CN103031095A - Adhesive for veneering of artificial board and preparation method of adhesive - Google Patents
Adhesive for veneering of artificial board and preparation method of adhesive Download PDFInfo
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- CN103031095A CN103031095A CN2012105374524A CN201210537452A CN103031095A CN 103031095 A CN103031095 A CN 103031095A CN 2012105374524 A CN2012105374524 A CN 2012105374524A CN 201210537452 A CN201210537452 A CN 201210537452A CN 103031095 A CN103031095 A CN 103031095A
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Abstract
The invention relates to an adhesive for a veneering of an artificial board and a preparation method of the adhesive. The adhesive comprises the components in parts by weight: 200 parts of formaldehyde, 20-50 parts of a modifier, 110-140 parts of urea, 5-15 parts of tripolycyanamide, and 1-10 parts of a tackifier. By addition of appropriate parts of modifier, on the one hand, the high solid content adhesive can be prepared without dehydration, moisture brought to a base material during coating is reduced, permeation of the adhesive is reduced, and glue penetration is reduced. In addition, through addition of the modifier, the molar ratio of formaldehyde and urea in the polycondensation phase in the urea resin synthetic process can be greatly reduced, so that hydrophilic radicals in the resin structure are greatly decreased. Meanwhile, tripolycyanamide in appropriate parts is added to modify, so that the water-solubility of the adhesive is reduced, the hydrophobicity of the adhesive is enhanced, and glue penetration is beneficially reduced. The tackifier in appropriate parts is added to improve the initial adhesion of the adhesive and reduce malposition of a veneer on the base material, so that the product quality is improved.
Description
Technical field
The present invention relates to a kind of tackiness agent and preparation method thereof, particularly a kind of wood-based plate veneer belongs to the adhesive of artificial board field with sizing agent and preparation method thereof.
Background technology
Timber has special advantage in current four large materials, wet effect and heat-insulating sound-insulating effect are conciliate in the native texture of timber, color, moisture absorption, can bring many-sided comforts such as vision, the sense of hearing and sensation to people.In recent years, along with the pursuit of people to " green " living environment of nature, timber more and more is subject to liking of people.Yet, once over-exploitation and the unreasonable consumption of natural resource had been made timber resource shortage, supply falls short of demand becomes worldwide problem.Opened up wide prospect take fast growing wood, inferior material as the saving and substitution timber that emerges as of the wood processing industry of raw material, made great contributions to for relaxing the timber imbalance between supply and demand.But artificial laminin plate surface does not have texture, dull coloring, stiff, fully meeting the market requirement.
The secondary processing of wood-based plate can enlarge the use range of wood-based plate and improve use value, it is a kind of wood-based plate secondary processing trailing of top grade that veneer overlay is decorated, the imitative precious timber that namely utilizes the precious timber of texture beauty or make by artificial means becomes very thin veneer (being referred to as veneer) to be attached to the wood-based plate surface through slicing (or rotary-cut) and decorates.
At present, when artificial board enterprise was produced thick china, sizing agent commonly used had urea-formaldehyde resin adhesive, melamine-formaldehyde resin adhesive, polyvinyl acetate emulsion and chloroprene rubber.Most widely used is urea-formaldehyde resin adhesive, and it can the hot pressing veneer, the veneer of also can colding pressing, water-tolerant, low price.But urea-formaldehyde resin adhesive easily infiltration causes seep through, and tack is poor, and veneer sticks on the easily changing of the relative positions on the base material, in addition easily sticking pressing plate when the hot pressing veneer.
Summary of the invention
In order to overcome the deficiencies in the prior art, the technical problem to be solved in the present invention provide a kind ofly water-solublely reduce, hydrophobicity increases, osmosis reduces wood-based plate veneer is with sizing agent and preparation method thereof.
For reaching above-mentioned purpose, a kind of wood-based plate veneer of the present invention sizing agent contains the component of following weight part: 200 parts in formaldehyde, properties-correcting agent 20-50 part, urea 110-140 part, trimeric cyanamide 5-15 part, tackifier 1-10 part, wherein said formaldehyde are that mass concentration is 37% industrial formol.
Sizing agent of the present invention, wherein preferred properties-correcting agent be Paraformaldehyde 96, acetaldehyde, propionic aldehyde, butyraldehyde, oxalic dialdehyde, one or more of glutaraldehyde.
