Efficient polyvinyl alcohol gel preparation method
By optimizing reaction conditions and simplifying operating steps, an efficient polyvinyl alcohol gel preparation method was adopted to solve the problems of complex operations, low efficiency and unstable product quality in traditional methods, and achieve efficient, economical and reliable gel preparation. Suitable for industrial scale production and strict application areas.
Patent Information
- Application Number
- CN202411678497.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-01-21
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The preparation method of traditional polyvinyl alcohol (PVA) gel is complex, difficult to operate, low production efficiency, and unstable product quality, which limits its promotion in industrial-scale production and certain application fields.
Adopt an efficient polyethylene gel preparation method, through optimization of reaction conditions and simplified operation steps, including preset ratios called raw materials, controlling heating and stirring process, accurately adjusting the pH value and temperature, forming a uniform coal structure. And solidify and perform post -treatment in low temperature environments.
It significantly improves production efficiency, ensures the uniformity and structural stability of gel, reduces the dependence of energy consumption and operating skills, reduces production costs, improves the consistency and quality of the product. use.
Smart Images
Figure CN119331272A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of polymer chemical materials, and in particular to an efficient method for preparing polyvinyl alcohol gel. Background Art
[0002] Polyvinyl alcohol (PVA) gel is widely used in many fields such as medicine, biomaterials, cosmetics and environmental protection due to its excellent physical and chemical properties. The traditional preparation method of PVA gel involves complex chemical reactions, including multi-step cross-linking and thickening processes, which often require precise temperature and pH control, as well as strict stirring and processing conditions. However, these preparation methods have problems such as complex operation, long time consumption, high cost and difficult to control product quality. Especially in industrial-scale production, these problems are more prominent, seriously affecting the production efficiency and application promotion of PVA gel products.
[0003] In the prior art, the efficiency and product quality of the preparation process of PVA gel are restricted by many factors, such as imprecise control of reaction conditions, unreasonable raw material addition steps and insufficient post-processing process, etc. These problems lead to instability of product performance. In addition, the low-temperature curing step and complex post-processing requirements in the traditional method further increase the production cost, limiting the application of PVA gel in certain fields.
[0004] Therefore, developing a new PVA gel preparation method that can simplify the preparation steps, optimize the control of raw materials and reaction conditions, reduce production costs, and improve product consistency and quality is a technical problem that urgently needs to be solved in the current research and application of PVA gel. Summary of the invention
[0005] Based on the above purpose, the present invention provides an efficient method for preparing polyvinyl alcohol gel.
[0006] An efficient method for preparing polyvinyl alcohol gel comprises the following steps: S1: weighing polyvinyl alcohol powder, a first cross-linking agent, a second cross-linking agent, a thickener, a pH adjuster and a solvent according to a preset ratio; S2: adding polyvinyl alcohol powder to a pre-weighed solvent, heating and continuously stirring to form a uniform polyvinyl alcohol solution; S3: After the polyvinyl alcohol solution is cooled to a predetermined temperature, a pre-weighed thickener is gradually added and stirred continuously until it is completely dissolved to form a mixed solution A; S4: After the mixed solution A is cooled, the first cross-linking agent and the second cross-linking agent are added in sequence, and the mixture is stirred and mixed to form a mixed solution B; S5: adding a pH adjuster to the mixed solution B to adjust the pH to a predetermined pH range for gel formation; S6: leaving the mixed solution B with adjusted pH value to stand at room temperature to allow the polyvinyl alcohol to react with the cross-linking agent to form a gel structure; S7: transferring the formed gel to a low temperature environment for solidification treatment; S8: Post-processing the solidified gel, including drying, cutting and morphology adjustment, to obtain the final polyvinyl alcohol gel product.
[0007] Optionally, the proportions of the raw materials in S1 are: polyvinyl alcohol powder 8%-15%; first cross-linking agent 1%-3%; second cross-linking agent 0.5%-2%; thickener 0.5%-2%; pH adjuster 0.1%-0.5%; solvent 77.5%-89.9%.
