CN115781831A - Isocyanate-containing formaldehyde-free shaving board and preparation method thereof - Google Patents
Isocyanate-containing formaldehyde-free shaving board and preparation method thereof Download PDFInfo
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- CN115781831A CN115781831A CN202211640101.6A CN202211640101A CN115781831A CN 115781831 A CN115781831 A CN 115781831A CN 202211640101 A CN202211640101 A CN 202211640101A CN 115781831 A CN115781831 A CN 115781831A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses an aldehyde-free shaving board containing isocyanate and a preparation method thereof, wherein the aldehyde-free shaving board comprises an upper surface layer, a lower surface layer, an upper secondary core layer and a lower secondary core layer, and a core layer, wherein the raw materials of the upper surface layer and the lower surface layer comprise 10-40 parts of vegetable protein adhesive, 1-5 parts of adhesive, 2-5 parts of waterproof agent, 5-10 parts of isocyanate adhesive, 2-5 parts of attapulgite and 0.5-1% of oxidant solution by mass concentration, and 1m of oxidant solution is produced to obtain the aldehyde-free shaving board 3 0.5-2 kg of shaving board oxidant solution; the upper and lower secondary core layer raw materials comprise isocyanate glue and account for 1 percent of the upper and lower secondary core layer raw materials; the core layer comprises 2-5 parts of a waterproof agent, 10-20 parts of an isocyanate adhesive, 1-5 parts of a curing agent and 0.5-2 parts of a release agent. The formaldehyde-free shaving board prepared by the method has no formaldehyde detected, has good mechanical index, and can be applied to the fields of furniture manufacture, building decoration materials and the like.
Description
Technical Field
The invention relates to the technical field of artificial boards, in particular to an aldehyde-free shaving board containing isocyanate and a preparation method thereof.
Background
Particle board, also called particle board and bagasse board, is a board made of wood leftover or other wood cellulose material particles through gluing and hot pressing, and the formed particle board after hot pressing generally comprises a core layer and a surface layer which are laminated in sequence. The shaving board has the advantages of uniform structure, good processability, good sound absorption and sound insulation functions and low production cost, so the shaving board is widely applied. The particle board is an important board in the artificial boards, compared with other boards, the particle board has the advantages of relatively less production investment, less energy consumption, low cost and low requirement on the quality of raw materials, and fast growing wood, recycled waste wood and some non-wood materials can be used as raw materials of the particle board, so the particle board has unique advantages in the development of the particle board industry in China with deficient wood resources.
The existing shaving board mainly has the following defects: (1) the static bending strength of the existing shaving board is low; (2) The internal bonding strength and the elastic modulus of the existing shaving board cannot be improved at the same time; (3) The existing production method of the shaving board has high water absorption thickness expansion rate and low wet parallel static bending strength, and can not meet the strength requirement in a wet state; (4) The existing production method of the shaving board has complex process method, parameters are not easy to control, and the obtained oriented shaving board has uneven thickness and larger thickness deviation; (5) The characteristics of the process flow are that the raw tree species used for the conventional production of the particle board contain various odors, and the procedures of high-temperature drying, sizing, closed conveying equipment and the like are adopted in the process, so that the peculiar smell in the particle board is difficult to remove. Wherein the sandwich layer sets up inside the shaving board, does not have the circulation of air and is difficult to volatilize away the peculiar smell, causes the long-term peculiar smell that exists of panel, influences comfort level and the health of house.
Along with the improvement of the requirements of consumers on the board and the stricter requirements of the relevant standards on the board material quantity, the demand and the use amount of the excellent-performance shaving board without formaldehyde addition are increased day by day, and the development of a new process for reducing the peculiar smell of the shaving board and improving the mechanical property of the shaving board has important significance on the development of the industry.
Disclosure of Invention
In order to solve the problems of the shaving board in the prior art, the invention aims to provide an aldehyde-free shaving board containing isocyanate and a preparation method thereof, so that the defects of high formaldehyde content and poor mechanical property of the existing shaving board are overcome.
