CN111571758B - Production process of moisture-proof super E0 bamboo chip shaving board - Google Patents
Production process of moisture-proof super E0 bamboo chip shaving board Download PDFInfo
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- CN111571758B CN111571758B CN202010533158.0A CN202010533158A CN111571758B CN 111571758 B CN111571758 B CN 111571758B CN 202010533158 A CN202010533158 A CN 202010533158A CN 111571758 B CN111571758 B CN 111571758B
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- 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
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- 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
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- 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
- B27N3/10—Moulding of mats
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- 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
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
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Abstract
The invention discloses a production process of a moisture-proof super E0 bamboo chip shaving board, which comprises the following process steps: firstly, wood shavings are formed on selected bamboo wood, and the bamboo shavings are dried; preparing glue for bamboo chip shavings; gluing the bamboo wood shavings; paving the surface layer wood shavings and the core layer wood shavings respectively to manufacture a plate blank; and then carrying out hot press molding on the plate blank combination to obtain the composite plate. Starting from the problem of difficult gluing, the moisture content of the bamboo chip shavings is fully reduced, the glue formula is changed, the solid content of the glue is improved, the yield of products is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of artificial board production processes, in particular to a production process of a moisture-proof super E0 bamboo chip shaving board. .
Background
The moisture-proof super E0 artificial board is a board with higher technical content in the artificial board industry, only a moisture-proof super E0 wood shaving board exists in the industry at present, and the moisture-proof super E0 bamboo chip shaving board belongs to the industrial problem, although the production process of the bamboo shaving board looks as similar as the wood shaving board, the bamboo chip surface is smooth and difficult to glue, so that the bamboo chip surface is difficult to effectively utilize, and only a few production lines produce a small amount of moisture-proof super E0 bamboo chip shaving boards under the condition of not counting the cost.
Therefore, the difficulty in the prior art is mainly that gluing is difficult, bamboo chips and glue are difficult to be fully mixed, and the bonding effect is ensured.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a production process of a moisture-proof super E0 bamboo chip shaving board, which is designed for solving the problem of difficult gluing, fully reduces the water content of bamboo chip shaving, changes the glue formula, improves the solid content of glue, improves the yield of products, and reduces the production cost.
In order to realize the purpose of the invention, the invention provides a production process of a moisture-proof super E0 bamboo dust particle board, which comprises the following process steps:
a production process of a moisture-proof super E0 bamboo chip shaving board comprises the following process steps:
s1: drying the bamboo wood shavings, namely conveying the bamboo wood shavings into a single channel for drying at the rotating speed of 1.9-2.4r/s and the temperature of 200-;
s2: a step of preparing the glue,
step 1, putting formaldehyde into a container, adding liquid alkali with the concentration of 30%, adjusting the pH value to 8.0-8.8, and sequentially adding urea and melamine to obtain a mixture with the pH value being more than or equal to 8.0;
step 2, timing from the completion of the addition of the urea, firstly heating to 70 ℃, then heating to 90 +/-2 ℃ within 40-50min, and then preserving heat for 30 min;
step 3, cooling to 86 ℃, adding 20% formic acid, adjusting the pH value to 4.35-5.50, and controlling the acid adjusting time to be 30-50 min;
step 4, continuing to react for 50-70min, controlling the reaction temperature at 90 +/-2 ℃, adding 30% of liquid alkali when the viscosity reaches 19-24 seconds, adjusting the pH value to 6.6-6.8, and then adding urea;
step 5, after continuing to react for 5min, detecting whether the pH value is 6.3-6.35, and supplementing 30% concentration liquid caustic soda to regulate the pH value to 6.3-6.35 when the pH value is lower than 6.35;
step 6, adjusting the reaction temperature to 88 +/-2 ℃, adding 30% liquid caustic soda when the viscosity reaches 19-25 seconds, and adjusting the pH value to 7.5-8.5;
step 7, cooling to 75-80 ℃, adding melamine and urea, detecting whether the pH value is higher than 7.2, if the pH value is lower than 7.2, adding 30% concentration liquid alkali for regulation, then cooling to 37 ℃, regulating the pH value to 8.5-9.5, and if the pH value is lower than 8.5, supplementing 30% concentration liquid alkali for regulation; adding 20% formic acid for regulation if the pH value is higher than 9.5, and discharging the glue;
s3: gluing the bamboo wood shavings, namely mixing the glue, the mildew preventive, the waterproof agent, the paraffin, the water and the curing agent prepared in the step S2 with the surface layer wood shavings and the core layer wood shavings respectively;
s4: paving the slab, namely feeding the surface layer mixture and the core layer mixture prepared in the step S3 into a paving machine in a grading manner to prepare the corresponding surface layer slab and the corresponding core layer slab;
s5: and (3) hot-press forming, namely hot-pressing the plate blanks according to a combination mode of two surface layer plate blanks and one core layer plate blank to obtain the composite plate.
