CN103484046B - Manufacturing method of low-formaldehyde-release-amount plywood - Google Patents
Manufacturing method of low-formaldehyde-release-amount plywood Download PDFInfo
- Publication number
- CN103484046B CN103484046B CN201310363768.0A CN201310363768A CN103484046B CN 103484046 B CN103484046 B CN 103484046B CN 201310363768 A CN201310363768 A CN 201310363768A CN 103484046 B CN103484046 B CN 103484046B
- Authority
- CN
- China
- Prior art keywords
- urea
- glued board
- formaldehyde resin
- solidifying agent
- quality
- 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.)
- Active
Links
Landscapes
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The embodiment of the invention provides a manufacturing method of a low-formaldehyde-release-amount plywood, belonging to the technical field of plywood preparation. The method comprises the step of adhesive application, wherein the amount of application of the adhesive is 6-8.5 wt% of absolutely dry plywood; the adhesive is composed of a modified urea-formaldehyde resin and a curing agent, and the curing agent accounts for 0.3-0.5 wt% of the modified urea-formaldehyde resin; the modified urea-formaldehyde resin is prepared from urea, glyoxal, melamine, borax and corn starch, and the urea:glyoxal:melamine mol ratio is 1:(0.8-1.1):(0.05-0.1); and the curing agent is composed of the following components in percentage by mass: 10.0-15.0% of ammonium chloride, 2.0-4.5% of hexamethylenetetramine, 0.3-0.8% of oxalic acid and the balance of water. The manufacturing method provided by the embodiment of the invention can control the formaldehyde release amount of the plywood at E0 grade or new E0 grade.
Description
Technical field
The invention belongs to technical field of plywood preparation, particularly a kind of manufacture method of glued board of low burst size of methanal.
Background technology
Custom plywood manufacturing process comprises log debarking, fracture, boiling, film-making, drying, applying glue, mats formation, precompressed, hot pressing, cooling, pile, cut, check and the operation such as packing.And need to add tackiness agent in applying glue operation in order to shrinking percentage problem and the problem of snappiness and poor water resistance existing complete processing when solving wood fibre solidification.Considering cost and glue performance in existing plywood production process are all that urea-formaldehyde resin makees tackiness agent substantially.In current used various urea-formaldehyde resin adhesives, all contain the composition of formaldehyde.Because formaldehyde is higher equitoxic material, China's noxious chemical priority acccess control list occupies second.Formaldehyde has been defined as carcinogenic and cause deformed material by the World Health Organization, be generally acknowledged allergen, is also one of potential strong mutagen; Meanwhile, timber itself also can produce a small amount of formaldehyde.In glued board, the release period of formaldehyde can reach 15-22, and the use of glued board and our daily life closely bound up, therefore solve the release And Spread of Solute of formaldehyde in glued board most important.
Summary of the invention
Embodiments provide a kind of manufacture method of glued board of low burst size of methanal, in the preparation process of glued board, have employed homemade tackiness agent, the use of this tackiness agent makes the burst size of methanal of glued board be in E
0level or super E
0grade standard.Described technical scheme is as follows:
Embodiments provide a kind of manufacture method of glued board of low burst size of methanal, this preparation method comprises applying glue operation, and in applying glue operation, the amount of application of tackiness agent is the 6-8.5% of glued board absolute dry mass.
Wherein, tackiness agent is made up of modified urea-formaldehyde resin and solidifying agent, and the quality of solidifying agent is the 0.3-0.5% of the quality of modified urea-formaldehyde resin;
Wherein, modified urea-formaldehyde resin by urea, oxalic dialdehyde, trimeric cyanamide, borax and W-Gum make, the mol ratio of urea, oxalic dialdehyde and trimeric cyanamide is 1:0.8-1.1:0.05-0.1, and the quality of W-Gum is the 1-5% of the quality of urea, and the quality of borax is the 1-4% of the quality of urea; Wherein, the composition of solidifying agent is counted with mass percentage: ammonium chloride 10.0-15.0%, vulkacit H 2.0-4.5%, oxalic acid 0.3-0.8%, all the other are water.