The technical scheme adopted by the invention is as follows:
an aldehyde-free shaving board containing isocyanate comprises an upper surface layer, a lower surface layer, an upper secondary core layer, a lower secondary core layer and a core layer, wherein the upper surface layer and the lower surface layer comprise 10-40 parts of plant protein glue, 1-5 parts of adhesive, 2-5 parts of waterproof agent, 5-10 parts of isocyanate adhesive, 2-5 parts of attapulgite and 0.5-1% of oxidant solution by mass concentration to produce 1m of shaving board 3 0.5-2 kg of shaving board oxidant solution;
the upper and lower secondary core layer raw materials comprise isocyanate glue and account for 1 percent of the upper and lower secondary core layer raw materials;
the core layer comprises 2-5 parts of a waterproof agent, 10-20 parts of an isocyanate adhesive, 1-5 parts of a curing agent and 0.5-2 parts of a release agent.
In the specific embodiment of the invention, the mass of the upper and lower surface layer raw materials accounts for 50-60% of the total raw materials of the shaving board, and the mass of the upper and lower secondary core layer raw materials and the core layer raw materials accounts for 40-50% of the total raw materials of the plates of the shaving board, wherein the core layer raw materials account for 10-15%.
In the specific embodiment of the invention, the mass ratio of the upper and lower surface layer raw materials is 1:1, and the mass ratio of the upper and lower secondary core layer raw materials is 1:1.
In the specific implementation mode of the invention, in the raw materials of the upper surface layer and the lower surface layer, the adhesive is EVA emulsion and/or waterborne polyurethane adhesive;
the waterproof agent is selected from paraffin emulsion, organic silicon or fatty acid salt;
the oxidant is selected from potassium permanganate or peroxide.
In the specific embodiment of the invention, in the core layer raw material, the waterproof agent is selected from paraffin emulsion, organic silicon or fatty acid salts;
the curing agent is one selected from glyoxal, glutaraldehyde and aromatic organic acid anhydride;
the release agent is aqueous polysiloxane emulsion, epoxy resin or phenolic resin.
The components of the water-proofing agent in the upper surface layer, the lower surface layer and the core layer can be the same or different.
The invention also provides a preparation method of the formaldehyde-free shaving board, which comprises the following steps: (1) Respectively taking raw materials of an upper surface layer, a lower surface layer, an upper secondary core layer and a lower secondary core layer, and preparing glue;
(2) The upper surface layer raw material, the lower surface layer raw material, the upper secondary core layer raw material, the lower secondary core layer raw material and the core layer raw material are respectively glued, paved, pre-pressed and hot-pressed, and the inner core three-layer sliced sheets are directionally paved in a criss-cross mode.
The shaving board prepared by the invention has a five-layer oriented paving structure, and the inner core three-layer shaving boards are directionally paved in a criss-cross mode, so that the stability of the board structure is guaranteed, the shaving board has very good impact resistance and bending resistance, and the shaving board is handy when being used as furniture. In addition to the three-layer structure, the shaving board also comprises fine materials on the upper surface layer and the lower surface layer, home decoration can be carried out by pasting different patterns during production, each board has a very stable structure and an attractive appearance, and the shaving board can be directly used for manufacturing furniture without a series of procedures such as painting and the like, so that the formaldehyde risk caused by the forging of the furniture is avoided.
In the concrete embodiment of the invention, the glue amount of the core layer glue is 20-30% of that of the core layer wood shavings, the glue amount of the surface layer glue is 25-30% of that of the surface layer wood shavings, and the isocyanate glue accounts for 1% of the raw materials of the upper and lower secondary core layers.
In the embodiment of the invention, the viscosity of the glue is controlled to be 200-500mPa.s.
In a specific embodiment of the present invention, the pre-pressing conditions are: prepressing for 20-40 s at 20-35 ℃ and 3-4 MPa.
In a specific embodiment of the present invention, the hot pressing conditions are: the first section hot pressing temperature is 200-220 ℃, the pressure is 8-11 MPa, the hot pressing time is 5s/mm, the second section hot pressing temperature is 180-190 ℃, the pressure is 4-6 MPa, the hot pressing time is 10s/mm, the third section hot pressing temperature is 160-170 ℃, the pressure is 4-6 MPa, and the hot pressing time is 5s/mm.
Compared with the prior art, the invention has the following beneficial effects: the invention adopts specific raw materials and controls the process parameters in the production process, so that the obtained formaldehyde-free shaving board does not contain formaldehyde, has good mechanical property, is not easy to expand after absorbing water, has good moisture resistance, high elastic modulus and uniform thickness of the shaving board, and ensures the quality of the shaving board.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It should be understood that the experimental methods used in the following examples are all conventional methods unless otherwise specified, and that the materials, reagents, etc. used in the following examples are commercially available without otherwise specified.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, or article that comprises a listed element is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, step, method, or article.