Before the drying in the step S1, bamboo wood needs to be smashed by a chipping machine and then subjected to hammer planing by a hammer planer to prepare bamboo chips with the thickness of 0.5-1.2 mm; and the bamboo chips with the thickness not within the range are prepared again by using the ring type flaker.
As a preferable scheme, after the drying in step S1, the bamboo chips need to be sieved and divided into surface layer chips and core layer chips; in addition, conveying the oversize bamboo chips to a grinding machine, grinding again and putting into production again; the fine dust material is sent to the heat energy center for combustion.
As a preferable scheme, the screening is followed by air separation by utilizing the light characteristics of impurities, and the impurities and the wood shavings are separated.
As a preferable scheme, in step S2, the melamine is modified melamine, and the modified melamine is prepared by a method comprising the following steps: 1) weighing 20kg of fucoidin and 30kg of Guluomannan polysaccharide into a container, adding 800kg of water and 700kg of propionic acid, preserving the heat for 6-8h at the temperature of 70-77 ℃, cooling and filtering to obtain a mixture; 2) taking 500-600kg of the mixture, adding 70-75kg of boric acid, heating to 60-70 ℃, and stirring to completely dissolve the boric acid to obtain melamine modified liquid; 3) and adding the melamine modified liquid into melamine, adding 15-20kg of the melamine modified liquid into each ton of melamine, and fully and uniformly stirring to prepare the modified melamine.
As a preferable scheme, in the step S2, the urea is modified urea, and the modified urea is prepared by a method comprising the following steps: 1) adding 24 parts of water and 18 parts of propionaldehyde into a reaction device for stirring; 2) then adding sodium hydroxide solid to adjust the pH value to 9, stirring and heating to 50-60 ℃, and adding 50 parts of urea into a reaction device; 3) stirring for 60 minutes, adding 8-12 parts of diethylene glycol diethyl ether and 2-4 parts of caprolactam, and continuously stirring; 4) continuously heating to 80-90 ℃, continuously controlling the stirring reaction, keeping the temperature, and controlling the rotating speed at 400-650 r/min; 5) and naturally cooling, stirring while cooling, cooling to below 40 ℃, filtering and discharging to obtain the modified urea.
As a preferable mode, in step S2, step 6, after adjusting the reaction temperature, the viscosity of the mixture at 30 ℃ is measured.
Preferably, the water content after sizing is not more than 10% in order to reduce the defective rate due to delamination and bubbling at step S3.
Preferably, in the step S3 of applying glue, the amount of surface layer glue is 40L/m3The amount of core layer glue is 55L/m3The dosage of the surface mildew preventive is 0.07Kg/m3The dosage of the core layer mildew preventive is 0.11Kg/m3The dosage of the surface waterproofing agent is 3.9L/m3The dosage of the core layer paraffin is 1.59L/m3The surface water consumption is 4L/m3The dosage of the surface layer curing agent is 1.2L/m3The dosage of the core layer curing agent is 1.8L/m3。
Preferably, the surface layer blanks are laid by air flow and the core layer blanks are laid by machine in step S4.
Preferably, after the slab is laid in step S4, the slab is pre-pressed to have an initial strength before hot pressing.
As a preferable scheme, the hot pressing temperature of the step 5 is 210-220 ℃, and the hot pressing pressure is 1.5-3.5 MPa; after hot press forming, the plates are sequentially cooled, stacked, stored, transported, sanded and sawed to prepare finished products which meet the specification and size and can be packaged.
