CN100497424C - Urea formaldehyde resin, and preparation method - Google Patents
Urea formaldehyde resin, and preparation method Download PDFInfo
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- CN100497424C CN100497424C CNB2007100626570A CN200710062657A CN100497424C CN 100497424 C CN100497424 C CN 100497424C CN B2007100626570 A CNB2007100626570 A CN B2007100626570A CN 200710062657 A CN200710062657 A CN 200710062657A CN 100497424 C CN100497424 C CN 100497424C
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Abstract
This invention discloses a method for preparing urea-formaldehyde resin, which is prepared from: formaldehyde 200 parts, urea 100-250 parts, poly (vinyl alcohol) 0.5-6 parts, accelerator 0.05-0.5 part, and additive 0.5-5 parts. The concentration of formaldehyde is higher than 42%. During the reaction process, urea is added in batches, so the raw materials react in strongly acidic, neutral to week alkaline, weak acidic and neutral media in sequence. The prepared urea-formaldehyde resin has a free formaldehyde content of only 0.05-0.20%. The production of artificial board, such as flake board and low/high density fiberboard, from the urea-formaldehyde resin has such advantages as no need for vacuum dehydration treatment, no wastewater discharge, short production period, and low fuel and energy consumption. The artificial board, when compared with that produced from low-concentration formaldehyde (37%), has such advantages as obviously improved physical and mechanical properties, and low free formaldehyde content.
Description
Technical field
The present invention relates to a kind of urea-formaldehyde resin and preparation method thereof, particularly a kind of urea-formaldehyde resin of producing wood-based plate and preparation method thereof that is used to.
Background technology
Reform and open up to the outside world over nearly 30 years, the timber industry of China has obtained unconventional fast development.China's wood-based plate (fiberboard, shaving board and glued board) in 2004 ultimate production 5446.5 ten thousand steres, reached 6393 ten thousand steres in 2005, amplification reaches 17.4%, be 3.19 times in 2000, risen to the first in the world Wood-based Panel Production big country, wherein, 2005 the adhesive of artificial board consumption (100% solid content meter) above 3,500,000 tons, and urea-formaldehyde resin adhesive accounts for more than 90% of wood-based plate glue consumption, is the kind of consumption maximum in the tackiness agent.Why urea-formaldehyde resin adhesive can use in timber industry in a large number, is because it has incomparable busy of other resin, mainly is its raw material abundance, cheap, is cheapest in the synthetic resins.In addition, urea-formaldehyde resin also has lot of advantages, and is higher as Joint strength, solidifies rapidly, and the glue-line after the curing is of light color, can not pollute by the plate face of agglutinent, and good water solubility easily is modulated to needed appropriate viscosity and concentration.
But well-known, urea-formaldehyde resin also has some significant disadvantages, poor except ageing resistance, hot water resistance is poor, can not be as outdoor wood-based plate with the glue, its fatal shortcoming is that cementitious wood-based plate exists formaldehyde to discharge problem.Raising day by day along with the outdoor interior Environmental awareness of people, health perception, quality of life consciousness, people notice that more and more urea-formaldehyde resin adhesive in use can emit formaldehyde, it glueds joint wood-based plate also can constantly discharge formaldehyde in the process of using, polluted air, the infringement people's is healthy; Particularly be with formaldehyde disposal of pollutants problem in the used for shaving board urea-formaldehyde resin production process in addition, very big to surrounding environment harm.
At present, in the urea-formaldehyde resin manufacturing processed, generally adopting concentration is that 37% formaldehyde and urea carry out polycondensation and forms urea-formaldehyde resin under catalyzer and certain reaction conditions.Because the concentration of formaldehyde is lower, therefore usually need to carry out vacuum hydro-extraction in the urea-formaldehyde resin manufacturing processed, this has not only increased postorder workshop section difficulty, has prolonged the production cycle, increased the consumption of Ministry Of Fuel And Power power, and the waste water of discharging contains pollutent such as free formaldehyde and pollutes the environment; The reactive behavior of low concentration formaldehyde is less relatively, when synthesizing urea-formaldehyde resin, if the mol ratio of formaldehyde and urea is low excessively, though can reduce the free formaldehyde content in the synthetic urea-formaldehyde resin, but the water-soluble decline of the urea-formaldehyde resin of making, shortening storage period, prolongation set time, curing performance variation, when being used for Wood-based Panel Production, can cause the physical and mechanical property of wood-based plate, durable and all decline to some extent of water resistance; If the mol ratio of formaldehyde and urea is higher, though guaranteed the physical and mechanical property of wood-based plate, free formaldehyde content enlarges markedly in the wood-based plate that causes again making.
