Preparation method of anti-evaporation water-retaining material, soft water cellar film and application

Abstract

To solve the technical problem that the utilization rate of rainwater is reduced due to the fast evaporation of rainwater stored in the existing water cellar, the embodiment of the present application provides a preparation method of an anti-evaporation water conservation material, a soft water cellar film and an application, comprising: uniformly dissolving water, alkyl sulfate and a first fatty alcohol polyoxyethylene ether to obtain a mixed solution; adding liquid anti-evaporation agent, a second fatty alcohol polyoxyethylene ether and pre-uniformly mixed alpha-methacrylic acid, first ethylene glycol dipropylene acrylate and dibenzoyl peroxide into the mixed solution to mix and emulsify, thereby obtaining an emulsion; after the emulsion is reacted by heating, an aqueous solution of potassium persulfate is further added to continue the reaction, thereby obtaining a core layer solution; uniformly mixing vinyl acetate, butyl acrylate, hydroxyethyl acrylate and second ethylene glycol dipropylene acrylate to obtain a shell layer solution; and adding the shell layer solution into the core layer solution to react, thereby obtaining the anti-evaporation water conservation material. The embodiment of the present application has the characteristics of green, environmental protection, simple process flow and easy implementation.

Description

TECHNICAL FIELD

[0001] The present application relates to a preparation method of an anti-evaporation water preservation material, a soft water cellar film and an application. BACKGROUND

[0002] For a long time, Yunnan Province has solved the problems of agricultural irrigation and livestock drinking water by constructing a large number of water cellar, small pool, small pond and other rainwater collection and storage facilities, and good results have been achieved. The traditional water cellar and other rainwater collection and storage facilities have the following avoidable defects: due to the global temperature rise in recent years, the rainwater collection and storage facilities dominated by water cellar have different degrees of excessive evaporation of rainwater, most of the collected rainwater cannot be well stored and is evaporated, especially in high-temperature areas, the situation is more prominent.

[0003] As for the design and construction of the rainwater collection and storage facilities dominated by water cellar at present, the traditional mode is still used. The traditional water cellar has the following defects in large-area rainwater collection and storage: the structural form is not flexible, the symmetry surface selection lacks effective calculation basis, is easy to be damaged and collapsed, has high requirements for soil quality, and makes the large-area rainwater collection and storage in cities be limited to different degrees. Moreover, the rainwater cannot be well stored and the evaporation of rainwater is reduced, which reduces the utilization rate of rainwater. Even if there is a water cellar that can improve rainwater storage, it is not suitable for large-area and large-scale planting use. SUMMARY

[0004] To solve the technical problem that the utilization rate of rainwater is reduced due to the excessive evaporation of rainwater stored in the existing water cellar, the present application provides a preparation method of an anti-evaporation water preservation material, a soft water cellar film and an application.

[0005] The present application achieves the following technical solutions:

[0006] In a first aspect, the present application provides a preparation method of an anti-evaporation water preservation material, comprising:

[0007] dissolving and mixing water, alkyl sulfate and a first fatty alcohol polyoxyethylene ether to obtain a mixed solution;

[0008] adding liquid anti-evaporation agent, a second fatty alcohol polyoxyethylene ether and pre-mixed alpha-methyl acrylic acid, a first ethylene glycol dipropylene acrylate and dibenzoyl peroxide into the mixed solution to mix and emulsify, to obtain an emulsion;

[0009] after the emulsion is reacted at a high temperature, adding an aqueous solution of potassium persulfate to continue the reaction to obtain a core layer solution;

[0010] mixing vinyl acetate, butyl acrylate, hydroxyethyl acrylate and a second ethylene glycol dipropylene acrylate to obtain a shell layer solution;

[0011] adding the shell layer solution into the core layer solution to react, to obtain an anti-evaporation water preservation material.

[0012] Further, the shell layer solution is added to the core layer solution to obtain an anti-evaporation water-retention material, comprising:

[0013] The shell layer solution is added to the core layer solution to obtain a white polymer emulsion;

[0014] The white polymer emulsion is spray-dried to obtain a white nanoparticle powder;

[0015] The white nanoparticle powder is melt-mixed with polyethylene to obtain a polymer film.