Compared with the prior art, the implementation of the invention has the beneficial effects that:
the moisture-proof super E0 artificial board is a production process of artificial boards, starting from the problem that the bamboo shaving board is difficult to glue, the moisture content of bamboo shavings is fully reduced, the formula of glue and the glue making process are improved, the bamboo shavings and the glue are fully mixed, hot pressing and other methods are carried out in a specific hot pressing process, the finished product rate of products is improved, the production cost is reduced, the prepared moisture-proof super E0 bamboo shavings shaving board has excellent internal bonding strength and static bending strength, the good bonding effect of the bamboo shavings and the glue is ensured, the moisture-proof effect is excellent, the formaldehyde content release standard can reach the E0-level environmental protection standard, the finished product rate of the bamboo shavings can be improved, and the production cost is reduced.
Drawings
FIG. 1 is a flow chart of the production process of the moisture-proof super E0 bamboo chip particle board.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example 1:
a production process of a moisture-proof super E0 bamboo chip shaving board comprises the following steps:
s1: before drying, bamboo is smashed by a chipping machine and then is subjected to hammer planing by a hammer planer to prepare bamboo chip shavings with the thickness of 0.5-1.2 mm; and the bamboo bits shavings with the thickness not within the range are prepared again by using a ring type flaker; drying the bamboo shavings, namely feeding the bamboo shavings into a single channel for drying at the rotation speed of 1.9r/s and the temperature of 200 ℃ so that the water content of the dried bamboo shavings is not more than 3%; after drying, screening the bamboo chips into surface layer chips and core layer chips; in addition, conveying the oversize bamboo chips to a grinding machine, grinding again and putting into production again; feeding the fine dust material into a heat energy center for combustion; after screening, winnowing by utilizing the light characteristics of impurities to separate the impurities from the wood shavings;
s2: a step of preparing the glue,
step 1, adding 17500kg of formaldehyde into a container, adding 30% liquid alkali by mass percentage concentration, wherein the liquid alkali is a sodium hydroxide solution, adjusting the pH value to 8.0, and sequentially adding urea and melamine to obtain a mixture with the pH value being more than or equal to 8.0;
step 2, timing from the completion of the addition of the urea, firstly heating to 70 ℃, then heating to 90 ℃ within 40min, and then preserving heat for 30 min;
step 3, cooling to 86 ℃, adding 20% formic acid, adjusting the pH value to 4.35, and controlling the acid adjusting time to be 30 min;
step 4, continuing to react for 50-70min, controlling the reaction temperature at 90 ℃, adding 30% liquid caustic soda when the viscosity reaches 19 seconds, adjusting the pH value to 6.6, and then adding urea;
and 5, after continuously reacting for 5min, detecting whether the pH value is 6.3, supplementing liquid alkali when the pH value is lower than 6.35 to adjust the pH value to 6.3, and adding 1 liter of liquid alkali when the pH value is lower than 0.1 for supplementing, for example: pH6.05, then 3 liters of liquid alkali is supplemented;
step 6, adjusting the reaction temperature to 88 +/-2 ℃, adding 30% liquid alkali when the viscosity reaches 19 seconds, and adjusting the pH value to 7.5;
step 7, cooling to 75 ℃, adding melamine and urea, detecting whether the pH value is higher than 7.2, if the pH value is lower than 7.2, adding 30% concentration liquid alkali for adjustment, then cooling to 37 ℃, adjusting the pH value to 8.5, and if the pH value is lower than 8.5, supplementing 30% concentration liquid alkali for adjustment; adding 20% formic acid for regulation if the pH value is higher than 9.5, and discharging the glue;
a total of 16175kg urea and 1400kg melamine were added in the above step.