Sizing agent of the present invention, wherein preferred described tackifier are one or more in polyvinyl alcohol, Walocel MT 20.000PV, modified corn starch, the aqueous polyvinyl acetate emulsion.
The invention still further relates to the method for the above-mentioned sizing agent of preparation, may further comprise the steps:
1) in reactor, adds formaldehyde, transfer pH=9.0-11.0 with sodium hydroxide, then add first urea and properties-correcting agent, be warming up to 70-90 ℃, be incubated 60-120 minute;
2) then be cooled to 40 ℃, transfer pH=7.0-9.5 with sodium hydroxide solution, add second batch urea, then be warmed up to 75-95 ℃, be incubated 30-90 minute;
3) transfer pH to 3-6, react to viscosity: be coated with-4 glasss 19-23s(30 ℃);
4) transfer pH to 5-7, add the 3rd batch of urea, temperature is controlled at 80-90 ℃, reacts to viscosity: be coated with-4 glasss 23-27s(30 ℃);
5) transfer pH to 7.0-7.5, add the 4th batch of urea and trimeric cyanamide, 75-80 ℃ of temperature control is incubated 10-40 minute, cooling;
Add tackifier when 6) being cooled to 70 ℃, be incubated 30-60 minute, cooling;
7) be cooled to below 40 ℃, transfer pH=7.5-8.0, discharging;
Wherein, the urea amount that adds for first to fourth time is respectively 5-10%, 55-65%, 25-35%, the 0-15% of urea gross weight.
Method of the present invention, wherein the employed acid of preferred described accent pH is selected from one or more in sulfuric acid, hydrochloric acid, phosphoric acid and the formic acid.
Method of the present invention, wherein the employed alkali of preferred described accent pH is sodium hydroxide.
Used tackifier one or more in polyvinyl alcohol, Walocel MT 20.000PV, modified corn starch, the aqueous polyvinyl acetate emulsion preferably in the inventive method.
The advantage of the technology of the present invention is:
1, because the present invention has added the properties-correcting agent of approrpiate wts part, the tackiness agent that the height that can make in the condition of not dewatering on the one hand contains admittedly, be brought into the moisture in the base material when having reduced gluing, reduced the osmosis of tackiness agent, thereby reduced the generation of seep through, overcome simultaneously production cycle length, waste electricity, vapour equal energy source, reduced production cost; The in addition adding of properties-correcting agent, can greatly reduce the mol ratio of polycondensation phase formaldehyde and urea in the urea-formaldehyde resin building-up process, so that hydrophilic radical greatly reduces in the resin structure, approrpiate wts umber cyanurotriamide modified, so that the water-soluble of tackiness agent reduces, hydrophobicity increases, and also is conducive to reduce the generation of seep through.
2, another advantage of the present invention is, the tackifier of the approrpiate wts umber that adds under the prerequisite that guarantees bonding strength, can improve the tack of tackiness agent, reduce the changing of the relative positions of veneer on base material, improve the quality of products; In addition, tackifier are as a class macromolecular cpd, and perviousness is very poor, also can play the effect that prevents seep through.
Embodiment
Below in conjunction with embodiment and testing data, be described in more detail with other technical characterictic and advantage the present invention is above-mentioned.
Embodiment 1: the preparation of urea-formaldehyde resin 1
Composition of raw materials:
Concrete reactions steps is as follows:
1) in reactor, adds successively formaldehyde, transfer pH=9.0-11.0 with sodium hydroxide, then add acetaldehyde and first urea, be warming up to 70-90 ℃, be incubated 60-120 minute;
2) then be cooled to 40 ℃, transfer pH=7.0-9.5 with sodium hydroxide solution, add second batch urea, then be warmed up to 75-95 ℃, be incubated 30-90 minute;
3) transfer pH to 3-6, react to viscosity: be coated with-4 glasss 19s(30 ℃);
4) transfer pH to 5-7, add the 3rd batch of urea, temperature is controlled at 80-90 ℃, reacts to viscosity: be coated with-4 glasss 23s(30 ℃);
5) transfer pH to 7.0-7.5, add the 4th batch of urea and trimeric cyanamide, temperature is controlled at 75-80 ℃, is incubated 10-40 minute, cooling;
Add tackifier when 6) being cooled to 70 ℃, be incubated 30-60 minute, cooling;
7) be cooled to below 40 ℃, transfer pH=7.5-8.0, discharging.
