CN112852348A - Method for preparing adhesive for wood - Google Patents
Method for preparing adhesive for wood Download PDFInfo
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- CN112852348A CN112852348A CN202110046025.5A CN202110046025A CN112852348A CN 112852348 A CN112852348 A CN 112852348A CN 202110046025 A CN202110046025 A CN 202110046025A CN 112852348 A CN112852348 A CN 112852348A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J131/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Adhesives based on derivatives of such polymers
- C09J131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09J131/04—Homopolymers or copolymers of vinyl acetate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0066—Stirrers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/02—Homopolymers or copolymers of unsaturated alcohols
- C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00054—Controlling or regulating the heat exchange system
- B01J2219/00056—Controlling or regulating the heat exchange system involving measured parameters
- B01J2219/00058—Temperature measurement
- B01J2219/00063—Temperature measurement of the reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
- B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
- B01J2219/00094—Jackets
Abstract
The invention discloses a method for manufacturing a wood adhesive, which comprises the following steps: s101, adding a polyvinyl alcohol aqueous solution into a reaction kettle; s102, adding an emulsifier into the reaction kettle, and simultaneously starting a main stirring shaft to stir for a first time length; s103, dripping vinyl acetate and an initiator into the reaction zone, and simultaneously starting an auxiliary stirring shaft; s104, obtaining the average temperature of each blade temperature sensor; judging whether the average temperature is lower than 60 ℃, if so, starting the heater until the average temperature is higher than 60 ℃, and if not, closing the heater; s105, in response to the average temperature being higher than 80 ℃, closing the auxiliary stirring shaft and opening the main stirring shaft for stirring for a second time period; s106, judging whether residual polyvinyl acetate and an initiator still exist, if so, returning to the step S103, and if not, performing the step S107; s107, cooling the reaction kettle, and adjusting the pH value in the reaction kettle in response to the average temperature being lower than 50 ℃; and S108, stopping the auxiliary stirring shaft and obtaining the wood adhesive in response to the pH value in the reaction kettle being within 6-7.
Description
Technical Field
The invention relates to the field of adhesive preparation, in particular to a method for preparing a wood adhesive.
Background
Glued wood, as its name implies, is produced by pressure gluing of wood as a raw material, which can be used as a building material. The gluing and pressing process necessarily involves the use of adhesives, which are commonly referred to as wood adhesives. Compared with the traditional connecting methods of riveting, welding, nailing, threading and the like, the gluing has the advantages of attractive appearance, light weight, high strength, uniform stress distribution and the like, so that the gluing has wide application in modern wooden houses, wooden bridge, wooden tower and other wooden structure buildings.
In the conventional method for manufacturing the wood adhesive, excessive heat is generated by the reaction of raw materials, the reaction needs to be maintained at a certain temperature, and the reaction efficiency is reduced by overhigh temperature. Therefore, in the prior art, a large amount of cooling water is needed to cool the reaction kettle, so that the excessive high temperature caused by the reaction of the raw materials is avoided. However, the excessive use of the cooling water causes waste of resources.
Disclosure of Invention
In view of some of the above-mentioned defects of the prior art, the present invention provides a method for manufacturing a wood adhesive, which aims to reduce the amount of cooling water used in the reaction process of raw materials and ensure the production efficiency of the adhesive.
