CN112207938A - Preparation method of modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board - Google Patents
Preparation method of modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board Download PDFInfo
- Publication number
- CN112207938A CN112207938A CN202010964155.2A CN202010964155A CN112207938A CN 112207938 A CN112207938 A CN 112207938A CN 202010964155 A CN202010964155 A CN 202010964155A CN 112207938 A CN112207938 A CN 112207938A
- Authority
- CN
- China
- Prior art keywords
- formaldehyde resin
- rice hull
- resin adhesive
- composite board
- urea
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/544—Silicon-containing compounds containing nitrogen
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention belongs to the technical field of wood plates, and aims to solve the problem of low cost performance of plate making caused by high density and high glue applying amount of the existing rice hull plate. The invention provides a method for manufacturing a low-density rice hull-wood shaving composite board. The rice hull wood shaving board has physical properties meeting market requirements at lower density, has higher economic benefit and is more beneficial to industrial production.
Description
Technical Field
The invention belongs to the technical field of timber boards, and particularly relates to a modified urea-formaldehyde resin adhesive low-density rice hull-wood composite material and a preparation method thereof.
Background
China is a big agricultural country, the rice yield is in the forefront of the world, and the rice yield still tends to increase at present. The rice hulls are the main remainder of rice processing, account for about 20% of the weight of rice, are abundant in source, but cannot be effectively utilized. Along with the coming of the national forest protection policy and the starting of natural forest protection engineering, wood is in more and more shortage, the contradiction between the supply quantity and the demand quantity of the wood is more and more prominent, and the manufacture of the shaving board by utilizing the crop residues and the rice hulls becomes a hot spot concerned by the wood processing industry. If the rice hulls can be used for manufacturing shaving boards, a large amount of wood can be saved, and the situation that the supply of the wood is tense is relieved. Although the research on the production of the rice hull shaving board by using the rice hulls as the raw materials has been carried out for decades and is put into production formally in the last 80 th century, the rice hulls have great differences from wood in the aspects of structure, form, chemical composition and the like, so that the quality of the rice hull shaving board is poor and is lower than that of a wood shaving board, and the main results are as follows: firstly, the physical and mechanical properties of the rice hull plate are poor; secondly, the glue consumption is large; high density. Therefore, the physical and mechanical properties of the rice hull plate are improved according to the structure, form and chemical characteristics of the rice hulls, and the method has great significance for effectively utilizing the rice hulls to manufacture the shaving board. However, the rice hulls have own particularity in the aspects of structure, form, chemical composition and the like, the rice hulls have short and small particles, and the interweaving and bonding degree of the particles is poor; the rice hulls are of a ladle-shaped structure, and the glue solution is difficult to permeate into the rice hulls, so that the phenomenon of local glue shortage is easily caused; the outer surface of the rice husk is covered with a smooth, compact and water-repellent silicon dioxide film, so that the rice husk is not easy to adsorb with glue solution, and the physical and mechanical properties of the board are adversely affected; the rice hulls have a substantial density of about 0.735g cm-3The bulk density is about 0.096 to 0.160 g/cm-3The average density of the wood shavings is less than 0.11-0.28 g-cm-3The slab is too thick and has poor compressibility when being paved. The physical and mechanical properties of the shaving board are closely related to the structure, form and chemical composition of the raw materials, the structural characteristics and chemical composition of the rice hulls determine that 100 percent of the physical and mechanical properties of the rice hull board are lower than those of a wooden shaving board, and the conventional board making tool is usedThe process is difficult to adapt.
Disclosure of Invention
The problem of low cost performance of the plate manufacturing caused by high density and high glue applying amount of the current rice hull plate is solved. The invention provides a method for manufacturing a low-density rice hull-wood shaving composite board, which enables a rice hull-wood shaving board to have physical properties meeting market requirements at a lower density, enables the rice hull-wood shaving board to have higher economic benefits and is more beneficial to industrial production.
The invention is realized by the following technical scheme: the preparation method of the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board comprises the following steps:
(1) washing, air-drying and crushing the rice hulls, and screening the crushed rice hulls through a screen with 8-20 meshes, wherein the size of the wood shavings is larger than 20 meshes;
the specific process is as follows: washing rice hulls with clear water for a plurality of times to remove solid impurities and dust, air-drying, grinding and crushing with a universal crusher, screening the crushed rice hulls through a screen with 8-20 meshes, and removing impurities such as fine powder, dust and the like when the wood shavings are larger than 20 meshes.