Embodiment 2: the preparation of urea-formaldehyde resin 2
Composition of raw materials:
Concrete reactions steps is as follows:
1) in reactor, adds successively formaldehyde, transfer pH=9.0-11.0 with sodium hydroxide, then add butyraldehyde and first urea, be warming up to 70-90 ℃, be incubated 60-120 minute;
2) then be cooled to 40 ℃, transfer pH=7.0-9.5 with sodium hydroxide solution, add second batch urea, then be warmed up to 75-95 ℃, be incubated 30-90 minute;
3) transfer pH to 3-6, react to viscosity: be coated with-4 glasss 20s(30 ℃);
4) transfer pH to 5-7, add the 3rd batch of urea, temperature is controlled at 80-90 ℃, reacts to viscosity: be coated with-4 glasss 24s(30 ℃);
5) transfer pH to 7.0-7.5, add the 4th batch of urea and trimeric cyanamide, temperature is controlled at 75-80 ℃, is incubated 10-40 minute, cooling;
Add tackifier when 6) being cooled to 70 ℃, be incubated 30-60 minute, cooling;
7) be cooled to below 40 ℃, transfer pH=7.5-8.0, discharging.
Embodiment 3: the preparation of urea-formaldehyde resin 3
Composition of raw materials:
Concrete reactions steps is as follows:
1) in reactor, adds successively formaldehyde, transfer pH=9.0-11.0 with sodium hydroxide, then add Paraformaldehyde 96 and first urea, be warming up to 70-90 ℃, be incubated 60-120 minute;
2) then be cooled to 40 ℃, transfer pH=7.0-9.5 with sodium hydroxide solution, add second batch urea, then be warmed up to 75-95 ℃, be incubated 30-90 minute;
3) transfer pH to 3-6, react to viscosity: be coated with-4 glasss 21s(30 ℃);
4) transfer pH to 5-7, add the 3rd batch of urea, temperature is controlled at 80-90 ℃, reacts to viscosity: be coated with-4 glasss 26s(30 ℃);
5) transfer pH to 7.0-7.5, add the 4th batch of urea and trimeric cyanamide, temperature is controlled at 75-80 ℃, is incubated 10-40 minute, cooling;
Add tackifier when 6) being cooled to 70 ℃, be incubated 30-60 minute, cooling;
7) be cooled to below 40 ℃, transfer pH=7.5-8.0, discharging.
Embodiment 4: the preparation of urea-formaldehyde resin 4
Composition of raw materials:
Concrete reactions steps is as follows:
1) in reactor, adds successively formaldehyde, transfer pH=9.0-11.0 with sodium hydroxide, then add Paraformaldehyde 96 and first urea, be warming up to 70-90 ℃, be incubated 60-120 minute;
2) then be cooled to 40 ℃, transfer pH=7.0-9.5 with sodium hydroxide solution, add second batch urea, then be warmed up to 75-95 ℃, be incubated 30-90 minute;
3) transfer pH to 3-6, react to viscosity: be coated with-4 glasss 23s(30 ℃);
4) transfer pH to 5-7, add the 3rd batch of urea, temperature is controlled at 80-90 ℃, reacts to viscosity: be coated with-4 glasss 27s(30 ℃);
5) transfer pH to 7.0-7.5, add the 4th batch of urea and trimeric cyanamide, temperature is controlled at 75-80 ℃, is incubated 10-40 minute, cooling;
Add tackifier when 6) being cooled to 70 ℃, be incubated 30-60 minute, cooling;
7) be cooled to below 40 ℃, transfer pH=7.5-8.0, discharging.
Reference examples:
Composition of raw materials:
Concrete reactions steps is as follows:
1) in reactor, adds formaldehyde, transfer pH=7.0-9.5 with sodium hydroxide solution, add first urea, then be warmed up to 75-95 ℃, be incubated 30 minutes;
2) transfer pH to 3-6, react to viscosity: be coated with-4 glasss 23s(30 ℃);
3) transfer pH to 5-7, add second batch urea, temperature is controlled at 80-90 ℃, reacts to viscosity: be coated with-4 glasss 27s(30 ℃);
4) transfer pH to 7.0-7.5, add the 3rd batch of urea, temperature is controlled at 75-80 ℃, is incubated 10-20 minute, cooling;
Add the 4th batch of urea when 5) being cooled to 70 ℃, be incubated 10-20 minute, cooling;
6) be cooled to below 40 ℃, transfer pH=7.5-8.0, discharging.