All percentages used herein are weight percentages and all ratios described herein are mass ratios, unless otherwise indicated.
Example 1
The preparation method of the isocyanate-containing formaldehyde-free shaving board comprises the following steps:
1. preparing raw materials:
including upper and lower top layer, time sandwich layer, sandwich layer from top to bottom, upper and lower top layer comprises top layer glue and the wooden fine wood shavings in top layer that are located the top layer glue, the sandwich layer comprises sandwich layer glue and the wooden rough shavings of sandwich layer that are located the sandwich layer glue, and the time sandwich layer comprises isocyanate glue, wooden shavings.
The weight of the raw materials of the upper surface layer and the lower surface layer accounts for 60 percent of the total raw materials of the shaving board, the weight ratio of the raw materials of the upper surface layer to the raw materials of the lower surface layer is 1:1, the weight of the raw materials of the upper core layer to the weight of the lower core layer and the raw materials of the core layer account for 40 percent of the total raw materials of the shaving board according to the weight of the raw materials of the upper core layer and the lower core layer, wherein the weight ratio of the raw materials of the core layer accounts for 10 percent, and the weight ratio of the raw materials of the upper core layer to the raw materials of the lower core layer accounts for 1:1.
The glue application amount of the surface layer glue is 25 percent of that of the surface layer wood shavings, the raw materials of the surface layer glue comprise 10 parts of vegetable protein glue, 1 part of waterborne polyurethane adhesive, 2 parts of waterproof agent paraffin emulsion, 5 parts of isocyanate (MDI) adhesive, 2 parts of attapulgite and a proper amount of potassium permanganate solution with the mass concentration of 1 percent, and 1m of the surface layer glue is produced 3 The particle board needs 0.5kg of potassium permanganate solution, the raw materials and water with the glue application amount of 10 percent are mixed under the stirring state of 1500-1800 r/min, high-speed dispersion is carried out for 40-80 min, the pH value is adjusted to 5-7, viscous surface layer glue with uniform flowing state is formed, the viscosity is controlled to be about 200-500mPa.s (N-95 rotational viscometer, no. 2 rotor/60 rotating speed), the solid content is 20-30 percent, and the detection is carried outAnd (5) the measured indexes are qualified, and the measured indexes are pumped into a storage tank for standby.
In the upper and lower core layers, the isocyanate glue accounts for 1% of the raw materials of the upper and lower core layers.
The glue applying amount of the core layer glue is 25% of that of the core layer wood shavings, the raw materials of the core layer glue comprise 2 parts of waterproof agent paraffin emulsion, 10 parts of isocyanate (MDI) adhesive, 1 part of aromatic organic acid anhydride curing agent and 0.5 part of phenolic resin release agent, the raw materials and water with the glue applying amount of 10% are mixed under the stirring state of 1500-1800 r/min, the mixture is dispersed at a high speed for 40-80 min to form viscous core layer glue in a uniform flowing state, the viscosity is controlled to be about 200-500mPa.s (N-95 rotational viscometer, no. 2 rotor/60 rotating speed), the solid content is 20-30%, the detection index is qualified, and the viscous core layer glue is pumped into a storage tank for standby.
2. Paving, prepressing and hot-pressing
Carrying out technological treatment such as smashing and drying on the upper surface layer, the lower surface layer, the upper core layer and the core layer, respectively putting the shavings into a shaving board production device, spraying the corresponding glue, controlling the water content to be 12-20%, stirring for 3-8 min at the rotating speed of 500-800 r/min, paving, wherein the inner core three-layer shavings are paved in a criss-cross and oriented manner, and after finishing, prepressing, hot-pressing, plate-turning cooling, tempering and sanding are carried out to obtain a finished shaving board product;
the prepressing conditions are as follows: prepressing for 20-40 s at 20-35 ℃ and 3.5 MPa;
the hot pressing conditions are as follows: the first section hot pressing temperature is 200-220 ℃, the pressure is 8-11 MPa, the hot pressing time is 5s/mm, the second section hot pressing temperature is 180-190 ℃, the pressure is 4-6 MPa, the hot pressing time is 10s/mm, the third section hot pressing temperature is 160-170 ℃, the pressure is 4-6 MPa, and the hot pressing time is 5s/mm.