The wood shavings are prepared by chipping mixed wood residues, and the rice hulls are obtained by hulling rice produced in the same year. (2) Drying the mixture of the treated rice hull powder and wood shavings at the temperature of 100-105 ℃ to ensure that the water content is below 6%;
the mass ratio of the rice hull powder to the wood shavings is 1: 1-1.5.
Preferably, the drying is carried out at a temperature of 100 to 105 ℃ for a period of 24 hours or more.
(3) Adding an adhesive and a coupling agent into the dried mixture and stirring;
the addition amount of the adhesive is 7-9% of the mass of the mixture, and the adhesive is selected from urea-formaldehyde resin adhesive. Preferably, the urea-formaldehyde resin adhesive is prepared from urea-formaldehyde resin and a curing agent NH4Cl, and a curing agent is NH with the concentration of 25 percent4Aqueous solution of Cl, urea-formaldehyde resin and curing agent NH4The mass ratio of Cl is 1: 99-2: 98,
the liquid urea-formaldehyde resin adhesive (UF) has a solid content of 56%, a free formaldehyde content of less than 0.5%, and a viscosity of 28s (4 cups). The chemical surface treatment of the rice hulls can change the surface structure of the rice hulls to a certain extent, so that the rice hulls and the adhesive can generate a good gluing effect, but the labor cost, the post-treatment solution cost and the production cost are considered, the manufacturing cost of the plate can be undoubtedly greatly improved, the adhesive which can be well glued with the rice hulls is relatively selected to improve the gluing effect, the proper reduction of the density of the rice hull shaving board is a proper way for manufacturing the rice hull board with excellent performance, the cost can also be greatly reduced, the method is more suitable for industrial production, and the production of the rice hull board has economic feasibility.
The coupling agent is added in an amount of 2-3% by mass of the mixture, which increases the cost, and is selected from silane coupling agents, preferably KH550, KH560, KH570, more preferably KH-550, which are additives that improve the interfacial properties of synthetic resins and inorganic fillers in plastic compounding, also known as surface modifiers for inorganic fillers. The coupling agent molecule is generally composed of two parts: one part is hydrophobic group which can be compatible with the surface of the non-polar rice hull; and the other part is a hydrophilic group which can react with the synthetic resin. The rice hull and UF resin interface can be used to support a 'molecular bridge' through the use of coupling agent, and two materials with opposite interface properties are connected together, so as to improve the performance of the composite material. The coupling agent selected by the invention can well react with urea-formaldehyde resin which replaces isocyanate as an adhesive, and can react with silicon alcohol groups of silicon dioxide on the surface of rice hulls to form a very stable Si-O-Si bond, so that the silane coupling agent is used for well bridging the rice hulls and the urea-formaldehyde resin adhesive, the aim of replacing isocyanate with urea-formaldehyde resin with lower price is achieved, and the production cost is reduced.
Preferably, the mixture of the rice hulls and the wood shavings is placed into a glue mixer, a power supply is switched on, a vent valve is opened, the adhesive and the coupling agent are poured into the rubber tube at a constant speed until the mixture is uniformly stirred. The stirring time is less than 5 minutes, the material stirring time is proper, the stirring is insufficient when the stirring time is too short, and the urea-formaldehyde resin is slightly pre-cured in the stirring process due to heat generated by friction between materials when the stirring time is too long.
(4) Paving, and pressurizing and shaping the paved plate blank;
preferably, the paving is performed by hand paving according to the calculated paving amount. Setting pressure of 1.5-2Mpa for 1-2 min.
(5) And (3) performing hot pressing to obtain a plate, and standing at normal temperature to room temperature to obtain the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite plate.
Preferably, the hot pressing process is as follows: the hot pressing temperature is 150 ℃, the pressure is increased to 3-3.5MPa within 0.5-1min, the pressure is maintained for 1-2min, the pressure is reduced to 2-2.5MPa within 0.5-1min, the pressure is maintained for 1-2min, the pressure is reduced to 1-1.5MP within 0.5-1min, the pressure is maintained for 1-2min, and the pressure is reduced to 0MPa within 0.5-1 min.