Test result
Utilize the embodiment of the invention 1 to embodiment 4 method to obtain the urea-formaldehyde resin adhesive that the wood-based plate veneer sticks with glue agent and the acquisition of comparative example method, according to the method among the GB/T 14074-2006 measure that consolidating of tackiness agent contains, the indexs such as pH, viscosity, set time, water-soluble, shelf lives, the result is as shown in the table:
| Numbering | Admittedly contain | pH | Viscosity | Set time | Water-soluble | Shelf lives |
| Embodiment 1 | 58.5% | 8.0 | 160cp | 78s | 0.6 | 30 days |
| Embodiment 2 | 65.2% | 7.8 | 210cp | 65s | 0.5 | 30 days |
| Embodiment 3 | 64.7% | 7.5 | 180cp | 54s | 0.7 | 30 days |
| Embodiment 4 | 63.2% | 7.5 | 220cp | 75s | 0.8 | 30 days |
| Reference examples | 48.4% | 7.7 | 120cp | 71s | 1.5 | 30 days |
As shown in Table 1, the solid content of embodiment 1 to 4 will be apparently higher than reference examples, simultaneously water-solublely will be worse than reference examples, and suitable with reference examples aspect set time and stability in storage.Therefore, under the prerequisite that satisfies glue performance and product stability, the present invention can significantly improve the perviousness of urea-formaldehyde resin adhesive, thereby reduces the generation (mainly having judged whether the seep through phenomenon by manual observation in the actual production) of seep through.
Test example
The wood-based plate veneer that utilizes the embodiment of the invention 1 to embodiment 4 method to obtain sticks with glue the urea-formaldehyde resin adhesive of agent and the acquisition of comparative example method and produces respectively 3 layers of glued board test specimen 1,2,3,4,5; Veneer is 5 years production fast-growing eucalyptus veneers, water ratio 8-12%;
The preparation of pre-pressing process condition and test specimen: Amount of spread 320g/m
2(two-sided), preload pressure 1-1.2MPa, squeeze time 30 minutes, assembly time 30 minutes;
According to GB 9846-2004, the slab that the suppresses solution of crouching is become standard specimen, measure the dried shape of slab with omnipotent mechanical test machine and shear Joint strength and bonding strength.
The mensuration of slab hot pressing and bonding strength:
Heat pressing process is: pressure 1.0-1.2MPa, and temperature is 105-115 ℃, the time is 4 minutes.
According to GB 9846-2004, the slab that the suppresses solution of crouching is become standard specimen, measure the bonding strength of slab with omnipotent mechanical test machine.Test result is as shown in the table:
| Numbering | The dried shape shearing resistance of slab after the precompressed | Glued board gummed intensity after the hot pressing |
| Embodiment 1 | 0.41 | 1.08 |
| Embodiment 2 | 0.42 | 1.21 |
| Embodiment 3 | 0.46 | 1.32 |
| Embodiment 4 | 0.49 | 1.15 |
| Reference examples | 0.21 | 0.84 |
As shown in Table 2, compare with reference examples, under the same conditions, the pre-Compressive Strength of embodiment 1 to 4 will significantly better than reference examples, illustrate that the tack of embodiment 1 to 4 is better than reference examples; In addition, the bonding strength after the hot pressing, the bonding strength of embodiment 1 to 4 also will be significantly better than reference examples.Sizing agent of the present invention has overcome the easy infiltration of existing urea-formaldehyde resin adhesive and has caused seep through, and tack is poor, and veneer sticks on the easily changing of the relative positions on the base material, easily glues the shortcomings such as pressing plate when the hot pressing veneer.
Above-described embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (6)
1. make plate veneer sizing agent for one kind, it is characterized in that, contain the component of following weight part: 200 parts in formaldehyde, properties-correcting agent 20-50 part, urea 110-140 part, trimeric cyanamide 5-15 part, tackifier 1-10 part, wherein said formaldehyde are that mass concentration is 37% industrial formol.
