Environment-friendly water-based adhesive and preparation method thereof

Abstract

The invention relates to the technical field of preparation of environment-friendly water-based adhesives, and discloses an environment-friendly water-based adhesive and a preparation method thereof.The environment-friendly water-based adhesive is prepared from polyvinyl acetate emulsion, acrylate copolymer, water, xanthan gum, phenoxyethanol and a pH modifier, S1, the polyvinyl acetate emulsion, the acrylate copolymer and the water are evenly mixed through a stirring assembly; s2, xanthan gum and phenoxyethanol are added through a feeding pipe; s3, adding a pH regulator to enable the pH of the adhesive to be 6-8; s4, continuously stirring until a uniform adhesive solution is formed; s5, a scraping assembly is used for cleaning; s6, a filtering assembly is used for filtering to remove impurities in the adhesive solution, and a final product is obtained.The environment-friendly water-based adhesive is superior to a contrast sample in the aspects of initial bonding force, drying speed, water resistance, biodegradation rate and the like, compared with a traditional solvent type adhesive, the environment-friendly water-based adhesive is free of pungent smell in the using process, and the environment-friendly water-based adhesive is environmentally friendly and free of pollution to the environment. The environment-friendly requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly water-based adhesive preparation, and in particular to an environmentally friendly water-based adhesive and a preparation method thereof. Background Art

[0002] Water-based adhesives are environmentally friendly adhesives made from natural or synthetic polymers and water as solvent or dispersant, replacing toxic organic solvents that pollute the environment. The main advantages are non-toxicity, no pollution, no combustion, safe use, easy to achieve clean production processes, etc. The disadvantages include slow drying speed, poor water resistance, and poor antifreeze properties.

[0003] Traditional solvent-based adhesives have been widely used in industrial production, but they often produce pungent odors during use, and the emission of harmful solvents causes serious environmental pollution. In addition, traditional solvent-based adhesives also have certain limitations in terms of initial adhesion, drying speed, water resistance, etc., and it is difficult to meet the needs of modern industrial production for high-performance adhesives. Therefore, an environmentally friendly water-based adhesive and a preparation method thereof are proposed. Summary of the invention

[0004] The object of the present invention is to provide an environmentally friendly water-based adhesive and a preparation method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an environmentally friendly water-based adhesive, comprising polyvinyl acetate emulsion, acrylate copolymer, water, xanthan gum, phenoxyethanol and a pH regulator;

[0006] The composition weight ratio is:

[0007] Polyvinyl acetate emulsion: 55-65 parts;

[0008] Acrylate copolymer: 12-29 parts;

[0009] Water: 20-40 parts;

[0010] Xanthan gum: 1-5 parts;

[0011] Phenoxyethanol: 0.1-1 part;

[0012] pH adjuster: 0.1-20 parts.

[0013] The present invention also provides a method for preparing an environmentally friendly water-based adhesive, comprising the following steps:

[0014] S1. Mixing polyvinyl acetate emulsion, acrylate copolymer and water uniformly using a stirring component;

[0015] S2, adding xanthan gum and phenoxyethanol through the feeding tube;

[0016] S3, adding a pH regulator to make the pH of the adhesive 6-8;

[0017] S4. Continue stirring until a uniform adhesive solution is formed;

[0018] S5. Cleaning using a scraping assembly;

[0019] S6. Use a filtering component to filter and remove impurities in the adhesive solution to obtain a final product.

[0020] Preferably, the stirring assembly comprises a tank body, a rotating shaft is rotatably connected to the top axis of the tank body via a sealed bearing, a plurality of stirring blades are fixed to the outer side of the bottom of the rotating shaft, and a motor is fixed to the top of the tank body.

[0021] Preferably, a second conical tooth is fixed to the output shaft end of the motor, and the second conical tooth is meshingly connected with a first conical tooth fixed at the axis center of the top of the rotating shaft.

[0022] Preferably, the scraping assembly comprises a support frame, a cylinder is fixed to one side of the top of the support frame, a push rod end of the cylinder is rotatably connected to a slide rod via a bearing, and a limiting block is fixed to the bottom of the slide rod.

[0023] Preferably, a first sliding groove seamlessly slidably connected to the outside of the sliding rod is provided inside the rotating shaft, a limiting block is fixed on one side of the sliding rod, and a first connecting rod is hinged on one side of the limiting block.

[0024] Preferably, a fixing frame is fixed to one side of the rotating shaft, a second sliding groove is opened on one side of the fixing frame, a second connecting rod is slidably connected to the inner side of the second sliding groove, and a scraper is fixed to one side of the second connecting rod.