Summary of the invention
The objective of the invention is problem at the prior art existence, a kind of urea-formaldehyde resin and preparation method thereof is provided, urea-formaldehyde resin of the present invention is to obtain by employing high-concentration formaldehyde and urea reaction, and finished product has low content of free formaldehyde content, has cancelled dehydration procedure in the urea-formaldehyde resin production process; The wood-based plate that utilizes urea-formaldehyde resin of the present invention to produce, its every physical and mechanical property is significantly increased, and burst size of methanal significantly reduces simultaneously, under the condition that guarantees the every physical and mechanical property of wood-based plate, can reduce the glue consumption.
For realizing the object of the invention, urea-formaldehyde resin of the present invention is 200 parts in formaldehyde, urea 100-250 part, polyvinyl alcohol 0.5-6 part, promotor by weight proportion mainly: 0.05-0.5 part, auxiliary agent: the raw material reaction of 0.5-3 part is made.
In addition, for realizing the object of the invention, the preparation method of urea-formaldehyde resin of the present invention comprises with urea and divides the mode that adds for three times or four times that above-mentioned raw materials is mixed, and it is reacted to weak alkaline medium, weak acidic medium, neutral medium in strongly-acid, neutrality successively.
In addition, for realizing the object of the invention, the preparation method of urea-formaldehyde resin of the present invention comprises the following steps of utilizing above-mentioned raw materials to carry out successively:
1) in reactor, adds formaldehyde, polyvinyl alcohol, add promotor again, detect the pH value, pH=1.8-3.5;
2) add urea for the first time, in 5-15 minute, be warming up to 50 ± 10 ℃, and under this temperature condition insulation reaction, after cloud point occurring in reaction to the 30 ℃ water, transfer pH=7.0-9.0 with sodium hydroxide solution, add urea for the second time, be warming up to 80-90 ℃ with 35-50 minutes, transfer pH=6.0-6.9, be incubated 10-45 minutes;
3) transfer pH=4.0-5.2 with formic acid, continue reaction, reach: 80 ℃, be coated with-4 glasss of 11-25 seconds until viscosity;
4) adding auxiliary agent and urea for the third time are cooled to 75-85 ℃, transfer pH=6.0-7.5 with sodium hydroxide solution, react 10-35 minute;
5) be cooled to 60-80 ℃, or add urea the 4th time, be cooled to below 50 ℃, transfer pH=7.5-9.0 with sodium hydroxide solution, discharging.
Wherein the urea amount that adds for first to fourth time is respectively 5-35%, 30-60%, 10-25%, 0-35% of urea total amount.
Particularly, the weight proportion of raw material is preferably: 200 parts in formaldehyde, urea 150-220 part, polyvinyl alcohol 0.5-3 part, promotor 0.1-0.3 part, auxiliary agent 1-2 part, sodium hydroxide is an amount of, formic acid is an amount of.
Particularly, the concentration of formaldehyde is 42-55%, preferred 45-50%.
Particularly, promotor is acid, is selected from the acid such as phosphoric acid, hydrochloric acid, maleic anhydride, sulfuric acid one or more.
Particularly, auxiliary agent is one or more in the amine substance, at least a in preferred urotropine, the trolamine.
The advantage of product of the present invention is:
1. adopt urea-formaldehyde resin of the present invention produce wood-based plate such as shaving board, in/when high density fiberboard and glued board, not needing to carry out vacuum hydro-extraction in the urea-formaldehyde resin building-up process of the present invention handles, therefore emit no waste water, shortened the production cycle, reduced the consumption of Ministry Of Fuel And Power power.
