阅读说明：本技术 一种环保型无醛粘合剂的制备工艺 (Preparation process of environment-friendly formaldehyde-free adhesive ) 是由 梁超 于 2020-11-30 设计创作，主要内容包括：本发明公开了涉及粘合剂制备领域,具体为一种环保型无醛粘合剂的制备工艺,包括冷凝机构和支撑机构,其特征在于：还包括反应釜、重量反馈机构、注氧机和注水机,所述冷凝机构活动安装在反应釜上端,所述反应釜下端固定连接重量反馈机构,所述重量反馈机构滑动安装在支撑机构上端,所述注氧机和注水机滑动安装在支撑机构侧面。通过以上结构的设置,可以使粘合剂在制备过程中,氧化反应更充分、更易控和更精准。(The invention discloses a preparation technology of an environment-friendly aldehyde-free adhesive, which relates to the field of adhesive preparation, and comprises a condensation mechanism and a supporting mechanism, and is characterized in that: still include reation kettle, weight feedback mechanism, oxygen injection machine and water injection machine, condensation mechanism movable mounting is in the reation kettle upper end, reation kettle lower extreme fixed connection weight feedback mechanism, weight feedback mechanism slidable mounting is in the supporting mechanism upper end, oxygen injection machine and water injection machine slidable mounting are in the supporting mechanism side. Through the arrangement of the structure, the oxidation reaction of the adhesive in the preparation process is more sufficient, easier to control and more accurate.)

1. A preparation process of an environment-friendly aldehyde-free adhesive is characterized by comprising the following steps:

the process comprises the following specific steps:

s1, preparing starch with a certain weight, and preparing an oxidation catalyst, borax, an oxygen scavenger and an aldehyde-free preservative;

s2, adding starch into the reaction kettle (1), starting a stirring mechanism, injecting corresponding water quantity by a water injection mechanism according to the weight of the starch, stirring, and stirring for a certain time;

s3, oxygen is injected into the mixed liquid by the oxygen injection equipment, the mixed liquid is heated and stirred by the stirring mechanism, an oxidation catalyst is added into the mixed liquid, the total weight of the reaction kettle (1) is increased along with the oxidation reaction of the mixed liquid, and when the total weight of the reaction kettle (1) reaches a certain degree, the oxygen injection of the oxygen injection equipment is stopped by the weight feedback mechanism;

s4, adding borax to gelatinize the mixed solution;

s5, adding a deoxidant, stirring for a certain time to consume redundant oxygen in the mixed solution, adding an aldehyde-free preservative, and stirring uniformly to obtain an aldehyde-free adhesive;

s6, stopping heating of the equipment, radiating and cooling through the circulating pipe (1-2) and the movable pipe (3), and taking out the aldehyde-free adhesive through the movable pipe (3) of the reaction kettle (1) after cooling is finished;

the reaction kettle (1) in the S2 comprises a main body (1-1), a circulating pipe (1-2) is fixedly connected below the main body (1-1), and the right end of the circulating pipe (1-2) is communicated with the upper end of the reaction kettle (1);

the upper end of the reaction kettle (1) is fixedly connected with a water injection spiral fan (4-1), fan blades of the water injection spiral fan (4-1) are arranged on the inner side of a main body (1-1) of the reaction kettle (1), a condensation mechanism (2) is arranged at the upper end of the reaction kettle (1), the condensation mechanism (2) completely seals a gap of the reaction kettle (1), and the circulating pipe (1-2) is rotatably connected with an oxygen injection spiral fan (4-2) which is coaxial with the circulating pipe;

reation kettle (1) lower extreme fixed connection supporting disk (5), supporting disk (5) lower extreme is connected with weight feedback mechanism, weight feedback mechanism lower extreme fixed connection supporting mechanism (6), oxygen injection machine (9) and water injection machine (10) are installed in supporting mechanism (6) outside, oxygen injection machine (9) and water injection machine (10) communicate reation kettle (1) respectively, and receive weight feedback mechanism control.

2. The process for preparing the environment-friendly aldehyde-free adhesive according to claim 1, wherein the process comprises the following steps: the right end of the circulating pipe (1-2) is rotatably connected with the movable pipe (3), the upper end of the movable pipe (3) is fixedly connected with the hose (3-1), and the other end of the hose (3-1) is communicated with the upper end of the reaction kettle (1).

3. The process for preparing the environment-friendly aldehyde-free adhesive according to claim 2, wherein: the weight feedback mechanism comprises a supporting disc (5) and a sliding rod (5-1) fixedly connected with the lower end of the supporting disc (5), the sliding rod (5-1) is connected onto a supporting mechanism (6) in a sliding mode, a sliding connection spring (7) is arranged between the sliding rod (5-1) and the supporting mechanism (6), two displacement feedback mechanisms which are identical in structure are installed on the supporting disc (5) and the supporting mechanism (6) in a combined mode, and an oxygen injector (9) and a water injector (10) are installed on the two displacement feedback mechanisms respectively.

4. The process for preparing the environment-friendly aldehyde-free adhesive according to claim 3, wherein the process comprises the following steps: the displacement feedback mechanism comprises a sliding groove (6-1), the sliding groove (6-1) is arranged on the outer side of the supporting mechanism (6), a first rack (5-2) is fixedly connected to the lower end of the supporting plate (5), the first rack (5-2) is in sliding connection with the sliding groove (6-1), gear supports (8) are fixedly connected to the upper ends of the supporting mechanism (6) on the two sides of the sliding groove (6-1), a large gear (8-1) and a small gear (8-2) are connected to the gear supports (8) in a rotating mode, the first rack (5-2) is meshed with the large gear (8-1), the large gear (8-1) is meshed with the small gear (8-2), the small gear (8-2) is meshed with a second rack (9-1), and the second rack (9-1) is fixedly connected with an oxygen injector (9) or a water injector (10) (hereinafter unified The oxygen injector (9) is used for description, the oxygen injector (9) is in sliding connection with a gear support (8), an end switch (9-2) is fixedly mounted at the upper end of a second rack (9-1), a trigger rod (5-3) is arranged right above the end switch (9-2), the trigger rod (5-3) is mounted at the upper end of a support plate (5) in a sliding mode, the trigger rod (5-3) does not descend along with the descending of the support plate (5) before the oxygen injector (9) is started, and descends along with the descending of the support plate (5) after the oxygen injector (9) is started.

5. The process for preparing the environment-friendly aldehyde-free adhesive according to claim 1, wherein the process comprises the following steps: the water injection spiral fan (4-1) and the oxygen injection spiral fan (4-2) are hollow in structure, a large number of small holes (11) are formed in the fan blades, and the holes (11) are communicated with a cavity (12) in the structures of the water injection spiral fan (4-1) and the oxygen injection spiral fan (4-2);

the oxygen injection machine (9) and the water injection machine (10) are respectively communicated with a cavity (12) of the oxygen injection spiral fan (4-2) and the water injection spiral fan (4-1).

6. The process for preparing the environment-friendly aldehyde-free adhesive according to claim 1, wherein the process comprises the following steps: and the fan blades of the water injection spiral fan (4-1) and the oxygen injection spiral fan (4-2) are both provided with heating resistance wires.

Technical Field

The invention relates to the field of adhesive preparation, in particular to a preparation process of an environment-friendly aldehyde-free adhesive.

Background

The adhesive is an indispensable product from daily life to industrial production, the preparation process is a hotspot for many years, the starch adhesive is widely applied to corrugated paper production due to simple manufacture, low material cost and easy acquisition, and formaldehyde pollution can be avoided by using an aldehyde-free preservative.

The existing starch adhesive production process is mainly to oxidize by adding an oxidant and an oxidation catalyst, which causes that the oxidation and precipitation of starch are difficult to control due to uncertain oxygen content in the oxidant, and further causes that the quality of the adhesive is difficult to control; and some manufacturers with high requirements manage and control by detecting the content of the oxidant before each production, and the method is effective, but each detection increases the risk of human errors and the workload.

Based on the above, the invention designs a preparation process of an environment-friendly aldehyde-free adhesive, so as to solve the problems.

Disclosure of Invention

The invention aims to solve the problems that the existing starch adhesive production process is mainly used for oxidation by adding an oxidant and an oxidation catalyst, so that the oxidation and precipitation of starch are difficult to control due to uncertain oxygen content in the oxidant, and the quality of the adhesive is difficult to control; and some manufacturers with high requirements manage and control by detecting the content of the oxidant before each production, and the method is effective, but each detection increases the risk of human errors and also increases the workload.

A preparation process of an environment-friendly aldehyde-free adhesive is characterized by comprising the following steps:

the process comprises the following specific steps:

s1, preparing starch with a certain weight, and preparing an oxidation catalyst, borax, an oxygen scavenger and an aldehyde-free preservative;

s2, adding starch into the reaction kettle, starting a stirring mechanism, injecting corresponding water quantity into the water injection mechanism according to the weight of the starch, stirring, and stirring for a certain time;

s3, oxygen is injected into the mixed liquid by the oxygen injection equipment, the mixed liquid is heated and stirred by the stirring mechanism, at the moment, an oxidation catalyst is put into the mixed liquid, the total weight of the reaction kettle is increased along with the oxidation reaction of the mixed liquid, and when the total weight of the reaction kettle reaches a certain degree, the oxygen injection of the oxygen injection equipment is stopped by the weight feedback mechanism;

s4, adding borax to gelatinize the mixed solution;

s5, adding a deoxidant, stirring for a certain time to consume redundant oxygen in the mixed solution, adding an aldehyde-free preservative, and stirring uniformly to obtain an aldehyde-free adhesive;

s6, stopping heating of the equipment, radiating and cooling through the circulating pipe and the movable pipe, and taking out the aldehyde-free adhesive through the movable pipe of the reaction kettle after cooling is completed;

the reaction kettle in the S2 comprises a main body, wherein a circulating pipe is fixedly connected below the main body, and the right end of the circulating pipe is communicated with the upper end of the reaction kettle;

the upper end of the reaction kettle is fixedly connected with a water injection spiral fan, fan blades of the water injection spiral fan are arranged on the inner side of the main body of the reaction kettle, a condensation mechanism is arranged at the upper end of the reaction kettle, the condensation mechanism completely seals a gap of the reaction kettle, and the circulating pipe is rotationally connected with an oxygen injection spiral fan which is coaxial with the circulating pipe;

the utility model discloses a reaction kettle, including reation kettle lower extreme fixed connection supporting disk, supporting disk lower extreme and weight feedback mechanism are connected, weight feedback mechanism lower extreme fixed connection supporting mechanism, oxygen injection machine and water injection machine are installed to the supporting mechanism outside, oxygen injection machine and water injection machine communicate reation kettle respectively, and receive weight feedback mechanism control.

As a further scheme of the invention, the right end of the circulating connection pipe is rotatably connected with a movable pipe, the upper end of the movable pipe is fixedly connected with a hose, the other end of the hose is communicated with the upper end of the reaction kettle, and the hose is arranged to facilitate the taking out of the adhesive after the preparation is finished.

As a further scheme of the invention, the weight feedback mechanism comprises a slide rod fixedly connected with the lower end of a support plate, the slide rod is connected to the support mechanism in a sliding manner, a spring is connected between the slide rod and the support mechanism in a sliding manner, two displacement feedback mechanisms with the same structure are assembled and installed on the support plate and the support mechanism, an oxygen injector and a water injector are respectively installed on the two displacement feedback mechanisms, the weight variation of the reaction kettle is converted into the displacement variation of the support plate, the oxygen injector and the water injector through the arrangement mode, and the on-off of the oxygen injector and the water injector is controlled through the variation.

As a further scheme of the invention, the displacement feedback mechanism comprises a sliding groove, the sliding groove is arranged at the outer side of a supporting mechanism, the lower end of the supporting plate is fixedly connected with a first rack, the first rack is connected with the sliding groove in a sliding manner, the upper end of the supporting mechanism is fixedly connected with gear supports at two sides of the sliding groove, the gear supports are rotatably connected with a large gear and a small gear, the first rack is meshed with the large gear, the large gear is meshed with the small gear, the small gear is meshed with a second rack, the second rack is fixedly connected with an oxygen injector or a water injector (hereinafter, the oxygen injector is described by using the oxygen injector in a unified manner), the oxygen injector is connected with the gear supports in a sliding manner, the upper end of the second rack is fixedly provided with a stop switch, a trigger rod is arranged right above the stop switch, the trigger rod is slidably arranged at the upper end, the trigger rod can catch up with the oxygen injector or the water injector and trigger a stop switch of the oxygen injector or the water injector after moving along with the supporting disc through the displacement difference, and meanwhile, the setting mode enables the running conditions of the oxygen injector and the water injector to be controlled by a certain proportion that the gravity variation reaches the initial gravity.

As a further scheme of the invention, the water injection spiral fan and the oxygen injection spiral fan are hollow, and a large number of small holes are formed in the fan blades and communicated with cavities in the structures of the water injection spiral fan and the oxygen injection spiral fan;

the oxygen injection machine and the water injection machine are respectively communicated with the cavities of the oxygen injection spiral fan and the water injection spiral fan; so that the water injection or the oxygen injection becomes more uniform and the workload of the subsequent stirring is reduced.

As a further scheme of the invention, the fan blades of the water injection spiral fan and the oxygen injection spiral fan are respectively provided with a heating resistance wire, so that the heating is more uniform, the heat is radiated from the inside, and the heat loss is reduced.

The invention aims to solve the problems that the existing starch adhesive production process is mainly used for oxidation by adding an oxidant and an oxidation catalyst, so that the oxidation and precipitation of starch are difficult to control due to uncertain oxygen content in the oxidant, and the quality of the adhesive is difficult to control; and some manufacturers with high requirements manage and control by detecting the content of the oxidant before each production, and the method is effective, but each detection increases the risk of human errors and also increases the workload.

In order to achieve the purpose, the invention provides the following technical scheme:

when the device is used, the joint of the condensing mechanism and the reaction kettle is firstly opened, and at the moment, the trigger rod is contacted with the stop switch;

then, a certain weight of starch is put into the main body, at the moment, the supporting plate moves downwards under the action of the gravity of the starch, at the moment, a rack I associated with the water injection machine moves downwards, and through the transmission of a corresponding large gear and a corresponding small gear, a rack II on the water injection machine drives the water injection machine to slightly move downwards (the displacement of the supporting plate is reduced and fed back to the water injection machine through the transmission ratio of the gears), and meanwhile, a corresponding trigger rod does not move along with the supporting plate (the weight of the added starch is converted into the distance between the trigger rod and the stop switch);

then starting the equipment, injecting water into the reaction kettle by a water injection spiral fan by a water injection machine, and stirring and heating by the spiral fan to obtain a starch solution; when the trigger rod touches a stop switch, the water injection machine stops injecting water (the mass of injected water is in direct proportion to the mass of starch, the proportional coefficient is controlled by the gear transmission ratio, and further the concentration of the starch solution can be controlled by changing the gear transmission ratio);

after the starch solution is uniformly stirred and heated, adding an oxidation catalyst, injecting oxygen into the starch solution by an oxygen injection screw fan by an oxygen injection machine, carrying out oxidation reaction with the starch along with the oxygen, continuously collecting water vapor generated by a reaction kettle by a condensing mechanism in the oxidation process, continuously increasing the total mass of the reaction kettle, wherein the total mass is the same as the water injection process, and stopping oxygen injection by the oxygen injection machine when the mass of the reaction kettle is increased to a certain proportion of the mass of the starch solution, thus finishing the oxidation reaction;

adding borax to gelatinize the mixed solution, adding a deoxidant after the gelatinization is finished, stirring for a certain time to consume redundant oxygen in the mixed solution, adding an aldehyde-free preservative, and uniformly stirring to obtain an aldehyde-free adhesive; at the moment, the equipment stops heating and carries out circulating cooling through a pipeline of the reaction kettle;

finally, the adhesive is conducted out through a movable tube and a hose.

Compared with the prior art, the invention has the beneficial effects that:

according to the method, the oxidation degree of the starch is related to the weight by directly oxidizing the starch by using oxygen and collecting water vapor, and the oxidation degree is further confirmed by the change of the weight, so that the progress of the oxidation reaction is more intuitively reflected, and the control of the oxidation reaction is changed from the control of the amount of raw materials to the direct control of the progress; the gravity feedback device is constructed, so that the gear transmission ratio is confirmed according to the required starch content and the oxidation degree in the processing process, and then the gear can be produced at will without quantitative determination before each production; the stirring process of the invention is a stirring and circulating flow mode, and the water injection and the oxygen injection are carried out by a stirring fan, so as to strengthen the flow of the solution, and ensure that the starch granules can be distributed more uniformly and the reaction is more complete. In general, the present invention makes the preparation of starch adhesives simpler and makes it easier to produce high quality adhesives.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure

FIG. 2 is a schematic view of the overall structure of the condensation removing mechanism

FIG. 3 is a schematic view of the main structure of the reaction apparatus

FIG. 4 is a schematic diagram of the feedback main structure of the device

FIG. 5 is a cross-sectional view of the general oxygenator with the condensing mechanism removed

FIG. 6 is an enlarged view taken at A in FIG. 5

FIG. 7 is an enlarged view of the portion B in FIG. 5

FIG. 8 is a sectional view of the general water injection machine with the condensing mechanism removed

FIG. 9 is an enlarged view of FIG. 8 at C

FIG. 10 is an enlarged view of FIG. 9 taken at D

In the drawings, the components represented by the respective reference numerals are listed below:

1-reaction kettle, 1-1-main body, 1-2-circulating pipe, 2-condensing mechanism, 3-movable pipe, 3-1-hose, 4-1-water injection screw fan, 4-2-oxygen injection screw fan, 5-supporting disk, 5-1-sliding rod, 5-2-rack I, 5-3-trigger rod, 6-supporting mechanism, 6-1-sliding groove, 7-spring, 8-gear bracket, 8-1-big gear, 8-2-small gear, 9-oxygen injection machine, 9-1-rack II, 9-2-stop switch, 10-water injection machine, 11-hole and 12-cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to solve the problems that the existing starch adhesive production process is mainly used for oxidation by adding an oxidant and an oxidation catalyst, so that the oxidation and precipitation of starch are difficult to control due to uncertain oxygen content in the oxidant, and the quality of the adhesive is difficult to control; and some manufacturers with high requirements manage and control by detecting the content of the oxidant before each production, and the method is effective, but each detection increases the risk of human errors and also increases the workload.

In order to achieve the purpose, the invention provides the following technical scheme:

a preparation process of an environment-friendly aldehyde-free adhesive is characterized by comprising the following steps:

the process comprises the following specific steps:

s1, preparing starch with a certain weight, and preparing an oxidation catalyst, borax, an oxygen scavenger and an aldehyde-free preservative;

s2, adding starch into the reaction kettle 1, starting a stirring mechanism, injecting corresponding water quantity by a water injection mechanism according to the weight of the starch, stirring, and stirring for a certain time;

s3, oxygen is injected into the mixed liquid by the oxygen injection equipment, the mixed liquid is heated and stirred by the stirring mechanism, at the moment, an oxidation catalyst is put into the mixed liquid, the total weight of the reaction kettle 1 is increased along with the oxidation reaction of the mixed liquid, and when the total weight of the reaction kettle 1 reaches a certain degree, the oxygen injection of the oxygen injection equipment is stopped by the weight feedback mechanism;

s4, adding borax to gelatinize the mixed solution;

s5, adding a deoxidant, stirring for a certain time to consume redundant oxygen in the mixed solution, adding an aldehyde-free preservative, and stirring uniformly to obtain an aldehyde-free adhesive;

s6, stopping heating of the equipment, radiating and cooling through the circulating pipe 1-2 and the movable pipe 3, and taking out the aldehyde-free adhesive through the movable pipe 3 of the reaction kettle 1 after cooling is completed;

the reaction kettle 1 in the S2 comprises a main body 1-1, a circulating pipe 1-2 is fixedly connected below the main body 1-1, and the right end of the circulating pipe 1-2 is communicated with the upper end of the reaction kettle 1;

the upper end of the reaction kettle 1 is fixedly connected with a water injection spiral fan 4-1, the fan blades of the water injection spiral fan 4-1 are arranged on the inner side of the main body 1-1 of the reaction kettle 1, the upper end of the reaction kettle 1 is provided with a condensing mechanism 2, the condensing mechanism 2 completely seals the gap of the reaction kettle 1, and the circulating pipe 1-2 is rotatably connected with an oxygen injection spiral fan 4-2 which is coaxial with the circulating pipe 1-2;

1 lower extreme fixed connection supporting disk 5 of reation kettle, 5 lower extremes of supporting disk are connected with weight feedback mechanism, weight feedback mechanism lower extreme fixed connection supporting mechanism 6, oxygen injection machine 9 and water injection machine 10 are installed in the 6 outsides of supporting mechanism, oxygen injection machine 9 and water injection machine 10 communicate reation kettle 1 respectively, and receive weight feedback mechanism control.

As a further scheme of the invention, the right end of the circulating connection pipe 1-2 is rotatably connected with a movable pipe 3, the upper end of the movable pipe 3 is fixedly connected with a hose 3-1, the other end of the hose 3-1 is communicated with the upper end of the reaction kettle 1, and the hose 3-1 is arranged to facilitate the taking out of the adhesive after the preparation of the adhesive.

As a further scheme of the present invention, the weight feedback mechanism comprises a sliding rod 5-1 fixedly connected to the lower end of a supporting plate 5, the sliding rod 5-1 is slidably connected to a supporting mechanism 6, a spring 7 is slidably connected between the sliding rod 5-1 and the supporting mechanism 6, two displacement feedback mechanisms with the same structure are assembled and mounted on the supporting plate 5 and the supporting mechanism 6, an oxygen injector 9 and a water injector 10 are respectively mounted on the two displacement feedback mechanisms, and by the arrangement, the weight variation of the reaction kettle 1 is converted into the displacement variation of the supporting plate 5, the oxygen injector 9 and the water injector 10, and then the on-off of the oxygen injector 9 and the water injector 10 is controlled by the variation.

As a further scheme of the invention, the displacement feedback mechanism comprises a sliding groove 6-1, the sliding groove 6-1 is arranged outside the supporting mechanism 6, the lower end of the supporting plate 5 is fixedly connected with a rack I5-2, the rack I5-2 is in sliding connection with the sliding groove 6-1, the upper end of the supporting mechanism 6 is fixedly connected with gear supports 8 at two sides of the sliding groove 6-1, the gear supports 8 are rotatably connected with a large gear 8-1 and a small gear 8-2, the rack I5-2 is meshed with the large gear 8-1, the large gear 8-1 is meshed with the small gear 8-2, the small gear 8-2 is meshed with a rack II 9-1, the rack II 9-1 is fixedly connected with an oxygen injector 9 or a water injector 10 (hereinafter, the oxygen injector 9 is used for description in a unified manner), the oxygen injector 9 is connected with a gear support 8 in a sliding manner, an end switch 9-2 is fixedly mounted at the upper end of the rack II 9-1, a trigger rod 5-3 is arranged right above the end switch 9-2, the trigger rod 5-3 is mounted at the upper end of a support plate 5 in a sliding manner, the trigger rod 5-3 does not descend along with the descending of the support plate 5 before the oxygen injector 9 is started, the trigger rod 5 descends along with the descending of the support plate 5 after the oxygen injector 9 is started, displacement differences proportional to transmission ratios are generated between the support plate 5 and the oxygen injector 9 and the water injector 10 respectively through transmission ratios of a large gear 8-1 and a small gear 8-2, the trigger rod 5-3 can follow up the oxygen injector 9 or the water injector 10 after moving along with the support plate 5 through the displacement differences and trigger the end switch 9-2 of the oxygen injector 9 or the water injector 10, and the arrangement mode enables the operation conditions of the oxygen injector 9 and the water injector 10 to reach a certain proportion of initial gravity to reach a certain change To control.

As a further scheme of the invention, the water injection spiral fan 4-1 and the oxygen injection spiral fan 4-2 are hollow in structure, a large number of small holes 11 are formed in the fan blades, and the holes 11 are communicated with a cavity 12 in the structures of the water injection spiral fan 4-1 and the oxygen injection spiral fan 4-2;

the oxygen injector 9 and the water injector 10 are respectively communicated with a cavity 12 of the oxygen injection spiral fan 4-2 and the water injection spiral fan 4-1; so that the water injection or the oxygen injection becomes more uniform and the workload of the subsequent stirring is reduced.

As a further scheme of the invention, the fan blades of the water injection spiral fan 4-1 and the oxygen injection spiral fan 4-2 are respectively provided with a heating resistance wire, so that the heating is more uniform, the heat is radiated from the inside, and the heat loss is reduced.

The invention aims to solve the problems that the existing starch adhesive production process is mainly used for oxidation by adding an oxidant and an oxidation catalyst, so that the oxidation and precipitation of starch are difficult to control due to uncertain oxygen content in the oxidant, and the quality of the adhesive is difficult to control; and some manufacturers with high requirements manage and control by detecting the content of the oxidant before each production, and the method is effective, but each detection increases the risk of human errors and also increases the workload.

In order to achieve the purpose, the invention provides the following technical scheme:

when the device is used, the joint of the condensing mechanism 2 and the reaction kettle 1 is firstly opened, and at the moment, the trigger rod 5-3 is contacted with the stop switch 9-2;

then, a certain weight of starch is put into the main body 1-1, at the moment, under the action of the gravity of the starch, the supporting plate 5 moves downwards, at the moment, the rack I5-2 associated with the water injector 10 moves downwards, the rack II 9-1 on the water injector 10 drives the water injector 10 to slightly move downwards (the displacement of the supporting plate 5 is reduced and fed back to the water injector 10 through the transmission ratio of the gear), and meanwhile, the corresponding trigger rod 5-3 does not move along with the supporting plate 5 (the weight of the added starch is converted into the distance between the trigger rod 5-3 and the end switch 9-2);

then starting the device, injecting water into the reaction kettle 1 by a water injection spiral fan 4-1 by a water injection machine 10, and stirring and heating by the spiral fan to obtain a starch solution; along with the starting of the water injection machine 10, the mass of the reaction kettle 1 is increased, the supporting disc 5 moves downwards, the trigger rod 5-3 corresponding to the water injection machine 10 moves downwards along with the downward movement of the supporting disc 5, and when the trigger rod 5-3 touches the stop switch 9-2, the water injection machine 10 stops injecting water (the mass of injected water is in direct proportion to the mass of starch, the proportional coefficient is controlled by the gear transmission ratio, and further the concentration of the starch solution can be controlled by changing the gear transmission ratio);

after the starch solution is uniformly stirred and heated, adding an oxidation catalyst, injecting oxygen into the starch solution by an oxygen injection screw fan 4-2 by an oxygen injection machine 9, wherein the oxidation reaction is carried out along with oxygen and starch, in the oxidation process, water vapor generated by a reaction kettle 1 is continuously collected by a condensing mechanism 2, the total mass of the reaction kettle is continuously increased, the total mass is the same as that of the water injection process, when the mass of the reaction kettle is increased to a certain proportion of the mass of the starch solution, the oxygen injection machine 9 stops injecting oxygen, and the oxidation reaction is finished;

adding borax to gelatinize the mixed solution, adding a deoxidant after the gelatinization is finished, stirring for a certain time to consume redundant oxygen in the mixed solution, adding an aldehyde-free preservative, and uniformly stirring to obtain an aldehyde-free adhesive; at the moment, the equipment stops heating and carries out circulating cooling through the pipeline of the reaction kettle 1;

finally, the adhesive is led out through the movable tube 3 and the hose 3-1.

According to the method, the oxidation degree of the starch is related to the weight by directly oxidizing the starch by using oxygen and collecting water vapor, and the oxidation degree is further confirmed by the change of the weight, so that the progress of the oxidation reaction is more intuitively reflected, and the control of the oxidation reaction is changed from the control of the amount of raw materials to the direct control of the progress; the gravity feedback device is constructed, so that the gear transmission ratio is confirmed according to the required starch content and the oxidation degree in the processing process, and then the gear can be produced at will without quantitative determination before each production; the stirring process of the invention is a stirring and circulating flow mode, and the water injection and the oxygen injection are carried out by a stirring fan, so as to strengthen the flow of the solution, and ensure that the starch granules can be distributed more uniformly and the reaction is more complete. In general, the present invention makes the preparation of starch adhesives simpler and makes it easier to produce high quality adhesives.

In the description herein, references to the terms "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic table of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended merely to assist in the explanation of the invention. The preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.