CN104139447A - Production process of modified urea-formaldehyde glue wheat straw board - Google Patents
Production process of modified urea-formaldehyde glue wheat straw board Download PDFInfo
- Publication number
- CN104139447A CN104139447A CN201310164561.0A CN201310164561A CN104139447A CN 104139447 A CN104139447 A CN 104139447A CN 201310164561 A CN201310164561 A CN 201310164561A CN 104139447 A CN104139447 A CN 104139447A
- Authority
- CN
- China
- Prior art keywords
- wheat straw
- modified urea
- formaldehyde glue
- urea
- 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
Abstract
The invention discloses a production process of a modified urea-formaldehyde glue wheat straw board. The production process comprises such steps as material preparation, preparation of modified urea-formaldehyde glue, glue mixing, laying prepressing and thermal pressing formation. The production process uses melamine, hydroxyl acrylate and polyvinyl alcohol as modifying agent to prepare the modified urea-formaldehyde glue; the urea-formaldehyde glue has good curing effect; through the key steps of controlling the thermal pressing temperature and time, a prepared artificial board can obviously reduce the release amount of formaldehyde to satisfy the environment-friendly requirement, and correspondingly improves the bonding strength; and the produced board has the characteristics of good machining performance and good water resistance.
Description
Technical field
The present invention relates to a kind of production technology of wheat straw board, be specifically related to a kind of production technology of modified urea-formaldehyde glue wheat straw board.
Background technology
At present, China is Wood-based Panel Production big country Ye Shi lumber consumption big country.Due to the excessive felling to forest for a long time and other various forms of vegetation deteriorations, cause China's soil erosion, the adverse consequences such as flood is frequent, sandstorm is serious, deterioration of the ecological environment.Meanwhile, China's timber comprehensive utilization ratio is lower, is only 60% left and right, and larger with the gap of World Developed Countries, developed country is generally 90～95%.Therefore, timber imbalance between supply and demand will become increasingly conspicuous, and save timber, development wood substitutes by the direction that is China's forestry industry long-run development.
As the agricultural crop straw of regenerated resources, resource is very abundant, and according to incompletely statistics, the annual various agricultural crop straw output of China is up to more than 600,000,000 tons, and wherein wheat straw and straw are about 4.2 hundred million tons, and cornstalk is about 1.3 hundred million tons, and other cereals are about 100,000,000 tons.If can utilize wherein l～2%, can produce approximately 600～1,200 ten thousand m
2wood-based plate.As can be seen here, development artificial board of straw is produced, and for reducing Wood cut, conserves forests, and preserves the ecological environment, and develops a circular economy and has very great meaning.
Secondly at present, the adhesive widely using in wood-based plate is mainly urea-formaldehyde resin adhesive, be synvaren and melmac, and these three kinds of adhesive are the serial glue of formaldehyde, and using the distinct issues of these several adhesive is the release of formaldehyde.Formaldehyde is to cause that the multiple disease of human body is as the root of tracheitis, asthma, dermatitis, even after length, causes malignant tumour time of contact.Wood-based plate deposit with use procedure in, because urea formaldehyde is to generate under acid condition, the free moisture that wood-based plate itself is contained and absorbing after certain moisture and some sour gas, can there is hydrolysis with this understanding and discharge formaldehyde in the curing resin of part, therefore, accelerate this hydrolysis process if solidify insufficient meeting.Although modified urea-formaldehyde resin has in recent years reduced the content of free formaldehyde, fail to take into account the mechanical property of sheet material.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of production technology that can significantly reduce burst size of methanal in sheet material and have the modified urea-formaldehyde glue wheat straw board of good physical behavior.