2. urea-formaldehyde resin of the present invention is because of adopting high-concentration formaldehyde, and its reactive behavior increases greatly, has greatly promoted the abundant reaction between formaldehyde and the urea, on year-on-year basis with the same mol ratio urea-formaldehyde resin of low concentration formaldehyde preparation, its free formaldehyde content is low, and less than 0.2%, curing performance significantly improves;
3. compare the wood-based plate of use with the wood-based plate of urea-formaldehyde resin preparation of the present invention by the same mol ratio urea-formaldehyde resin preparation of low concentration formaldehyde preparation, not only significantly improve every physical and mechanical property of wood-based plate, and greatly reduced the burst size of methanal in the wood-based plate; Compare the wood-based plate of the low mol ratio urea-formaldehyde resin that uses the low concentration formaldehyde preparation, under the prerequisite that guarantees at every physical and mechanical property of wood-based plate, reduce the glue consumption more than 10%, saved the manufacturing cost of wood-based plate greatly.
Embodiment
Embodiment one
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 45 | |
| Urea | 156 | 98 | U1＝25 |
| U2＝65 U3＝40 U4＝26 | |||
| Polyvinyl alcohol | 1 | 1799 types | |
| Maleic anhydride | 04 | 100 | |
| Urotropine | 1 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.18.
Concrete reactions steps comprises:
1) add formaldehyde, polyvinyl alcohol in reactor, add maleic anhydride again, pH value, pH=2.0-2.5 are detected in the back that stirs;
2) add urea for the first time, be warming up to 50 ± 2 ℃ of temperature at 15 minutes internal heating. after cloud point occurring in insulation reaction to the 30 ℃ water (promptly, reaction solution is splashed in the beaker that fills 30 ℃ of clear water, seen that white cloud point is a terminal point), transfer pH=7.0 with sodium hydroxide solution, add urea for the second time, be warming up to 85-90 ℃ with 45 fens clock times, transfer pH=6.5, be incubated 30 minutes;
3) transfer pH=4.9 with formic acid, continue reaction, reach until viscosity: be coated with-4 glasss 20 seconds (80 ℃);
4) adding urotropine and urea for the third time are cooled to 80 ℃, transfer pH=6.5 with sodium hydroxide solution, react 25 minutes;
5) be cooled to 60 ℃, add urea the 4th time, be cooled to below 50 ℃, transfer pH=8.0 with sodium hydroxide solution, discharging.
The resin quality index:
Solids content 61-64%
PH value 7.5-8.0
Viscosity (20 ℃) 33-40 (S is coated with-4 glasss)
Curing speed 45-60 second
Free formaldehyde content＜0.25%
Water-soluble 〉=1.0
Storage period 〉=15 day
Resin reaction time and cost:
The resin reaction time: 6 hours; Resin cost: 1750 yuan/ton.
Comparative example one
Adopt a kind of preparation of urea-formaldehyde resin commonly used of prior art.Wherein:
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 37 | |
| Urea | 128 | 98 | U1＝75 U2＝35 U3＝18 |
| Polyvinyl alcohol | 1 | 1799 types | |
| Urotropine | 1 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.18
Concrete reactions steps comprises:
1) in reactor, adds formaldehyde, transfer pH=8.0, add polyvinyl alcohol and the urea first time, be warming up to 90 ℃, transfer pH=6.5, be incubated 30 minutes with sodium hydroxide solution;
2) transfer pH=4.9 with formic acid, continue reaction, reach until viscosity: be coated with-4 glasss 15 seconds (80 ℃);
3) add urotropine and the urea second time, be cooled to 80 ℃, transfer pH=6.5, reacted 25 minutes with sodium hydroxide solution;
5) transfer pH=7.5 with sodium hydroxide solution, under 75 ℃ of temperature condition, dewater, 4 hours dehydrating amount 70-75kg;
6) be cooled to 60 ℃, add urea for the third time, be cooled to below 50 ℃, transfer pH=8.5 with sodium hydroxide solution, discharging.
The resin quality index:
Solids content 63-65%
PH value 7.5-8.5
Viscosity (20 ℃) 40-50 (S is coated with-4 glasss)
Curing speed 45-60 second
Free formaldehyde content＜0.3%
Water-soluble 〉=1.0
Storage period 〉=15 day
Resin reaction time and cost:
The resin reaction time: 10 hours; Resin cost: 1980 yuan/ton.