[0016] Further, the anti-evaporation agent is one or more of sorbitol, octanol, decanol, lauryl alcohol, coconut oil, octanoic acid, decanoic acid, or lauric acid; and the alkyl sulfate is dodecyl sulfate.

[0017] Further, the mass ratio of water, alkyl sulfate, and first fatty alcohol polyoxyethylene ether is 800-1000: 1-1.5: 1.5-2.

[0018] Further, the mass ratio of water, alkyl sulfate, and first fatty alcohol polyoxyethylene ether, anti-evaporation agent, alpha-methyl acrylic acid, first ethylene glycol diacrylate, dibenzoyl peroxide, and second fatty alcohol polyoxyethylene ether is 800-1000: 1-1.5: 1.5-2: 100-120: 10-15: 2-3: 0.1-0.5: 1.5-2.

[0019] Further, the mass ratio of vinyl acetate, butyl acrylate, hydroxyethyl acrylate, and second ethylene glycol diacrylate is 75-100: 10-15: 10-12: 2-3.

[0020] Further, the liquid anti-evaporation agent and second fatty alcohol polyoxyethylene ether are added to the mixture of pre-mixed alpha-methyl acrylic acid, first ethylene glycol diacrylate, and dibenzoyl peroxide, mixed, and emulsified to obtain an emulsion, comprising:

[0021] The anti-evaporation agent is heated to a liquid and added to the mixture of pre-mixed alpha-methyl acrylic acid, first ethylene glycol diacrylate, and dibenzoyl peroxide, and stirred at a water bath temperature of 45-55°C and a speed of 1300-1600 rpm for 0.5-1h to emulsify, obtaining an emulsion.

[0022] Further, after the emulsion is warmed and reacted, an aqueous solution of potassium persulfate is added to continue the reaction to obtain a core layer solution, comprising:

[0023] The emulsion is heated to 70-80 DEG C, and reacted for 1.5-2.5 hours at 250-500 rpm, then an aqueous solution of potassium persulfate is added and reacted for 10-20 minutes, to obtain a core layer solution; wherein the mass ratio of potassium persulfate to water in the aqueous solution of potassium persulfate is 1.5-2:200-250;

[0024] The core layer solution is added to the core layer solution to obtain a white polymer emulsion, including:

[0025] The core layer solution is added to the core layer solution to obtain a white polymer emulsion, including:

[0026] In a second aspect, the embodiment of the present application provides a soft water cellar film made of the anti-evaporation water-retaining material prepared by the preparation method of the anti-evaporation water-retaining material and a polymer film prepared from polyethylene.

[0027] In a third aspect, the embodiment of the present application provides a use of the anti-evaporation water-retaining material prepared by the preparation method of the anti-evaporation water-retaining material for preventing rainwater evaporation in a water cellar.

[0028] Compared with the prior art, the embodiment of the present application has the following advantages and beneficial effects:

[0029] The preparation method of the anti-evaporation water-retaining material, the soft water cellar film and the use of the embodiment of the present application coat the anti-evaporation agent by using the nano core-shell coating technology and the supramolecular controlled release technology, prepare a white polymer emulsion containing the anti-evaporation agent, dry the white polymer emulsion, and then melt and blow a film from low-density polyethylene to produce a soft water cellar film with the anti-evaporation function. Unlike the traditional plastic film, the soft water cellar film containing the anti-evaporation agent of the present application will precipitate and float to the water surface to form a nano-level hydrophobic small molecule film during use, so as to achieve the water-retaining effect. Therefore, the embodiment of the present application has the characteristics of green, environmental protection, simple process flow and easy implementation, and the related products can be widely used to replace the traditional plastic film and applied to the next generation of soft water cellar. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the example embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 It is a flowchart of the preparation method of the anti-evaporation water-retaining material.

[0032] Figure 2 FE-SEM image of the white polymer emulsion of Example 1.

[0033] Figure 3 XRD image of the white polymer emulsion of Example 1. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with embodiments and drawings, and the schematic embodiments of the present application and the description thereof are only used for explaining the present application, and not as a limitation to the present application.

[0035] In the following description, a large number of specific details are set forth to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without these specific details. In other instances, well-known structures, circuits, materials or processes have not been described in detail in order to avoid obscuring the present application.

[0036] In the description throughout the specification, the mention of "one embodiment", "an embodiment", "one example" or "an example" means that the specific feature, structure or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present application. Therefore, the phrases "one embodiment", "an embodiment", "one example" or "an example" appearing in various places throughout the specification are not necessarily all referring to the same embodiment or example. In addition, specific features, structures or characteristics can be combined in any appropriate combination and / or sub-combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only, and the drawings are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the relevant listed items.

[0037] In the description of the present application, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the scope of protection of the present application.

[0038] Embodiment

[0039] To solve the technical problem that the utilization rate of rainwater is reduced due to the evaporation of rainwater stored in the existing water cellar being too fast, the embodiment of the present application provides a preparation method of an anti-evaporation water conservation material, a soft water cellar film and application. In a first aspect, the embodiment of the present application provides a preparation method of an anti-evaporation water conservation material, comprising:

[0040] S1. Dissolve water, alkyl sulfate and first fatty alcohol polyoxyethylene ether to obtain a mixed solution;

[0041] S2. Add liquid antievaporation agent, second fatty alcohol polyoxyethylene ether, pre-mixed alpha-methyl acrylic acid, first ethylene glycol diacrylate and dibenzoyl peroxide to the mixed solution to mix and emulsify, to obtain an emulsion;

[0042] S3. After the emulsion is reacted at a high temperature, add an aqueous solution of potassium persulfate to continue the reaction, to obtain a core layer solution;

[0043] S4. Mix vinyl acetate, butyl acrylate, hydroxyethyl acrylate and second ethylene glycol diacrylate to obtain a shell layer solution;

[0044] S5. Add the shell layer solution to the core layer solution to react, to obtain an antievaporation water-retaining material.

[0045] Therefore, the embodiment of the present application coats the antievaporation agent by using the nanometer core-shell coating technology and the supramolecular controlled release technology, prepares a white polymer emulsion containing the antievaporation agent, and then dries and melts the white polymer emulsion with low-density polyethylene to produce a soft water cellar film with the antievaporation function. Different from the traditional plastic film, the soft water cellar film containing the antievaporation agent in the present application can precipitate and float to the water surface to form a nanometer-level hydrophobic small molecule film during use, so as to achieve the water-retaining effect. Therefore, the embodiment of the present application has the characteristics of green, environmental protection, simple process flow and easy implementation, and the related products can be widely used to replace the traditional plastic film and applied to the next generation of soft water cellar.

[0046] Further, S5. adding the shell layer solution to the core layer solution to react, to obtain an antievaporation water-retaining material, comprises:

[0047] S51. adding the shell layer solution to the core layer solution to react, to obtain a white polymer emulsion;

[0048] S52. spray drying the white polymer emulsion to obtain a white nanoparticle powder;

[0049] S53. melting the white nanoparticle powder with polyethylene to prepare a polymer film.

[0050] Further, the antievaporation agent is one or more of sorbitol, octanol, decanol, lauryl alcohol, coconut oil, octanoic acid, decanoic acid or lauric acid; and the alkyl sulfate is dodecyl sulfate.

[0051] Further, the mass ratio of water, alkyl sulfate and first fatty alcohol polyoxyethylene ether is 800-1000: 1-1.5: 1.5-2.

[0052] Further, the mass ratio of water, alkyl sulfate and the first fatty alcohol polyoxyethylene ether, the anti-evaporation agent, alpha-methacrylic acid, the first ethylene glycol diacrylate, dibenzoyl peroxide and the second fatty alcohol polyoxyethylene ether is 800-1000:1-1.5:1.5-2:100-120:10-15:2-3:0.1-0.5:1.5-2.

[0053] Further, the mass ratio of vinyl acetate, butyl acrylate, hydroxyethyl acrylate and the second ethylene glycol diacrylate is 75-100:10-15:10-12:2-3.

[0054] Further, the liquid anti-evaporation agent, the second fatty alcohol polyoxyethylene ether, the pre-mixed alpha-methacrylic acid, the first ethylene glycol diacrylate and the dibenzoyl peroxide are added to the mixed solution for mixing and emulsification to obtain an emulsion, including:

[0055] The anti-evaporation agent is heated into a liquid and added to the mixed solution with the pre-mixed alpha-methacrylic acid, the first ethylene glycol diacrylate and the dibenzoyl peroxide, and emulsified by stirring at 45-55℃ water bath and 1300-1600rpm for 0.5-1h to obtain an emulsion.

