CN1621477A - Urea-formaldehyde glue with low content of free aldehyde and its preparing method - Google Patents
Urea-formaldehyde glue with low content of free aldehyde and its preparing method Download PDFInfo
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- CN1621477A CN1621477A CN 200410067235 CN200410067235A CN1621477A CN 1621477 A CN1621477 A CN 1621477A CN 200410067235 CN200410067235 CN 200410067235 CN 200410067235 A CN200410067235 A CN 200410067235A CN 1621477 A CN1621477 A CN 1621477A
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Abstract
The present invention relates to adhesive, and is especially one kind of urea formaldehyde adhesive with low free aldehyde content. The adhesive of the present invention is prepared with urean and formaldehyde through addition reaction at pH value of 8.5 and 90 deg.c while adding small amount of melamine and oxidized starch. The urea formaldehyde adhesive has high viscosity, high adhesion strength, boiling water resistance, low cost and less environmental pollution, and may be used in producing plant fiber product with no environmental pollution.
Description
The present invention relates to a kind of tackiness agent, is a kind of higher bonding strength that has, and water tolerance, thermotolerance are not preferably polluted the urea-formaldehyde glue of the low content of free aldehyde of vegetable fibre laminated product.
Wood working and indoor decoration need a large amount of tackiness agent, but be used on the market tackiness agent such as shaving board that furniture makes, medium density fibre board (MDF) etc. and the glued board of indoor decoration, light body plate mostly formaldehyde exceed standard the health of serious harm human body.
The tackiness agent complete processing complexity of the common usefulness of timber-work, the package stability deterioration of the urea-formaldehyde glue that has; The adding tackifier that have shorten the storage period of urea-formaldehyde glue, and not anti-boiling water; The urea-formaldehyde glue production cost that also has is too high, has increased the weight of environmental pollution.
It is easy to operate to the purpose of this invention is to provide a kind of complete processing, reduces production costs, and reduces environmental pollution, improves the performance of urea-formaldehyde glue, and the bonding strength height is water-fast, heat-resisting, does not pollute the urea-formaldehyde glue of the low content of free aldehyde of vegetable fibre laminated product.
The principal feature and the advantage of the urea-formaldehyde glue of low content of free aldehyde of the present invention are:
1. the addition reaction stage of urea and formaldehyde carries out under pH value 8.5 conditions, and in the mol ratio of this phasic change urea and formaldehyde.Remain on 90 ℃ in addition reaction and polycondensation phase temperature.
2. the method for time adding urea realizes the alap content of free aldehyde of urea-formaldehyde glue liquid in three batches.
3. production process only need be added a small amount of trimeric cyanamide and Sumstar 190, and the urea-formaldehyde glue content of free aldehyde of making is lower.
4. urea-formaldehyde glue viscosity height of the present invention, strong, the anti-boiling water of gummed degree is good, cost is low, reduce the environmental pollution that produces in the use, can be made into the environment protection plant fibre laminated product.
The urea-formaldehyde glue of low content of free aldehyde of the present invention is realized by following formula rate and preparation technology.
Formula rate: total mol ratio: urea: formaldehyde=1: 0.8～1.2
Raw material: urea: technical grade molecular weight 60 purity are calculated by 100%
Formaldehyde: technical grade molecular weight 30 37%
Caustic soda: technical grade is made into 20% solution
Formic acid: technical grade is made into 10% solution
Ammonium chloride: technical grade is made into 20% solution
Trimeric cyanamide: 1%～3% of urea gross weight
Sumstar 190: 1%～10% of urea and formaldehyde gross weight
Complete processing:
1. with in whole formaldehyde injecting reactors, use 20% caustic soda soln, after the adjusting pH value reaches 8.5, be 1: 1.85～2.77 first urea of adding by urea/formaldehyde mole ratio, and reacting liquid temperature is grown steadily after 90 ℃, be incubated 15 minutes.