For solving the problems of the technologies described above, the technical scheme that Bian of the present invention uses is:
A production technology for modified urea-formaldehyde glue wheat straw board, comprises the following steps
(1) get the raw materials ready: choose granularity and account for 80～90% Wheat Straw at 1～1.5mm;
(2) modified urea-formaldehyde glue preparation: get concentration and be 37% formalin 100～150 weight portions and add in four-hole boiling flask, sodium hydroxide solution with 30% regulates pH value to 7～8, add after 20～30 weight portion urea and melamine 20 weight portions, at 90 DEG C of heating 30min;
Regulate pH value to 4～5 with formic acid again, at 90 DEG C, react 20～30min, then pH value is adjusted to 8～9 with 30% sodium hydroxide solution, add 20～30 weight portion urea and hydroxy acrylate emulsion 20 weight portions, after reaction 30min, be cooled to 70 DEG C, and regulate pH value to 6;
Be warming up to again 90 DEG C, add 20～30 weight portion urea and polyvinyl alcohol 20 weight portions, keep this temperature 30min, after vacuum dehydration, add active filler, stir 10～15min, in resin not till unity thing; Finally add 20% ammonium chloride solution and ammoniacal liquor, stir 10min, place 10～15min, make modified urea-formaldehyde glue;
(3) glue mixing: getting weight is the modified urea-formaldehyde glue of above-mentioned (2) Wheat Straw 10～20%, adds uniform stirring in the Wheat Straw of above-mentioned (1), and it is 10～15% that the Wheat Straw after glue mixing is dried to water content in 100～110 DEG C;
(4) paving prefabricating: the Wheat Straw raw material that above-mentioned (3) are stirred mats formation, it is for subsequent use to be pressed in advance slab;
(5) hot-forming: the slab after above-mentioned (4) precompressed is put in to hot press and carries out hot pressing, hot pressing temperature is that 200～240 DEG C, hot pressing time are that 10～20s/mm, hot pressing pressure are 5～10MPa;
(6) inspection: the sheet material of above-mentioned (5) is placed 3～5 days in natural environment, then carried out physical and mechanical property index test, goods are after the assay was approved carried out to cutting edge, sanding, grade, pack.
On the basis of such scheme, hot pressing temperature one district is that 210～220 DEG C, 2nd district are 220～230 DEG C, 230～240 DEG C, 3rd district, 200～210 DEG C, 4th district in above-mentioned steps (4).
Above-mentioned hydroxy acrylate emulsion is synthesized with semi-continuous process.
Compared with prior art, beneficial effect of the present invention is:
The present invention prepares modified urea-formaldehyde glue taking melamine, hydroxy acrylate and polyvinyl alcohol as modifier, urea-formaldehyde glue solidification effect is good, and by controlling the committed steps such as hot pressing temperature and time, the wood-based plate of preparation not only can obviously reduce the burst size of formaldehyde, reach the requirement of environmental protection, and bonding strength improved accordingly, the sheet material of producing has that machining property is good, the feature of water-tolerant.
Detailed description of the invention
Embodiment 1
A production technology for modified urea-formaldehyde glue wheat straw board, comprises the following steps:
(1) get the raw materials ready: choose granularity and account for 80～90% Wheat Straw at 1～1.5mm; (2) glue mixing: getting weight is the modified urea-formaldehyde glue of above-mentioned (1) Wheat Straw 20%, adds uniform stirring in the Wheat Straw of above-mentioned (1), and it is 10～15% that the Wheat Straw after glue mixing is dried to water content in 100～110 DEG C; (3) paving prefabricating: by the Wheat Straw of above-mentioned (2) mat formation, to be pressed in advance slab for subsequent use; (4) hot-forming: the slab after above-mentioned (3) precompressed is put in to hot press and carries out hot pressing, hot pressing temperature one district is that 210～220 DEG C, 2nd district are that 220～230 DEG C, 230～240 DEG C, 3rd district, 200～210 DEG C, 4th district, hot pressing time are that 20s/mm, hot pressing pressure are 10MPa; (5) inspection: the sheet material of above-mentioned (4) is placed 3 days in natural environment, then carried out physical and mechanical property index test, goods are after the assay was approved carried out to cutting edge, sanding, grade, pack.