Wherein, the modified urea-formaldehyde resin in the embodiment of the present invention, except comprising these three kinds of main components of urea, oxalic dialdehyde and trimeric cyanamide, also comprises the auxiliary substance such as borax and W-Gum.Particularly, the oxalic dialdehyde in the embodiment of the present invention can working concentration be the glyoxal water solution of 40wt%, certainly uses the passable equally of other concentration.Further, the preparation method of the modified urea-formaldehyde resin in the embodiment of the present invention can be 201210229620.3(Environment-friendlyurea urea resin adhesive and preparation method thereof see application number) patent.In addition, in the modified urea-formaldehyde resin in the embodiment of the present invention oxalic dialdehyde usage quantity comparatively aforementioned patent lack a lot, accommodation has been done to other compositions simultaneously, the burst size of formaldehyde can to have been reduced further and the glue performance of sheet material can be met equally.
Wherein, the preparation method of the solidifying agent in the embodiment of the present invention is:
In water, ammonium chloride is added by proportioning, intensification adds vulkacit H by proportioning after being stirred to 38 DEG C-42 DEG C (being preferably 40 DEG C), cool to after isothermal reaction 18 minutes-24 minutes (being preferably 20 minutes) 20 DEG C-25 DEG C (being preferably 25 DEG C), then add oxalic acid by proportioning and be mixed to get solidifying agent.The solidifying agent that the embodiment of the present invention provides is cheap, convenient for production simple with use.This solidifying agent and aforesaid modified urea-formaldehyde resin have good Combination, arbitrarily applied amount can be adjusted as required in ratio range, effectively can also improve curing speed and the state of cure of modified urea-formaldehyde resin, and then improve the physical and mechanical property of glued board.
Wherein, the preparation of the glued board in the embodiment of the present invention adopts preparation principle and the preparation technology of normal plywood.Particularly, the preparation method of the glued board in the embodiment of the present invention is:
(1) film-making: timber (poplar or Liu An) is cut into slices on rotary tableting machine, the sun shines or on dryer, drying obtains the suitable thin slice of moisture;
(2) applying glue: previously prepared good modified urea-formaldehyde resin and solidifying agent are mixed to get tackiness agent, thin slice step (1) obtained again, through roller machine cloth glue (tackiness agent being applied to thin slice upper and lower surface), then mats formation into the number of plies (as 3 layers, 5 layers or 7 layers etc.) of the glued board of regulation;
(3) precompressed hot pressing: the glued board that step (2) is paved first through preformer precompressed 20 minutes, then through thermocompressor in certain temperature and pressure for some time;
(4) cooling packing: by the offset plate cooling of step (3) compression moulding, pile, cut into certain specification glued board both finished product.
The manufacture method of the glued board of the low burst size of methanal that the embodiment of the present invention provides, can control the burst size of methanal of glued board at E
0level or new E
0level (burst size of methanal≤0.3mg/L).First, it replaces by oxalic dialdehyde the formaldehyde amount of application that formaldehyde obviously can reduce glued board, and meanwhile, the use of this tackiness agent also can reduce the formaldehyde amount of application of timber itself.In addition, the adhesive component in the embodiment of the present invention is simple, cost is low, and produces simple, easy to use.Meanwhile, glued board prepared by the manufacture method of the glued board of the low burst size of methanal that the embodiment of the present invention provides, excellent physical properties (as bonding strength etc.) can meet the performance requriements of user to glued board.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.
Embodiment 1
One, the preparation of modified urea-formaldehyde resin, its preparation method is:
101, get urea 60Kg, 40wt% oxalic dialdehyde 145Kg, trimeric cyanamide 9Kg, W-Gum 2.5Kg joins in reactor successively, stirs, and temperature of reaction system is heated to 80 DEG C, condensing reflux 1.5h;
102, in step 101 reaction system, add borax 2Kg, then regulate this system pH to be 5.0 with NaOH, cooling discharging, the thick liquid obtaining faint yellow, non-irritating smell is modified urea-formaldehyde resin.