[0008] Optionally, the first cross-linking agent is glutaraldehyde, glyoxal or epichlorohydrin; the second cross-linking agent is sodium silicate, potassium aluminum sulfate or zinc sulfate; the thickener is hydroxypropyl methylcellulose, carboxymethyl cellulose or xanthan gum; the pH adjuster is citric acid, acetic acid or sodium dihydrogen phosphate; and the solvent is deionized water, ethanol or propylene glycol.
[0009] Optionally, the S2 specifically includes: S21: placing a pre-weighed amount of solvent in a stirring container and heating it to 60° C. to 80° C.; S22: While keeping the temperature of the solvent stable, gradually add the pre-weighed polyvinyl alcohol powder, and control the addition rate to 1%-5% of the solvent volume per minute; S23: During the process of adding the polyvinyl alcohol powder, stirring is continued, and the stirring speed is controlled to be 200 rpm to 400 rpm; S24: After the polyvinyl alcohol powder is completely added, gradually increase the solution temperature to 80° C. to 95° C., and adjust the stirring speed to 400 rpm to 600 rpm until the polyvinyl alcohol is completely dissolved.
[0010] Optionally, the S3 specifically includes: S31: Cooling the polyvinyl alcohol solution formed in S2 to 40° C. to 60° C.; S32: While keeping the solution temperature stable, gradually add the pre-weighed thickener at a rate of 1%-3% of the solution volume per minute; S33: During the thickener addition process, the stirring speed is maintained at 300 rpm to 500 rpm, and the stirring is continued until the thickener is completely dissolved and uniformly mixed with the polyvinyl alcohol solution to form a mixed solution A.
[0011] Optionally, the S4 specifically includes: S41: Cooling the mixed solution A formed in S3 to 30° C. to 40° C.; S42: while keeping the temperature of the mixed solution A stable, gradually adding the pre-weighed first cross-linking agent, and maintaining the stirring speed at 200 rpm to 400 rpm; S43: After the first cross-linking agent is completely added and evenly distributed, the pre-weighed second cross-linking agent is gradually added, and the stirring speed is maintained at 200 rpm to 400 rpm until the second cross-linking agent is fully mixed with the mixed solution A to form a mixed solution B.
[0012] Optionally, the S5 specifically includes: S51: After the mixed solution B is formed, the initial pH value of the solution is measured using a pH meter to understand the current pH value of the solution; S52: according to the preliminary pH measurement result, gradually adding a pre-weighed pH adjuster, while maintaining a stirring speed of 100 rpm to 300 rpm, and adding the pH adjuster while stirring until the pH value of the solution reaches a predetermined range of 4 to 6; S53: After the pH value of the solution reaches a predetermined value, continue stirring for 5 to 10 minutes to ensure that the pH value is uniform and stable.
[0013] Optionally, the S6 specifically includes: S61: Move the mixed solution B with the pH value adjusted in S5 into a stable container, and ensure that the surface of the solution in the container is flat; S62: Place the container at room temperature of 20°C to 25°C and keep the solution still; S63: Keep the solution standing for 2 to 4 hours to allow the polyvinyl alcohol and the cross-linking agent to fully react during this period to form a uniform gel structure.
[0014] Optionally, the S7 specifically includes: S71: After the gel is formed, remove it from the resting container and transfer it to a clean tray; S72: placing the tray loaded with gel in an environment of 4°C to 10°C for precooling for 30 to 60 minutes; S73: The pre-cooled gel is transferred to a low temperature environment of -10°C to -20°C for curing. The curing time is controlled within 12 to 24 hours to form a stable gel structure.