Example 2
The preparation method of the isocyanate-containing formaldehyde-free shaving board comprises the following steps:
1. preparing raw materials:
including upper and lower top layer, time sandwich layer, sandwich layer from top to bottom, upper and lower top layer comprises top layer glue and the wooden fine wood shavings in top layer that are located the top layer glue, the sandwich layer comprises sandwich layer glue and the wooden rough shavings of sandwich layer that are located the sandwich layer glue, and the time sandwich layer comprises isocyanate glue, wooden shavings.
The weight of the raw materials of the upper surface layer and the lower surface layer accounts for 55 percent of the total raw materials of the shaving board, the weight ratio of the raw materials of the upper surface layer to the raw materials of the lower surface layer is 1:1, the weight of the raw materials of the upper core layer to the weight of the raw materials of the lower core layer and the raw materials of the core layer account for 45 percent of the total raw materials of the plates of the shaving board, wherein the weight ratio of the raw materials of the core layer accounts for 15 percent, and the weight ratio of the raw materials of the upper core layer to the raw materials of the lower core layer accounts for 1:1.
The glue amount of the surface layer glue is 25 percent of that of the surface layer wood shavings, the raw materials of the surface layer glue comprise 40 parts of vegetable protein glue, 5 parts of waterborne polyurethane adhesive, 5 parts of waterproof agent paraffin emulsion, 10 parts of isocyanate (MDI) adhesive, 5 parts of attapulgite and a proper amount of hydrogen peroxide solution with the mass concentration of 1 percent, and 1m of the glue is produced 3 The shaving board needs 1kg of hydrogen peroxide solution, the raw materials and water with the glue application amount of 10 percent are mixed under the stirring state of 1500-1800 r/min, the mixture is dispersed at high speed for 40-80 min, the pH value is adjusted to 5-7, viscous surface layer glue in a uniform flowing state is formed, the viscosity is controlled to be about 200-500mPa.s (N-95 rotational viscometer, no. 2 rotor/60 rotating speed), the solid content is 20-30 percent, the detection index is qualified, and the viscous surface layer glue is pumped into a storage tank for standby.
In the upper and lower core layers, the isocyanate glue accounts for 1% of the raw materials of the upper and lower core layers.
The glue applying amount of the core layer glue is 25% of that of the core layer wood shavings, the raw materials of the core layer glue comprise 4 parts of waterproof agent paraffin emulsion, 20 parts of isocyanate (MDI) adhesive, 5 parts of aromatic organic acid anhydride curing agent and 2 parts of phenolic resin release agent, the raw materials and water with the glue applying amount of 10% are mixed under the stirring state of 1500-1800 r/min, the mixture is dispersed at a high speed for 40-80 min to form viscous core layer glue in a uniform flowing state, the viscosity is controlled to be about 200-500mPa.s (N-95 rotational viscometer, no. 2 rotor/60 rotating speed), the solid content is 20-30%, the detection index is qualified, and the viscous core layer glue is pumped into a storage tank for standby.
2. Paving, prepressing and hot-pressing
Carrying out technological treatment such as smashing and drying on the upper surface layer, the lower surface layer, the upper core layer and the core layer, respectively putting the shavings into a shaving board production device, spraying the corresponding glue, controlling the water content to be 12-20%, stirring for 3-8 min at the rotating speed of 500-800 r/min, paving, wherein the inner core three-layer shavings are paved in a criss-cross and oriented manner, and after finishing, prepressing, hot-pressing, plate-turning cooling, tempering and sanding are carried out to obtain a finished shaving board product;
the prepressing conditions are as follows: prepressing for 20-40 s at 20-35 ℃ and 3.5 MPa;
the hot pressing conditions are as follows: the first section hot pressing temperature is 200-220 ℃, the pressure is 8-11 MPa, the hot pressing time is 5s/mm, the second section hot pressing temperature is 180-190 ℃, the pressure is 4-6 MPa, the hot pressing time is 10s/mm, the third section hot pressing temperature is 160-170 ℃, the pressure is 4-6 MPa, and the hot pressing time is 5s/mm.