Two, the preparation of solidifying agent, its preparation method is:
Get 8.5Kg water, 1.2Kg ammonium chloride, 250g vulkacit H, 50g oxalic acid, in 8.5Kg water, add 1.2Kg ammonium chloride, heat up after being stirred to 40 DEG C and add 250g vulkacit H, isothermal reaction cooled to 25 DEG C after 20 minutes, add 50g oxalic acid again, be uniformly mixed and namely obtain solidifying agent.
Three, the preparation of tackiness agent, its preparation method is:
Before applying glue operation, aforementioned for the 100Kg modified urea-formaldehyde resin that obtains and the aforementioned solidifying agent obtained of 0.4Kg are uniformly mixed (proportioning 0.4%) and namely obtain tackiness agent.
Four, the preparation of glued board, its preparation method is:
201, film-making: poplar or Liu An are cut into slices on rotary tableting machine, the sun shines or on dryer, drying obtains the suitable thin slice of moisture;
202, applying glue: thin slice step 201 obtained again, through roller machine cloth glue (be applied to thin slice top layer by the aforementioned tackiness agent obtained, the amount of application of tackiness agent is the 6-8.5% of glued board absolute dry mass), then mats formation into the number of plies of the glued board of regulation;
203, precompressed hot pressing: the glued board that step 202 is paved first through preformer precompressed 20 minutes, then through thermocompressor in certain temperature and pressure for some time;
204, cooling packing: by the cooling of the offset plate of step 203 compression moulding, pile, cut into certain specification glued board both finished product.
Embodiment 2-9
In embodiment 2-9 the preparation method of glued board and the preparation method of embodiment 1 basically identical, difference is, in modified urea-formaldehyde resin, in the mol ratio difference (W-Gum is consistent with the adding proportion of borax) of urea, oxalic dialdehyde and trimeric cyanamide, solidifying agent, the proportioning of each material is different different with the resin added of tackiness agent in applying glue operation.In addition, in actual production process, in embodiment 2-9, conveniently calculating resin added to add man-hour, adopt the adhesive quality of unit surface to characterize resin added during applying glue operation, but the actual amount of application of tackiness agent is within the scope of the 6-8.5% of glued board absolute dry mass.
Table 1
| Sequence number | The mol ratio of urea, oxalic dialdehyde and trimeric cyanamide in resin | The mass percentage of ammonium chloride, vulkacit H, oxalic acid in solidifying agent | Resin added (g/m 2) | Solidifying agent accounts for resin (%) |
| 1 | 1：0.8：0.05 | 10.0%、2.0%、0.3% | 260 | 0.3 |
| 2 | 1：0.9：0:08 | 15.0%、4.0%、0.5% | 275 | 0.4 |
| 3 | 1：1：0.07 | 12.0%、4.5%、0.6% | 285 | 0.5 |
| 4 | 1：1.1：0.06 | 12.0%、3.0%、0.8% | 250 | 0.3 |
| 5 | 1：0.8：0.1 | 10.0%、2.5%、0.7% | 300 | 0.5 |
| 6 | 1：0.9：0.09 | 14.0%、3.5%、0.4% | 280 | 0.4 |
| 7 | 1：1：0.1 | 12.0%、2.0%、0.4% | 270 | 0.4 |
| 8 | 1：1.1：0.09 | 15.0%、4.0%、0.3% | 270 | 0.4 |
In table 1,2-4 item represents the mol ratio of urea in modified urea-formaldehyde resin, oxalic dialdehyde and trimeric cyanamide respectively, the mass percentage (surplus is water) of ammonium chloride, vulkacit H, oxalic acid in solidifying agent, the resin added of tackiness agent in applying glue operation, the consumption of solidifying agent in tackiness agent.