[0025] Preferably, one end of the bottom of the first connecting rod is hinged to one side of the top of the second connecting rod, and the bottom of the support frame is fixed to one side of the top of the tank body.

[0026] Preferably, the filter assembly comprises a box body, a filter screen is inserted into one side of the box body, a vertical plate is fixed to one side of the filter screen, one side of the vertical plate is connected to one side of the box body by bolts, and a limit frame located at the lower side of the filter screen is fixed to the inner wall of the box body.

[0027] Preferably, a discharge hole connected to the box body is provided at the bottom of the inner wall of the tank body, the bottom of the tank body is fixed to the top of the box body, a feeding pipe is installed on one side of the top of the tank body, and a discharge pipe is installed on one side of the bottom of the box body, and valves are installed on the discharge pipe and the discharge hole.

[0028] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0029] 1. The environmentally friendly water-based adhesive provided by the present invention is superior to the comparative samples in terms of initial adhesion, drying speed, water resistance and biodegradation rate. Compared with traditional solvent-based adhesives, the environmentally friendly water-based adhesive of the present invention has no irritating odor during use and is more in line with environmental protection requirements. The adhesive not only meets the needs of industrial production, but also meets modern environmental protection standards and has broad application prospects.

[0030] 2. The present invention adopts a water-based system, which reduces the emission of harmful solvents and reduces environmental pollution compared to traditional solvent-based adhesives. The selected raw materials such as polyvinyl acetate emulsion, acrylate copolymer, xanthan gum, etc. are all environmentally friendly materials with little impact on the human body and the environment. The pH adjusters are organic acids and organic bases, which avoid the pollution problems that may be caused by inorganic ions.

[0031] 3. The environmentally friendly water-based adhesive of the present invention has excellent viscosity, solid content, bonding strength and pH range, meeting the needs of industrial production. Compared with common adhesives on the market, it performs well in initial bonding strength, drying speed, water resistance and biodegradability, and has higher application value.

[0032] Fourth, the second conical tooth is driven to rotate by the motor output shaft, and then the first conical tooth and multiple stirring blades on the rotating shaft are driven to rotate, which can ensure that the raw materials are fully stirred inside the tank body, thereby achieving uniform mixing of the raw materials, helping to improve the performance of the adhesive and ensuring that various ingredients can fully play their role.

[0033] 5. By controlling the push rod end of the cylinder to extend, a series of mechanical transmissions such as the sliding rod, the limit block, the first connecting rod and the second connecting rod are pushed, and finally the scraper is tightly pressed against the inner wall of the tank. This can ensure that the scraper is driven by the motor to perform efficient cleaning operations along the inner wall of the tank and quickly scrape off residual adhesive.

[0034] 6. By filtering the adhesive through the filter, impurities can be effectively removed, improving the purity and quality of the adhesive. When a large amount of impurities are blocked on the top of the filter, the vertical plate and the filter can be removed through simple operations, and then replaced with a new filter, making the replacement of the filter convenient and quick, reducing maintenance costs and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0037] Figure 2 It is a schematic diagram of the structure of the second viewing angle of the present invention;

[0038] Figure 3 It is a schematic diagram of the structure of the conical gear meshing part of the present invention;

[0039] Figure 4 It is a schematic diagram of the structure of the stirring blade of the present invention;

[0040] Figure 5 It is a schematic diagram of the cross-sectional structure of the fixing frame of the present invention.

[0041] Explanation of the reference numerals: 1. stirring assembly; 11. tank body; 12. rotating shaft; 13. motor; 14. first conical teeth; 15. second conical teeth; 16. stirring blades; 2. scraping assembly; 21. support frame; 22. cylinder; 23. slide rod; 24. fixed frame; 25. first connecting rod; 26. second connecting rod; 27. scraper; 28. limit block; 29. ​​first slide chute; 210. second slide chute; 3. feeding pipe; 4. discharge pipe; 5. filtering assembly; 51. box body; 52. vertical plate; 53. limit frame; 54. filter screen; 6. discharge hole. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0044] Example

[0045] See also Figure 1-5 , the present invention provides a technical solution: an environmentally friendly water-based adhesive, comprising polyvinyl acetate emulsion, acrylate copolymer, water, xanthan gum, phenoxyethanol and a pH regulator;

[0046] The weight ratio of the components is: polyvinyl acetate emulsion: 60 parts; acrylate copolymer: 22 parts; water: 30 parts; xanthan gum: 3 parts; phenoxyethanol: 0.9 parts; pH adjuster: 6 parts, the pH adjuster is organic acid and organic base;

[0047] The organic acid may be acetic acid or citric acid, which can not only effectively adjust the pH value, but also are relatively mild, easy to handle, and have little impact on the environment and human body;

[0048] The organic base may be triethanolamine or dimethylethanolamine. The organic base may provide a stable pH adjustment effect while avoiding the pollution problem that may be caused by the introduction of inorganic ions.