The invention adopts the mixture of rice hulls and wood shavings as raw materials and urea resin modified by a coupling agent as an adhesive to prepare the low-density rice hull-wood composite material: the static bending strength is more than or equal to 11MPa, the internal bonding strength is more than or equal to 0.45MPa, the water absorption thickness expansion rate of 2h is less than or equal to 6 percent, the water content is less than or equal to 0.45 g.m < -3 >, and the water content is less than or equal to 7 percent, and all the performances meet the requirements of GB/T4897-.
The invention utilizes wood of leftover materials in industrial production, improves the utilization rate of the wood, can utilize a large amount of residual rice hulls in agriculture, reduces air pollution caused by burning the waste rice hulls, uses urea-formaldehyde resin modified by a coupling agent as an adhesive, reduces the cost by reducing the density and using the coupling agent to replace isocyanate under the condition of not influencing the physical performance of the plate, and has the formaldehyde emission of the plate of less than about 5.0mg/100 g. Therefore, the method is a new direction for the development of the plate from the viewpoint of environmental protection and performance. The invention has simple preparation, high production efficiency and easy processing, and is widely applied to various industries.
Compared with the prior art, the invention has the beneficial effects that: the prepared rice hull wood shaving board has physical properties meeting market requirements at lower density, so that the rice hull wood shaving board has higher economic benefit and is more beneficial to industrial production; the invention has simple preparation, high production efficiency and easy processing, and is widely applied to various industries.
Drawings
FIG. 1 is a graph showing the effect of the amount of coupling agent added on static bending strength;
FIG. 2 is a graph showing the effect of the amount of the coupling agent added on the water absorption thickness swelling ratio for 2 hours.
Detailed Description
The present invention will be described in further detail below with reference to examples and the accompanying drawings, in which the starting materials are commercially available or can be prepared by conventional methods.
Example 1
(1) Washing rice hulls with clear water for 1 time, removing solid impurities and dust, air-drying, grinding and crushing with a universal crusher, screening the crushed rice hulls through a 15-mesh screen, and removing impurities such as fine powder, dust and the like to obtain qualified raw materials, wherein the wood shavings have a size larger than 20 meshes;
(2) weighing the rice hull powder and the wood shavings in the step (1) according to the mass ratio of 1: 1, mixing, and putting into a dryer at 103 ℃ for drying for 30h to reduce the water content to 3%;
(3) firstly, urea-formaldehyde resin and NH with the mass concentration of 25 percent4Mixing Cl aqueous solution, urea-formaldehyde resin and curing agent NH4The mass ratio of Cl is 1: 99, and urea-formaldehyde resin glue is obtained;
putting the mixture of the rice hull and the wood shavings into a glue mixer, switching on a power supply, opening a vent valve, pouring the KH-550 coupling agent and the urea-formaldehyde resin glue into a rubber tube at a constant speed, wherein the addition amount of the coupling agent is 2.5 percent of the mass of the mixture, the addition amount of the urea-formaldehyde resin glue is 7 percent of the mass of the mixture, and stirring for 4 minutes and uniformly stirring.
(4) Manually laying a single-layer plate blank of 380mm multiplied by 360mm, pressing the pattern by a hot press, wherein the pre-pressing setting pressure is 1.5Mpa, and the pre-pressing time is 1 min;
(5) and (3) pressurizing to 3MPa within 0.5min at the hot pressing temperature of 150 ℃, keeping for 2min, reducing the pressure to 2MPa within 1min, keeping for 1min, reducing the pressure to 1MP within 0.5min, keeping for 2min, reducing the pressure to 0MPa within 1min, cooling the plate discharged from the hot press at room temperature, cutting edges of the cooled plate, and shaping to obtain the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite plate 1.
The density of the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board 1 is 0.45 g.m-3The thickness of the composite board is 10mm, and the product performance is shown in Table 1.
