CN1205342A - Improvement tech. of synthetizing urea-formaldehyde resin - Google Patents
Improvement tech. of synthetizing urea-formaldehyde resin Download PDFInfo
- Publication number
- CN1205342A CN1205342A CN 97105386 CN97105386A CN1205342A CN 1205342 A CN1205342 A CN 1205342A CN 97105386 CN97105386 CN 97105386 CN 97105386 A CN97105386 A CN 97105386A CN 1205342 A CN1205342 A CN 1205342A
- Authority
- CN
- China
- Prior art keywords
- urea
- reaction
- formaldehyde
- kilograms
- formaldehyde resin
- 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
Abstract
An improved process for synthesizing urea-formaldehyde resin features the two-step polycondensating reaction of urea and formaldehyde under the action of acid catalyst. The consumption of catalyst and the mole ratio of initial reacting substances are increased, so the polycondensating reaction is smoothly conducted by means of the heat generated by reaction itself, resulting in no need of external heater, short reaction period, less environmental pollution and high productivity.
Description
The present invention relates to a kind of improvement of synthetic resins processing method, specifically a kind of urea-formaldehyde resin synthetic improves technology.
Urea-formaldehyde resin is the polycondensate of urea and formaldehyde, has another name called aminoresin, electric cajaput fat, and the english abbreviation code name is UF.
The polycondensation of urea and formaldehyde is classical reaction, technical maturity (see " Chemical Manufacture flowchart illustrations " revise and enlarge two editions P378, Chemical Industry Press publishes in September, 1988).According to the data introduction, can also can finish in a step in polycondensation under the solutions of weak acidity in polycondensation under the weak basic condition, also can finish in two steps, the terminal point of reaction can be determined by the content of control PH or the free aldehyde of mensuration.But no matter adopt which kind of method, finishing this reaction process all needs indirect heating.Being controlled under 45 ℃ of conditions of having finished, and being controlled at more than 90 ℃ of having finished under the condition.In brief, promptly after will being preheating to certain temperature earlier behind the formaldehyde input reactor, drop into catalyzer and urea again.
In view of the polycondensation of urea and formaldehyde is that thermopositive reaction (is seen " applied chemistry handbook P406, Zhu Shaozhong, the big medium compiling of Deng, Science and Technology of Shanghai press in February, 1989 publishes), the present invention finishes polycondensation process with regard to utilizing this self reaction heat, is intended to realize improvements over the prior art.
The present invention is by strengthening catalyst consumption and reacting urine, the aldehyde mol ratio (hereinafter to be referred as urine aldehyde ratio) of starting stage and realize.Auspicious state as follows: will be a certain amount of formaldehyde then can throw acid catalyst after dropping into reactor, example hydrochloric acid, formic acid, acetic acid etc., its consumption is 1～5% of a formaldehyde amount, be twice above than prior art, drop into a part of urea in the calculated amount urea then, the control urine aldehyde ratio is more than 1: 2.5, and the urea that drops into for the first time in the existing two-step process, its urine aldehyde ratio is below 1: 2.0.The meeting of the temperature of system is risen rapidly after first urea adds, and control reaction temperature transfers PH to be slightly acidic below 60 ℃ after half an hour, drop into the urea of remainder at last, continues to react about half an hour, transfers PH to 7～8 promptly to get product UF.Described calculated amount urea is meant the urea amount that total as requested urine aldehyde ratio calculates.Because excess formaldehyde has the chain crosslinked effect mutually of the polycondensation of making, its crosslinking degree is determined by the different purposes of UF, that is to say that the total urine aldehyde ratio of reaction is not quite similar, and has 1: 1.2,1: 1.3, and 1: 1.4 ...
The present invention is rational Match in system with initial molar ratio of material and catalyst levels, be fully utilized self reaction heat makes polycondensation reach the requirement of industrial design, thereby with this traditional simplifying greatly with sophisticated technological process, realized revolutionary change, at first got rid of heating unit (as boiler, electric heating, electric heating wet goods), secondly also be reduced to 1～1.5 hour reaction time by common 3～5 hours.Although used a site catalyst, its comprehensive cost has still reduced significantly more, and labour productivity has also improved, and environmental pollution has also reduced.
Non-limiting examples is described below:
1, dropping into content in reactor is 150 kilograms of 37% industrial formols, stirs and drops into 1.5 kilograms in formic acid down, slowly drops into 45 kilograms in urea then, controlled temperature stirring reaction half an hour under 60 ℃ of conditions.Add alkali and transfer PH to 4～6, drop into 48 kilograms in remaining urea then, continue stirring reaction about half an hour, add alkali and transfer PH to 7～8, promptly obtain about 240 kilograms of even inclusion-free, appearance milky white thick liquid product UF.Temperature control realizes by the mode of rate of feeding and chuck water-cooled.Quality product meets the requirement of ZBG 39001-85 set quota.
Total urine aldehyde ratio is 1: 1.2 in the present embodiment, and initial urine aldehyde ratio is 1: 2.5.