Therefore, the invention discloses a method for manufacturing a wood adhesive, which comprises the following steps:
s101, adding a polyvinyl alcohol aqueous solution into a reaction kettle; wherein, two reaction zones and two cooling zones are arranged in the reaction kettle, a cooling temperature sensor for monitoring the temperature of the cooling zones in real time is arranged in the cooling zones, the reaction zone and the cooling zone are arranged circumferentially and sequentially comprise a first reaction zone, a second cooling zone, a third reaction zone and a fourth cooling zone, the outer walls of the reaction kettles corresponding to the first reaction zone and the third reaction zone are provided with heaters, the center of the reaction kettle is provided with a main stirring shaft which is connected with two auxiliary stirring shafts, at least one rotating blade is arranged on the auxiliary stirring shaft, at least one blade temperature sensor is arranged on the rotating blade, the main stirring shaft drives the auxiliary stirring shaft to rotate, the auxiliary stirring shaft drives the rotating blades to rotate, and the blade temperature sensor is used for monitoring the temperature of each position in the reaction kettle in real time;
s102, adding an emulsifier into the reaction kettle, and simultaneously starting the main stirring shaft to stir for a first time length; after the stirring for the first time is carried out, stopping the main stirring shaft and enabling the two auxiliary stirring shafts to stay at the central position of the first reaction zone and the central position of the third reaction zone;
s103, dripping vinyl acetate and an initiator into the first reaction zone and the third reaction zone, and simultaneously starting the auxiliary stirring shaft;
s104, obtaining the average temperature of each blade temperature sensor; judging whether the average temperature is lower than 60 ℃, if so, starting the heater until the average temperature is higher than 60 ℃, and if not, closing the heater;
s105, in response to the fact that the average temperature is higher than 80 ℃, closing the auxiliary stirring shaft and opening the main stirring shaft for stirring for a second time period; after the stirring in the second time period is executed, stopping the main stirring shaft and enabling the two auxiliary stirring shafts to stay at the central position of the first reaction zone and the central position of the third reaction zone;
s106, judging whether residual polyvinyl acetate and the initiator still exist, if so, returning to the step S103, otherwise, performing the step S107;
s107, cooling the reaction kettle, responding to the average temperature lower than 50 ℃, adding a sodium bicarbonate water solution and dibutyl phthalate into the reaction kettle, and adjusting the pH value in the reaction kettle;
and S108, stopping the auxiliary stirring shaft and obtaining the wood adhesive in response to the pH value in the reaction kettle being within 6-7.
Optionally, the cooling the reaction kettle in step S107 includes:
cooling the reaction kettle by injecting cooling water into the jacket; wherein, the jacket is arranged on the outer wall of the reaction kettle corresponding to the cooling area.
Optionally, before performing step S101, the method further includes:
step S201: and dissolving polyvinyl alcohol powder in deionized water to obtain the polyvinyl alcohol aqueous solution.
Optionally, when performing step S101, the method further includes:
step S301: and adding a defoaming agent into the reaction kettle.
Optionally, before performing step S106, the method further includes:
step S401: judging whether the residual amounts of the polyvinyl acetate and the initiator are less than 20% of the total amount and the total temperature of the reaction kettle is greater than 65 ℃, if so, starting a main stirring shaft for stirring and performing step S106, and if not, directly performing step S103; wherein the bulk temperature is the average of the average temperature and the cooling zone temperature.
Optionally, the emulsifier is alkylphenol ethoxylates.
Optionally, the initiator is potassium persulfate and/or ammonium persulfate.
The invention has the beneficial effects that: 1. in response to the average temperature higher than 80 ℃, the auxiliary stirring shaft is closed and the main stirring shaft is started for stirring for a second time. Therefore, the raw materials in the cooling area with lower temperature are mixed with the raw materials in the reaction area with higher temperature, and the temperature in the reaction area can be effectively reduced. The raw materials in the reaction zone are cooled by the raw materials with lower temperature in the cooling zone, so that the use of cooling water is effectively reduced. 2. In response to the average temperature higher than 80 ℃, the auxiliary stirring shaft is closed and the main stirring shaft is started for stirring for a second time. Therefore, the raw materials in the cooling area with lower temperature are mixed with the raw materials in the reaction area with higher temperature, and the temperature of the cooling area can be effectively increased. The reaction temperature of the raw materials in the cooling zone is ensured, the use of a heater is reduced, and the energy is saved. 3. The invention is provided with a plurality of blade temperature sensors for detecting the temperature of each position of the reaction area and obtaining the average temperature of the blade temperature sensors. Therefore, the accuracy of the temperature of the detected area can be ensured. 4. Vinyl acetate and an initiator are added into the first reaction zone and the third reaction zone, and an auxiliary stirring shaft is started at the same time. Ensures the full contact reaction of the raw materials of the first reaction zone and the third reaction zone. 5. The invention judges whether the residual quantity of polyvinyl acetate and initiator is less than 20% of the total quantity and the total temperature of the reaction kettle is more than 65 ℃, if so, the main stirring shaft is started for stirring. Therefore, the raw materials in the reaction kettle are uniformly mixed at the final stage of the reaction, and the product quality is improved. In conclusion, the reaction kettle is divided into the reaction area and the cooling area, the raw materials in the cooling area are adopted to cool the raw materials in the reaction area, and the raw materials in the reaction area heat the raw materials in the cooling area, so that the temperatures of the reaction area and the cooling area are maintained at the optimal reaction temperature, the use of cooling water is reduced, the energy is saved, and the production efficiency is ensured.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing a wood adhesive according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a front view of a reaction vessel according to an embodiment of the present invention;
fig. 3 is a schematic top view of a reaction vessel according to an embodiment of the present invention.
