Polyethanol instant glue powder and preparation method thereof

Abstract

The invention relates to polyethylene ethanol instant glue powder which is characterized by comprising the following components in percentage by mass: 3-18% of PVA (Polyvinyl Alcohol) with extremely high polymerization degree; 20%-30% of PVA with a high polymerization degree; the medium polymerization degree PVA accounts for 30%-40%; 20%-45% of PVA with a low polymerization degree; 1%-5% of a plasticizer; and 0.5%-2% of a surfactant. The solubility and the strength are balanced through molecular weight gradient compounding, the compounding proportion of PVA with different polymerization degrees is optimized, the dissolving speed and the film-forming property of the PVA rubber powder are effectively improved, and the requirements of different application scenes are met; according to the technical scheme, by optimizing the performance of the PVA rubber powder, waste in the production and use process is reduced, environmental pollution is reduced, efficient utilization of resources is achieved, and by adjusting the compounding proportion of PVA with different polymerization degrees, the adaptability and performance stability of the PVA rubber powder in different application scenes are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer material processing, in particular to polyethanol instant glue powder and a preparation method thereof. Background Art

[0002] Polyethanol instant glue powder usually refers to polyethanol PVA-based glue powder, which is an environmentally friendly water-soluble polymer material and is widely used in adhesives, prevention and control, papermaking and other fields.

[0003] Existing PVA-based rubber powders are typically composed of a single molecular weight PVA, such as one of the following: extremely high degree of polymerization (molecular weight of 250,000-300,000), high degree of polymerization (molecular weight of 170,000-220,000), medium degree of polymerization (molecular weight of 120,000-150,000), or low degree of polymerization (molecular weight of 25,000-30,000). Traditional PVA-based rubber powders suffer from slow dissolution and unstable film-forming properties, which limit their performance in specific applications. While high-molecular-weight PVA offers excellent film-forming properties, it dissolves slowly, while low-molecular-weight PVA dissolves quickly but exhibits poor film-forming properties. This leads to waste and environmental pollution during production and use. Therefore, optimizing the dissolution rate and film-forming properties of PVA rubber powder while reducing waste and environmental pollution has become a key research direction in the field of rubber powder technology. Summary of the Invention

[0004] The present invention aims to provide a polyethanol instant glue powder to solve the technical problem in the prior art that the polyethanol instant glue powder is made of a single molecular weight PVA, resulting in its dissolution rate and film-forming properties not being able to be taken into account at the same time; the present invention also aims to provide a method for preparing the polyethanol instant glue powder.

[0005] In order to solve the above technical problems, the technical solution of a polyethanol instant glue powder in the present invention is as follows: A polyethanol instant glue powder comprising the following components in the following mass ratios: Very high polymerization degree PVA, 3%~18%; High polymerization degree PVA, 20%~30%; Medium polymerization degree PVA, 30%~40%; Low polymerization degree PVA, 20%~45%; Plasticizer, 1%~5%; Surfactant, 0.5%~2%.

[0006] Furthermore, the number average molecular weight of the extremely high polymerization degree PVA is 250,000 to 300,000; the number average molecular weight of the high polymerization degree PVA is 170,000 to 220,000; the number average molecular weight of the medium polymerization degree PVA is 120,000 to 150,000; and the number average molecular weight of the low polymerization degree PVA is 25,000 to 30,000.

[0007] Furthermore, the speed increasing agent is dibutyl phthalate; and the surfactant is sodium dodecylbenzenesulfonate.

[0008] Furthermore, the polyethanol instant glue powder is used in construction glue, with the mass proportion of low polymerization degree PVA being 40% to 50%, the mass proportion of extremely high polymerization degree PVA being 3% to 8%, the mass proportion of high polymerization degree PVA being 22% to 25%, and the mass proportion of medium polymerization degree PVA being 35% to 40%.

[0009] Furthermore, the polyethanol instant glue powder is used for high-strength adhesives, with the mass proportion of extremely high polymerization degree PVA being 12% to 18%, the mass proportion of low polymerization degree PVA being 20% ​​to 30%, the mass proportion of medium polymerization degree PVA being 30% to 35%, and the mass proportion of high polymerization degree PVA being 25% to 30%.

[0010] Furthermore, the polyethanol instant adhesive powder further comprises ethylene glycol in a mass ratio of 2% to 6% and polyisocyanate in a mass ratio of 0.3% to 1.5%.

[0011] The technical solution of the preparation method of polyethanol instant glue powder in the present invention is: The preparation method comprises the following steps, In the first step, PVA of different molecular weight grades is dried to remove impurities and lumps; The second step is to measure the molecular weight of PVA of different batches and molecular weight grades to ensure that the selected PVA is of the specified molecular weight grade; The third step is to weigh the PVA of the corresponding molecular weight grade; The fourth step is to pour the weighed PVA powders of different molecular weight grades into a mixing container for premixing. Step 5: Evenly mix the PVA powder prepared in step 4 with a high-speed stirring device at a temperature of 40°C to 60°C. During the mixing process, online monitoring technology is used to monitor the molecular weight distribution changes of the mixed material in real time. The mixing parameters such as stirring time and speed are adjusted until a uniform molecular weight gradient distribution is achieved. In the sixth step, the plasticizer and surfactant powders are mixed into the PVA powder in the fifth step, and the PVA powder, the plasticizer and the surfactant are mixed evenly using a low-speed mixer.

[0012] The beneficial effects of the present invention are as follows: in the present invention, solubility and strength are balanced through molecular weight gradient compounding, the compounding ratio of PVA with different polymerization degrees is optimized, the dissolution rate and film-forming performance of PVA glue powder are effectively improved, and the needs of different application scenarios are met; this technical solution optimizes the performance of PVA glue powder, reduces waste in the production and use process, reduces environmental pollution, and realizes efficient utilization of resources; this technical solution enhances the adaptability and performance stability of PVA glue powder in different application scenarios by adjusting the compounding ratio of PVA with different polymerization degrees. DETAILED DESCRIPTION

[0013] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0014] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0015] Example 1 of a polyethanol instant glue powder of the present invention: In Example 1, polyethanol instant glue powder is used in construction glue. It includes the following components in mass ratio, Very high polymerization degree PVA, 8%; High polymerization degree PVA, 25%; Medium polymerization degree PVA, 35%; Low polymerization degree PVA, 32%; Plasticizer, dibutyl phthalate 3%; Surfactant, sodium dodecylbenzenesulfonate 1%.

[0016] The solubility and strength of the compound rubber powder were tested, and the results showed that its dissolution rate was more than 30% faster than that of single extremely high polymerization degree PVA and single high polymerization degree PVA, and its film-forming performance was basically the same as that of single extremely high polymerization degree PVA and single high polymerization degree PVA; and the dissolution rate level of the compound rubber powder was the same as or slightly lower than that of single medium polymerization degree PVA and low polymerization degree PVA (the difference in dissolution rate was within 5%), and its film-forming performance was better than that of single low polymerization degree PVA and single medium polymerization degree PVA.

[0017] Plasticizer, dibutyl phthalate can improve the flexibility of the film and at the same time promote the dissolution rate to a certain extent; surfactant sodium dodecylbenzenesulfonate can reduce the surface tension of the solution and improve solubility.

[0018] Comparative Example 1 of a polyethanol instant glue powder in the present invention: In Comparative Example 1, polyethanol instant glue powder was used in construction glue. It includes the following components in mass ratio, Very high polymerization degree PVA, 8%; High polymerization degree PVA, 25%; Medium polymerization degree PVA, 35%; Low polymerization degree PVA, 32%.

[0019] The solubility and strength of the compound rubber powder were tested, and the results showed that its dissolution rate was more than 20% faster than that of single extremely high polymerization degree PVA and single high polymerization degree PVA, and its film-forming performance was basically lower than that of single extremely high polymerization degree PVA and single high polymerization degree PVA; and the dissolution rate of the compound rubber powder was lower than that of single medium polymerization degree PVA and low polymerization degree PVA, and the dissolution rate of the compound rubber powder was more than 10% lower than that of single medium polymerization degree PVA and low polymerization degree PVA.