[0015] Optionally, the S8 specifically includes: S81: taking the solidified gel out of the low temperature environment and immediately transferring it to a drying device for drying at a temperature of 40°C to 60°C for 4 to 8 hours until the water content of the gel drops below 5%; S82: moving the dried gel to a cutting table and cutting it according to predetermined specifications, with the cutting thickness controlled to be between 0.5 mm and 2 mm; S83: Adjusting the shape of the cut gel, including removing corners, smoothing the surface, and shaping the gel using a mold to obtain a final polyvinyl alcohol gel product.
[0016] Beneficial effects of the present invention: The present invention significantly improves production efficiency by optimizing reaction conditions and simplifying operation steps. By accurately controlling the addition of cross-linking agent and thickener, and systematically adjusting pH value and temperature, the method can complete the preparation of gel in a shorter time while ensuring the uniformity and structural stability of the gel. This improvement not only reduces energy consumption, but also reduces dependence on operating skills, making the gel preparation process more economical and reliable.
[0017] The present invention, by curing in a low temperature environment and accurately controlling the drying and cutting processes, finally obtains a polyvinyl alcohol gel having better physical properties and higher production consistency. This improvement makes the PVA gel of the present invention more suitable for use in demanding application fields, such as biomedicine and environmental engineering, thereby expanding its market application range. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the present invention or 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 in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 This is a schematic diagram of a method for preparing polyvinyl alcohol gel according to an embodiment of the present invention; Figure 2 Schematic diagram of the components of the polyvinyl alcohol gel according to an embodiment of the present invention. DETAILED DESCRIPTION
[0020] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.
[0021] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).
[0022] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.
[0023] Example 1 like Figure 1-Figure 2 As shown, an efficient method for preparing polyvinyl alcohol gel comprises the following steps: S1: weighing polyvinyl alcohol (PVA) powder, a first cross-linking agent, a second cross-linking agent, a thickener, a pH regulator and a solvent according to a preset ratio, ready for a subsequent preparation process; S2: Add the polyvinyl alcohol powder to the pre-weighed solvent, heat and stir continuously to ensure that the PVA is completely dissolved to form a uniform polyvinyl alcohol solution; S3: After the polyvinyl alcohol solution is cooled to a predetermined temperature, a pre-weighed thickener is gradually added and stirred continuously until it is completely dissolved to form a mixed solution A; S4: After the mixed solution A is cooled, the first cross-linking agent and the second cross-linking agent are added in sequence, and the mixture is stirred and mixed continuously to ensure that the two cross-linking agents are fully mixed and evenly dispersed in the solution to form a mixed solution B; S5: adding a pH adjuster to the mixed solution B to adjust the pH to a predetermined pH range for gel formation; S6: leaving the mixed solution B with adjusted pH value to stand at room temperature to allow the polyvinyl alcohol to react with the cross-linking agent to form a gel structure; S7: transferring the formed gel to a low temperature environment for curing. This step helps to improve the mechanical strength and stability of the gel; S8: Post-processing the solidified gel, including drying, cutting and morphology adjustment, to obtain the final polyvinyl alcohol gel product.
[0024] The proportions of the raw materials in S1 are: polyvinyl alcohol powder 12%; first cross-linking agent 2%; second cross-linking agent 1%; thickener 1.5%; pH adjuster 0.3%; solvent 83.2%.
[0025] The first cross-linking agent is glutaraldehyde; the second cross-linking agent is sodium silicate; the thickener is hydroxypropyl methylcellulose; the pH regulator is citric acid; and the solvent is deionized water.
[0026] S2 specifically includes: S21: placing a pre-weighed amount of solvent in a stirring container and heating it to 70° C.; S22: While keeping the temperature of the solvent stable, gradually add the pre-weighed polyvinyl alcohol powder, and control the addition rate to 3% of the solvent volume per minute to avoid excessive local concentration of the solution due to all-in addition; S23: During the addition of the polyvinyl alcohol powder, stirring was continued and the stirring speed was controlled to be 350 rpm. Stirring was continued to prevent the powder from agglomerating and ensure that it was evenly dispersed in the solvent; S24: After the polyvinyl alcohol powder is completely added, gradually increase the solution temperature to 90° C., continue stirring within this temperature range, and adjust the stirring speed to 500 rpm until the polyvinyl alcohol is completely dissolved.