Detailed Description
The invention discloses a method for manufacturing a wood adhesive, and a person skilled in the art can use the content for reference and appropriately improve the technical details to realize the method. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
In the conventional method for manufacturing the wood adhesive, excessive heat is generated by the reaction of raw materials, the reaction needs to be maintained at a certain temperature, and the reaction efficiency is reduced by overhigh temperature. Therefore, in the prior art, a large amount of cooling water is needed to circulate to cool the reaction kettle, so that the excessive high temperature caused by the reaction of the raw materials is avoided. However, the excessive use of the cooling water causes waste of resources.
Accordingly, an embodiment of the present invention provides a method for manufacturing a wood adhesive, as shown in fig. 1 to 3, the method including:
step S101: adding the polyvinyl alcohol aqueous solution into a reaction kettle.
The reaction kettle is characterized in that two reaction zones and two cooling zones are arranged in the reaction kettle, cooling temperature sensors used for monitoring the temperatures of the cooling zones in real time are arranged in the cooling zones, the reaction zones and the cooling zones are arranged according to the circumference, a first reaction zone, a second cooling zone, a third reaction zone and a fourth cooling zone are sequentially arranged, heaters are arranged on the outer walls of the reaction kettle corresponding to the first reaction zone and the third reaction zone, a main stirring shaft is arranged at the center of the reaction kettle and connected with two auxiliary stirring shafts, at least one rotating blade is arranged on each auxiliary stirring shaft, at least one blade temperature sensor is arranged on each rotating blade, the main stirring shaft drives the auxiliary stirring shafts to rotate, the auxiliary stirring shafts drive the rotating blades to rotate, and the blade temperature sensors are used for monitoring the temperatures of all positions in the reaction kettle.
It should be noted that, the temperature of each position in the reaction zone is monitored by arranging a plurality of blade temperature sensors, and then the average value of the monitored temperature is obtained, so that the accuracy of the temperature can be improved. The problem that the temperature difference is too large due to the influence of a heater or reaction heat release at the part of the reaction zone, so that the overall temperature monitoring of the reaction zone is inaccurate is avoided.
In a specific embodiment, a reaction vessel according to an embodiment of the present invention can be shown in fig. 2 and 3, and includes: the reactor comprises a reactor main body 201, a main stirring shaft 202, an auxiliary stirring shaft 203, rotating blades 204, blade temperature sensors, a first reaction zone 301, a second cooling zone 302, a third reaction zone 303, a fourth cooling zone 304, a cooling temperature sensor 305, a jacket 306 and a heater 307.
As shown in fig. 2, a main stirring shaft 202 is disposed in a main body 201 of the reaction vessel, the main stirring shaft 202 is connected with two auxiliary stirring shafts 203, a plurality of rotating blades 204 are disposed on the auxiliary stirring shafts 203, and a plurality of blade temperature sensors 205 are disposed on the rotating blades 204.
As shown in fig. 3, the first reaction zone 301, the second cooling zone 302, the third reaction zone 303 and the fourth cooling zone 304 are provided in the reaction vessel main body 201, and the respective zones are arranged in the circumferential direction in this order, and such an interval arrangement enables the temperature to be more rapidly equalized during stirring. Cooling temperature sensors 305 are arranged in the second cooling area 302 and the fourth cooling area 304, and jackets 306 are arranged on the outer walls of the reaction kettle corresponding to the second cooling area 302 and the fourth cooling area 304. The first reaction zone 301 and the third reaction zone 303 are provided with a heater 307 on the outer wall of the reaction kettle.