[0020] In Example 2, polyethanol instant glue powder is used as a high-strength adhesive. It includes the following components in mass ratio, Very high polymerization degree PVA, 15%; High polymerization degree PVA, 28%; Medium polymerization degree PVA, 35%; Low polymerization degree PVA, 22%; Plasticizer, dibutyl phthalate 4%; Surfactant, sodium dodecylbenzenesulfonate 1.5%.

[0021] The solubility and strength of the compound rubber powder were tested, and the results showed that the film-forming strength of the compound rubber powder was more than 20% higher than that of single medium-polymerization degree PVA and low-polymerization degree PVA, and its dissolution rate was 3% less than that of single medium-polymerization degree PVA and low-polymerization degree PVA.

[0022] Example 3: Polyethanol instant payment includes the following components in mass ratio: Very high polymerization degree PVA, 10%; High polymerization degree PVA, 30%; Medium polymerization degree PVA, 40%; Low polymerization degree PVA, 20%; Plasticizer, dibutyl phthalate 2%; Surfactant, sodium dodecylbenzenesulfonate 1%.

[0023] The solubility and strength of the compound rubber powder were tested, and the results showed that its dissolution rate was more than 25% faster than that of single extremely high polymerization degree PVA and single high polymerization degree PVA, and its film-forming property was better than that of single medium polymerization degree PVA and single low polymerization degree PVA, with excellent overall performance.

[0024] This technical solution optimizes the dissolution rate and film-forming properties of PVA rubber powder through molecular weight gradient compounding. By adjusting the compounding ratio according to different application scenarios, PVA rubber powder products that meet specific needs can be prepared. Compared with traditional technologies, this technical solution has the following advantages: 1) Through molecular weight gradient compounding, the dissolution rate and film-forming properties of PVA powder are balanced, solving the problem that a single molecular weight PVA cannot meet both performance requirements at the same time.

[0025] 2) By adding plasticizers and surfactants, the flexibility and solubility of PVA powder are further improved, and the film-forming properties are enhanced.

[0026] 3) By adjusting the compounding ratio according to different application scenarios, PVA powder products that meet specific needs can be prepared, which has good adaptability and flexibility.

[0027] 4) It optimizes the production and application process of PVA powder, reduces waste and environmental pollution, lowers production costs, and has good economic and social benefits.

[0028] An embodiment of a method for preparing polyethanol instant glue powder in the present invention: The preparation method comprises the following steps: In the first step, PVA of different molecular weight grades is dried to remove impurities and lumps; The second step is to measure the molecular weight of PVA of different batches and molecular weight grades to ensure that the selected PVA is of the specified molecular weight grade; The determination process can use gel permeation chromatography (GPC): This is one of the more commonly used methods for determining the molecular weight distribution of polymers. By passing the PVA solution through a series of gel columns with different pore sizes, the large molecular weight PVA will flow out first and the small molecular weight will flow out later, so as to separate and determine the PVA content of different molecular weight grades; or by laser scattering method. This method is based on the principle of light scattering and infers the molecular weight and its distribution by detecting the scattered light intensity of particles in the PVA solution. It is suitable for higher precision determination, especially when it is necessary to analyze samples with extremely wide molecular weight distribution.

[0029] The third step is to weigh the PVA of the corresponding molecular weight grade; The fourth step is to pour the weighed PVA powders of different molecular weight grades into a mixing container for premixing. During the premixing process, the mixed PVA powders are gently poured into the mixing container to avoid strong impact to prevent local thermal effects.