[0049] The present invention also provides a method for preparing an environmentally friendly water-based adhesive, comprising the following steps:

[0050] S1, mixing polyvinyl acetate emulsion, acrylate copolymer and water uniformly using stirring component 1;

[0051] S2, adding xanthan gum and phenoxyethanol through feeding tube 3;

[0052] S3, adding a pH regulator to make the pH of the adhesive 6-8;

[0053] S4. Continue stirring until a uniform adhesive solution is formed;

[0054] S5, using the scraping component 2 to clean;

[0055] S6. Use the filtering component 5 to filter and remove impurities in the adhesive solution to obtain a final product.

[0056] The test results of environmentally friendly water-based adhesives are as follows:

[0057] Viscosity: 5000-8000mPa·s; solid content: 45-55%; bonding strength: ≥2MPa; pH value: 6-8.

[0058] The following key tests were conducted on the performance of the product of the present invention, and compared with several common adhesives on the market. The comparison data are as follows:

[0059] Test items Adhesive of the present invention Comparison glue A Comparison glue B <![CDATA[Initial adhesion force (N / cm 2 )]]> 120 95 110 Drying speed (min) 15 20 25 Water resistance (h) ＞240 120 180 Biodegradation rate (%) 90 50 70

[0060] It can be seen from the above comparison data that the environmentally friendly water-based adhesive provided by the present invention is superior to the comparative sample in terms of initial adhesion, drying speed, water resistance and biodegradability.

[0061] Compared with traditional solvent-based adhesives, the environmentally friendly water-based adhesive of the present invention has no irritating odor during use and is more in line with environmental protection requirements. The adhesive not only meets the needs of industrial production, but also meets modern environmental protection standards and has broad application prospects.

[0062] The present invention adopts a water-based system, which reduces the emission of harmful solvents and reduces pollution to the environment compared to traditional solvent-based adhesives. The selected raw materials such as polyvinyl acetate emulsion, acrylate copolymer, xanthan gum, etc. are all environmentally friendly materials with little impact on the human body and the environment. The pH adjusters are organic acids and organic bases, which avoid the pollution problems that may be caused by inorganic ions.

[0063] The environmentally friendly water-based adhesive of the present invention has excellent viscosity, solid content, bonding strength and pH value range, meeting the needs of industrial production. Compared with common adhesives on the market, it has excellent performance in initial bonding strength, drying speed, water resistance and biodegradability, and has higher application value.

[0064] In order to facilitate stirring of the adhesive, a stirring component 1 is provided, which includes a tank body 11. A rotating shaft 12 is rotatably connected to the top axis of the tank body 11 through a sealed bearing. A plurality of stirring blades 16 are fixed to the outer side of the bottom of the rotating shaft 12. A motor 13 is fixed to the top of the tank body 11. A second conical tooth 15 is fixed to the output shaft end of the motor 13. The output shaft of the motor 13 drives the second conical tooth 15 to rotate. At this time, the second conical tooth 15 is meshed and connected with the first conical tooth 14, so that the first conical tooth 14 drives the rotating shaft 12 and the plurality of stirring blades 16 at the bottom to rotate. The second conical tooth 15 is meshed and connected with the first conical tooth 14 fixed at the top axis of the rotating shaft 12. The stirring blades 16 stir the raw materials added to the inside of the tank body 11.

[0065] In order to facilitate the cleaning of the adhesive remaining on the inner wall of the tank body 11, a scraping assembly 2 is provided, which includes a support frame 21, a cylinder 22 is fixed on one side of the top of the support frame 21, and the push rod end of the cylinder 22 is rotatably connected to a slide rod 23 through a bearing. The push rod end of the cylinder 22 extends, and the push rod end pushes the slide rod 23 to slide downward inside the first slide groove 29. At this time, the slide rod 23 pushes the limit block 28 to move downward, and the limit block 28 is fixed at the bottom of the slide rod 23. A first slide groove 29 seamlessly slidably connected to the outside of the slide rod 23 is opened inside the rotating shaft 12, a limit block 28 is fixed on one side of the slide rod 23, a first connecting rod 25 is hinged on one side of the limit block 28, and a fixing frame is fixed on one side of the rotating shaft 12. 24, a second slide groove 210 is opened on one side of the fixing frame 24, and a second connecting rod 26 is slidably connected to the inner side of the second slide groove 210, and a scraper 27 is fixed on one side of the second connecting rod 26. The limit block 28 pushes the first connecting rod 25 to move obliquely downward, and the first connecting rod 25 pushes the second connecting rod 26 to slide on the inner side of the second slide groove 210. At this time, the second connecting rod 26 pushes the scraper 27 to move toward the inner wall side of the tank body 11, and one end of the bottom of the first connecting rod 25 is hinged to the top side of the second connecting rod 26. The bottom of the support frame 21 is fixed to the top side of the tank body 11, and the scraper 27 is in contact with the inner wall of the tank body 11. The scraper 27 cleans the inner wall of the tank body 11 and scrapes off the residual adhesive.

[0066] The filter assembly 5 includes a box body 51, a filter screen 54 is inserted into one side of the box body 51, a vertical plate 52 is fixed to one side of the filter screen 54, the adhesive passes through the filter screen 54 to filter it, and impurities in the adhesive are blocked at the top of the filter screen 54, one side of the vertical plate 52 is connected to one side of the box body 51 by bolts, a limit frame 53 located at the lower side of the filter screen 54 is fixed to the inner wall of the box body 51, a discharge hole 6 connected to the box body 51 is opened at the bottom of the inner wall of the tank body 11, the bottom of the tank body 11 is fixed to the top of the box body 51, and a feeding pipe 3 is installed on one side of the top of the tank body 11 to discharge the adhesive inside the box body 51. When a large amount of impurities are blocked at the top of the filter screen 54, the bolts on one side of the vertical plate 52 are removed, the vertical plate 52 and the filter screen 54 are taken out, and a new filter screen 54 is taken out and inserted into one side of the box body 51, and a discharge pipe 4 is installed on one side of the bottom of the box body 51, and valves are installed on the discharge pipe 4 and the discharge hole 6.

[0067] Working principle: raw materials are added into the inner side of the tank body 11 in sequence through the feeding pipe 3, and then the motor 13 is started, and the output shaft of the motor 13 drives the second conical gear 15 to rotate, and at this time the second conical gear 15 is meshed and connected with the first conical gear 14, so that the first conical gear 14 drives the rotating shaft 12 and the multiple stirring blades 16 at the bottom to rotate, and at this time the stirring blades 16 stir the raw materials added into the tank body 11, and after the stirring is completed, the valve on the discharge hole 6 is opened, so that the stirred adhesive enters the inner side of the box body 51 through the discharge hole 6;

[0068] The push rod end of the control cylinder 22 extends out, and the push rod end pushes the slide bar 23 to slide downward inside the first slide groove 29. At this time, the slide bar 23 pushes the limit block 28 to move downward, and the limit block 28 pushes the first connecting rod 25 to move obliquely downward. The first connecting rod 25 pushes the second connecting rod 26 to slide inside the second slide groove 210. At this time, the second connecting rod 26 pushes the scraper 27 to move toward the inner wall of the tank body 11. At this time, the output shaft of the motor 13 is still controlled to rotate, so that the rotating shaft 12 drives the fixing frame 24 to rotate. At this time, the scraper 27 is in contact with the inner wall of the tank body 11, and the scraper 27 cleans the inner wall of the tank body 11 to scrape off the residual adhesive;

[0069] At this time, the adhesive is filtered through the filter screen 54, and the impurities in the adhesive are blocked at the top of the filter screen 54. Then, the valve on the discharge pipe 4 is opened to discharge the adhesive inside the box 51. When a large amount of impurities are blocked on the top of the filter screen 54, the bolts on one side of the vertical plate 52 are removed, the vertical plate 52 and the filter screen 54 are taken out, and a new filter screen 54 is taken out and inserted into one side of the box 51. With the support of the limit frame 53, the filter screen 54 is located on the inner side of the box 51 to continue filtering the adhesive.

[0070] In summary, the output shaft of the motor 13 drives the second conical teeth 15 to rotate, and then drives the first conical teeth 14 and the multiple stirring blades 16 on the rotating shaft 12 to rotate, which can ensure that the raw materials are fully stirred inside the tank body 11, thereby achieving uniform mixing of the raw materials, which helps to improve the performance of the adhesive and ensure that various components can fully play their role;

[0071] By controlling the push rod end of the cylinder 22 to extend, a series of mechanical transmissions such as the slide rod 23, the limit block 28, the first connecting rod 25 and the second connecting rod 26 are pushed, and finally the scraper 27 is tightly pressed against the inner wall of the tank body 11, which can ensure that the scraper 27, driven by the motor 13, can perform efficient cleaning operations along the inner wall of the tank body 11 and quickly scrape off the residual adhesive.