2. sizing agent according to claim 1 is characterized in that: described properties-correcting agent be Paraformaldehyde 96, acetaldehyde, propionic aldehyde, butyraldehyde, oxalic dialdehyde, one or more of glutaraldehyde.
3. sizing agent according to claim 1, it is characterized in that: described tackifier are one or more in polyvinyl alcohol, Walocel MT 20.000PV, modified corn starch, the aqueous polyvinyl acetate emulsion.
4. prepare the method for claim 1 or 2 described sizing agents, it is characterized in that, may further comprise the steps:
1) in reactor, adds formaldehyde, transfer pH=9.0-11.0 with sodium hydroxide, then add first urea and properties-correcting agent, be warming up to 70-90 ℃, be incubated 60-120 minute;
2) then be cooled to 40 ℃, transfer pH=7.0-9.5 with sodium hydroxide solution, add second batch urea, then be warmed up to 75-95 ℃, be incubated 30-90 minute;
3) transfer pH to 3-6, react to viscosity: be coated with-4 glasss 19-23s(30 ℃);
4) transfer pH to 5-7, add the 3rd batch of urea, temperature is controlled at 80-90 ℃, reacts to viscosity: be coated with-4 glasss 23-27s(30 ℃);
5) transfer pH to 7.0-7.5, add the 4th batch of urea and trimeric cyanamide, 75-80 ℃ of temperature control is incubated 10-40 minute, cooling;
Add tackifier when 6) being cooled to 70 ℃, be incubated 30-60 minute, cooling;
7) be cooled to below 40 ℃, transfer pH=7.5-8.0, discharging;
Wherein, the urea amount that adds for first to fourth time is respectively 5-10%, 55-65%, 25-35%, the 0-15% of urea gross weight.
5. method according to claim 4 is characterized in that: the employed acid of described accent pH is selected from one or more in sulfuric acid, hydrochloric acid, phosphoric acid and the formic acid.
6. method according to claim 4, it is characterized in that: the employed alkali of described accent pH is sodium hydroxide.
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| CN102555009A (en) * | 2012-02-20 | 2012-07-11 | 张国华 | High-strength environment-friendly shaving board |
| CN103540283A (en) * | 2013-10-18 | 2014-01-29 | 巫溪县迪纳木业有限公司 | Urea-formaldehyde glue adhesive and preparation method thereof |
| CN103555128A (en) * | 2013-10-25 | 2014-02-05 | 巫溪县迪纳木业有限公司 | Surface adhesive convenient for demolding templates |
| CN104449504A (en) * | 2014-11-28 | 2015-03-25 | 云南司珈尔木业股份有限公司 | Special glue for fiberboard processing and preparation method thereof |
| CN105131224A (en) * | 2015-08-24 | 2015-12-09 | 宋建平 | Glyoxal modified urea-melamine-formaldehyde resin adhesive and preparation method thereof |
| CN105585993A (en) * | 2016-03-11 | 2016-05-18 | 广西大学 | Method for preparing isobutyl aldehyde modified urea-formaldehyde resin adhesive |
| CN105623569A (en) * | 2014-11-07 | 2016-06-01 | 永港伟方（北京）科技股份有限公司 | Wood based panel cross-linkable starch modified urea formaldehyde resin adhesive and preparation method thereof |
| CN105666611A (en) * | 2016-01-29 | 2016-06-15 | 东营泰然材料科技股份有限公司 | Preparing method for fiberboard surface treating agent and application method of fiberboard surface treating agent |
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| CN107118723A (en) * | 2017-05-27 | 2017-09-01 | 江苏省江南新型复合研磨材料及制品工程技术研究中心有限公司 | A kind of emery cloth urea-formaldehyde adhesive and preparation method |
| CN107298957A (en) * | 2017-07-31 | 2017-10-27 | 安徽佳诺威木业有限公司 | A kind of preparation method of high-strength water-resistance urea-formaldehyde resin adhesive |
| CN107325766A (en) * | 2016-04-28 | 2017-11-07 | 大亚人造板集团有限公司 | The production technology of the low high moisture resistant chipboard adhesive of aldehyde and its application |