2. regulating pH value with 10% formic acid and reach 4.8～5.0, continue to be incubated 30 minutes about 90 ℃, is 1: 1.69～2.54 by urea/formaldehyde mole ratio, adds second batch of urea, and repeatedly measures the reaction end of urea-formaldehyde glue liquid.
3. after reaching reaction end, drip 20% caustic soda, make the glue pH value reach 7.5～8.0, when being cooled to 65～70 ℃, add the 3rd batch of urea.Below 40 ℃, transfer pH value to reach 7.5～8.0 at 25 minutes postcooling of 50～60 ℃ of insulations, reaction finishes.
4. must transfer pH value before the use glue, get the glue that uses in 3 to 4 hours, with the 20% ammonia chloride solution accent glue of getting, after stirring, make it be slightly acidic, pH value reaches 6 urea-formaldehyde glues that promptly get low content of free aldehyde of the present invention.
5. for strengthening waterproof effect, can in the glue that takes out, add 1%～3% trimeric cyanamide and 1%～10% Sumstar 190.
In order to further specify formula rate of the present invention and preparation technology, embodiments of the invention are as follows:
Formula rate: total mol ratio: urea: formaldehyde=1: 1
Raw material: urea: technical grade molecular weight 60, purity is calculated by 100%
Formaldehyde: technical grade molecular weight 30 37%
Caustic soda: technical grade is made into 20% solution
Formic acid: technical grade is made into 10% solution
Ammonium chloride: technical grade is made into 20% solution
Trimeric cyanamide: 2% of urea gross weight
Sumstar 190: 5% of urea and formaldehyde gross weight
Complete processing:
1. with in whole formaldehyde 45.98kg injecting reactors, use 20% caustic soda soln, after the adjusting pH value reaches 8.5, be 1: 2.31 each batch of adding urea 14.73kg by urea/formaldehyde mole ratio, and reacting liquid temperature is grown steadily after 90 ℃, be incubated 15 minutes.
2. regulating pH value with 10% formic acid and reach 4.8～5.0, continue to be incubated 30 minutes about 90 ℃, is 1: 2.11 by urea/formaldehyde mole ratio, adds second crowd of urea 1.4kg, and repeatedly measures the reaction end of urea-formaldehyde glue liquid.
3. after reaching reaction end, drip 20% caustic soda, make the glue pH value reach 7.5～8.0, when being cooled to 65～70 ℃, add the 3rd crowd of urea 17.89kg.Below 40 ℃, transfer pH value to reach 7.5～8.0 at 25 minutes postcooling of 50～60 ℃ of insulations, reaction finishes.
4. must transfer pH value before the use glue, get the glue that uses in 3 to 4 hours, with the 20% ammonia chloride solution accent glue of getting, after stirring, make it be slightly acidic, pH value reaches the 6 urea-formaldehyde glue 80kg that promptly get low content of free aldehyde of the present invention.
5. for strengthening waterproof effect, can in the glue that takes out, add 2% trimeric cyanamide and 5% Sumstar 190.
Claims (2)
1, the urea-formaldehyde glue of a kind of low content of free aldehyde of the present invention is realized by following formula rate and preparation technology.It is characterized in that:
Formula rate: total mol ratio: urea: formaldehyde=1: 0.8～1.2
Raw material: urea: technical grade molecular weight 60, purity is calculated by 100%
Formaldehyde: technical grade molecular weight 30 37%
Caustic soda: technical grade is made into 20% solution
Formic acid: technical grade is made into 10% solution
Ammonium chloride: technical grade is made into 20% solution
Trimeric cyanamide: 1%～3% of urea gross weight
Sumstar 190: 1%～10% of urea and formaldehyde gross weight
Complete processing:
A. with in whole formaldehyde injecting reactors, use 20% caustic soda soln, after the adjusting pH value reaches 8.5, be 1: 1.85～2.77 first urea of adding by urea/formaldehyde mole ratio, and reacting liquid temperature is grown steadily after 90 ℃, be incubated 15 minutes.
B. regulating pH value with 10% formic acid and reach 4.8～5.0, continue to be incubated 30 minutes about 90C, is 1: 1.69～2.54 by urea/formaldehyde mole ratio, adds second batch of urea, and repeatedly measures the reaction end of urea-formaldehyde glue liquid.