Experimental example one
The urea-formaldehyde resin that adopts embodiment one method and comparative example one method to produce respectively prepares 16mm and 18mm shaving board, all carries out technology as shown in table 1 below during production:
16mm and 18mm shaving board to above-mentioned technological process manufacturing detect, and the method for inspection is pressed density, water ratio, thickness swelling rate, internal bond strength, MOR, surface bonding strength, the burst size of methanal (perforation method) that GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique " detects test specimen. and detected result is as shown in table 2.
Table 2
This shows, because the reaction times of preparation urea-formaldehyde resin of the present invention is 6 hours, and by the reaction times of the same mol ratio urea-formaldehyde resin of low concentration formaldehyde preparation be 10 hours, therefore the present invention has shortened the reaction times of preparation urea-formaldehyde resin greatly, the shortening amplitude is 40%, therefore reduce the energy consumption of vacuum pump, can save 40% the electricity charge.
In addition, as seen from Table 2, using urea-formaldehyde resin to prepare in the technology of shaving board, compare urea-formaldehyde resin with the prepared formaldehyde of 37% concentration, the present invention can make the physical and mechanical property of shaving board improve greatly with the urea-formaldehyde resin of high-concentration formaldehyde preparation, and wherein internal bond strength improves 31.7%, and MOR improves 50.3%, thickness swelling rate has descended 25%, and burst size of methanal reduces by 54.0%.
Embodiment two
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 50 | |
| Urea | 173 | 98 | U1＝30 U2＝75 U3＝45 U4＝23 |
| Polyvinyl alcohol | 5 | 1799 types | |
| Phosphoric acid | 0.4 | 100 | |
| Urotropine | 3 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.18
Concrete reactions steps is with embodiment one
The resin quality index:
Solids content 64-66%
PH value 7.5-8.0
Viscosity (20 ℃) 33-40 (S is coated with-4 glasss)
Curing speed 45-60 second
Free formaldehyde content＜0.2%
Water-soluble 〉=1.0
Storage period 〉=15 day
Resin reaction time and cost:
The resin reaction time: 6 hours; Resin cost: 1850 yuan/ton.
Comparative example two
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 37 | |
| Urea | 142 | 98 | U1＝75 U2＝50 U3＝17 |
| Polyvinyl alcohol | 5 | 1799 types | |
| Urotropine | 3 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.06
Concrete reactions steps is with comparative example one.
The resin quality index:
Solids content 64-66%
PH value 7.5-8.5
Viscosity (20 ℃) 40-50 (S is coated with-4 glasss)
Curing speed 45-60 second
Free formaldehyde content＜0.2%
Water-soluble 〉=1.0
Storage period 〉=15 day
Resin reaction time and cost:
The resin reaction time: 10 hours; Resin cost: 1960 yuan/ton.
Experimental example two
The urea-formaldehyde resin that employing is produced by embodiment two methods and comparative example two methods prepares 12mm and 16mm shaving board respectively, all carries out following same process during production but resin added difference (seeing Table 3):
Table 3
Use two kinds of urea-formaldehyde resin adhesives respectively, 12mm and 16mm shaving board to above-mentioned technological process manufacturing detect, the method of inspection is pressed density, water ratio, thickness swelling rate, internal bond strength, MOR, surface bonding strength, the burst size of methanal (perforation method) that GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique " detects test specimen, and detected result is as shown in table 4.
Table 4
Experimental example is two results show, compares the urea-formaldehyde resin by the low concentration formaldehyde preparation, adopts the urea-formaldehyde resin of the embodiment of the invention two to prepare shaving board, and under the condition that the every physical and mechanical property of shaving board does not reduce, the glue consumption reduces more than 10%; The urea-formaldehyde resin of the high concentrated formaldehyde of the embodiment of the invention two (mol ratio of formaldehyde and urea is 1.18) preparation, the shaving board burst size of methanal of its preparation is equivalent to use the shaving board of the urea-formaldehyde resin preparation of low concentration formaldehyde (mol ratio of formaldehyde and urea is 1.06).