2, get 150 kilograms of industrial formols, 4 kilograms of acetic acid, 85 kilograms in urea is initially thrown 37 kilograms, throws 48 kilograms at last.Operation is with embodiment 1, and temperature of reaction is controlled about 45 ℃.
Total urine aldehyde ratio is 1: 1.3 in the present embodiment, and initial urine aldehyde ratio is 1: 3.0.
3, get 150 kilograms of industrial formols, 6 kilograms of hydrochloric acid, 80 kilograms in urea is initially thrown 32 kilograms, throws 48 kilograms at last.Operation is with embodiment 1, and temperature of reaction is controlled at about 55 ℃.
Total urine aldehyde ratio is 1: 1.4 in the present embodiment, and initial urine aldehyde ratio is 1: 3.5.
4, get 150 kilograms of industrial formols, 1 kilogram in formic acid, acetic acid 2.5,4 kilograms of hydrochloric acid (mixed-acid catalyst adds up to 7.5 kilograms), 74 kilograms in urea is initially thrown 28 kilograms, throws 46 kilograms at last.Operation is with embodiment 1, and temperature of reaction is controlled at about 35 ℃.
Total urine aldehyde ratio is 1: 1.5 in the present embodiment, and initial urine aldehyde ratio is 1: 4.0.
Claims (1)
1, a kind of urea-formaldehyde resin synthetic improves technology, and two steps under the acid catalyst effect are carried out polycondensation by urea and formaldehyde, it is characterized in that:
(1), at first drop into formaldehyde and acid catalyst in still, catalyst levels is 1～5% of a formaldehyde;
(2), then slowly drop into first urea, its urine aldehyde mol ratio is more than 1: 2.5, and controlled temperature is in below 60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97105386 CN1205342A (en) | 1997-07-15 | 1997-07-15 | Improvement tech. of synthetizing urea-formaldehyde resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97105386 CN1205342A (en) | 1997-07-15 | 1997-07-15 | Improvement tech. of synthetizing urea-formaldehyde resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1205342A true CN1205342A (en) | 1999-01-20 |
Family
ID=5167885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97105386 Pending CN1205342A (en) | 1997-07-15 | 1997-07-15 | Improvement tech. of synthetizing urea-formaldehyde resin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1205342A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245129B (en) * | 2008-04-01 | 2010-06-02 | 河北大学 | Method for producing urea formaldehyde condensate with self-temperature elevating |
-
1997
- 1997-07-15 CN CN 97105386 patent/CN1205342A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245129B (en) * | 2008-04-01 | 2010-06-02 | 河北大学 | Method for producing urea formaldehyde condensate with self-temperature elevating |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1271104C (en) | Low formaldehyde emission phenol-formaldehyde resin and method for manufacture thereof | |
| AP1391A (en) | Process for the manufacture of furfural. | |
| CN1054619C (en) | Process for preparing phenolic binder | |
| EP0253488A2 (en) | Water soluble phenolic resole-urea composition | |
| CN102993394B (en) | New process for producing methylated amino resin through multi-step etherification | |
| CN1205342A (en) | Improvement tech. of synthetizing urea-formaldehyde resin | |
| US4174310A (en) | Process for producing aqueous urea-formaldehyde | |
| CN101786995A (en) | Method for preparing granular hexamethylol melamine | |
| MY121123A (en) | Purification of recycled 1,3-propanediol during polyester preparation | |
| CN102448929A (en) | Process to prepare a chelating agent or precursor thereof using a cyanide salt | |
| US6284921B1 (en) | Method for preparing a fertilizer | |
| PL354401A1 (en) | Method for the continuous production of polybutylene terephthalate from terephthal acid and butane diole | |
| CN110372475A (en) | A kind of synthesis technology of Low acid high yield trimethylolpropane | |
| US2338637A (en) | Polyamine-aldehyde condensation product and its production | |
| CN1031131C (en) | Process for preparing 6-methoxy naphthyl aldehyde | |
| US4090999A (en) | Process for the production of urea-formaldehyde adhesives or resins and products obtained thereby | |
| CN101367905B (en) | Process for preparing butanol etherification benzene substituted melamine formaldehyde resin | |
| CN1539851A (en) | Technique for preparing quatemary ammonium type cationic starch through degradation method | |
| CN101429281B (en) | Charging method used in polyphenylene sulfide production | |
| CA1070889A (en) | Process for the production of urea-formaldehyde adhesives or resins and products obtained thereby | |
| CN1119365C (en) | Production method of keto-aldehyde resin | |
| JP3681244B2 (en) | Continuous production method of polyester | |
| CN1197879C (en) | Method for synthesizing CK-518 high-effective cationic starch | |
| CN101037395A (en) | Preparation method of 1,1-Cyclohexane diethyl acid mono amide | |
| CN86107846A (en) | The methyne urea precipitator method are removed the formaldehyde in the trade effluent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |