CN105348464A - Preparation method of environment-friendly modified urea-formaldehyde resin adhesive - Google Patents
Preparation method of environment-friendly modified urea-formaldehyde resin adhesive Download PDFInfo
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- CN105348464A CN105348464A CN201510951654.7A CN201510951654A CN105348464A CN 105348464 A CN105348464 A CN 105348464A CN 201510951654 A CN201510951654 A CN 201510951654A CN 105348464 A CN105348464 A CN 105348464A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/34—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds and acyclic or carbocyclic compounds
- C08G12/36—Ureas; Thioureas
- C08G12/38—Ureas; Thioureas and melamines
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
- C09J161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09J161/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C09J161/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Phenolic Resins Or Amino Resins (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a preparation method of an environment-friendly modified urea-formaldehyde resin adhesive. According to the preparation method, following raw materials are added in stages in parts by weight: 50-55 parts of a formaldehyde solution with mass percentage of 36.5%-37.2%, 2-5 parts of tripolycyanamide, 6-10 parts of urea for a first batch, 12-15 parts of urea for a second batch, 13-16 parts of urea for a third batch and 8-10 parts of urea for a fourth batch. The environment-friendly modified urea-formaldehyde resin adhesive has the advantages of low formaldehyde emission, good water resistance, small shrinkage, small brittleness, low probability of aging and high bonding strength.
Description
Technical field
The present invention relates to a kind of preparation method of environment-friendly modified urea-formaldehyde resin adhesive.
Background technology
Urea-formaldehyde resin is that urea and formaldehyde are under catalyst action, synthesized by addition-polycondensation, general employing " alkali-acid-alkali " synthesis technique, there is addition reaction in the basic conditions, acidic conditions be occur polycondensation, chemical combination forms initial stage urea-formaldehyde resin, and then under solidifying agent or promoter effect, forms insoluble, not molten thermosetting resin in latter stage.Urea-formaldehyde resin after solidification is of light color, to be creamy white or translucent, weak acid resistant, weak base, good insulation preformance, wear resistance is splendid, low price, it is the kind that in tackiness agent, consumption is maximum. particularly in the manufacture of the various wood-based plate of wood-processing industry, urea-formaldehyde resin and modified product thereof account for about 90% of the total consumption of tackiness agent.But, chance strong acid, highly basic easily decompose, weathering resistance is poor, just sticky poor, shrink greatly, fragility greatly, not water-fast, easily aging, the wood-based plate produced with urea-formaldehyde resin is manufacturing and is also existing in use procedure the problem of Form aldehyde release, there is certain harm to HUMAN HEALTH, therefore must carry out modification to it.At present, being badly in need of a kind of when ensureing that urea-formaldehyde resin adhesive production cost is suitable, developing low formaldehyde emission, water-tolerant, shrinking little, that fragility is little, not easily aging, consolidation strength is high urea-formaldehyde resin adhesive production technique.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of above prior art: provide one to develop low formaldehyde emission, water-tolerant, shrink little, fragility is little, the preparation method of the not easily environment-friendly modified urea-formaldehyde resin adhesive that aging, consolidation strength is high.
Technical solution of the present invention is as follows: a kind of preparation method of environment-friendly modified urea-formaldehyde resin adhesive, and the weight part that each stage adds each raw material is as follows:
Massfraction is formaldehyde solution 50-55 part of 36.5-37.2%;
Trimeric cyanamide 2-5 part;
First urea 6-10 part;
Second batch urea 12-15 part;
3rd batch of urea 13-16 part;
4th batch of urea 8-10 part;
Prepare as follows:
1) be that the formaldehyde solution of 36.5-37.2% drops in reactor by massfraction; Being adjusted to pH value is 5.8-6.3;
2) add first urea, be warmed up to 70-72 DEG C, insulation 20-25 minute, then be warmed up to 87-90 DEG C;
3) adjusted to ph is to 7.2-7.5, adds second batch urea and trimeric cyanamide, ensures that reactor temperature is at 85-88 DEG C in adition process;
4) at 85-88 DEG C, adjusted to ph, to 5.8-6.0, carries out a polycondensation, when be coated with at 25 DEG C-4 glasss detect viscosity reach 15-17 second time, cool to 78-80 DEG C;
5) carry out secondary polycondensation at 78-80 DEG C, when be coated with at 25 DEG C-4 glasss detect viscosity reach 25-30 second time, adjust pH is 7.5-8.0, and cools to 68-70 DEG C;
6) add the 3rd batch of urea, cool to 55-58 DEG C and be incubated 20-25 minute;
7) add the 4th batch of urea, cool to 40-45 DEG C, adjusted to ph is 8.0-8.6, cools to less than 35 DEG C blowings.
As preferably, the weight part that each stage adds each raw material is as follows:
Massfraction is the formaldehyde solution 52 parts of 36.5-37.2%;
Trimeric cyanamide 3 parts;
8 parts, first urea;
13 parts, second batch urea;
15 parts, the 3rd batch of urea;
9 parts, the 4th batch of urea.
The invention has the beneficial effects as follows: the urea-formaldehyde resin adhesive production technique that the invention provides a kind of low mole prop0rtion, low burst size of methanal, both safety and environmental protection, there is again high strength, enhanced water resistance energy, shrink little, fragility is little, not easily aging urea-formaldehyde resin adhesive, may be used for producing the artificial board such as medium density fibre board (MDF), shaving board, glued board; The present invention also has rational technology, simple, and cost is low, the feature that is applicable to suitability for industrialized production.
Embodiment
With specific embodiment, the present invention is described in further details below, but the present invention is not only confined to following specific embodiment.
Embodiment one
A preparation method for environment-friendly modified urea-formaldehyde resin adhesive, the weight part that each stage adds each raw material is as follows:
Massfraction is the formaldehyde solution 52 parts of 36.7;
Trimeric cyanamide 3 parts;
8 parts, first urea;
13 parts, second batch urea;
15 parts, the 3rd batch of urea;
9 parts, the 4th batch of urea.
Prepare as follows:
1) by massfraction be 36.7% formaldehyde solution drop in reactor; Being adjusted to pH value is 5.8-6.3;
2) add first urea, be warmed up to 70 DEG C, be incubated 20 minutes, then be warmed up to 87-90 DEG C;
3) adjusted to ph is to 7.2-7.5, adds second batch urea and trimeric cyanamide, ensures that reactor temperature is at 85-88 DEG C in adition process;
4) at 85-88 DEG C, adjusted to ph, to 5.8-6.0, carries out a polycondensation, when being coated with-4 glasss of detection viscosity and reaching 17 seconds at 25 DEG C, cools to 78-80 DEG C;
5) carry out secondary polycondensation at 78-80 DEG C, when being coated with-4 glasss of detection viscosity and reaching 25 seconds at 25 DEG C, adjust pH is 7.5-8.0, and cools to 68-70 DEG C;
6) add the 3rd batch of urea, cool to 55-58 DEG C and be incubated 20-25 minute;
7) add the 4th batch of urea, cool to 40-45 DEG C, adjusted to ph is 8.0-8.6, cools to less than 35 DEG C blowings.
Embodiment two
A preparation method for environment-friendly modified urea-formaldehyde resin adhesive, the weight part that each stage adds each raw material is as follows:
Massfraction is the formaldehyde solution 50 parts of 36.7%;
Trimeric cyanamide 5 parts;
9 parts, first urea;
12 parts, second batch urea;
15 parts, the 3rd batch of urea;
10 parts, the 4th batch of urea;
Prepare as follows:
1) by massfraction be 36.7% formaldehyde solution drop in reactor; Being adjusted to pH value is 5.8;
2) add first urea, be warmed up to 72 DEG C, be incubated 20 minutes, then be warmed up to 87 DEG C;
3) adjusted to ph is to 7.2-7.5, adds second batch urea and trimeric cyanamide, ensures that reactor temperature is at 85-88 DEG C in adition process;
4) at 85-88 DEG C, adjusted to ph, to 5.8-6.0, carries out a polycondensation, when being coated with-4 glasss of detection viscosity and reaching 17 seconds at 25 DEG C, cools to 78-80 DEG C;
5) carry out secondary polycondensation at 78-80 DEG C, when being coated with-4 glasss of detection viscosity and reaching 30 seconds at 25 DEG C, adjust pH is 7.5-8.0, and cools to 68-70 DEG C;
6) add the 3rd batch of urea, cool to 55-58 DEG C and be incubated 20-25 minute;
7) add the 4th batch of urea, cool to 40-45 DEG C, adjusted to ph is 8.0-8.6, cools to less than 35 DEG C blowings.