S3: gluing the bamboo wood shavings, namely mixing the glue, the mildew preventive, the waterproof agent, the paraffin, the water and the curing agent prepared in the step S2 with the surface layer wood shavings and the core layer wood shavings respectively; in order to reduce the rejection rate caused by layering and bubbling, the water content after sizing does not exceed 10 percent; wherein in the gluing process, the dosage of the surface glue is 40L/m3The amount of core layer glue is 55L/m3The dosage of the surface mildew preventive is 0.07Kg/m3The dosage of the core layer mildew preventive is 0.11Kg/m3The dosage of the surface waterproofing agent is 3.9L/m3The dosage of the core layer paraffin is 1.59L/m3The surface water consumption is 4L/m3The dosage of the surface layer curing agent is 1.2L/m3The dosage of the core layer curing agent is 1.8L/m3；
S4: paving the slab, namely feeding the surface layer mixture and the core layer mixture prepared in the step S3 into a paving machine in a grading manner to prepare the corresponding surface layer slab and the corresponding core layer slab; wherein, the surface layer plate blank is paved by airflow, and the core layer plate blank is paved by machinery; after the plate blank is paved, the plate blank needs to be pre-pressed and formed, so that the plate blank has initial strength before hot pressing;
s5: hot-press forming, namely hot-pressing the plate blank according to a combination mode of two surface layer plate blanks and one core layer plate blank to obtain a composite plate; in the step 5, the hot pressing temperature is 210 ℃, and the hot pressing pressure is 1.5 MPa; after hot press forming, sequentially carrying out cooling stacking, storage and transportation, sanding and saw cutting on the plates to prepare finished products which meet the specification and size and can be packaged; after hot press forming, the plates are sequentially cooled, stacked, stored, transported, sanded and sawed to prepare finished products which meet the specification and size and can be packaged.
In step S2, the melamine is a modified melamine, and the modified melamine is prepared by a method comprising the following steps: 1) weighing 20kg of fucoidin and 30kg of Guluomannan polysaccharide in a container, adding 700kg of water, adding 20kg of propionic acid, preserving the heat for 6 hours at the temperature of 70 ℃, cooling and filtering to obtain a mixture; 2) taking 500kg of the mixture, adding 70kg of boric acid, heating to 60 ℃, and stirring to completely dissolve the boric acid to obtain melamine modified liquid; 3) and adding the melamine modified solution into melamine, adding 15kg of melamine modified solution into each ton of melamine, and fully and uniformly stirring to prepare the modified melamine.
In step S2, the urea is modified urea, and the modified urea is prepared by a method comprising the following steps: 1) adding 24 parts of water and 18 parts of propionaldehyde into a reaction device for stirring; 2) then adding sodium hydroxide solid to adjust the pH value to 9, stirring and heating to 50 ℃, and adding 50 parts of urea into a reaction device; 3) stirring for 60 minutes, adding 8 parts of diethylene glycol diethyl ether and 2 parts of caprolactam, and continuously stirring; 4) continuously heating to 80 ℃, continuously controlling stirring reaction, keeping the temperature, and controlling the rotating speed at 400 r/min; 5) and naturally cooling, stirring while cooling, cooling to below 40 ℃, filtering and discharging to obtain the modified urea.