The detection data (measuring according to GB/T14732-2006) of the glued board obtained according to the operation of embodiment 1 and the proportioning of table 1 are as shown in table 2:
Table 2
| Sequence number | Burst size of methanal mg/L | Bonding strength MPa | Water ratio % |
| 1 | 0.03 | 0.75 | 7.8 |
| 2 | 0.03 | 0.81 | 8.1 |
| 3 | 0.04 | 0.78 | 8.3 |
| 4 | 0.02 | 0.73 | 7.5 |
| 5 | 0.04 | 0.75 | 8.5 |
| 6 | 0.03 | 0.74 | 8.4 |
| 7 | 0.02 | 0.75 | 8.3 |
| 8 | 0.03 | 0.77 | 8.2 |
As can be seen from Table 2, the burst size of methanal of the glued board that the present embodiment obtains is less than 0.04mg/L, and its burst size of methanal is less than 0.03mg/L in most cases, meets E
0level or new E
0grade standard.Meanwhile, the bonding strength of this glued board is greater than 0.7MPa, meets the physical and chemical performance requirement of user to glued board.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a manufacture method for the glued board of low burst size of methanal, comprises applying glue operation, and its characteristic is,
In applying glue operation, the amount of application of tackiness agent is the 6-8.5% of glued board absolute dry mass, and described tackiness agent is made up of modified urea-formaldehyde resin and solidifying agent, and the quality of described solidifying agent is the 0.3-0.5% of the quality of described modified urea-formaldehyde resin;
Described modified urea-formaldehyde resin by urea, oxalic dialdehyde, trimeric cyanamide, borax and W-Gum make, the mol ratio of described urea, oxalic dialdehyde and trimeric cyanamide is 1:0.8-1.1:0.05-0.1, the quality of described W-Gum is the 1-5% of the quality of described urea, and the quality of described borax is the 1-4% of the quality of described urea;
The composition of described solidifying agent is counted with mass percentage: ammonium chloride 10.0-15.0%, vulkacit H 2.0-4.5%, oxalic acid 0.3-0.8%, all the other are water.
2. manufacture method according to claim 1, is characterized in that, the preparation method of described solidifying agent is:
In water, add ammonium chloride by proportioning, heat up after being stirred to 38-42 DEG C and add vulkacit H by proportioning, cool to 20-25 DEG C after isothermal reaction 18-24 minute, then add oxalic acid by proportioning and be mixed to get described solidifying agent.
3. manufacture method according to claim 1 and 2, is characterized in that, the preparation method of described glued board is:
(1) film-making: timber is cut into slices on rotary tableting machine, the sun shines or on dryer, drying obtains the suitable thin slice of moisture;
(2) applying glue: described modified urea-formaldehyde resin and solidifying agent are mixed to get described tackiness agent, then by thin slice through roller machine cloth glue, then mat formation into the number of plies of the glued board of regulation;
(3) precompressed hot pressing: by the described glued board paved first through preformer precompressed, more namely obtain described glued board through thermocompressor compacting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310363768.0A CN103484046B (en) | 2013-08-20 | 2013-08-20 | Manufacturing method of low-formaldehyde-release-amount plywood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310363768.0A CN103484046B (en) | 2013-08-20 | 2013-08-20 | Manufacturing method of low-formaldehyde-release-amount plywood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103484046A CN103484046A (en) | 2014-01-01 |
| CN103484046B true CN103484046B (en) | 2014-12-31 |
Family
ID=49824659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310363768.0A Active CN103484046B (en) | 2013-08-20 | 2013-08-20 | Manufacturing method of low-formaldehyde-release-amount plywood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103484046B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104293260B (en) * | 2014-10-13 | 2016-06-15 | 湖北省宏源药业科技股份有限公司 | A kind of E0 level wood-based plate double-component modified urea-formaldehyde resin adhesive |
| CN105887557A (en) * | 2014-12-24 | 2016-08-24 | 天津元鸿科技有限公司 | Novel environmental protection impregnated paper |
| CN105131225A (en) * | 2015-10-19 | 2015-12-09 | 高大元 | Preparing method for urea resin modified by maize fermentation liquor |