C. after reaching reaction end, drip 20% caustic soda, make the glue pH value reach 7.5～8.0, when being cooled to 65～70 ℃, add the 3rd batch of urea.Below 40 ℃, transfer pH value to reach 7.5～8.0 at 25 minutes postcooling of 50～60 ℃ of insulations, reaction finishes.
D. use before the glue and must transfer pH value, get the glue that uses in 3 to 4 hours, with the 20% ammonia chloride solution accent glue of getting, after stirring, make it be slightly acidic, pH value reaches 6 urea-formaldehyde glues that promptly get low content of free aldehyde of the present invention.
E. for strengthening waterproof effect, can in the glue that takes out, add 1%～3% trimeric cyanamide and 1%～10% Sumstar 190.
2, formula rate and the preparation technology according to best among the formula rate of the urea-formaldehyde glue of the present invention described in the claim 1 and the preparation technology is as follows:
Formula rate: total mol ratio: urea: formaldehyde=1: 1
Raw material: urea: technical grade molecular weight 60, purity is calculated by 100%
Formaldehyde: technical grade molecular weight 30 37%
Caustic soda: technical grade is made into 20% solution
Formic acid: technical grade is made into 10% solution
Ammonium chloride: technical grade is made into 20% solution
Trimeric cyanamide: 2% of urea gross weight
Sumstar 190: 5% of urea and formaldehyde gross weight
Complete processing:
A. with in whole formaldehyde 45.98kg injecting reactors, use 20% caustic soda soln, after the adjusting pH value reaches 8.5, be 1: 2.31 first urea of adding 14.73kg by urea/formaldehyde mole ratio, and reacting liquid temperature is grown steadily after 90 ℃, be incubated 15 minutes.
B. regulating pH value with 10% formic acid and reach 4.8～5.0, continue to be incubated 30 minutes about 90 ℃, is 1: 2.11 by urea/formaldehyde mole ratio, adds second crowd of urea 1.4kg, and repeatedly measures the reaction end of urea-formaldehyde glue liquid.
C. after reaching reaction end, drip 20% caustic soda, make the glue pH value reach 7.5～8.0, when being cooled to 65～70 ℃, add the 3rd crowd of urea 17.89kg.Below 40 ℃, transfer pH value to reach 7.5～8.0 at 25 minutes postcooling of 50～60 ℃ of insulations, reaction finishes.
D. use before the glue and must transfer pH value, get the glue that uses in 3 to 4 hours, with the 20% ammonia chloride solution accent glue of getting, after stirring, make it be slightly acidic, pH value reaches the 6 urea-formaldehyde glue 80kg that promptly get low content of free aldehyde of the present invention.
E. for strengthening waterproof effect, can in the glue that takes out, add 2% trimeric cyanamide and 5% Sumstar 190.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067235 CN1621477A (en) | 2004-10-18 | 2004-10-18 | Urea-formaldehyde glue with low content of free aldehyde and its preparing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067235 CN1621477A (en) | 2004-10-18 | 2004-10-18 | Urea-formaldehyde glue with low content of free aldehyde and its preparing method |
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| Publication Number | Publication Date |
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| CN1621477A true CN1621477A (en) | 2005-06-01 |
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| CN 200410067235 Pending CN1621477A (en) | 2004-10-18 | 2004-10-18 | Urea-formaldehyde glue with low content of free aldehyde and its preparing method |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344720C (en) * | 2006-03-30 | 2007-10-24 | 浙江林学院 | Environment protection, low cost urea resin gel |