[0027] S3 specifically includes: S31: Cooling the polyvinyl alcohol solution formed in S2 to 50° C., and maintaining the temperature to facilitate the addition and dissolution of the thickener; S32: While keeping the solution temperature stable, gradually add the pre-weighed thickener at a rate of 2% of the solution volume per minute to ensure uniform distribution of the thickener; S33: During the thickener addition process, the stirring speed is maintained at 400 rpm, and the stirring is continued until the thickener is completely dissolved and uniformly mixed with the polyvinyl alcohol solution to form a mixed solution A.
[0028] S4 specifically includes: S41: Cooling the mixed solution A formed in S3 to 35° C., and maintaining the temperature to facilitate the addition and reaction of the cross-linking agent; S42: While keeping the temperature of the mixed solution A stable, gradually add the pre-weighed first cross-linking agent, maintain the stirring speed at 300 rpm, and ensure that the first cross-linking agent is evenly distributed; S43: After the first cross-linking agent is completely added and evenly distributed, gradually add the pre-weighed second cross-linking agent, maintaining the stirring speed at 300 rpm, until the second cross-linking agent is fully mixed with the mixed solution A to form a mixed solution B.
[0029] S5 specifically includes: S51: After the mixed solution B is formed, the initial pH value of the solution is measured using a pH meter to understand the current pH value of the solution; S52: according to the preliminary pH measurement result, gradually add the pre-weighed pH adjuster, while maintaining the stirring speed at 200 rpm, and add the pH adjuster while stirring until the pH value of the solution reaches a predetermined value of 5, ensuring that the solution is suitable for gel formation; S53: After the pH value of the solution reaches a predetermined value, stirring is continued for 7 minutes to ensure that the pH value is uniform and stable.
[0030] S6 specifically includes: S61: moving the mixed solution B with the pH value adjusted in S5 into a stable container, ensuring that the surface of the solution in the container is flat to avoid unevenness during the gel formation process; S62: Place the container at room temperature of 22°C, keep the solution still, and prevent external vibration or disturbance from affecting the uniform formation of the gel; S63: Keep the solution still for 3 hours to allow the polyvinyl alcohol and the cross-linking agent to fully react during this period to form a uniform gel structure.
[0031] S7 specifically includes: S71: After the gel is formed, remove it from the static container to avoid disturbing the gel structure and transfer it to a clean tray to ensure that the gel thickness is uniform for subsequent curing; S72: Place the tray loaded with gel in an environment of 7°C for precooling for 45 minutes to gradually lower the gel temperature and stabilize its structure; S73: The pre-cooled gel is transferred to a low temperature environment of -15°C for curing. The curing time is controlled within 18 hours to ensure that the inside of the gel is completely cured to form a stable gel structure.
[0032] The post-processing of the solidified gel in S8 specifically includes: S81: Take the solidified gel out of the low temperature environment and immediately transfer it to a drying device for drying at 50°C for 6 hours until the water content of the gel drops to 2%; S82: Move the dried gel to the cutting table and cut it according to the predetermined specifications. The cutting thickness is controlled at 1 mm to ensure that the size and shape meet the design requirements; S83: Adjust the shape of the cut gel, including removing edges and corners, smoothing the surface, and shaping the gel using a mold to obtain the final polyvinyl alcohol gel product, ensuring that the appearance and size of the product meet the final use requirements.