| CN108130796A (en) * | 2017-12-25 | 2018-06-08 | 李建州 | A kind of energy preparation method of facing facing paper of purifying formaldehyde and facing facing paper |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY135503A (en) * | 2001-10-18 | 2008-04-30 | Akzo Nobel Nv | Method of gluing wood based materials |
| CN101306553B (en) * | 2008-06-27 | 2010-06-09 | 大亚科技股份有限公司 | Method for manufacturing low-oxymethylene-releasing high-density fibreboard |
| CN102838956A (en) * | 2012-07-04 | 2012-12-26 | 湖北省宏源药业有限公司 | Environment-friendly urea resin adhesive and preparation method thereof |
-
2013
- 2013-08-20 CN CN201310363768.0A patent/CN103484046B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103484046A (en) | 2014-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chen et al. | Effects of wood particle size and mixing ratios of HDPE on the properties of the composites | |
| CN103484046B (en) | Manufacturing method of low-formaldehyde-release-amount plywood | |
| CN102234493B (en) | Plant composite adhesive for man-made board and preparation method thereof | |
| CN101549519B (en) | Manufacturing method of high-moisture-proof and high-density fiber board | |
| CN102086361B (en) | High-efficiency extender for environmentally-friendly urea formaldehyde resin, and preparation and use thereof | |
| CN106336835B (en) | Single-component aldehyde-free adhesive for multilayer board and application thereof | |
| CN103045140B (en) | Low formaldehyde resin adhesive for decorative impregnating paper and preparation method thereof | |
| CN101200624A (en) | Lumber adhesive agent additives and preparation technique | |
| CN103072157B (en) | A kind of Ecological formaldehyde-flee core board | |
| CN106590523A (en) | Soybean-based formaldehyde-free adhesive and application methods thereof | |
| CN102443369B (en) | Timber adhesive and preparation method thereof | |
| CN108687902A (en) | A kind of anti-corrosive antibacterial medium density fibre board (MDF) and its manufacturing process | |
| CN103484045A (en) | Adhesive with ultralow formaldehyde release amount, and preparation method of same | |
| CN104742215B (en) | Medium density fiberboard produced by soybean protein adhesive and preparation method | |
| CN1994702A (en) | Medium density fiber board made from bamboo | |
| CN104212122B (en) | The additive of a kind of resol, preparation method and application | |
| CN107471392A (en) | A kind of particieboard of low burst size of methanal and preparation method thereof | |
| CN106003350A (en) | Preparation method and application of mildew preventive for artificial board | |
| CN105567142B (en) | A kind of high performance environment friendly urea-formaldehyde resin adhesive and preparation method thereof | |
| CN105295740A (en) | Aldehyde-free liquid glue and artificial board processing method | |
| CN104497937A (en) | Low-molar ratio modified adhesive for laminate flooring base material and preparation method thereof | |
| CN104118027A (en) | Environment-friendly moisture-proof medium-density fiberboard and manufacturing method thereof | |
| CN103540283A (en) | Urea-formaldehyde glue adhesive and preparation method thereof | |
| CN101792648B (en) | E1-grade urea-formaldehyde resin adhesive for medium density fiberboard generated by continuous rolling process and preparation method thereof and application thereof | |
| CN104513640B (en) | The preparation method of urea formaldehyde glue |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 438600 Fengshan City, Huanggang province Luotian County, north of the town of water Yi Road, No. 428 Patentee after: HUBEI HONGYUAN PHARMACEUTICAL TECHNOLOGY CO., LTD. Address before: 438600 Fengshan City, Huanggang province Luotian County, north of the town of water Yi Road, No. 428 Patentee before: Hubei Hongyuan Pharmaceutical Co., Ltd. |
|
| CB03 | Change of inventor or designer information |
Inventor after: Lv Zhiguo Inventor after: Duan Xiaoliu Inventor after: Xu Shuangxi Inventor after: Deng Zhihua Inventor after: Zhou Yongjun Inventor after: Jiang Zhiping Inventor before: Lv Zhiguo Inventor before: Duan Xiaoliu Inventor before: Xu Shuangxi Inventor before: Deng Zhihua Inventor before: Zhou Yongjun Inventor before: Jiang Zhiping |
|
| CB03 | Change of inventor or designer information |