Above-mentioned modified urea-formaldehyde glue compound method is: get concentration and be 37% formalin 100～150 weight portions and add in four-hole boiling flask, sodium hydroxide solution with 30% regulates pH value to 7～8, add after 20～30 weight portion urea and melamine 20 weight portions, at 90 DEG C of heating 30min; Regulate pH value to 4～5 with formic acid again, at 90 DEG C, react 20～30min, then pH value is adjusted to 8～9 with 30% sodium hydroxide solution, add 20～30 weight portion urea and hydroxy acrylate emulsion 20 weight portions, after reaction 30min, be cooled to 70 DEG C, and regulate pH value to 6; Be warming up to again 90 DEG C, add 20～30 weight portion urea and polyvinyl alcohol 20 weight portions, keep this temperature 30min, after vacuum dehydration, add active filler, stir 10～15min, in resin not till unity thing; Finally add 20% ammonium chloride solution and ammoniacal liquor, stir 10min, place 10～15min, make modified urea-formaldehyde glue.
The above-mentioned sheet material finished product making is tested by the drier method of GB18580-2001 " in indoor decorating and refurnishing materials and goods thereof, formaldehyde discharges limitation " regulation, and burst size of methanal test result is in table 1.
Carry out the detection of the projects such as production board density D, moisture content MC, internal bond strength IB, MOR MOR, thickness swelling rate (TS/2hr) by standard GB/T/T 4897.1 ~ 4897-2003, testing result is in table 2 again.
Embodiment 2
A production technology for modified urea-formaldehyde glue wheat straw board, except the hot pressing temperature of step (4) is that 200～220 DEG C, hot pressing time are that 10s/mm, hot pressing pressure are 5MPa, all the other are same as embodiment 1.
The above-mentioned sheet material finished product making is tested by the drier method of GB18580-2001 " in indoor decorating and refurnishing materials and goods thereof, formaldehyde discharges limitation " regulation, and burst size of methanal test result is in table 1.
Carry out the detection of the projects such as production board density D, moisture content MC, internal bond strength IB, MOR MOR, thickness swelling rate (TS/2hr) by standard GB/T/T 4897.1 ~ 4897-2003, testing result is in table 2 again.
Embodiment 3
A production technology for modified urea-formaldehyde glue wheat straw board, except the hot pressing time of step (4) is that 15s/mm, hot pressing pressure are 8MPa, all the other are same as embodiment 1.
The above-mentioned sheet material finished product making is tested by the drier method of GB18580-2001 " in indoor decorating and refurnishing materials and goods thereof, formaldehyde discharges limitation " regulation, and burst size of methanal test result is in table 1.
Carry out the detection of the projects such as production board density D, moisture content MC, internal bond strength IB, MOR MOR, thickness swelling rate (TS/2hr) by standard GB/T/T 4897.1 ~ 4897-2003, testing result is in table 2 again.
Table 1 burst size of methanal test result
| ? | Burst size of methanal (mg/L) |
| Embodiment 1 | 1.12 |
| Embodiment 2 | 2.0 |
| Embodiment 3 | 1.60 |
The physical reason test result of table 2
| ? | Density (g/cm3) | Internal bond strength IB(MPa) | MOR MOR(MPa) | Thickness swelling rate (TS/2hr) |
| Embodiment 1 | 0.68 | 0.65 | 24.23 | 2.52 |
| Embodiment 2 | 0.60 | 0.50 | 25.65 | 3.31 |
| Embodiment 3 | 0.61 | 0.51 | 20.30 | 3.10 |
Claims (3)
1. a production technology for modified urea-formaldehyde glue wheat straw board, is characterized in that, comprises the following steps:
(1) get the raw materials ready: choose granularity and account for 80～90% Wheat Straw at 1～1.5mm;
(2) modified urea-formaldehyde glue preparation: get concentration and be 37% formalin 100～150 weight portions and add in four-hole boiling flask, sodium hydroxide solution with 30% regulates pH value to 7～8, add after 20～30 weight portion urea and melamine 20 weight portions, at 90 DEG C of heating 30min;
