CN102190770A - Production method for urea resin - Google Patents
Production method for urea resin Download PDFInfo
- Publication number
- CN102190770A CN102190770A CN201010124793XA CN201010124793A CN102190770A CN 102190770 A CN102190770 A CN 102190770A CN 201010124793X A CN201010124793X A CN 201010124793XA CN 201010124793 A CN201010124793 A CN 201010124793A CN 102190770 A CN102190770 A CN 102190770A
- Authority
- CN
- China
- Prior art keywords
- urea
- parts
- production method
- resin
- formaldehyde
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Phenolic Resins Or Amino Resins (AREA)
Abstract
The invention discloses a production method for urea resin. The product produced by the method is thermosetting resin. The urea resin is a main adhesive in the timber industry abroad and at home, and is widely applied due to a series of advantages of high bonding strength, quick curing, good operability, low production cost, rich and readily available raw materials, and the like. The urea resin is easy to cure; and the cured resin is colorless, and high in lightfastness, does not change color after long-term use, and does not change color in thermal forming, and is mainly used for products with low requirements on water resistance and dielectric property. The urea resin is prepared from the following raw materials: novel environment-friendly formaldehyde with the content of 38 percent, urea with the content of over 48 percent, polyvinyl alcohol, sodium hydroxide and ammonium chloride.
Description
Affiliated technical field:
Product of the present invention belongs to chemical field.
Background technology:
Urea-formaldehyde resin is the polymkeric substance that urea and formaldehyde reaction obtain.The production urea-formaldehyde resin is with low cost, and it is one of exploitation thermosetting resin early.But urea and the polycondensation under the catalysis of acid or alkali of content 38% formalin obtain linear urea aldehyde oligopolymer, and be industrial with alkali as a catalyst, reaction about 96 ℃, and the mol ratio of formaldehyde/urea is 1.8, to guarantee that resin can solidify.Generation one of the reaction the first step and dimethylolurea, methylol and amino further condensation obtain soluble resin, if the acid catalysis of using easily causes gel then.Urea-formaldehyde resin more easily solidifies, the shape that is translucent of the color of resin after the curing, and the hardness height, oil resistant, weak acid resistant, weak base, anti-mildew has good insulation and temperature tolerance, but weathering resistance and water tolerance are relatively poor, life-time service nondiscoloration, also nondiscoloration during thermoforming.Urea-formaldehyde resin is mainly used in water tolerance and the less demanding goods of dielectric properties, as wiring board, switch, machine handle, meter case, knob, daily necessities, ornament, mah-jong pieces, chamber pot lid; Because its look shallow and be easy to paintedly, goods often rich color are magnificent.Urea-formaldehyde resin also is the main binder of domestic and international timber industry. can make slurry, the thick china of sheet material, paper and fabric, the bonding of decorative panel for building, owing to series of advantages such as its bonding strength height, quick solidifying, good operability, abundant raw material are easy to get are used widely.But the contained free formaldehyde of urea-formaldehyde resin has toxicity, free formaldehyde content in the resin is low more, its toxicity is just more little. and the content that reduces free formaldehyde in the urea-formaldehyde resin has various way, wherein effective means is the consumption that reduces formaldehyde, but reduce the consumption of formaldehyde, will bring the urea-formaldehyde resin complex manufacturingization, so shortcomings such as resin solidification time lengthening and resinoid bond intensity and stability in storage reduction. must seek the method that the low formaldehyde of a kind of effective elimination brings disadvantage, this method is adjusted reinforced number of times exactly, feed molar ratio, the reinforced time, and optimum pH value in definite resin building-up process, temperature of reaction and reaction times, thus prepare low aldehyde contenting amount, the urea-formaldehyde resin of good stability.
Summary of the invention:
Urea-formaldehyde resin is a kind of of many uses, cheap, colourless, photostabilization good, the life-time service nondiscoloration, stability is resin preferably, and the technology of producing this resin is a lot, the invention provides a kind of technology, its beneficial effect is: by optimum reinforced number of times, feed molar ratio, reinforced time, and optimum pH value, temperature of reaction and reaction times in definite resin building-up process, thereby prepare the urea-formaldehyde resin of low aldehyde contenting amount, good stability.Producing the raw material that this resin uses has: content is 750 parts in 38% novel environment friendly formaldehyde; Content is greater than 230 parts in 48% urea; 12 parts of polyvinyl alcohol; 4 parts in sodium hydroxide; 4 parts of ammonium chlorides.
A kind of production method of urea-formaldehyde resin, its beneficial effect is: 1. cost is low, and environmental protection formaldehyde price is fully the same with commercially available common formaldehyde, and amount of urea is little; 2. environmental protection, this resin free formaldehyde content is very low; 3. production technique is simple.
Embodiment:
Embodiment:
The first step: in 750 parts of adding reactors of novel environment friendly formaldehyde, start agitator, the rotating speed of agitator is 35 rev/mins.Add 12 parts of polyvinyl alcohol, reacted 0.5 hour.
Second step: add 230 parts in urea, temperature is progressively risen to 96 ℃, reacted 1 hour.
The 3rd step: add 4 parts in sodium hydroxide, insulation reaction 0.5 hour.
The 4th step: after insulation reaction finishes, regulate about pH value to 7 with an amount of ammonium chloride.
The 5th step: after becoming glue, be cooled to 40 ℃, stop to stir, can obtain finished product by blowing.
Claims (6)
1. the production method of a urea-formaldehyde resin is characterized in that with content be 750 parts in 38% novel environment friendly formaldehyde; Content is greater than 230 parts in 48% urea; 12 parts of polyvinyl alcohol; 4 parts in sodium hydroxide; Ammonium chloride is raw material for 4 parts, by five steps
2. the production method of a kind of urea-formaldehyde resin according to claim 1, the feature of its first step is: in 750 parts of adding reactors of novel environment friendly formaldehyde, start agitator, the rotating speed of agitator is 35 rev/mins.Add 12 parts of polyvinyl alcohol, reacted 0.5 hour.