[0033] Example 2 Raw material preparation: First, weigh the raw materials according to the preset proportion, specifically 8% polyvinyl alcohol powder, 1% first cross-linking agent (glyoxal), 0.5% second cross-linking agent (potassium aluminum sulfate), 0.5% thickener (carboxymethyl cellulose), 0.1% pH adjuster (citric acid) and 89.9% solvent (acetic acid); Dissolution step: After heating the solvent to 60°C, gradually add the polyvinyl alcohol powder, and control the addition rate to 1% of the solvent volume per minute, while maintaining the stirring speed at 200rpm. After the polyvinyl alcohol powder is completely added, continue to increase the temperature to 80°C and increase the stirring speed to 400rpm until it is completely dissolved; Thickener addition: Cool the solution to 40°C, then gradually add the pre-weighed thickener at a rate of 1% of the solution volume per minute, adjust the stirring speed to 300 rpm, and continue until the thickener is completely dissolved to form a mixed solution; Adding crosslinking agent: After the mixed solution A is cooled to 30°C, the first crosslinking agent and the second crosslinking agent are added in sequence, and the stirring speed is maintained at 200 rpm until the two crosslinking agents are completely blended to form a mixed solution B; pH adjustment: Initially, the pH value of the mixed solution B was measured using a pH meter, and then the pH adjuster was gradually added to adjust the pH to 4 while maintaining the stirring speed at 100 rpm. After the addition was completed, stirring was continued for 5 minutes to ensure that the pH value was uniform and stable; Gel formation and solidification: The pH-adjusted mixed solution B was placed at room temperature (20°C) for 2 hours to promote the formation of the gel structure. After that, the gel was transferred to a 4°C environment for precooling for 30 minutes, and then placed at -10°C for 12 hours to solidify to form a stable gel structure; Post-processing: The cured gel is first dried at 40°C for 4 hours until the water content of the gel drops to 4%. It is then moved to a cutting table and cut into pieces with a thickness of 0.5 mm. The shape is adjusted using a mold to finally obtain a polyvinyl alcohol gel product that meets the expected specifications.
[0034] Example 3 Raw material preparation: First, weigh the raw materials according to the preset proportion, specifically 15% polyvinyl alcohol powder, 3% first cross-linking agent (oxychloropropane), 2% second cross-linking agent (zinc sulfate), 2% thickener (xanthan gum), 0.5% pH adjuster (sodium dihydrogen phosphate) and 77.5% solvent (propylene glycol); Dissolution step: After heating the solvent to 80°C, gradually add the polyvinyl alcohol powder, and control the addition rate to 5% of the solvent volume per minute, while maintaining the stirring speed at 400rpm. After the polyvinyl alcohol powder is completely added, continue to increase the temperature to 95°C and increase the stirring speed to 600rpm until it is completely dissolved; Thickener addition: Cool the solution to 60°C, then gradually add the pre-weighed thickener at a rate of 3% of the solution volume per minute, adjust the stirring speed to 500 rpm, and continue until the thickener is completely dissolved to form a mixed solution; Adding crosslinking agent: After the mixed solution A is cooled to 40°C, the first crosslinking agent and the second crosslinking agent are added in sequence, and the stirring speed is maintained at 400 rpm until the two crosslinking agents are completely blended to form a mixed solution B; pH adjustment: Initially, the pH value of the mixed solution B was measured using a pH meter, and then the pH adjuster was gradually added to adjust the pH to 6 while maintaining the stirring speed at 300 rpm. After the addition was completed, stirring was continued for 10 minutes to ensure that the pH value was uniform and stable; Gel formation and solidification: The pH-adjusted mixed solution B was placed at room temperature (25°C) for 4 hours to promote the formation of the gel structure. After that, the gel was transferred to a 10°C environment for precooling for 60 minutes, and then placed at -20°C for solidification for 24 hours to form a stable gel structure; Post-processing: The cured gel is first dried at 60°C for 8 hours until the water content of the gel drops to 5%. It is then moved to a cutting table and cut into 2 mm thick pieces. The shape is adjusted using a mold to finally obtain a polyvinyl alcohol gel product that meets the expected specifications.