[0072] By filtering the adhesive through the filter 54, impurities therein can be effectively removed, thereby improving the purity and quality of the adhesive. When a large amount of impurities are blocked at the top of the filter 54, the vertical plate 52 and the filter 54 can be removed through simple operations, and then a new filter 54 can be replaced, making the replacement of the filter 54 convenient and quick, thereby reducing maintenance costs and time.

[0073] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. An environmentally friendly water-based adhesive, characterized in that: It comprises polyvinyl acetate emulsion, acrylate copolymer, water, xanthan gum, phenoxyethanol and pH regulator; The composition weight ratio is: Polyvinyl acetate emulsion: 55-65 parts; Acrylate copolymer: 12-29 parts; Water: 20-40 parts; Xanthan gum: 1-5 parts; Phenoxyethanol: 0.1-1 part; pH adjuster: 0.1-20 parts.

2. The method for preparing an environmentally friendly water-based adhesive according to claim 1, characterized in that: The following steps are involved: S1, mixing the polyvinyl acetate emulsion, the acrylic acid ester copolymer and water uniformly using a stirring component (1); S2, adding xanthan gum and phenoxyethanol through the feeding tube (3); S3, adding a pH regulator to make the pH of the adhesive 6-8; S4. Continue stirring until a uniform adhesive solution is formed; S5, using the scraping component (2) for cleaning; S6. Use the filtering component (5) to filter and remove impurities in the adhesive solution to obtain a final product.

3. The method for preparing an environmentally friendly water-based adhesive according to claim 2, characterized in that: The stirring assembly (1) comprises a tank body (11), wherein a rotating shaft (12) is rotatably connected to the top axis of the tank body (11) via a sealed bearing, a plurality of stirring blades (16) are fixed to the outer side of the bottom of the rotating shaft (12), and a motor (13) is fixed to the top of the tank body (11).

4. The method for preparing an environmentally friendly water-based adhesive according to claim 3, characterized in that: A second conical tooth (15) is fixed to the output shaft end of the motor (13), and the second conical tooth (15) is meshedly connected with a first conical tooth (14) fixed at the top axis of the rotating shaft (12).

5. The method for preparing an environmentally friendly water-based adhesive according to claim 4, characterized in that: The scraping assembly (2) comprises a support frame (21), a cylinder (22) is fixed on one side of the top of the support frame (21), a push rod end of the cylinder (22) is rotatably connected to a slide rod (23) via a bearing, and a limiting block (28) is fixed at the bottom of the slide rod (23).

6. The method for preparing an environmentally friendly water-based adhesive according to claim 5, characterized in that: A first sliding groove (29) is provided inside the rotating shaft (12) and is seamlessly slidably connected to the outside of the sliding rod (23). A limiting block (28) is fixed on one side of the sliding rod (23), and a first connecting rod (25) is hinged on one side of the limiting block (28).

7. The method for preparing an environmentally friendly water-based adhesive according to claim 6, characterized in that: A fixing frame (24) is fixed on one side of the rotating shaft (12), a second sliding groove (210) is opened on one side of the fixing frame (24), a second connecting rod (26) is slidably connected inside the second sliding groove (210), and a scraper (27) is fixed on one side of the second connecting rod (26).

8. The method for preparing an environmentally friendly water-based adhesive according to claim 7, characterized in that: One end of the bottom of the first connecting rod (25) is hinged to one side of the top of the second connecting rod (26), and the bottom of the support frame (21) is fixed to one side of the top of the tank body (11).

9. The method for preparing an environmentally friendly water-based adhesive according to claim 8, characterized in that: The filter assembly (5) comprises a box body (51), a filter screen (54) is inserted into one side of the box body (51), a vertical plate (52) is fixed to one side of the filter screen (54), one side of the vertical plate (52) is connected to one side of the box body (51) by bolts, and a limiting frame (53) located at the lower side of the filter screen (54) is fixed to the inner wall of the box body (51).

10. The method for preparing an environmentally friendly water-based adhesive according to claim 9, characterized in that: The inner wall bottom of the tank body (11) is provided with a discharge hole (6) connected to the box body (51); the bottom of the tank body (11) is fixed to the top of the box body (51); a feeding pipe (3) is installed on one side of the top of the tank body (11); a discharge pipe (4) is installed on one side of the bottom of the box body (51); valves are installed on the discharge pipe (4) and the discharge hole (6).

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