3. the production method of a kind of urea-formaldehyde resin according to claim 1, its feature of second one is: add 230 parts in urea, temperature is progressively risen to 96 ℃, reacted 1 hour.
4. the production method of a kind of urea-formaldehyde resin according to claim 1, the feature in its 3rd step is: add 4 parts in sodium hydroxide, insulation reaction 0.5 hour.
5. the production method of a kind of urea-formaldehyde resin according to claim 1, the feature in its 4th step is: after insulation reaction finishes, with about an amount of ammonium chloride adjusting pH value to 7.
6. the production method of a kind of urea-formaldehyde resin according to claim 1, the feature in its 5th step is: after becoming glue, be cooled to 40 ℃, stop to stir, can obtain finished product by blowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010124793XA CN102190770A (en) | 2010-03-11 | 2010-03-11 | Production method for urea resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010124793XA CN102190770A (en) | 2010-03-11 | 2010-03-11 | Production method for urea resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102190770A true CN102190770A (en) | 2011-09-21 |
Family
ID=44599713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010124793XA Pending CN102190770A (en) | 2010-03-11 | 2010-03-11 | Production method for urea resin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102190770A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172971A (en) * | 2013-03-27 | 2013-06-26 | 湖南福湘木业有限责任公司 | Urea formaldehyde resin for prepressing and synthesis technology thereof |
| CN104311766A (en) * | 2014-09-23 | 2015-01-28 | 黄厚生 | Synthetic process of novel environment-friendly urea formaldehyde resin |
| CN106008869A (en) * | 2016-06-28 | 2016-10-12 | 泸州金山林木业有限公司 | Formula and preparation method of carpentry board bonding compound |
| CN109695070A (en) * | 2018-12-04 | 2019-04-30 | 长春安旨科技有限公司 | A kind of high kiss-coating amount composite construction fiber of high intensity and preparation method thereof |
-
2010
- 2010-03-11 CN CN201010124793XA patent/CN102190770A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172971A (en) * | 2013-03-27 | 2013-06-26 | 湖南福湘木业有限责任公司 | Urea formaldehyde resin for prepressing and synthesis technology thereof |
| CN104311766A (en) * | 2014-09-23 | 2015-01-28 | 黄厚生 | Synthetic process of novel environment-friendly urea formaldehyde resin |
| CN106008869A (en) * | 2016-06-28 | 2016-10-12 | 泸州金山林木业有限公司 | Formula and preparation method of carpentry board bonding compound |
| CN106008869B (en) * | 2016-06-28 | 2018-09-11 | 泸州金山林木业有限公司 | A kind of formula and production method of woodwork plate adhesive glue |
| CN109695070A (en) * | 2018-12-04 | 2019-04-30 | 长春安旨科技有限公司 | A kind of high kiss-coating amount composite construction fiber of high intensity and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101565492B (en) | Low toxic and environment-friendly urea-formaldehyde resin and preparation method thereof | |
| CN106883366B (en) | A kind of E0Grade cyanurotriamide modified urea resin adhesive | |
| CN102604573A (en) | E0-grade melamine modified urea-formaldehyde resin adhesive, and preparation method and application thereof | |
| CN102604021B (en) | Method for synthesizing urea-formaldehyde resin containing micro free formaldehyde for E0-level artificial boards | |
| CN102190770A (en) | Production method for urea resin | |
| CN102229791A (en) | Environment-friendly type urea-formaldehyde resin adhesive and production method thereof | |
| CN102219885A (en) | Nano silicon oxide modified melamine formaldehyde resin and preparation method thereof | |
| CN102277001A (en) | Micro nanometer-enhanced wood plastic composite board and preparation method thereof | |
| CN101987881B (en) | Method for synthesizing urea-formaldehyde resin | |
| CN106118565A (en) | A kind of high-performance environment-friendly melamine resin adehsive and preparation method thereof | |
| CN100500723C (en) | Environment friendly quaternarily copolymerized thermosetting copolymer resin for high pressure laminated decorative board | |
| CN105585990A (en) | Production method of urea-formaldehyde resin/melamino formaldehyde resin adhesive | |
| CN101591867A (en) | Melamine modified urea-formaldehyde resin used for dipping paper of decorative laminated plate and preparation method thereof | |
| CN103319674B (en) | Preparation method for natural vegetable gum-modified urea-formaldehyde resin | |
| CN109867761B (en) | Wood adhesive resin and preparation method thereof | |
| CN104497937A (en) | Low-molar ratio modified adhesive for laminate flooring base material and preparation method thereof | |
| CN107603541B (en) | A kind of highly filled environmentally friendly condensation copolymerization resin wood adhesive and the preparation method and application thereof | |
| CN101274976B (en) | Preparation for multicomponent copolycondensation phenolic resin | |
| CN102190998A (en) | Method for producing melamine formaldehyde resin adhesives | |
| CN102190997A (en) | Method for producing urea formaldehyde resin adhesive | |
| CN105585993A (en) | Method for preparing isobutyl aldehyde modified urea-formaldehyde resin adhesive | |
| CN103709352A (en) | Synthesis technology of highly-methylated melamine resin | |
| CN103788909A (en) | Preparation method of adhesive for E0 environment-friendly shaving board | |
| CN102229696A (en) | Production method for phenol formaldehyde resin adhesive for bamboo recombined material | |
| CN105524240A (en) | Method for preparing urea-formaldehyde resin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110921 |