TABLE 1 comparison table of product performance and market index
Example 2
(1) Washing rice hulls with clear water for 2 times, removing solid impurities and dust, air-drying, grinding and crushing with a universal crusher, screening the crushed rice hulls through a 10-mesh screen, and removing fine powder, dust and other impurities to obtain qualified raw materials, wherein the size of wood shavings is larger than 22 meshes;
(2) weighing the rice hull powder and the wood shavings in the step (1) according to the mass ratio of 1: 1.2, and drying the mixture in a drier at 100 ℃ for 24 hours to reduce the water content to 5%;
(3) firstly, urea-formaldehyde resin and NH with the mass concentration of 25 percent4Mixing Cl aqueous solution, urea-formaldehyde resin and curing agent NH4The mass ratio of Cl is 2: 98, and urea-formaldehyde resin glue is obtained;
putting the mixture of the rice hull and the wood shavings into a glue mixer, switching on a power supply, opening a vent valve, pouring the KH-550 coupling agent and the urea-formaldehyde resin glue into a rubber tube at a constant speed, wherein the addition amount of the coupling agent is 3% of the mass of the mixture, the addition amount of the urea-formaldehyde resin glue is 8% of the mass of the mixture, and stirring for 4 minutes and uniformly stirring.
(4) Laying into 380mm × 360mm single-layer plate blank by hand, pressing the pattern with a hot press, and pre-pressing for 2min under the pressure of 1.5 MPa.
(5) And (3) pressurizing the board in sections at the temperature of 150 ℃, boosting the pressure to 3.5MPa within 0.5 minute, keeping the pressure for 1 minute, then reducing the pressure to 2.5MPa within 0.5 minute, keeping the pressure for 1 minute, reducing the pressure to 1.5MP within 0.5 minute, keeping the pressure for 1 minute, finally reducing the pressure to 0MPa within 0.5 minute, then cooling the board discharged from the hot press at room temperature, and trimming and shaping the cooled board to obtain the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board 2.
The density of the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board 2 is 0.5 g.m-3The thickness of the composite board is 15mm, and the product performance is shown in Table 2.
TABLE 2 comparison table of product performance and market index
Example 3
(1) Washing rice hulls with clear water for 3 times, removing solid impurities and dust, air-drying, grinding and crushing with a universal crusher, screening the crushed rice hulls through a 18-mesh screen, and removing impurities such as fine powder, dust and the like to obtain qualified raw materials, wherein the wood shavings have a size larger than 25 meshes;
(2) weighing the rice hull powder and the wood shavings in the step (1) according to the mass ratio of 1: 1.5, and drying in a drier at 105 ℃ for 27h to reduce the water content to 4%.
(3) Firstly, urea-formaldehyde resin and NH with the mass concentration of 25 percent4Mixing Cl aqueous solution, urea-formaldehyde resin and curing agent NH4The mass ratio of Cl is 1: 99, and urea-formaldehyde resin glue is obtained;
putting the mixture of the rice hull and the wood shavings into a glue mixer, switching on a power supply, opening a vent valve, pouring the KH-550 coupling agent and the urea-formaldehyde resin glue into a rubber tube at a constant speed, wherein the addition amount of the coupling agent is 2% of the mass of the mixture, the addition amount of the urea-formaldehyde resin glue is 9% of the mass of the mixture, and stirring for 4 minutes and stirring uniformly.
(4) The single-layer slabs are laid by hand into 380mm by 360mm single-layer slabs. Pressing the pattern by a hot press, wherein the pre-pressing setting pressure is 2MPa, and the pre-pressing time is 1 min.
(5) And (3) pressurizing in sections at the hot pressing temperature of 150 ℃, boosting the pressure to 3MPa within 1 minute, keeping for 1 minute, reducing the pressure to 2MPa within 1 minute, keeping for 1 minute, reducing the pressure to 1MP within 1 minute, keeping for 1 minute, reducing the pressure to 0MPa within 1 minute, cooling the plate discharged from the hot press at room temperature, cutting edges of the cooled plate, and shaping to obtain the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite plate 3.
Modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board 3 with density of 0.45 g.m-3The thickness of the composite board is 20mm, and the product performance is shown in Table 3.
TABLE 3 comparison table of product performance and market index
Comparative examples 1 to 4
The preparation is carried out according to the preparation steps of the example 1, the addition amounts of the coupling agent KH550 are respectively 0, 0.5, 1.0 and 1.5 percent of the mixture, and the rice hull-wood shaving composite boards 1-4 are respectively obtained.