| CN100384899C (en) * | 2006-03-15 | 2008-04-30 | 北京林业大学 | Urea resin and production thereof |
| CN100408607C (en) * | 2005-12-25 | 2008-08-06 | 计震涛 | Urea-formaldehyde resin glue produced by making chlorate as catching agent and preparation method thereof |
| CN100577704C (en) * | 2007-08-07 | 2010-01-06 | 江苏大学 | Method for preparing oxidization starch modified urea-formaldehyde resin |
| CN101191043B (en) * | 2006-11-20 | 2011-03-16 | 兰州大学 | Method for preparing urea-formaldehyde resin adhesive |
| CN101191042B (en) * | 2006-11-20 | 2011-03-23 | 兰州大学 | Method for preparing urea-formaldehyde resin adhesive |
| CN101220251B (en) * | 2007-12-14 | 2011-05-04 | 华南理工大学 | Oxidized starch modified phenolic resin lumber adhesion agent, preparation method and application thereof |
| CN102250572A (en) * | 2011-06-17 | 2011-11-23 | 江苏赛奥生化有限公司 | Preparation method of oxidized pueraria starch adhesive |
| CN102408855A (en) * | 2011-07-18 | 2012-04-11 | 广西大学 | Urea formaldehyde resin adhesive for moisture-proof environment-friendly medium density fiberboard and production method as well as composite additives thereof |
| CN101575487B (en) * | 2009-05-05 | 2012-05-30 | 浙江林学院 | Alkali lignin oxidized starch modified urea-formaldehyde glue and production method thereof |
| CN101353270B (en) * | 2008-09-08 | 2012-07-25 | 中国海洋石油总公司 | Preparation of low aldehyde long-acting urea-formaldehyde slow release fertilizer |
| CN101928537B (en) * | 2009-11-02 | 2013-02-06 | 南宁市火炬新产品开发有限责任公司 | Environmental-friendly urea-formaldehyde resin adhesive and production method thereof |
| CN102994030A (en) * | 2012-11-29 | 2013-03-27 | 永港伟方（北京）科技股份有限公司 | Application of starch adhesive and preparation method of urea-formaldehyde resin adhesive |
| CN103030462A (en) * | 2012-12-12 | 2013-04-10 | 四川好时吉化工有限公司 | Water-soluble urea-formaldehyde glue and preparation method thereof as well as method for improving strength of water-soluble compound fertilizer granule by water-soluble urea-formaldehyde glue |
| CN103360559A (en) * | 2013-07-25 | 2013-10-23 | 南京市荣达树脂有限公司 | Modified urea-formaldehyde resin |
| CN103361014A (en) * | 2013-07-25 | 2013-10-23 | 南京市荣达树脂有限公司 | Preparation method of modified urea-formaldehyde resin |
| CN103468186A (en) * | 2013-10-09 | 2013-12-25 | 赤水市新生竹纤维板有限公司 | Bamboo fiber flakeboard adhesive and preparation method of bamboo fiber flakeboard adhesive |
| CN104762047A (en) * | 2015-03-30 | 2015-07-08 | 广西宾阳县荣良新材料科技有限公司 | Production method of moisture-proof modified urea resin adhesive |
| CN106078947A (en) * | 2016-06-26 | 2016-11-09 | 周荣 | A kind of modified urea-formaldehyde resin glue plywood preparation method |
| CN106833462A (en) * | 2016-12-28 | 2017-06-13 | 江苏建丰装饰纸有限公司 | Low mole prop0rtion urea formaldehyde glue and its synthesis technique |
| CN110724485A (en) * | 2019-11-06 | 2020-01-24 | 徐州盛安化工科技有限公司 | Urea-formaldehyde resin adhesive and preparation method thereof |
| CN111995974A (en) * | 2020-09-04 | 2020-11-27 | 广西诺信化工科技有限公司 | Preparation method of E0-grade urea-formaldehyde glue |
-
2004
- 2004-10-18 CN CN 200410067235 patent/CN1621477A/en active Pending
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100408607C (en) * | 2005-12-25 | 2008-08-06 | 计震涛 | Urea-formaldehyde resin glue produced by making chlorate as catching agent and preparation method thereof |