Embodiment three
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 45 | |
| Urea | 167 | 98 | U1＝25 U2＝65 U3＝40 U4＝37 |
| Polyvinyl alcohol | 1 | 1799 types | |
| Maleic anhydride | 0.4 | 100 | |
| Trolamine | 1 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.10
Concrete reactions steps is with embodiment one.
The resin quality index:
Solids content 61-64%
PH value 7.5-8.0
Viscosity (20 ℃) 19-21 (S is coated with-4 glasss)
Curing speed 45-60 second
Free formaldehyde content＜0.2%
Water-soluble 〉=1.0
Storage period 〉=20 day
Comparative example three
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 37 | |
| Urea | 137 | 98 | U1＝75 U2＝35 U3＝27 |
| Polyvinyl alcohol | 1 | 1799 types | |
| Trolamine | 1 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.10
Concrete reactions steps is with comparative example one.
The resin quality index:
Solids content 61-64%
PH value 7.5-8.5
Viscosity (20 ℃) 19-21 (S is coated with-4 glasss)
Curing speed 45-60 second
Free formaldehyde content＜0.3%
Water-soluble 〉=1.0
Storage period 〉=20 day
Experimental example three
The urea-formaldehyde resin that employing is produced by embodiment three methods and comparative example three methods prepares 12mm high density fiberboard and 18mm medium density fibre board (MDF) respectively, all carries out following production technique (seeing Table 5) during production:
Table 5
Use two kinds of urea-formaldehyde resin adhesives respectively, 12mm high density fiberboard and 18mm medium density fibre board (MDF) to above-mentioned technological process manufacturing detect, the method of inspection is pressed density, water ratio, thickness swelling rate, internal bond strength, MOR, surface bonding strength, the burst size of methanal (perforation method) that GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique " detects test specimen, and detected result is as shown in table 6.
Table 6
From embodiment three, comparative example three and table 6 as seen, under identical fiberboard preparation technology, compare 12mm high density fiberboard and the 18mm medium density fibre board (MDF) produced by the same mol ratio urea-formaldehyde resin of low concentration formaldehyde preparation, adopt urea-formaldehyde resin of the present invention on average to make the fiberboard internal bond strength improve 44.8%, MOR improves 19.8%, thickness swelling rate has descended 16.1%, and burst size of methanal reduces by 53.5%.
Embodiment four
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 55 | |
| Urea | 220 | 98 | U1＝35 U2＝75 U3＝50 U4＝60 |
| Polyvinyl alcohol | 5 | 1799 types | |
| Maleic anhydride | 0.2 | 100 | |
| Trolamine | 3 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.02.
Concrete reactions steps is with embodiment one.
The resin quality index:
Solids content 64-66%
PH value 7.5-8.0
Viscosity (20 ℃) 19-21 (S is coated with-4 glasss)
Curing speed 55-65 second
Free formaldehyde content＜0.15%
Water-soluble 〉=1.0
Storage period 〉=15 day
Comparative example four
Composition of raw materials:
| Raw material | Weight (kg) | Content (%) | Remarks |
| Formaldehyde | 200 | 37 | |
| Urea | 148 | 98 | U1＝75 U2＝33 U3＝40 |
| Polyvinyl alcohol | 5 | 1799 types | |
| Trolamine | 3 | 98 | |
| Formic acid | In right amount | 20 | Regulate pH value |
| Sodium hydroxide | In right amount | 30 | Regulate pH value |
Annotate: the mol ratio of formaldehyde and urea is 1.02.
Concrete reactions steps is with comparative example one.
The resin quality index:
Solids content 61-64%
PH value 7.5-8.5
Viscosity (20 ℃) 19-21 (S is coated with-4 glasss)
Curing speed 45-60 second
Free formaldehyde content＜0.25%
Water-soluble 〉=1.0
Storage period 〉=20 day
Experimental example four
The urea-formaldehyde resin that employing is produced by embodiment four directions method and comparative example four directions method prepares 12mm high density fiberboard and 18mm medium density fibre board (MDF) respectively, all carries out following production technique (seeing Table 7) during production:
Table 7
12mm high density fiberboard and 18mm medium density fibre board (MDF) to above-mentioned technological process manufacturing detect, the method of inspection is pressed density, water ratio, thickness swelling rate, internal bond strength, MOR, surface bonding strength, the burst size of methanal (perforation method) that GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique " detects test specimen, and detected result is as shown in table 8.
