-formaldehyde resin, stirs to add 8kg solidifying agent (consumption of solidifying agent is mainly according to season, and autumn and winter season can be added, and spring and summer can add season less) after 10 minutes again, stirs and can use after 20 minutes.
Heat pressing process: double spread amount 280-320g/m
2Squeeze time 40min; Hot pressing time 1min/mm thickness of slab; Unit pressure 0.7-1.1MPa; Hot pressing temperature: 105-115 ℃.
Embodiment 10-12 is the using method that is used for ordinary particle board and shaving board.(with embodiment 10 is example, and embodiment 11,12 is identical with embodiment 10 except that the raw material consumption)
Earlier 100kg urea-formaldehyde resin and 2kg papermaking wastewater are mixed, and then adding 3kg solidifying agent, stirring to use up in back 2 hours gets final product.
Mask-making technology: glue consumption 120kg/m
3(sandwich layer resin added 8-10%, top layer resin added 9-12%); Hot pressing temperature 180-220 ℃; Hot pressing time 4-6min.
Test example 1: the performance comparison test of tackiness agent of the present invention and domestic and international existing E1 level environment friendly urea-formaldehyde resin adhesive
Tackiness agent of the present invention is compared with domestic and international existing E1 level environment friendly urea-formaldehyde resin adhesive, and its performance comparison test the results are shown in Table 4.
Table 4
| Performance index | Tackiness agent of the present invention | The Norway E1 of Tai Nuo company level urea-formaldehyde glue | Domestic E1 urea-formaldehyde glue |
| Outward appearance | Milky white liquid | White powder or milky white liquid | Milky white liquid |
| Viscosity (mpa.s) | 80～120 | 160～240 | 80～160 |
| Solid content (%) | 48～55 | 50～58 | 55～62 |
| PH value | 7.2～7.8 | 7.5～8.0 | 7.5～8.2 |
| Free formaldehyde content (%) | 0.05～0.10 | 0.08～0.15 | 0.1～0.15 |
| Glue cost (unit/ton) | 1600～1800 | 1800～2000 | 2000～2400 |
| The room temperature pre-molding time (min) | 30～40 | 60～120 | 120～240 |
| Five layers of Cathay poplar glued board burst size of methanal (mg/L) | 0.5～1.2 | 0.8～1.5 | 1.0～1.5 |
| Bonding strength (MPa) | 0.8～1.2 | 0.7～1.0 | 0.5～0.8 |
| 18mm shaving board burst size of methanal (mg/100mg) | 1～6 | 3～8 | 5～10 |
Annotate: add the aqueous liquid shape when Powdered tackiness agent uses in the table, cost is by aqueous calculating; Cost is by the main raw material price: 1800 yuan/ton in urea, 1500 yuan/ton in formaldehyde, trimeric cyanamide calculate for 9000 yuan/ton.
Test example 2: the product performance test of tackiness agent of the present invention
With embodiment 1-6 gained tackiness agent, send national wood-based plate quality surveillance inspection center to test its product performance, test result sees Table 5.
Table 5
| Project | Test result |
| The urea-formaldehyde resin outward appearance | The oyster white thick liquid does not evenly have obvious particle |
| Urea-formaldehyde resin solid content % | 48-55 |
| Urea-formaldehyde resin viscosity (25 ℃) mpa.s | 80-120 |
| The pH value | 7.2-7.8 |
| Free formaldehyde content % | 0.05-0.1 |
| The solidifying agent outward appearance | Tawny liquid |
| Solidifying agent pH value | 0.5-1.5 |
| The working life h of tackiness agent under (25 ℃) | 4-6 |
| Storage period (my god) | 30 |
| The pre-molding time min of tackiness agent under (25 ℃) | 30-40 |
Test example 3: the glue performance test of tackiness agent of the present invention
Tackiness agent of the present invention is respectively applied for the industrial experimentation of hot-press gluing goods such as glued board, core-board, three-layer wood composite flooring, shaving board, and will test each laminated product of gained and give national wood-based plate quality supervision and test center to detect its glue performance, detected result sees Table 6.
Table 6
Conclusion: through above-mentioned evidence, the preparation method of high performance environment friendly urea-formaldehyde resin adhesive of the present invention is workable, the tackiness agent stable performance, characteristics such as have that viscosity is low, free formaldehyde content is low, the storage period under the room temperature and active phase are long, especially have short excellent properties of pre-molding time, can satisfy the requirement of various wood (bamboo) material laminated product production technique.Every physical and chemical index of the multiple laminated product of making by tackiness agent using method of the present invention reaches the corresponding standard requirement fully.Especially in the tackiness agent use, have a strong impact on the room temperature precompressed performance of production efficiency and product percent of pass, be far superior to domestic and international existing like product.
Claims (3)
1, a kind of urea-formaldehyde resin adhesive is made up of urea-formaldehyde resin and solidifying agent two portions, it is characterized in that urea-formaldehyde resin and solidifying agent are respectively by following proportion raw material:
(1) urea-formaldehyde resin:
Total mol ratio 0.8-1.03 of formaldehyde and urea;
The trimeric cyanamide consumption is the 1.5-5% of formaldehyde weight consumption;
The boric acid consumption is the 0.3-0.8% of formaldehyde weight consumption;
The oxalic dialdehyde consumption is the 0.6-0.82% of formaldehyde weight consumption;
The W-Gum consumption is the 2.5-5% of formaldehyde weight consumption:
With formic acid and sodium hydroxide adjust pH,
(2) special curing agent:
Ammonium chloride 150～200 weight parts;
Iron trichloride 80～150 weight parts;
Water 500～800 weight parts,
And adopt following preparation method to make:
(1) preparation of urea-formaldehyde resin:
With the disposable adding reactor of formaldehyde, heat temperature raising back end hydrogenation sodium oxide adjust pH 8.1-8.3, in the time of temperature of reaction 30-40 ℃, the 1st adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.8-2.2;
Temperature of reaction stops heating when reaching 50-56 ℃, when temperature of reaction rises to 80-88 ℃ naturally, and insulation reaction 30 minutes, when treating that the pH value drops to 6.7-6.0, add boric acid and with formic acid adjust pH 5.8-5.0, insulation reaction during temperature of reaction to 92 ℃-94 ℃ makes the pH value be not less than 4.2;
Adding boric acid viscosimetric after half an hour, be issued to 14-14.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 6.6-5.8, the trimeric cyanamide that adds trimeric cyanamide consumption 50%, kept 10 minutes, and then after adding formic acid adjust pH 5.2-6.0, the 2nd adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.35-1.47, insulation reaction during 92 ℃-93 ℃ of temperature of reaction;
Be issued to 19.5-20.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 8.0-8.3, the trimeric cyanamide that adds residue 50%, kept 20 minutes, add urea the 3rd time, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.0-1.1, insulation reaction is 30 minutes when being cooled to 80 ℃, be issued to 22-24 during second when being coated with-4 viscosity 30 ℃ of conditions, the 4th adds urea, and add-on is that the mol ratio of formaldehyde and urea is the urea of 0.8-1.03, add oxalic dialdehyde and W-Gum when being cooled to 50 ℃, after keeping 1 hour adjust pH 7.2-7.8, be cooled to 40 ℃ and promptly get urea-formaldehyde resin
(2) preparation of solidifying agent:
After ammonium chloride, the iron trichloride of described weight part be ground to the above fine powder of 500 orders, under 40-60 ℃ of condition, slowly disperse equably to add in the entry, promptly get solidifying agent.
2, the preparation method of the described urea-formaldehyde resin adhesive of claim 1 is characterized in that the preparation method is as follows:
(1) preparation of urea-formaldehyde resin:
With the disposable adding reactor of formaldehyde, heat temperature raising back end hydrogenation sodium oxide adjust pH 8.1-8.3, in the time of temperature of reaction 30-40 ℃, the 1st adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.8-2.2;
Temperature of reaction stops heating when reaching 50-56 ℃, when temperature of reaction rises to 80-88 ℃ naturally, and insulation reaction 30 minutes, when treating that the pH value drops to 6.7-6.0, add boric acid and with formic acid adjust pH 5.8-5.0, insulation reaction during temperature of reaction to 92 ℃-94 ℃ makes the pH value be not less than 4.2;
Adding boric acid viscosimetric after half an hour, be issued to 14-14.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 6.6-5.8, the trimeric cyanamide that adds trimeric cyanamide consumption 50%, kept 10 minutes, and then after adding formic acid adjust pH 5.2-6.0, the 2nd adding urea, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.35-1.47, insulation reaction during 92 ℃-93 ℃ of temperature of reaction;
Be issued to 19.5-20.5 during second when being coated with-4 viscosity 30 ℃ of conditions, at once behind the hydro-oxidation sodium adjust pH 8.0-8.3, the trimeric cyanamide that adds residue 50%, kept 20 minutes, add urea the 3rd time, add-on is that the mol ratio of formaldehyde and urea is the urea of 1.0-1.1, insulation reaction is 30 minutes when being cooled to 80 ℃, be issued to 22-24 during second when being coated with-4 viscosity 30 ℃ of conditions, the 4th adds urea, and add-on is that the mol ratio of formaldehyde and urea is the urea of 0.8-1.03, add oxalic dialdehyde and W-Gum when being cooled to 50 ℃, after keeping 1 hour adjust pH 7.2-7.8, be cooled to 40 ℃ and promptly get urea-formaldehyde resin
(2) preparation of solidifying agent:
After ammonium chloride, the iron trichloride of described weight part be ground to the above fine powder of 500 orders, under 40-60 ℃ of condition, slowly disperse equably to add in the entry, promptly get solidifying agent.
3, the purposes of the described urea-formaldehyde resin adhesive of claim 1 is characterized in that being used for multiplying plywood, three-layer real-wood, bamboo, bamboo compound floor, multi-layer solid wood composite floor, core-board, bentwood furniture, the gummed of shaving board or shaving board.
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2006
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Address after: Room third, teaching building, School of transportation, Beihua University, 3999 Huashan Road, Fengman District, Jilin, Jilin, Patentee after: Shi Junyou Address before: Traffic school, West Campus of Beihua University, 32 Taishan Road, Fengman District, Jilin, Jilin Patentee before: Shi Junyou |
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Assignee: JILIN CHENLONG BIOMASS MATERIALS CO., LTD. Assignor: Shi Junyou Contract record no.: 2010220000044 Denomination of invention: High performance environment friendly urea-formaldehyde resin adhesive and its preparing method and use Granted publication date: 20090624 License type: Exclusive License Open date: 20070411 Record date: 20100920 |
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