| CN100384899C (en) * | 2006-03-15 | 2008-04-30 | 北京林业大学 | Urea resin and production thereof |
| CN100344720C (en) * | 2006-03-30 | 2007-10-24 | 浙江林学院 | Environment protection, low cost urea resin gel |
| CN101191043B (en) * | 2006-11-20 | 2011-03-16 | 兰州大学 | Method for preparing urea-formaldehyde resin adhesive |
| CN101191042B (en) * | 2006-11-20 | 2011-03-23 | 兰州大学 | Method for preparing urea-formaldehyde resin adhesive |
| CN100577704C (en) * | 2007-08-07 | 2010-01-06 | 江苏大学 | Method for preparing oxidization starch modified urea-formaldehyde resin |
| CN101220251B (en) * | 2007-12-14 | 2011-05-04 | 华南理工大学 | Oxidized starch modified phenolic resin lumber adhesion agent, preparation method and application thereof |
| CN101353270B (en) * | 2008-09-08 | 2012-07-25 | 中国海洋石油总公司 | Preparation of low aldehyde long-acting urea-formaldehyde slow release fertilizer |
| CN101575487B (en) * | 2009-05-05 | 2012-05-30 | 浙江林学院 | Alkali lignin oxidized starch modified urea-formaldehyde glue and production method thereof |
| CN101928537B (en) * | 2009-11-02 | 2013-02-06 | 南宁市火炬新产品开发有限责任公司 | Environmental-friendly urea-formaldehyde resin adhesive and production method thereof |
| CN102250572A (en) * | 2011-06-17 | 2011-11-23 | 江苏赛奥生化有限公司 | Preparation method of oxidized pueraria starch adhesive |
| CN102408855A (en) * | 2011-07-18 | 2012-04-11 | 广西大学 | Urea formaldehyde resin adhesive for moisture-proof environment-friendly medium density fiberboard and production method as well as composite additives thereof |
| CN102994030A (en) * | 2012-11-29 | 2013-03-27 | 永港伟方（北京）科技股份有限公司 | Application of starch adhesive and preparation method of urea-formaldehyde resin adhesive |
| CN103030462A (en) * | 2012-12-12 | 2013-04-10 | 四川好时吉化工有限公司 | Water-soluble urea-formaldehyde glue and preparation method thereof as well as method for improving strength of water-soluble compound fertilizer granule by water-soluble urea-formaldehyde glue |
| CN103360559A (en) * | 2013-07-25 | 2013-10-23 | 南京市荣达树脂有限公司 | Modified urea-formaldehyde resin |
| CN103361014A (en) * | 2013-07-25 | 2013-10-23 | 南京市荣达树脂有限公司 | Preparation method of modified urea-formaldehyde resin |
| CN103361014B (en) * | 2013-07-25 | 2014-11-05 | 南京市荣达树脂有限公司 | Preparation method of modified urea-formaldehyde resin |
| CN103468186A (en) * | 2013-10-09 | 2013-12-25 | 赤水市新生竹纤维板有限公司 | Bamboo fiber flakeboard adhesive and preparation method of bamboo fiber flakeboard adhesive |
| CN104762047A (en) * | 2015-03-30 | 2015-07-08 | 广西宾阳县荣良新材料科技有限公司 | Production method of moisture-proof modified urea resin adhesive |
| CN104762047B (en) * | 2015-03-30 | 2017-06-23 | 广西宾阳县荣良新材料科技有限公司 | A kind of production method of the glutinous agent of moistureproof modified urea-formaldehyde resin glue |
| CN106078947A (en) * | 2016-06-26 | 2016-11-09 | 周荣 | A kind of modified urea-formaldehyde resin glue plywood preparation method |
| CN106833462A (en) * | 2016-12-28 | 2017-06-13 | 江苏建丰装饰纸有限公司 | Low mole prop0rtion urea formaldehyde glue and its synthesis technique |
| CN110724485A (en) * | 2019-11-06 | 2020-01-24 | 徐州盛安化工科技有限公司 | Urea-formaldehyde resin adhesive and preparation method thereof |
| CN111995974A (en) * | 2020-09-04 | 2020-11-27 | 广西诺信化工科技有限公司 | Preparation method of E0-grade urea-formaldehyde glue |
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