The static bending strength of the rice hull-wood shaving composite boards 1 to 4 prepared in the comparative examples 1 to 4 and the low-density rice hull-wood shaving composite boards 1 to 3 prepared in the examples 1 to 3 of the modified urea-formaldehyde resin adhesive are shown in fig. 1, and the water absorption thickness expansion rate of 2 hours is shown in fig. 2. When the addition amount of the coupling agent is only 0.5%, the static bending strength and the 2h water absorption expansion rate performance of the composite board are greatly improved. The performance increase of the composite board is gradually slowed down along with the gradual increase of the addition amount of the coupling agent. In order to enhance the performance of the plate and increase the economic benefit, the addition amount of the coupling agent is proper, and the addition amount is 2.0-3.0%.
Although particular embodiments of the invention have been described and illustrated in detail, it should be understood that various equivalent changes and modifications could be made to the above-described embodiments in accordance with the spirit of the invention, and the resulting functional effects would still fall within the scope of the invention.
Claims (10)
1. The preparation method of the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board is characterized by comprising the following steps of:
(1) washing, air-drying and crushing the rice hulls, and screening the crushed rice hulls through a screen with 8-20 meshes, wherein the size of the wood shavings is larger than 20 meshes;
(2) drying the treated mixture of the rice hull powder and the wood shavings at the temperature of 100-105 ℃ to ensure that the water content is below 6%;
(3) adding an adhesive and a coupling agent into the dried mixture and stirring;
(4) paving, and pressurizing and shaping the paved plate blank;
(5) and (3) performing hot pressing to obtain a plate, and standing at normal temperature to room temperature to obtain the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite plate.
2. The preparation method of the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 1, wherein the mass ratio of the rice hull powder to the wood shavings in the step (2) is 1: 1-1.5.
3. The preparation method of the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 1, wherein the addition amount of the adhesive in the step (3) is 7-9% of the mass of the mixture.
4. The method for preparing the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 3, wherein the adhesive is selected from urea-formaldehyde resin adhesives.
5. The method for preparing the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 4, wherein the urea-formaldehyde resin adhesive is prepared from urea-formaldehyde resin and a curing agent NH4And mixing Cl.
6. The method for preparing the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 5, wherein the urea-formaldehyde resin and a curing agent NH are added4The mass ratio of Cl is 1: 99-2: 98.
7. the method for preparing the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 1, wherein the addition amount of the coupling agent in the step (3) is 2-3% of the mass of the mixture.
8. The method for preparing the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 7, wherein the coupling agent is selected from silane coupling agents.
9. The method for preparing the modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board according to claim 1, wherein in the step (4), the setting pressure is 1.5-2Mpa, and the setting time is 1-2 min.
10. The preparation method of the modified urea-formaldehyde resin adhesive low-density rice hull-wood shavings composite board as claimed in claim 1, wherein the hot pressing process in the step (5) is as follows: the hot pressing temperature is 150 ℃, the pressure is increased to 3-3.5MPa within 0.5-1min, the pressure is maintained for 1-2min, the pressure is reduced to 2-2.5MPa within 0.5-1min, the pressure is maintained for 1-2min, the pressure is reduced to 1-1.5MP within 0.5-1min, the pressure is maintained for 1-2min, and the pressure is reduced to 0MPa within 0.5-1 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964155.2A CN112207938A (en) | 2020-09-14 | 2020-09-14 | Preparation method of modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964155.2A CN112207938A (en) | 2020-09-14 | 2020-09-14 | Preparation method of modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112207938A true CN112207938A (en) | 2021-01-12 |
Family
ID=74049469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010964155.2A Pending CN112207938A (en) | 2020-09-14 | 2020-09-14 | Preparation method of modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112207938A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113103380A (en) * | 2021-04-13 | 2021-07-13 | 桃江县福丰木业有限公司 | Environment-friendly wood veneer not easy to crack and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6059994A (en) * | 1994-04-20 | 1995-11-02 | National Research Development Corporation | A process for producing composite particle boards from rice husks |