Example 2:
a production process of a moisture-proof super E0 bamboo chip shaving board comprises the following steps:
s1: before drying, bamboo is smashed by a chipping machine and then is subjected to hammer planing by a hammer planer to prepare bamboo chip shavings with the thickness of 0.5-1.2 mm; and the bamboo bits shavings with the thickness not within the range are prepared again by using a ring type flaker; drying the bamboo wood shavings, namely conveying the bamboo wood shavings into a single channel for drying at the rotating speed of 1.9-2.4r/s and the temperature of 200-; after drying, screening the bamboo chips into surface layer chips and core layer chips; in addition, conveying the oversize bamboo chips to a grinding machine, grinding again and putting into production again; feeding the fine dust material into a heat energy center for combustion; after screening, winnowing by utilizing the light characteristics of impurities to separate the impurities from the wood shavings;
s2: a step of preparing the glue,
step 1, putting formaldehyde into a container, adding liquid caustic soda with the concentration of 30%, adjusting the pH value to 8.8, and sequentially adding urea and melamine to obtain a mixture with the pH value being more than or equal to 8.0;
step 2, timing from the completion of the addition of the urea, firstly heating to 70 ℃, then heating to 92 ℃ within 50min, and then preserving heat for 30 min;
step 3, cooling to 86 ℃, adding 20% formic acid, adjusting the pH value to 5.50, and controlling the acid adjusting time to be 50 min;
step 4, continuing to react for 70min, controlling the reaction temperature at 92 ℃, adding 30% liquid caustic soda when the viscosity reaches 24 seconds, adjusting the pH value to 6.8, and then adding urea;
step 5, after continuing to react for 5min, detecting whether the pH value is 6.35, and supplementing 30% concentration liquid caustic soda to regulate the pH value to 6.35 when the pH value is lower than 6.35;
step 6, adjusting the reaction temperature to 88 +/-2 ℃, adding 30% liquid alkali when the viscosity reaches 25 seconds, and adjusting the pH value to 8.5;
step 7, cooling to 80 ℃, adding melamine and urea, detecting whether the pH value is higher than 7.2, if the pH value is lower than 7.2, adding 30% concentration liquid alkali for adjustment, then cooling to 37 ℃, adjusting the pH value to 9.5, and if the pH value is lower than 8.5, supplementing 30% concentration liquid alkali for adjustment; adding 20% formic acid for regulation if the pH value is higher than 9.5, and discharging the glue;
s3: applying glue to the bamboo shavingsThe glue, the mildew preventive, the waterproof agent, the paraffin, the water and the curing agent prepared in the step S2 are respectively mixed with the surface layer wood shavings and the core layer wood shavings; in order to reduce the rejection rate caused by layering and bubbling, the water content after sizing does not exceed 10 percent; wherein in the gluing process, the dosage of the surface glue is 40L/m3The amount of core layer glue is 55L/m3The dosage of the surface mildew preventive is 0.07Kg/m3The dosage of the core layer mildew preventive is 0.11Kg/m3The dosage of the surface waterproofing agent is 3.9L/m3The dosage of the core layer paraffin is 1.59L/m3The surface water consumption is 4L/m3The dosage of the surface layer curing agent is 1.2L/m3The dosage of the core layer curing agent is 1.8L/m3；
S4: paving the slab, namely feeding the surface layer mixture and the core layer mixture prepared in the step S3 into a paving machine in a grading manner to prepare the corresponding surface layer slab and the corresponding core layer slab; wherein, the surface layer plate blank is paved by airflow, and the core layer plate blank is paved by machinery; after the plate blank is paved, the plate blank needs to be pre-pressed and formed, so that the plate blank has initial strength before hot pressing;
s5: hot-press forming, namely hot-pressing the plate blank according to a combination mode of two surface layer plate blanks and one core layer plate blank to obtain a composite plate; the hot pressing temperature in the step 5 is 220 ℃, and the hot pressing pressure is 3.5 MPa; after hot press forming, sequentially carrying out cooling stacking, storage and transportation, sanding and saw cutting on the plates to prepare finished products which meet the specification and size and can be packaged; after hot press forming, the plates are sequentially cooled, stacked, stored, transported, sanded and sawed to prepare finished products which meet the specification and size and can be packaged.
In step S2, the melamine is a modified melamine, and the modified melamine is prepared by a method comprising the following steps: 1) weighing 20kg of fucoidin and 30kg of Guluomannan polysaccharide in a container, adding 800kg of water, adding 20kg of propionic acid, preserving the heat for 8 hours at 77 ℃, cooling and filtering to obtain a mixture; 2) taking 600kg of the mixture, adding 75kg of boric acid, heating to 70 ℃, and stirring to completely dissolve the boric acid to obtain melamine modified liquid; 3) and adding the melamine modified liquid into melamine, adding 20kg of melamine modified liquid into each ton of melamine, and fully and uniformly stirring to prepare the modified melamine.