Example 3
A method for preparing an isocyanate-containing formaldehyde-free shaving board comprises the following steps:
1. preparing raw materials:
including upper and lower top layer, time sandwich layer, sandwich layer from top to bottom, upper and lower top layer comprises top layer glue and the wooden fine wood shavings in top layer that are located the top layer glue, the sandwich layer comprises sandwich layer glue and the wooden rough shavings of sandwich layer that are located the sandwich layer glue, and the time sandwich layer comprises isocyanate glue, wooden shavings.
The weight of the raw materials of the upper surface layer and the lower surface layer accounts for 50 percent of the total raw materials of the shaving board, the weight ratio of the raw materials of the upper surface layer to the raw materials of the lower surface layer is 1:1, the weight of the raw materials of the upper core layer to the weight of the lower core layer and the raw materials of the core layer account for 50 percent of the total raw materials of the shaving board according to the weight of the raw materials of the upper core layer and the lower core layer, wherein the weight ratio of the raw materials of the core layer accounts for 10 percent, and the weight ratio of the raw materials of the upper core layer to the raw materials of the lower core layer accounts for 1:1.
The glue application amount of the surface layer glue is 25 percent of that of the surface layer wood shavings, the raw materials of the surface layer glue comprise 20 parts of vegetable protein glue, 3 parts of waterborne polyurethane adhesive, 2 parts of waterproof agent paraffin emulsion, 7 parts of isocyanate (MDI) adhesive, 4 parts of attapulgite and a proper amount of potassium permanganate solution with mass concentration of 0.5 percent, and 1m of the surface layer glue is produced 3 The particle board needs 0.5kg of potassium permanganate solution, the raw materials and water with 10 percent of glue application amount are mixed under the stirring state of 1500-1800 r/min, high-speed dispersion is carried out for 40-80 min, the pH value is adjusted to 5-7, viscous surface layer glue in a uniform flowing state is formed, the viscosity is controlled to be about 200-500mPa.s (N-95 rotational viscometer, no. 2 rotor/60 rotating speed), the solid content is 20-30 percent, the detection index is qualified, and the raw materials are pumped into a storage tank for standby.
In the upper and lower core layers, the isocyanate glue accounts for 1% of the raw materials of the upper and lower core layers.
The glue applying amount of the core layer glue is 25% of that of the core layer wood shavings, the raw materials of the core layer glue comprise 3 parts of waterproof agent paraffin emulsion, 15 parts of isocyanate (MDI) adhesive, 3 parts of aromatic organic acid anhydride curing agent and 1 part of phenolic resin release agent, the raw materials and water with the glue applying amount of 10% are mixed under the stirring state of 1500-1800 r/min, the mixture is dispersed at a high speed for 40-80 min to form viscous core layer glue in a uniform flowing state, the viscosity is controlled to be about 200-500mPa.s (N-95 rotational viscometer, no. 2 rotor/60 rotating speed), the solid content is 20-30%, the detection index is qualified, and the viscous core layer glue is pumped into a storage tank for standby.
2. Paving, prepressing and hot-pressing
Carrying out technological treatment such as smashing and drying on the upper surface layer, the lower surface layer, the upper core layer and the core layer, respectively putting the shavings into a shaving board production device, spraying the corresponding glue, controlling the water content to be 12-20%, stirring for 3-8 min at the rotating speed of 500-800 r/min, paving, wherein the inner core three-layer shavings are paved in a criss-cross and oriented manner, and after finishing, prepressing, hot-pressing, plate-turning cooling, tempering and sanding are carried out to obtain a finished shaving board product;
the prepressing conditions are as follows: prepressing for 20-40 s at 20-35 ℃ and 3.5 MPa;
the hot pressing conditions are as follows: the first section hot pressing temperature is 200-220 ℃, the pressure is 8-11 MPa, the hot pressing time is 5s/mm, the second section hot pressing temperature is 180-190 ℃, the pressure is 4-6 MPa, the hot pressing time is 10s/mm, the third section hot pressing temperature is 160-170 ℃, the pressure is 4-6 MPa, and the hot pressing time is 5s/mm.