| CN101332621A (en) * | 2007-06-29 | 2008-12-31 | 何金辉 | Processing method of saw powder urea-formaldehyde composite materials |
| CN101579877A (en) * | 2009-05-27 | 2009-11-18 | 江苏福鑫木业有限公司 | High component rice hull and poplar tree branch shoot combined high density board production process |
| CN104690801A (en) * | 2015-02-27 | 2015-06-10 | 黑龙江省木材科学研究所 | Bamboo enhanced wood residue-rice hull multi-layer compound plate and preparation method thereof |
| CN104760111A (en) * | 2015-03-30 | 2015-07-08 | 广西宾阳县荣良新材料科技有限公司 | Anti-flaming chipboard and production method thereof |
-
2020
- 2020-09-14 CN CN202010964155.2A patent/CN112207938A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6059994A (en) * | 1994-04-20 | 1995-11-02 | National Research Development Corporation | A process for producing composite particle boards from rice husks |
| CN101332621A (en) * | 2007-06-29 | 2008-12-31 | 何金辉 | Processing method of saw powder urea-formaldehyde composite materials |
| CN101579877A (en) * | 2009-05-27 | 2009-11-18 | 江苏福鑫木业有限公司 | High component rice hull and poplar tree branch shoot combined high density board production process |
| CN104690801A (en) * | 2015-02-27 | 2015-06-10 | 黑龙江省木材科学研究所 | Bamboo enhanced wood residue-rice hull multi-layer compound plate and preparation method thereof |
| CN104760111A (en) * | 2015-03-30 | 2015-07-08 | 广西宾阳县荣良新材料科技有限公司 | Anti-flaming chipboard and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李兰亭: "《木材加工材料学》", 31 March 1992, 东北林业大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113103380A (en) * | 2021-04-13 | 2021-07-13 | 桃江县福丰木业有限公司 | Environment-friendly wood veneer not easy to crack and preparation method thereof |
| CN113103380B (en) * | 2021-04-13 | 2022-07-26 | 桃江县福丰木业有限公司 | Environment-friendly wood veneer not easy to crack and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101058207B (en) | Maize stalk and/or wheat stalk composite board and its manufacturing method | |
| CN101298379B (en) | Rubber-wood-cement composite material | |
| CN101407072B (en) | Production method for bulrush beaverboard | |
| CN110407533B (en) | Recycled aggregate permeable brick and preparation method thereof | |
| CN104388043B (en) | Preparation method of soybean-protein-adhesive-based medium-density fiberboard | |
| CN105128116A (en) | Formaldehyde-free-grade high-quality and high-density fiberboard and preparation method thereof | |
| CN105128117A (en) | Sun-protection high-density fiberboard based on ultraviolet shielding agent and preparation method of sun-protection high-density fiberboard | |
| WO2023284729A1 (en) | Biological formaldehyde-free adhesive, biological composite material and preparation method therefor | |
| CN105150343A (en) | High-density fiberboard with absorption performance enhanced by adding modified paper sludge and preparation method thereof | |
| CN1186419C (en) | Multifunctional carpentery stuffing and its compounding process | |
| CN112207938A (en) | Preparation method of modified urea-formaldehyde resin adhesive low-density rice hull-wood shaving composite board | |
| CN102181167B (en) | Amino mold reinforcement polyvinyl chloride (PVC) base wood plastics composite and preparation method thereof | |
| CN112322243B (en) | Waterproof polyamide-based adhesive and preparation method thereof | |
| CN105150344A (en) | Anti-crack anti-fracture straw substitute type high-density fiberboard and preparation method thereof | |
| CN105082297A (en) | Anti-abrasion and anti-static high-density environment-friendly fiber board and preparation method thereof | |
| CN105150346A (en) | Durable type high-density fiberboard capable of being used outdoors and preparation method thereof | |
| CN107443534B (en) | High-density board and preparation method thereof | |
| CN108587482A (en) | A kind of self-heating inorganic adhesive and preparation method thereof and its application process in inorganic artificial board production | |
| CN114833912A (en) | Straw composite board and manufacturing method thereof | |
| CN107337833A (en) | A kind of preparation method for mixing plastic-wood floor material | |
| CN100480209C (en) | Production method of nano composite board | |
| CN110863600A (en) | Bamboo laminated wood and straw composite board | |
| CN113896464B (en) | Method for preparing regenerated cement-based water-permeable pavement brick from organic artificial stone processing waste and waste rubber and plastic powder | |
| CN114634781B (en) | Modified odor-removing urea-formaldehyde adhesive, application thereof, particle board and preparation method thereof | |
| CN108587215B (en) | Carbon fiber composite wood and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210112 |
|
| RJ01 | Rejection of invention patent application after publication |