Optionally, before performing step S101, the method further includes:
step S201: dissolving polyvinyl alcohol powder in deionized water to obtain a polyvinyl alcohol aqueous solution.
The deionized water is pure water from which impurities in the form of ions have been removed, and is used to eliminate the influence of the impurity ions in the water on the process of manufacturing the wood adhesive. The polyvinyl alcohol powder can be one or more of PVA2099, PVA2088 and PVA 248. When the polyvinyl alcohol powder is dissolved in the deionized water, the polyvinyl alcohol powder can be properly heated to accelerate the dissolution speed.
Optionally, when performing step S101, the method further includes:
step S301: adding a defoaming agent into the reaction kettle.
It should be noted that the defoaming agent is added to reduce bubbles in the finished wood adhesive.
Step S102: adding an emulsifier into the reaction kettle, and simultaneously starting a main stirring shaft to stir for a first time length; after the stirring for the first time period is finished, stopping the main stirring shaft and enabling the two auxiliary stirring shafts to stay at the central position of the first reaction zone and the central position of the third reaction zone.
The emulsifier is a substance which improves the surface tension between various constituent phases in an emulsion to form a uniform dispersion or emulsion, and can disperse one liquid into another immiscible liquid. When the main stirring shaft is started, the auxiliary stirring shaft is closed, so that the two stirring shafts are prevented from working simultaneously to cause danger. When the main stirring shaft stops, the auxiliary stirring shaft is guaranteed to stay at the central position of the first reaction area and the central position of the third reaction area, so that the vinyl acetate and the initiator can be stirred uniformly through the auxiliary stirring shaft in the following processes of dropwise adding the vinyl acetate into the first reaction area and the third reaction area.
Optionally, the emulsifier is alkylphenol ethoxylates. The alkylphenol polyoxyethylene serves as an emulsifier and has partial defoaming effect.
Step S103: and (3) dropwise adding vinyl acetate and an initiator into the first reaction area and the third reaction area, and simultaneously starting the auxiliary stirring shaft.
The initiator is used to initiate the polymerization of the monomers. In the present example, the addition of initiator to the reaction kettle causes the temperature to increase. The auxiliary stirring shaft is started for uniformly mixing the raw materials in the first reaction zone and the third reaction zone and fully contacting and reacting.
Optionally, the initiator is potassium persulfate and/or ammonium persulfate.
Step S104: obtaining the average temperature of each blade temperature sensor; and judging whether the average temperature is lower than 60 ℃, if so, starting the heater until the average temperature is higher than 60 ℃, and if not, closing the heater.
Alternatively, the reaction in the reaction zone, while generally exothermic, requires a certain initial temperature to begin the reaction. The optimum initial temperature is between 60 and 65 ℃. Therefore, when the average temperature is lower than 60 ℃, the heater needs to be turned on and heated to 60 ℃ so that the raw materials in the reaction zone react. When the temperature is higher than 60 ℃, the reaction proceeds and generates heat, raising the temperature in the reaction vessel.
S105: in response to the average temperature being higher than 80 ℃, closing the auxiliary stirring shaft and opening the main stirring shaft for stirring for a second time period; and after the stirring in the second time period is finished, stopping the main stirring shaft and enabling the two auxiliary stirring shafts to stay at the central position of the first reaction zone and the central position of the third reaction zone.
It should be noted that when the temperature in the reaction zone is higher than 80 ℃, the reaction speed of the raw materials is reduced. The main stirring shaft is turned on so that the high-temperature raw material in the reaction zone and the low-temperature raw material in the cooling zone are mixed. The temperature of the reaction zone is reduced and the temperature of the cooling zone is increased, so that the reaction can be efficiently carried out in the reaction zone and the cooling zone. The temperatures of the high temperature feed and the low temperature feed are relative.
Step S106: and judging whether the residual quantity of the polyvinyl acetate and the initiator exists, if so, returning to the step S103, and otherwise, performing the step S107.
It should be noted that the polyvinyl acetate is slowly added dropwise, and the initiator is added in several portions. The aim of doing so is to avoid the problem that the reaction is too violent in one-time addition, other byproducts are produced, and even the reaction kettle is damaged.