Regulate pH value to 4～5 with formic acid again, at 90 DEG C, react 20～30min, then pH value is adjusted to 8～9 with 30% sodium hydroxide solution, add 20～30 weight portion urea and hydroxy acrylate emulsion 20 weight portions, after reaction 30min, be cooled to 70 DEG C, and regulate pH value to 6;
Be warming up to again 90 DEG C, add 20～30 weight portion urea and polyvinyl alcohol 20 weight portions, keep this temperature 30min, after vacuum dehydration, add active filler, stir 10～15min, in resin not till unity thing;
Finally add 20% ammonium chloride solution and ammoniacal liquor, stir 10min, place 10～15min, make modified urea-formaldehyde glue;
(3) glue mixing: getting weight is the modified urea-formaldehyde glue of above-mentioned (2) Wheat Straw 10～20%, adds uniform stirring in the Wheat Straw of above-mentioned (1), and it is 10～15% that the Wheat Straw after glue mixing is dried to water content in 100～110 DEG C;
(4) paving prefabricating: the Wheat Straw raw material that above-mentioned (3) are stirred mats formation, it is for subsequent use to be pressed in advance slab;
(5) hot-forming: the slab after above-mentioned (4) precompressed is put in to hot press and carries out hot pressing, hot pressing temperature is that 200～240 DEG C, hot pressing time are that 10～20s/mm, hot pressing pressure are 5～10MPa;
(6) inspection: the sheet material of above-mentioned (5) is placed 3～5 days in natural environment, then carried out physical and mechanical property index test, goods are after the assay was approved carried out to cutting edge, sanding, grade, pack.
2. the production technology of a kind of modified urea-formaldehyde glue wheat straw board according to claim 1, is characterized in that: hot pressing temperature one district is that 210～220 DEG C, 2nd district are 220～230 DEG C, 230～240 DEG C, 3rd district, 200～210 DEG C, 4th district in described step (4).
3. the production technology of a kind of modified urea-formaldehyde glue wheat straw board according to claim 1, is characterized in that: described hydroxy acrylate emulsion is synthesized with semi-continuous process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310164561.0A CN104139447A (en) | 2013-05-07 | 2013-05-07 | Production process of modified urea-formaldehyde glue wheat straw board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310164561.0A CN104139447A (en) | 2013-05-07 | 2013-05-07 | Production process of modified urea-formaldehyde glue wheat straw board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104139447A true CN104139447A (en) | 2014-11-12 |
Family
ID=51848860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310164561.0A Pending CN104139447A (en) | 2013-05-07 | 2013-05-07 | Production process of modified urea-formaldehyde glue wheat straw board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104139447A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106675472A (en) * | 2016-12-17 | 2017-05-17 | 浦北县建业胶合板有限责任公司 | Urea-formaldehyde resin adhesive and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718661A (en) * | 2005-08-04 | 2006-01-11 | 上海应用技术学院 | Modified urea formaldehyde binding agent and its preparation method |
| CN101234505A (en) * | 2008-02-29 | 2008-08-06 | 上海大学 | Water-soluble polyalcohol, polyisocyanic acid ester and stalk fibrous composite material and preparation thereof |
| CN101265314A (en) * | 2008-04-30 | 2008-09-17 | 北京化工大学 | Environmental protection urea-formaldehyde resin and preparation method thereof |
| WO2008113181A1 (en) * | 2007-03-21 | 2008-09-25 | Alberta Research Council Inc. | Phyllosilicate clay modified resins for lignocellulosic fiber based composite panels |
| CN101791817A (en) * | 2010-02-05 | 2010-08-04 | 浙江省林业科学研究院 | Production method of environmental-friendly type low-cost middle and high density fiber board |
| CN102134468A (en) * | 2010-01-26 | 2011-07-27 | 北京建筑材料科学研究总院有限公司 | Method for preparing adhesive for grade-E0 medium density fiberboards |
| CN102604573A (en) * | 2012-01-12 | 2012-07-25 | 北华大学 | E0-grade melamine modified urea-formaldehyde resin adhesive, and preparation method and application thereof |
-
2013
- 2013-05-07 CN CN201310164561.0A patent/CN104139447A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718661A (en) * | 2005-08-04 | 2006-01-11 | 上海应用技术学院 | Modified urea formaldehyde binding agent and its preparation method |
| WO2008113181A1 (en) * | 2007-03-21 | 2008-09-25 | Alberta Research Council Inc. | Phyllosilicate clay modified resins for lignocellulosic fiber based composite panels |
| CN101234505A (en) * | 2008-02-29 | 2008-08-06 | 上海大学 | Water-soluble polyalcohol, polyisocyanic acid ester and stalk fibrous composite material and preparation thereof |
| CN101265314A (en) * | 2008-04-30 | 2008-09-17 | 北京化工大学 | Environmental protection urea-formaldehyde resin and preparation method thereof |
| CN102134468A (en) * | 2010-01-26 | 2011-07-27 | 北京建筑材料科学研究总院有限公司 | Method for preparing adhesive for grade-E0 medium density fiberboards |
| CN101791817A (en) * | 2010-02-05 | 2010-08-04 | 浙江省林业科学研究院 | Production method of environmental-friendly type low-cost middle and high density fiber board |
| CN102604573A (en) * | 2012-01-12 | 2012-07-25 | 北华大学 | E0-grade melamine modified urea-formaldehyde resin adhesive, and preparation method and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| 吴蓁等: "新型脲醛树脂胶黏剂的改性", 《化工进展》 * |
| 张伟: "6.1.1节-麦秸刨花板工艺流程", 《中国林业科学研究院-博士论文》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106675472A (en) * | 2016-12-17 | 2017-05-17 | 浦北县建业胶合板有限责任公司 | Urea-formaldehyde resin adhesive and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101058207B (en) | Maize stalk and/or wheat stalk composite board and its manufacturing method | |
| CN102179856B (en) | High-intensity shaving board and manufacturing method thereof | |
| CN105345911B (en) | Fire-retardant stalk-shaving board and its manufacture method | |
| CN104388043B (en) | Preparation method of soybean-protein-adhesive-based medium-density fiberboard | |
| CN102179857B (en) | High-strength fiberboard and manufacturing method thereof | |
| CN102218758B (en) | High-strength light plate material and manufacture method thereof | |
| CN102086361B (en) | High-efficiency extender for environmentally-friendly urea formaldehyde resin, and preparation and use thereof | |
| CN100575022C (en) | Bamboo matter medium density fibre board (MDF) | |
| CN105171883B (en) | A kind of manufacture method of bamboo and wood oriented wood chipboard used for bottom plate of container | |
| CN103031095A (en) | Adhesive for veneering of artificial board and preparation method of adhesive | |
| CN106313267A (en) | Straw recombination laminated wood and preparation method thereof | |
| CN103317586B (en) | A kind of Environment-friendlyglue glue free particle board and preparation method thereof | |
| CN107498681A (en) | Green stalk light wall board production method | |
| CN104087217A (en) | Method for preparing hydroxymethylated stalk ethanol byproduct and composite wood adhesive | |
| CN104946181A (en) | Preparation methods and application of low mole ratio UF resin adhesive and high mole ratio MUF resin adhesive | |
| CN105583935A (en) | Method for preparing environment-friendly fiberboard on basis of chitosan blended lignin | |
| CN100575021C (en) | The wooden medium density fibre board (MDF) of bamboo | |
| CN102225569B (en) | High-strength inorganic artificial board and manufacturing method thereof | |
| CN102501288A (en) | Method for preparing environment-friendly urea-formaldehyde resin adhesive particle plate of corn straw skins | |
| CN104404837A (en) | Environment-friendly medium-high-density fibreboard and production method thereof | |
| CN104057532A (en) | Manufacturing method for environmentally-friendly high-strength crop straw boards | |
| CN104139447A (en) | Production process of modified urea-formaldehyde glue wheat straw board | |
| CN104513640B (en) | The preparation method of urea formaldehyde glue | |
| CN104972545A (en) | Production technology for flame retarding straw artificial board | |
| CN106313258B (en) | Xylose residue prepares the process of plate |
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 |
Application publication date: 20141112 |