[0030] In the fifth step, a high-speed stirring device is installed in the mixing container at a temperature of 40°C to 60°C. The PVA powder in the fourth step is evenly mixed by the high-speed stirring device. The stirring speed of the high-speed stirring device is 150 to 350 rpm. High-speed stirring can break some molecular chains and increase the activity of the molecular chains to improve the dissolution rate of PVA when used. During the mixing process, online monitoring technology is used to monitor the changes in the molecular weight distribution of the mixed material in real time by adjusting the mixing parameters of stirring time and speed until a uniform molecular weight gradient distribution is achieved. The monitoring of molecular weight changes in the mixed material can be achieved through online monitoring technology, such as infrared spectroscopy (NIR) or Raman spectroscopy, to monitor the changes in the molecular weight distribution of the mixed material in real time. In the fifth step, ultrasonic equipment can also be used to treat the PVA powder in the high-speed stirring device. The cavitation effect of the ultrasonic wave and the mechanical effect of the high-speed stirring device can further destroy the aggregation state of the PVA molecular chain and improve its dispersibility in the solvent when used. In the sixth step, plasticizer and surfactant powders are added to the PVA powder from the fifth step. A low-speed mixer is used to evenly mix the PVA powder, plasticizer, and surfactant. The low-speed mixer is stirred at a speed of 50 to 100 rpm. Plasticizers and surfactants are used to further improve the solubility and film-forming properties of the PVA powder, but reinforcing agents and surfactants are not easily stirred at high speeds.

[0031] In the foregoing description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0033] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A polyethanol instant glue powder, characterized in that: Comprising the following ingredients in mass ratio, Very high polymerization degree PVA, 3%~18%; High polymerization degree PVA, 20%~30%; Medium polymerization degree PVA, 30%~40%; Low polymerization degree PVA, 20%~45%; Plasticizer, 1%~5%; Surfactant, 0.5%~2%.

2. The polyethanol instant glue powder according to claim 1, wherein: The number average molecular weight of the extremely high polymerization degree PVA is 250,000 to 300,000; the number average molecular weight of the high polymerization degree PVA is 170,000 to 220,000; the number average molecular weight of the medium polymerization degree PVA is 120,000 to 150,000; and the number average molecular weight of the low polymerization degree PVA is 25,000 to 30,000.

3. The polyethanol instant glue powder according to claim 1, wherein: The speed increasing agent is dibutyl phthalate; and the surfactant is sodium dodecylbenzenesulfonate.

4. The polyethanol instant glue powder according to claim 1, wherein: The polyethanol instant glue powder is used for construction glue, wherein the mass proportion of low polymerization degree PVA is 40% to 50%, the mass proportion of extremely high polymerization degree PVA is 3% to 8%, the mass proportion of high polymerization degree PVA is 22% to 25%, and the mass proportion of medium polymerization degree PVA is 35% to 40%.

5. The polyethanol instant glue powder according to claim 1, wherein: The polyethanol instant adhesive powder is used for high-strength adhesives, wherein the mass proportion of extremely high polymerization degree PVA is 12% to 18%, the mass proportion of low polymerization degree PVA is 20% to 30%, the mass proportion of medium polymerization degree PVA is 30% to 35%, and the mass proportion of high polymerization degree PVA is 25% to 30%.

6. The polyethanol instant glue powder according to claim 6, characterized in that: The polyethanol instant glue powder further comprises ethylene glycol in a mass ratio of 2% to 6% and polyisocyanate in a mass ratio of 0.3% to 1.5%.

7. A method for preparing the polyethanol instant glue powder according to any one of claims 1 to 6, characterized in that: The preparation method The following steps are included: In the first step, PVA of different molecular weight grades is dried to remove impurities and lumps; The second step is to measure the molecular weight of PVA of different batches and molecular weight grades to ensure that the selected PVA is of the specified molecular weight grade; The third step is to weigh the PVA of the corresponding molecular weight grade; Step 4: Pour the weighed PVA powders of different molecular weight grades into a mixing container for premixing. Step 5: Evenly mix the PVA powder prepared in step 4 with a high-speed stirring device at a temperature of 40°C to 60°C. During the mixing process, online monitoring technology is used to monitor the molecular weight distribution changes of the mixed material in real time. The mixing parameters such as stirring time and speed are adjusted until a uniform molecular weight gradient distribution is achieved. In the sixth step, the plasticizer and surfactant powders are mixed into the PVA powder in the fifth step, and the PVA powder, the plasticizer and the surfactant are mixed evenly using a low-speed mixer.