Optionally, before performing step S106, the method further includes:
step S401: judging whether the residual amounts of the polyvinyl acetate and the initiator are less than 20% of the total amount and the total temperature of the reaction kettle is greater than 65 ℃, if so, starting the main stirring shaft for stirring and performing step S106, and if not, directly performing step S103; wherein the bulk temperature is the average of the average temperature and the cooling zone temperature.
It should be noted that when the residual amounts of vinyl acetate and the initiator are less than 20% and the total temperature of the reaction kettle is greater than 65 ℃, which indicates that the temperature difference between the whole reaction zone and the cooling zone is not large, the main stirrer is started to uniformly mix the raw materials in the reaction kettle, so that the raw materials in the reaction kettle are uniformly mixed at the final stage of the reaction, and the product quality is improved.
Step S107: and cooling the reaction kettle, adding sodium bicarbonate water solution and dibutyl phthalate into the reaction kettle in response to the average temperature being lower than 50 ℃, and adjusting the pH value in the reaction kettle.
It should be noted that the wood adhesive produced has the best effect only when the pH value is proper.
Optionally, the cooling the reaction kettle in step S107 includes:
cooling the reaction kettle by injecting cooling water into the jacket; wherein, the jacket is arranged on the outer wall of the reaction kettle corresponding to the cooling area.
In step S107, the raw materials in the reaction vessel are completely reacted, and a jacket is provided outside the cooling zone to prevent the cooling water from affecting the reaction zone.
Alternatively, when the temperature of the cooling zone is too high to integrate the temperature of the reaction zone while performing steps S103 to S106, the temperature of the cooling zone may be reduced by flowing cooling water through the jacket. The cooling water used in this way is also greatly reduced compared to the prior art.
Optionally, in response to the pH value in the reaction kettle being within 6-7, stopping the auxiliary stirring shaft and obtaining the wood adhesive.
Optionally, the wood is discharged and packaged by using an adhesive.
In the embodiment of the invention, in response to the average temperature being higher than 80 ℃, the auxiliary stirring shaft is closed and the main stirring shaft is started for stirring for the second time period. Therefore, the raw materials in the cooling area with lower temperature are mixed with the raw materials in the reaction area with higher temperature, and the temperature in the reaction area can be effectively reduced. The raw materials in the reaction zone are cooled by the raw materials with lower temperature in the cooling zone, so that the use of cooling water is effectively reduced. In the embodiment of the invention, in response to the average temperature being higher than 80 ℃, the auxiliary stirring shaft is closed and the main stirring shaft is started for stirring for the second time period. Therefore, the raw materials in the cooling area with lower temperature are mixed with the raw materials in the reaction area with higher temperature, and the temperature of the cooling area can be effectively increased. The reaction temperature of the raw materials in the cooling zone is ensured, the use of a heater is reduced, and the energy is saved. According to the embodiment of the invention, a plurality of blade temperature sensors are arranged to monitor the temperature of each position of the reaction zone and obtain the average temperature of the blade sensors. Therefore, the accuracy of the temperature of the detected area can be ensured. In the embodiment of the invention, vinyl acetate and an initiator are added into the first reaction zone and the third reaction zone, and the auxiliary stirring shaft is started at the same time. Ensures the full contact reaction of the raw materials of the first reaction zone and the third reaction zone. According to the embodiment of the invention, whether the residual amounts of the polyvinyl acetate and the initiator are less than 20% of the total amount and the total temperature of the reaction kettle is more than 65 ℃ is judged, and if yes, the main stirring shaft is started for stirring. Therefore, the raw materials in the reaction kettle are uniformly mixed at the final stage of the reaction, and the product quality is improved. In summary, the embodiment of the invention divides the inside of the reaction kettle into the reaction zone and the cooling zone, the raw material in the cooling zone is used for cooling the raw material in the reaction zone, and the raw material in the reaction zone is used for heating the raw material in the cooling zone, so as to maintain the temperatures of the reaction zone and the cooling zone at the optimal reaction temperature, reduce the use of cooling water, save energy and ensure the production efficiency.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A method of manufacturing a wood adhesive, the method comprising:
s101, adding a polyvinyl alcohol aqueous solution into a reaction kettle; wherein, two reaction zones and two cooling zones are arranged in the reaction kettle, a cooling temperature sensor for monitoring the temperature of the cooling zones in real time is arranged in the cooling zones, the reaction zone and the cooling zone are arranged circumferentially and sequentially comprise a first reaction zone, a second cooling zone, a third reaction zone and a fourth cooling zone, the outer walls of the reaction kettles corresponding to the first reaction zone and the third reaction zone are provided with heaters, the center of the reaction kettle is provided with a main stirring shaft which is connected with two auxiliary stirring shafts, at least one rotating blade is arranged on the auxiliary stirring shaft, at least one blade temperature sensor is arranged on the rotating blade, the main stirring shaft drives the auxiliary stirring shaft to rotate, the auxiliary stirring shaft drives the rotating blades to rotate, and the blade temperature sensor is used for monitoring the temperature of each position in the reaction kettle in real time;
s102, adding an emulsifier into the reaction kettle, and simultaneously starting the main stirring shaft to stir for a first time length; after the stirring for the first time is carried out, stopping the main stirring shaft and enabling the two auxiliary stirring shafts to stay at the central position of the first reaction zone and the central position of the third reaction zone;
s103, dripping vinyl acetate and an initiator into the first reaction zone and the third reaction zone, and simultaneously starting the auxiliary stirring shaft;
s104, obtaining the average temperature of each blade temperature sensor; judging whether the average temperature is lower than 60 ℃, if so, starting the heater until the average temperature is higher than 60 ℃, and if not, closing the heater;
s105, in response to the fact that the average temperature is higher than 80 ℃, closing the auxiliary stirring shaft and opening the main stirring shaft for stirring for a second time period; after the stirring in the second time period is executed, stopping the main stirring shaft and enabling the two auxiliary stirring shafts to stay at the central position of the first reaction zone and the central position of the third reaction zone;
s106, judging whether residual polyvinyl acetate and the initiator still exist, if so, returning to the step S103, otherwise, performing the step S107;
s107, cooling the reaction kettle, responding to the average temperature lower than 50 ℃, adding a sodium bicarbonate water solution and dibutyl phthalate into the reaction kettle, and adjusting the pH value in the reaction kettle;
and S108, stopping the auxiliary stirring shaft and obtaining the wood adhesive in response to the pH value in the reaction kettle being within 6-7.
2. The method of claim 1, wherein the cooling the reaction vessel in step S107 comprises:
cooling the reaction kettle by injecting cooling water into the jacket; wherein, the jacket is arranged on the outer wall of the reaction kettle corresponding to the cooling area.
3. The method of claim 1, wherein prior to performing step S101, the method further comprises:
step S201: and dissolving polyvinyl alcohol powder in deionized water to obtain the polyvinyl alcohol aqueous solution.
4. The method of claim 1, wherein in performing step S101, the method further comprises:
step S301: and adding a defoaming agent into the reaction kettle.
5. The method of claim 1, wherein prior to performing step S106, the method further comprises:
step S401: judging whether the residual amounts of the polyvinyl acetate and the initiator are less than 20% of the total amount and the total temperature of the reaction kettle is greater than 65 ℃, if so, starting a main stirring shaft for stirring and performing step S106, and if not, directly performing step S103; wherein the bulk temperature is the average of the average temperature and the cooling zone temperature.
6. The method of claim 1, wherein the emulsifier is an alkylphenol ethoxylate.
7. The method of claim 1, wherein the initiator is potassium persulfate and/or ammonium persulfate.
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| CN114891476A (en) * | 2022-06-02 | 2022-08-12 | 中科华宇(福建)科技发展有限公司 | High-water-resistance water-based high-molecular isocyanate wood adhesive and preparation method thereof |
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Denomination of invention: A Method for Manufacturing Wood Adhesive Effective date of registration: 20230801 Granted publication date: 20220311 Pledgee: Putian branch of Industrial Bank Co.,Ltd. Pledgor: ZHONGKE HUAYU (FUJIAN) SCIENCE AND TECHNOLOGY DEVELOPMENT CO.,LTD. Registration number: Y2023980050474 |