According to the requirements of national standard GB/T4897-2015 of the particle board and the physical property test method of the artificial board and the artificial veneer of GB/T17657-2013, the performance indexes of the particle board with the exemplary oriented structure are as follows:
the foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. The formaldehyde-free shaving board containing isocyanate is characterized by comprising an upper surface layer, a lower surface layer, an upper secondary core layer, a lower secondary core layer and a core layer, wherein the upper surface layer and the lower surface layer comprise 10-40 parts of vegetable protein glue, 1-5 parts of adhesive, 2-5 parts of waterproof agent, 5-10 parts of isocyanate adhesive, 2-5 parts of attapulgite and 0.5-1% of oxidant solution by mass concentration, and 1m of oxidant solution is produced 3 0.5-2 kg of shaving board oxidizing agent solution;
the upper and lower secondary core layer raw materials comprise isocyanate glue and account for 1 percent of the upper and lower secondary core layer raw materials;
the core layer comprises 2-5 parts of a waterproof agent, 10-20 parts of an isocyanate adhesive, 1-5 parts of a curing agent and 0.5-2 parts of a release agent.
2. The aldehyde-free particle board as claimed in claim 1, wherein the weight of the upper and lower surface layer raw materials accounts for 50-60% of the total weight of the particle board raw materials, and the weight of the upper and lower core layer raw materials and the core layer raw materials accounts for 40-50% of the total weight of the particle board raw materials, wherein the weight of the core layer raw materials accounts for 10-15%.
3. The aldehyde-free particle board of claim 2, wherein the mass ratio of the upper and lower skin layer raw materials is 1:1, and the mass ratio of the upper and lower core layer raw materials is 1:1.
4. The aldehyde-free particle board of claim 1, wherein the adhesive in the raw materials of the upper and lower surface layers is EVA emulsion and/or aqueous polyurethane adhesive;
the waterproof agent is selected from paraffin emulsion, organic silicon or fatty acid salt;
the oxidant is selected from potassium permanganate or peroxide.
5. The aldehyde-free particle board of claim 1 wherein the water repellent in the core layer material is selected from the group consisting of paraffin emulsions, silicones, and fatty acid salts;
the curing agent is one selected from glyoxal, glutaraldehyde and aromatic organic acid anhydride;
the release agent is aqueous polysiloxane emulsion, epoxy resin or phenolic resin.
6. A process for the preparation of an aldehyde-free particle board according to any of claims 1 to 5, characterized in that the steps comprise:
(1) Respectively taking raw materials of an upper surface layer, a lower surface layer, an upper secondary core layer and a lower secondary core layer, and preparing glue;
(2) The upper surface layer raw material, the lower surface layer raw material, the upper secondary core layer raw material, the lower secondary core layer raw material and the core layer raw material are respectively glued, paved, pre-pressed and hot-pressed, and the inner core three-layer sliced sheet is paved in a criss-cross and directional manner.
7. The method according to claim 6, wherein the core layer glue is applied in an amount of 20-30% of the core layer wood shavings, the surface layer glue is applied in an amount of 25-30% of the surface layer wood shavings, and the isocyanate glue is 1% of the upper and lower core layer materials.
8. The preparation method of claim 6, wherein the viscosity of the glue is controlled to be 200-500mPa.s.
9. The production method according to claim 6, wherein the condition of the pre-pressing is: prepressing for 20-40 s at 20-35 ℃ and 3-4 MPa.
10. The method according to claim 6, wherein the hot pressing conditions are: the first section hot pressing temperature is 200-220 ℃, the pressure is 8-11 MPa, the hot pressing time is 5s/mm, the second section hot pressing temperature is 180-190 ℃, the pressure is 4-6 MPa, the hot pressing time is 10s/mm, the third section hot pressing temperature is 160-170 ℃, the pressure is 4-6 MPa, and the hot pressing time is 5s/mm.
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| CN202211640101.6A CN115781831A (en) | 2022-12-20 | 2022-12-20 | Isocyanate-containing formaldehyde-free shaving board and preparation method thereof |
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| CN202211640101.6A CN115781831A (en) | 2022-12-20 | 2022-12-20 | Isocyanate-containing formaldehyde-free shaving board and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117141094A (en) * | 2023-08-31 | 2023-12-01 | 永清霍尔茨门业有限公司 | Preparation process of super-soft fireproof plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117141094A (en) * | 2023-08-31 | 2023-12-01 | 永清霍尔茨门业有限公司 | Preparation process of super-soft fireproof plate |
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