| CN107746694A (en) * | 2017-10-18 | 2018-03-02 | 岑溪市盛泰竹业科技有限公司 | Bonding agent for glued by bamboo sheet and preparation method thereof |
| CN108680462A (en) * | 2018-04-24 | 2018-10-19 | 天津大学 | Evaluation method for reaction end in water-soluble thiocarbamide urea formaldehyde building-up process |
| CN111303811A (en) * | 2020-04-07 | 2020-06-19 | 广州市长安粘胶制造有限公司 | Preparation method of waterproof soybean gum |
| CN115890839A (en) * | 2022-12-28 | 2023-04-04 | 中国林业科学研究院木材工业研究所 | Method for reducing glue application amount of polymeric isocyanate plywood |
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| CN102555009A (en) * | 2012-02-20 | 2012-07-11 | 张国华 | High-strength environment-friendly shaving board |
| CN103540283A (en) * | 2013-10-18 | 2014-01-29 | 巫溪县迪纳木业有限公司 | Urea-formaldehyde glue adhesive and preparation method thereof |
| CN103555128A (en) * | 2013-10-25 | 2014-02-05 | 巫溪县迪纳木业有限公司 | Surface adhesive convenient for demolding templates |
| CN103555128B (en) * | 2013-10-25 | 2015-11-11 | 巫溪县迪纳木业有限公司 | Be convenient to the face glue of the template demoulding |
| CN105623569B (en) * | 2014-11-07 | 2019-04-30 | 永港伟方（北京）科技股份有限公司 | A kind of wood-based plate cross-linking starch conversion urea-formaldehyde resin adhesive and preparation method thereof |
| CN105623569A (en) * | 2014-11-07 | 2016-06-01 | 永港伟方（北京）科技股份有限公司 | Wood based panel cross-linkable starch modified urea formaldehyde resin adhesive and preparation method thereof |
| CN104449504A (en) * | 2014-11-28 | 2015-03-25 | 云南司珈尔木业股份有限公司 | Special glue for fiberboard processing and preparation method thereof |
| CN105131224A (en) * | 2015-08-24 | 2015-12-09 | 宋建平 | Glyoxal modified urea-melamine-formaldehyde resin adhesive and preparation method thereof |
| CN105666611A (en) * | 2016-01-29 | 2016-06-15 | 东营泰然材料科技股份有限公司 | Preparing method for fiberboard surface treating agent and application method of fiberboard surface treating agent |
| CN105666611B (en) * | 2016-01-29 | 2018-02-27 | 东营泰然材料科技股份有限公司 | A kind of preparation method and application method of fibreboard surface inorganic agent |
| CN105585993A (en) * | 2016-03-11 | 2016-05-18 | 广西大学 | Method for preparing isobutyl aldehyde modified urea-formaldehyde resin adhesive |
| CN107325766A (en) * | 2016-04-28 | 2017-11-07 | 大亚人造板集团有限公司 | The production technology of the low high moisture resistant chipboard adhesive of aldehyde and its application |
| CN106497471A (en) * | 2016-10-28 | 2017-03-15 | 浙江欧仁新材料有限公司 | A kind of fire-retardant ultrasound fusion glue and preparation method thereof |
| CN107118723A (en) * | 2017-05-27 | 2017-09-01 | 江苏省江南新型复合研磨材料及制品工程技术研究中心有限公司 | A kind of emery cloth urea-formaldehyde adhesive and preparation method |
| CN107298957A (en) * | 2017-07-31 | 2017-10-27 | 安徽佳诺威木业有限公司 | A kind of preparation method of high-strength water-resistance urea-formaldehyde resin adhesive |
| CN107746694A (en) * | 2017-10-18 | 2018-03-02 | 岑溪市盛泰竹业科技有限公司 | Bonding agent for glued by bamboo sheet and preparation method thereof |
| CN108680462A (en) * | 2018-04-24 | 2018-10-19 | 天津大学 | Evaluation method for reaction end in water-soluble thiocarbamide urea formaldehyde building-up process |
| CN111303811A (en) * | 2020-04-07 | 2020-06-19 | 广州市长安粘胶制造有限公司 | Preparation method of waterproof soybean gum |
| CN115890839A (en) * | 2022-12-28 | 2023-04-04 | 中国林业科学研究院木材工业研究所 | Method for reducing glue application amount of polymeric isocyanate plywood |
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Application publication date: 20130410 |