CN1461786A - Manufacturing method of environmental protection type urea-formaldehyde resin glue - Google Patents
Manufacturing method of environmental protection type urea-formaldehyde resin glue Download PDFInfo
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- CN1461786A CN1461786A CN 02121076 CN02121076A CN1461786A CN 1461786 A CN1461786 A CN 1461786A CN 02121076 CN02121076 CN 02121076 CN 02121076 A CN02121076 A CN 02121076A CN 1461786 A CN1461786 A CN 1461786A
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- urea
- protection type
- formaldehyde resin
- formaldehyde
- resin adhesive
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- Phenolic Resins Or Amino Resins (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
An environmental protection type urea-formaldehyde resin glue for shaving board, plywood, fibrous board, paper products, etc is prepared from urea, formaldehyde, and assistant through weak alkali-weak acid-weak alkali reactions. Its advantages are low content of free formaldehyde (lower than 0.1%), high adhesion and shear strength, and high resistance to water.
Description
The present invention relates to a kind of making method of environment protection type urea formaldehyde resin adhesive, belong to the tackiness agent of wood working, paper product and the required usefulness of fibre product.
Urea-formaldehyde resin adhesive is a kind of consolidation strength height, tackiness agent water-fast, heat-resisting, with low cost, be widely used in the bonding of various woodworks, paper product and other materials such as processing glued board, shaving board, flakeboard, core-board, fiberboard, straw board, its consumption accounts for 80% of the total glue consumption of timber industry.The urea-formaldehyde resin adhesive that adopts the traditional technology prescription to make, its professional level low, poor product quality, particularly free formaldehyde content are generally higher.The wood-based plate of manufacturing is as being used for furniture and interior decoration, just free formaldehyde can evaporate.The release period of formaldehyde reaches 3-15, can not vapor away fully in the 1-2 of finishing back, thereby cause formaldehyde in indoor air content to exceed standard for a long time, serious environment pollution, harm people's physical and mental health.
The object of the present invention is to provide a kind of making method of environment protection type urea formaldehyde resin adhesive, its content that reaches at the preceding topic decline low content of free formaldehyde that does not influence urea-formaldehyde resin storage period is lower than below 0.1%, have the bonding strength height, water resistance is good, the shearing resistance advantages of higher.
Purpose of the present invention can realize by following measure: a kind of making method of environment protection type urea formaldehyde resin adhesive, synthetic weak base-weak acid-weakly alkaline the reaction scheme that adopts of its resin, by the free formaldehyde in the mol ratio reduction tackiness agent that changes urea and formaldehyde, and add a spot of properties-correcting agent, pH value and temperature of reaction in the control reaction process, adjust resin structure, reduce the methylene aldehyde ehter bond in the resin, be lower than 0.1% urea-formaldehyde resin adhesive thereby prepare its free formaldehyde content.
The present invention is further described:
Embodiment is the environment protection type urea formaldehyde resin adhesive prescription: (weight, part)
Urea: 350 parts, 630 parts in formaldehyde, trimeric cyanamide: 10.5 parts, formic acid: an amount of, sodium hydroxide: an amount of, ammoniacal liquor: an amount of.
During production, formalin once all adds in the reactor in will filling a prescription, and adds first urea and trimeric cyanamide in the stirring, be warming up to 60 ℃, be incubated about 30 minutes, transfer pH value 8-8.5 with aqueous sodium hydroxide solution, temperature of reaction is controlled at 80 ℃-90 ℃, and the reaction times is 30-40 minute; Transferring pH value with aqueous formic acid is 4.5-5.5, adds second batch of urea, and temperature of reaction is controlled at 85 ℃-95 ℃, is incubated 40-60 minute; After this observe the variation of liquid viscosity in the still at any time.When reaction reaches certain cloud temperature, promptly reaction end is transferred P with ammoniacal liquor immediately
1H value 7-8 is this synthetic key at acidic phase.Phase III is vacuum hydro-extraction, after viscosity reaches certain requirement, stop dehydration, the still interior reaction temperature adds the 3rd batch of urea below 60 ℃, stirred 10-20 minute, dissolving postcooling blowing promptly makes free formaldehyde content and is lower than 0.1% environment protection type urea formaldehyde resin adhesive.Thereby reach purpose of the present invention.