In step S2, the urea is modified urea, and the modified urea is prepared by a method comprising the following steps: 1) adding 24 parts of water and 18 parts of propionaldehyde into a reaction device for stirring; 2) then adding sodium hydroxide solid to adjust the pH value to 9, stirring and heating to 60 ℃, and adding 50 parts of urea into a reaction device; 3) stirring for 60 minutes, adding 12 parts of diethylene glycol diethyl ether and 4 parts of caprolactam, and continuously stirring; 4) continuously heating to 90 ℃, continuously controlling stirring reaction, keeping the temperature, and controlling the rotating speed at 650 r/min; 5) and naturally cooling, stirring while cooling, cooling to below 40 ℃, filtering and discharging to obtain the modified urea.
Comparative example 1
Comparative example 1 is different from example 1 in that melamine is used in place of the modified melamine described in the present invention in the glue making process of step S2, and the rest of the operation steps and method are the same as those of example 1.
Comparative example 2
Comparative example 2 is different from example 1 in that urea is used instead of the modified melamine in the step S2 of making the glue, and the rest of the operation steps and method are the same as those of example 1.
Comparative example 3
Comparative example 3 is different from example 1 in that melamine and urea are used instead of the modified melamine and modified urea according to the present invention in the step S2 gum making process, and the remaining operation steps and method are the same as those of example 1.
Physicochemical detection is carried out on the bamboo chip shaving board products obtained in examples 1-2 and comparative examples 1-3 according to GB/T17657-2013, and the results are shown in Table 1
Table 1 test results of moisture resistant super E0 bamboo shaving board
According to the test results in table 1, the process of the invention improves the glue formula and the glue making process, so that the bamboo chips and the glue are fully mixed, and hot pressing is carried out in a specific hot pressing process, so that the prepared moisture-proof super E0 bamboo chip shaving board has excellent internal bonding strength and static bending strength, good bonding effect of the bamboo chips and the glue is ensured, the yield of the bamboo chip shaving board can be improved, and the production cost can be reduced.
The features of the invention claimed and/or described in the specification may be combined, and are not limited to the combinations set forth in the claims by the recitations therein. The technical solutions obtained by combining the technical features in the claims and/or the specification also belong to the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (9)
1. A production process of a moisture-proof super E0 bamboo chip shaving board comprises the following process steps:
s1: drying the bamboo wood shavings, namely conveying the bamboo wood shavings into a single channel for drying at the temperature of 200-225 ℃ so that the moisture content of the dried bamboo wood shavings is not more than 3%;
s2: a step of preparing the glue,
step 1, adding a proper amount of formaldehyde into a container, adding 30% concentration liquid caustic soda, adjusting the pH value to 8.0-8.8, and sequentially adding a proper amount of urea and melamine to obtain a mixture with the pH value being more than or equal to 8.0;
step 2, timing from the completion of the addition of the urea, firstly heating to 70 ℃, then heating to 90 +/-2 ℃ within 40-50min, and then preserving heat for 30 min;
step 3, cooling to 86 ℃, adding 20% formic acid, adjusting the pH value to 4.35-5.50, and controlling the acid adjusting time to be 30-50 min;
step 4, continuing to react for 50-70min, controlling the reaction temperature at 90 +/-2 ℃, adding 30% of liquid alkali when the viscosity reaches 19-24 seconds, adjusting the pH value to 6.6-6.8, and then adding urea;
step 5, after continuing to react for 5min, detecting whether the pH value is 6.3-6.35, and supplementing 30% concentration liquid caustic soda to regulate the pH value to 6.3-6.35 when the pH value is lower than 6.35;
step 6, adjusting the reaction temperature to 88 +/-2 ℃, adding 30% liquid caustic soda when the viscosity reaches 19-25 seconds, and adjusting the pH value to 7.5-8.5;
step 7, cooling to 75-80 ℃, adding melamine and urea, detecting whether the pH value is higher than 7.2, if the pH value is lower than 7.2, adding 30% concentration liquid alkali for regulation, then cooling to 37 ℃, regulating the pH value to 8.5-9.5, and if the pH value is lower than 8.5, supplementing 30% concentration liquid alkali for regulation; adding 20% formic acid for regulation if the pH value is higher than 9.5, and discharging the glue;
the melamine is modified melamine, and the modified melamine is prepared by a method comprising the following steps: 1) weighing 20kg of fucoidin and 30kg of Guluomannan polysaccharide into a container, adding 800kg of water and 700kg of propionic acid, preserving the heat for 6-8h at the temperature of 70-77 ℃, cooling and filtering to obtain a mixture; 2) taking 500-600kg of the mixture, adding 70-75kg of boric acid, heating to 60-70 ℃, and stirring to completely dissolve the boric acid to obtain melamine modified liquid; 3) adding the melamine modified solution into melamine, adding 15-20kg of melamine modified solution into each ton of melamine, and fully and uniformly stirring to prepare modified melamine;
s3: gluing the bamboo wood shavings, namely mixing the glue, the mildew preventive, the waterproof agent, the paraffin, the water and the curing agent prepared in the step S2 with the surface layer wood shavings and the core layer wood shavings respectively;
s4: paving the slab, namely feeding the surface layer mixture and the core layer mixture prepared in the step S3 into a paving machine in a grading manner to prepare the corresponding surface layer slab and the corresponding core layer slab;
s5: and (3) hot-press forming, namely hot-pressing the plate blanks according to a combination mode of two surface layer plate blanks and one core layer plate blank to obtain the composite plate.