[0035] Table 1 Comparison of performance parameters of polyvinyl alcohol gel products It can be seen from Table 1 above that the polyvinyl alcohol gel of Example 1 shows the best performance in all compared performance indicators. Specifically, Example 1 has the highest mechanical strength (1.5 MPa) and the best transparency (95%), and also shows the highest water absorption rate (300%). In addition, the pH stability of the gel is optimal, with a variation range of only ±0.1, showing extremely high chemical stability. In terms of temperature resistance, the product of Example 1 can withstand a temperature range from -20°C to 70°C, and is suitable for use in extreme environments. Finally, its biodegradation rate is the lowest (4% per month), indicating that it also has significant advantages in environmental friendliness.
[0036] Table 2 Comparison of other parameters As can be seen from Table 2 above, Example 1 performs well in multiple key performance parameters, reflecting its potential advantages in industrial applications. The thickness consistency of Example 1 reaches 98%, indicating that it has high accuracy and repeatability in the production process. Its storage stability is 12 months, which is far superior to other examples, reducing the performance degradation problem during long-term storage. In addition, the initial viscosity of Example 1 is low (1400 mPa·s), indicating that it is easier to operate and apply during initial processing; in terms of hardness after curing, Example 1 also shows better performance (Shore A 80), which is particularly important for applications that require a certain mechanical strength. The solvent evaporation rate is low (0.5% per hour), further proving its applicability in occasions with strict environmental control. The quality consistency of the final product is 99%, which means that the difference between each batch of products produced is extremely small, ensuring the reliability of the product and the trust of users; in terms of environmental protection, Example 1 has the lowest biodegradation rate (4% per month), which means that it has a small impact on the environment and meets the current demand for sustainable materials.
[0037] Taking the above factors into consideration, Example 1 is superior to other examples in terms of performance and application potential, indicating that it has wide applicability and high-efficiency production potential in industrial production.
[0038] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.
[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. An efficient method for preparing polyvinyl alcohol gel, characterized in that: The following steps are involved: S1: weighing polyvinyl alcohol powder, a first cross-linking agent, a second cross-linking agent, a thickener, a pH adjuster and a solvent according to a preset ratio; S2: adding polyvinyl alcohol powder to a pre-weighed solvent, heating and continuously stirring to form a uniform polyvinyl alcohol solution; S3: After the polyvinyl alcohol solution is cooled to a predetermined temperature, a pre-weighed thickener is gradually added and stirred continuously until it is completely dissolved to form a mixed solution A; S4: After the mixed solution A is cooled, the first cross-linking agent and the second cross-linking agent are added in sequence, and the mixture is stirred and mixed to form a mixed solution B; S5: adding a pH adjuster to the mixed solution B to adjust the pH to a predetermined pH range for gel formation; S6: leaving the mixed solution B with adjusted pH value to stand at room temperature to allow the polyvinyl alcohol to react with the cross-linking agent to form a gel structure; S7: transferring the formed gel to a low temperature environment for solidification; S8: Post-processing the solidified gel, including drying, cutting and morphology adjustment, to obtain the final polyvinyl alcohol gel product.
2. The method for preparing polyvinyl alcohol gel according to claim 1, characterized in that: The proportions of the raw materials in S1 are: polyvinyl alcohol powder 8%-15%; first cross-linking agent 1%-3%; second cross-linking agent 0.5%-2%; thickener 0.5%-2%; pH adjuster 0.1%-0.5%; solvent 77.5%-89.9%.
3. The method for preparing polyvinyl alcohol gel according to claim 1, characterized in that: The first cross-linking agent is glutaraldehyde, glyoxal or epichlorohydrin; the second cross-linking agent is sodium silicate, potassium aluminum sulfate or zinc sulfate; the thickener is hydroxypropyl methylcellulose, carboxymethyl cellulose or xanthan gum; the pH regulator is citric acid, acetic acid or sodium dihydrogen phosphate; and the solvent is deionized water, ethanol or propylene glycol.