The artificial board formaldehyde burst size adopting the environment-friendly modified urea-formaldehyde resin adhesive of above-mentioned preparation to produce is quenched lower than 3mg/100g(and is followed the example of) or 0.3mg/L(condensed steam water).
Below be only that feature of the present invention implements example, scope is not constituted any limitation.The technical scheme that all employings exchange on an equal basis or equivalence is replaced and formed, all drops within rights protection scope of the present invention.
Claims (2)
1. a preparation method for environment-friendly modified urea-formaldehyde resin adhesive, is characterized in that: the weight part that each stage adds each raw material is as follows:
Massfraction is formaldehyde solution 50-55 part of 36.5-37.2%;
Trimeric cyanamide 2-5 part;
First urea 6-10 part;
Second batch urea 12-15 part;
3rd batch of urea 13-16 part;
4th batch of urea 8-10 part;
Prepare as follows:
1) be that the formaldehyde solution of 36.5-37.2% drops in reactor by massfraction; Being adjusted to pH value is 5.8-6.3;
2) add first urea, be warmed up to 70-72 DEG C, insulation 20-25 minute, then be warmed up to 87-90 DEG C;
3) adjusted to ph is to 7.2-7.5, adds second batch urea and trimeric cyanamide, ensures that reactor temperature is at 85-88 DEG C in adition process;
4) at 85-88 DEG C, adjusted to ph, to 5.8-6.0, carries out a polycondensation, when be coated with at 25 DEG C-4 glasss detect viscosity reach 15-17 second time, cool to 78-80 DEG C;
5) carry out secondary polycondensation at 78-80 DEG C, when be coated with at 25 DEG C-4 glasss detect viscosity reach 25-30 second time, adjust pH is 7.5-8.0, and cools to 68-70 DEG C;
6) add the 3rd batch of urea, cool to 55-58 DEG C and be incubated 20-25 minute;
7) add the 4th batch of urea, cool to 40-45 DEG C, adjusted to ph is 8.0-8.6, cools to less than 35 DEG C blowings.
2. the preparation method of environment-friendly modified urea-formaldehyde resin adhesive according to claim 1, is characterized in that: the weight part that each stage adds each raw material is as follows:
Massfraction is the formaldehyde solution 52 parts of 36.5-37.2%;
Trimeric cyanamide 3 parts;
8 parts, first urea;
13 parts, second batch urea;
15 parts, the 3rd batch of urea;
9 parts, the 4th batch of urea.
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| CN201510951654.7A CN105348464B (en) | 2015-12-20 | 2015-12-20 | The preparation method of environment-friendly modified urea-formaldehyde resin adhesive |
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| CN201510951654.7A CN105348464B (en) | 2015-12-20 | 2015-12-20 | The preparation method of environment-friendly modified urea-formaldehyde resin adhesive |
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| CN105348464B CN105348464B (en) | 2017-10-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363505A (en) * | 2020-04-22 | 2020-07-03 | 广西丰林木业集团股份有限公司 | Modified urea-formaldehyde resin adhesive for moisture-proof shaving board and preparation method thereof |
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| CN105348464B (en) | 2017-10-31 |
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Address after: 343100 Ji'an City, Jiangxi Province Economic and Technological Development Zone Jinggangshan Ji Tai Road No. 29 Applicant after: Jiangxi Oasis Environmental Protection new material Limited by Share Ltd Address before: 343100 Ji'an City, Jiangxi Province Economic and Technological Development Zone Jinggangshan Ji Tai Road No. 29 Applicant before: Jiangxi Lvzhou Artificial Board Co., Ltd. |
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Address after: 343100 No. 29 Jitai Road, Jinggangshan Economic and Technological Development Zone, Ji'an County, Ji'an City, Jiangxi Province Patentee after: Jiangxi Oasis Environmental Protection New Materials Co., Ltd. Address before: 343100 No. 29 Jitai Road, Jinggangshan Economic and Technological Development Zone, Ji'an City, Jiangxi Province Patentee before: Jiangxi Oasis Environmental Protection new material Limited by Share Ltd |