2. The process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 1, wherein: before the drying in the step S1, bamboo wood needs to be smashed by a chipping machine and then subjected to hammer planing by a hammer planer to prepare bamboo chips with the thickness of 0.5-1.2 mm; and the bamboo chips with the thickness not within the range are prepared again by using the ring type flaker.
3. The process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 1, wherein: after the drying in step S1, the bamboo chips need to be screened into surface layer chips and core layer chips; in addition, conveying the oversize bamboo chips to a grinding machine, grinding again and putting into production again; the fine dust material is sent to the heat energy center for combustion.
4. A process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 3, wherein: after screening, the impurities with light characteristics are winnowed to separate the impurities from the wood shavings.
5. The process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 1, wherein: in step S2, the urea is modified urea, and the modified urea is prepared by a method comprising the following steps: 1) adding 24 parts of water and 18 parts of propionaldehyde into a reaction device for stirring; 2) then adding sodium hydroxide solid to adjust the pH value to 9, stirring and heating to 50-60 ℃, and adding 50 parts of urea into a reaction device; 3) stirring for 60 minutes, adding 8-12 parts of diethylene glycol diethyl ether and 2-4 parts of caprolactam, and continuously stirring; 4) continuously heating to 80-90 ℃, continuously controlling the stirring reaction, keeping the temperature, and controlling the rotating speed at 400-650 r/min; 5) and naturally cooling, stirring while cooling, cooling to below 40 ℃, filtering and discharging to obtain the modified urea.
6. The process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 1, wherein: in step 6 of step S2, after the reaction temperature was adjusted, the viscosity of the mixture at 30 ℃ was measured.
7. The process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 1, wherein: in step S3, the water content after sizing is not more than 10% in order to reduce the defective rate due to delamination and bubbling.
8. The process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 1, wherein: in the glue applying process of step S3, the dosage of the surface layer glue is 40L/m3The amount of core layer glue is 55L/m3The dosage of the surface mildew preventive is 0.07Kg/m3The dosage of the core layer mildew preventive is 0.11Kg/m3The dosage of the surface waterproofing agent is 3.9L/m3The dosage of the core layer paraffin is 1.59L/m3The surface water consumption is 4L/m3The dosage of the surface layer curing agent is 1.2L/m3The dosage of the core layer curing agent is 1.8L/m3。
9. The process for producing moisture-proof super E0 bamboo shaving board as claimed in claim 1, wherein: the hot pressing temperature in the step 5 is 210-220 ℃, and the hot pressing pressure is 1.5-3.5 MPa; after hot press forming, the plates are sequentially cooled, stacked, stored, transported, sanded and sawed to prepare finished products which meet the specification and size and can be packaged.
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Denomination of invention: Production process of moisture-proof super E0 bamboo chip Particleboard Effective date of registration: 20211223 Granted publication date: 20210416 Pledgee: Huangpu sub branch of Guangdong Lechang Rural Commercial Bank Co., Ltd Pledgor: HONG WEI WOOD INDUSTRY RENHUA CO.,LTD. Registration number: Y2021980016151 |