Table 8
By table 8 as seen, under identical fiberboard preparation technology, compare 12mm high density fiberboard and the 18mm medium density fibre board (MDF) produced by the same mol ratio urea-formaldehyde resin of low concentration formaldehyde preparation, use urea-formaldehyde resin of the present invention on average to make the fiberboard internal bond strength improve 46.7%, MOR improves 23.0%, thickness swelling rate has descended 11.3%, and burst size of methanal reduces by 46.3%.
Claims (6)
1, a kind of urea-formaldehyde resin, it is characterized in that raw material comprises the component of following weight proportion: 200 parts of high-concentration formaldehydes, urea 100-250 part, polyvinyl alcohol 0.5-6 part, promotor: 0.05-0.5 part, auxiliary agent: 0.5-3 part, wherein the concentration range of high-concentration formaldehyde is 42-55%, and auxiliary agent is selected from least a in urotropine, the trolamine.
2, urea-formaldehyde resin as claimed in claim 1 is characterized in that: the concentration range of described high-concentration formaldehyde is 45-50%.
3, urea-formaldehyde resin as claimed in claim 1 or 2 is characterized in that described raw material weight proportion optimization: 200 parts of high-concentration formaldehydes, urea 150-220 part, polyvinyl alcohol 0.5-3 part, promotor 0.1-0.3 part, auxiliary agent 1-2 part.
4, urea-formaldehyde resin as claimed in claim 1 or 2 is characterized in that: described promotor is selected from one or more in phosphoric acid, hydrochloric acid, maleic anhydride, the sulfuric acid.
5, the preparation method of urea-formaldehyde resin as claimed in claim 1 or 2 is characterized in that the step that comprises that next coming in order carry out:
1) in reactor, adds high-concentration formaldehyde, polyvinyl alcohol, add promotor again, detect the pH value, transfer pH
＝1.8—3.5；
2) adding urea for the first time, is 40-60 ℃ of following insulation reaction in temperature, when reaction cloud point occurs to 30 ℃ of water, transfers pH=7.0-9.0 with sodium hydroxide solution, adds urea for the second time, is warming up to 80-90 ℃, transfers pH=6.0-6.9, is incubated 10-45 minute;
3) transfer pH=4.0-5.2 with formic acid, continue reaction, reach: 80 ℃, be coated with-4 glasss of 11-25 seconds until viscosity;
4) adding auxiliary agent and urea for the third time are cooled to 75-85 ℃, transfer pH=6.0-7.5 with sodium hydroxide solution, react 10-35 minute;
5) be cooled to 60-80 ℃, add urea the 4th time; Be cooled to below 50 ℃, transfer pH=7.5-9.0 with sodium hydroxide solution, discharging,
Wherein, the urea amount that adds for first to fourth time is respectively the urea gross weight: 5-35%, 30-60%, 10-50%, 0-35%.
6, preparation method as claimed in claim 5 is characterized in that: described promotor is selected from one or more in phosphoric acid, hydrochloric acid, maleic anhydride, the sulfuric acid.
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| CN1884332A (en) * | 2006-06-08 | 2006-12-27 | 崔万发 | Urea-formaldehyde resin and its preparation method |
-
2007
- 2007-01-12 CN CNB2007100626570A patent/CN100497424C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041161A (en) * | 1988-09-16 | 1990-04-11 | 薛志纯 | modified polyvinyl formal and preparation thereof |
| JP3131692B2 (en) * | 1990-02-16 | 2001-02-05 | 日本化成株式会社 | Urea resin manufacturing method |
| CN1121084A (en) * | 1994-10-21 | 1996-04-24 | 遵化市钟馗实业公司 | Low-poison synthetic urea-formaldehyde resin glue and its production method |
| CN1304942A (en) * | 2000-05-12 | 2001-07-25 | 中国石油天然气股份有限公司兰州石化分公司 | Water-proof lower-aldehyde urea-formaldehyde resin and its preparing process |
| CN1884332A (en) * | 2006-06-08 | 2006-12-27 | 崔万发 | Urea-formaldehyde resin and its preparation method |
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| CN101003610A (en) | 2007-07-25 |
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