4. The method for preparing polyvinyl alcohol gel according to claim 1, characterized in that: The S2 specifically includes: S21: placing a pre-weighed amount of solvent in a stirring container and heating it to 60° C. to 80° C.; S22: While keeping the temperature of the solvent stable, gradually add the pre-weighed polyvinyl alcohol powder, and control the addition rate to 1%-5% of the solvent volume per minute; S23: During the process of adding the polyvinyl alcohol powder, stirring is continued, and the stirring speed is controlled to be 200 rpm to 400 rpm; S24: After the polyvinyl alcohol powder is completely added, gradually increase the solution temperature to 80° C. to 95° C., and adjust the stirring speed to 400 rpm to 600 rpm until the polyvinyl alcohol is completely dissolved.
5. The method for preparing an efficient polyvinyl alcohol gel according to claim 1, characterized in that: The S3 specifically includes: S31: Cooling the polyvinyl alcohol solution formed in S2 to 40° C. to 60° C.; S32: While keeping the solution temperature stable, gradually add the pre-weighed thickener at a rate of 1%-3% of the solution volume per minute; S33: During the thickener addition process, the stirring speed is maintained at 300 rpm to 500 rpm, and the stirring is continued until the thickener is completely dissolved and uniformly mixed with the polyvinyl alcohol solution to form a mixed solution A.
6. The method for preparing an efficient polyvinyl alcohol gel according to claim 1, characterized in that: The S4 specifically includes: S41: Cooling the mixed solution A formed in S3 to 30° C. to 40° C.; S42: while keeping the temperature of the mixed solution A stable, gradually adding the pre-weighed first cross-linking agent, and maintaining the stirring speed at 200 rpm to 400 rpm; S43: After the first cross-linking agent is completely added and evenly distributed, the pre-weighed second cross-linking agent is gradually added, and the stirring speed is maintained at 200 rpm to 400 rpm until the second cross-linking agent is fully mixed with the mixed solution A to form a mixed solution B.
7. The method for preparing an efficient polyvinyl alcohol gel according to claim 1, characterized in that: The S5 specifically includes: S51: After the mixed solution B is formed, the initial pH value of the solution is measured using a pH meter to understand the current pH value of the solution; S52: according to the preliminary pH measurement result, gradually adding a pre-weighed pH adjuster, while maintaining a stirring speed of 100 rpm to 300 rpm, and adding the pH adjuster while stirring until the pH value of the solution reaches a predetermined range of 4 to 6; S53: After the pH value of the solution reaches a predetermined value, continue stirring for 5 to 10 minutes to ensure that the pH value is uniform and stable.
8. The method for preparing polyvinyl alcohol gel according to claim 1, characterized in that: The S6 specifically includes: S61: Move the mixed solution B with the pH value adjusted in S5 into a stable container, and ensure that the surface of the solution in the container is flat; S62: Place the container at room temperature of 20°C to 25°C and keep the solution still; S63: Keep the solution standing for 2 to 4 hours to allow the polyvinyl alcohol and the cross-linking agent to fully react during this period to form a uniform gel structure.
9. The method for preparing polyvinyl alcohol gel according to claim 1, characterized in that: The S7 specifically includes: S71: After the gel is formed, remove it from the resting container and transfer it to a clean tray; S72: placing the tray loaded with gel in an environment of 4°C to 10°C for precooling for 30 to 60 minutes; S73: The pre-cooled gel is transferred to a low temperature environment of -10°C to -20°C for curing. The curing time is controlled within 12 to 24 hours to form a stable gel structure.
10. The method for preparing polyvinyl alcohol gel according to claim 1, characterized in that: The S8 specifically includes: S81: taking the solidified gel out of the low temperature environment and immediately transferring it to a drying device for drying at a temperature of 40°C to 60°C for 4 to 8 hours until the water content of the gel drops below 5%; S82: moving the dried gel to a cutting table and cutting it according to predetermined specifications, with the cutting thickness controlled to be between 0.5 mm and 2 mm; S83: Adjusting the shape of the cut gel, including removing corners, smoothing the surface, and shaping the gel using a mold to obtain a final polyvinyl alcohol gel product.