The present invention adopts the mol ratio method that changes urea and formaldehyde to reduce the content of free formaldehyde in the urea-formaldehyde resin adhesive, the disposable adding of formalin, and urea divides three addings, helps reducing the content of free formaldehyde.It is big that the add-on of first urea is wanted, and is to wish that urea is higher with the mol ratio of formaldehyde at the beginning, helps the generation of dimethylolurea, improves cross-linking density, the bonding strength of increase sheet material.With a spot of trimeric cyanamide as properties-correcting agent and toughener, with the water tolerance that improves sheet material with reduce free formaldehyde.
Environment protection type urea formaldehyde resin adhesive produced according to the invention can reach following technical indicator:
Viscosity (S): 40-60
Free formaldehyde content:＜0.1%
PH value: 7-8
Solids content: 65 ± 2
Storage period (20 ℃): 60-80 days
Claims (3)
1. the making method of an environment protection type urea formaldehyde resin adhesive is characterized in that being made according to certain synthesis technique by urea, formaldehyde and a spot of auxiliary agent.Its prescription is (weight, part) urea: 350 parts, formaldehyde: 630 parts, and trimeric cyanamide: 10.5 parts, formic acid: an amount of, sodium hydroxide: an amount of, ammoniacal liquor: an amount of.
2. according to the making method of claims 1 described environment protection type urea formaldehyde resin adhesive, the synthesis technique that it is characterized in that it is to adopt weak base-weak acid-weakly alkaline reaction scheme.In the addition reaction stage, be under the effect of sodium hydroxide, formic acid, ammoniacal liquor, to control pH value.
3. according to the making method of claims 1 described environment protection type urea formaldehyde resin adhesive, it is characterized in that with a spot of trimeric cyanamide as properties-correcting agent and toughener.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121076 CN1461786A (en) | 2002-05-31 | 2002-05-31 | Manufacturing method of environmental protection type urea-formaldehyde resin glue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121076 CN1461786A (en) | 2002-05-31 | 2002-05-31 | Manufacturing method of environmental protection type urea-formaldehyde resin glue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1461786A true CN1461786A (en) | 2003-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 02121076 Pending CN1461786A (en) | 2002-05-31 | 2002-05-31 | Manufacturing method of environmental protection type urea-formaldehyde resin glue |
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| CN (1) | CN1461786A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434247C (en) * | 2005-04-19 | 2008-11-19 | 许国良 | Bamboo dust board and its manufacturing technology |
| CN100443532C (en) * | 2004-12-18 | 2008-12-17 | 陈天云 | Environment-friendly type plastic and production method thereof |
| CN101830023A (en) * | 2010-05-14 | 2010-09-15 | 程国凉 | Manufacture process of high-density bamboo chip plates |
| CN101260284B (en) * | 2007-03-17 | 2011-08-31 | 广西大学 | On-line control multi-still continuous production method for wood adhesive |
| CN102604575A (en) * | 2012-03-31 | 2012-07-25 | 黑龙江大学 | Modified urea formaldehyde adhesive and preparation method thereof |
| CN102604576A (en) * | 2012-03-31 | 2012-07-25 | 黑龙江大学 | Modified urea-formaldehyde glue and preparation method thereof |
| CN102977826A (en) * | 2012-12-04 | 2013-03-20 | 广西华峰林业集团股份有限公司 | E1 grade environment-friendly moisture-proof urea-formaldehyde resin adhesive for medium-density fiberboards |
| CN103820064A (en) * | 2014-03-18 | 2014-05-28 | 浙江红高梁木业有限公司 | Novel low-toxicity urea-formaldehyde adhesive for particle boards |
| CN104086730A (en) * | 2014-07-28 | 2014-10-08 | 广西大学 | Two-step method for preparing modified urea-formaldehyde glue for environment-friendly artificial board |
| CN104723629A (en) * | 2015-02-17 | 2015-06-24 | 中国林业科学研究院林产化学工业研究所 | Preparation method for phenolic foam sandwich board |
| CN104861133A (en) * | 2015-04-30 | 2015-08-26 | 浙江帝龙新材料股份有限公司 | Environment-friendly natural plant fragrance amino resin and preparation method thereof |
| CN104861134A (en) * | 2015-04-30 | 2015-08-26 | 浙江帝龙新材料股份有限公司 | Environment-friendly anti-abrasion amino resin and preparation method thereof |
| CN105479580A (en) * | 2015-11-18 | 2016-04-13 | 广西大学 | Eucalyptus routing fiber board and manufacturing method thereof |
-
2002
- 2002-05-31 CN CN 02121076 patent/CN1461786A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100443532C (en) * | 2004-12-18 | 2008-12-17 | 陈天云 | Environment-friendly type plastic and production method thereof |
| CN100434247C (en) * | 2005-04-19 | 2008-11-19 | 许国良 | Bamboo dust board and its manufacturing technology |
| CN101260284B (en) * | 2007-03-17 | 2011-08-31 | 广西大学 | On-line control multi-still continuous production method for wood adhesive |
| CN101830023A (en) * | 2010-05-14 | 2010-09-15 | 程国凉 | Manufacture process of high-density bamboo chip plates |
| CN102604575A (en) * | 2012-03-31 | 2012-07-25 | 黑龙江大学 | Modified urea formaldehyde adhesive and preparation method thereof |
| CN102604576A (en) * | 2012-03-31 | 2012-07-25 | 黑龙江大学 | Modified urea-formaldehyde glue and preparation method thereof |
| CN102604576B (en) * | 2012-03-31 | 2013-09-04 | 黑龙江大学 | Modified urea-formaldehyde glue and preparation method thereof |
| CN102977826A (en) * | 2012-12-04 | 2013-03-20 | 广西华峰林业集团股份有限公司 | E1 grade environment-friendly moisture-proof urea-formaldehyde resin adhesive for medium-density fiberboards |
| CN103820064A (en) * | 2014-03-18 | 2014-05-28 | 浙江红高梁木业有限公司 | Novel low-toxicity urea-formaldehyde adhesive for particle boards |
| CN104086730A (en) * | 2014-07-28 | 2014-10-08 | 广西大学 | Two-step method for preparing modified urea-formaldehyde glue for environment-friendly artificial board |
| CN104086730B (en) * | 2014-07-28 | 2016-04-27 | 广西大学 | Prepare the two-step approach of environment friendly artificial board modified urea-formaldehyde glue |
| CN104723629A (en) * | 2015-02-17 | 2015-06-24 | 中国林业科学研究院林产化学工业研究所 | Preparation method for phenolic foam sandwich board |
| CN104861133A (en) * | 2015-04-30 | 2015-08-26 | 浙江帝龙新材料股份有限公司 | Environment-friendly natural plant fragrance amino resin and preparation method thereof |
| CN104861134A (en) * | 2015-04-30 | 2015-08-26 | 浙江帝龙新材料股份有限公司 | Environment-friendly anti-abrasion amino resin and preparation method thereof |
| CN105479580A (en) * | 2015-11-18 | 2016-04-13 | 广西大学 | Eucalyptus routing fiber board and manufacturing method thereof |
| CN105479580B (en) * | 2015-11-18 | 2018-06-15 | 广西大学 | A kind of Eucalyptus engraves milling fiberboard and its manufacturing method |
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