[0056] Further, after the emulsion is warmed and reacted, an aqueous solution of potassium persulfate is added for further reaction to obtain a core layer solution, including:

[0057] The emulsion is warmed to 70-80℃, reacted at 250-500rpm for 1.5-2.5h, and then an aqueous solution of potassium persulfate is added for further reaction for 10-20min to obtain a core layer solution; wherein the mass ratio of potassium persulfate to water in the aqueous solution of potassium persulfate is 1.5-2:200-250.

[0058] The shell layer solution is added to the core layer solution for reaction to obtain a white polymer emulsion, including:

[0059] The shell layer solution is uniformly added to the core layer solution by a peristaltic pump or a separatory funnel within 2-3h, and then incubated for 2h, and then warmed to 75-85℃, and a trace amount of KPS is added for further incubation for 1h to obtain a white polymer emulsion.

[0060] In a second aspect, the embodiment of the present application provides a soft water cellar film made of the anti-evaporation and water-retention material prepared by the preparation method of the anti-evaporation and water-retention material.

[0061] In a third aspect, the embodiment of the present application provides a use of the anti-evaporation and water-retention material prepared by the preparation method of the anti-evaporation and water-retention material for preventing rainwater evaporation in a water cellar.

[0062] Therefore, the anti-evaporation agent in the embodiment of the present application can be controlled to release, when a small molecule anti-evaporation agent (a surfactant) is added, a controlled release technology with a supramolecular lock shell is used, a small molecule anti-evaporation agent with a small polarity is selected, and then another substance with a polarity is selected to wrap the small molecule anti-evaporation agent, at this time, it is difficult for the small molecule anti-evaporation agent to diffuse out, which is the principle of using supramolecular interaction to realize the controlled release of the anti-evaporation agent, so that the long-term anti-evaporation of the small molecule film is achieved. The present application uses vinyl acetate, butyl acrylate, hydroxyethyl acrylate and ethylene glycol dimethacrylate to melt blend to obtain a shell solution, and the anti-evaporation agent small molecule is wrapped to realize the controlled release of the anti-evaporation agent.

[0063] (2) In the whole product preparation process, the chemical reagents involved are green and environmentally friendly, and the waste liquid generated in the preparation process is completely treated according to the harmless principle to the environment. The whole production process is carried out in accordance with the green and environmentally friendly standard.

[0064] (3) When the product is applied to a soft water cellar, the stored water spreads on the surface of the soft water cellar film with the anti-evaporation function. Because the anti-evaporation agent is added in the film, a small molecule film will be slowly released from the soft water cellar film with the anti-evaporation function in a long time range. Because the density of the small molecule film is smaller than that of water, the small molecule film will float to the surface of the water body, so that the soft water cellar has the characteristics of preventing water evaporation, and has a long service life.

[0065] Example 1

[0066] The preparation method of the anti-evaporation and water-retention material comprises the following steps:

[0067] (1) Preparation of anti-evaporation agent polymer emulsion sample

[0068] In the preparation process of the anti-evaporation agent polymer emulsion sample, the monomer is dispersed in water to form an emulsion by means of an emulsifier and mechanical stirring, and then an initiator is added to initiate polymerization of the monomer. The specific process steps are as follows:

[0069] Step 1: 800g of H2O, 1g of sodium dodecyl sulfate and 1.5g of fatty alcohol polyoxyethylene ether are added to a three-necked flask, and stirred uniformly at room temperature until completely dissolved.

[0070] Step 2: 100g of lauryl alcohol is heated (50℃) to become liquid, then 10g of α-methyl acrylic acid, 2g of ethylene glycol diacrylate, 0.1g of dibenzoyl peroxide and 1.5g of MOA-5 (dibenzoyl peroxide is uniformly mixed with α-methyl acrylic acid and ethylene glycol diacrylate in advance) are quickly added to the three-necked flask, and emulsified under the conditions of 50℃ water bath heating and 1500rpm stirring for 0.5h-1h.

[0071] Step 3: After step 2 is completed, the temperature is raised to 75°C, and the rotation speed is reduced to 300 rpm for 2 h.

[0072] Step 4: After step 3 is completed, 1.5 g of KPS (potassium persulfate) and 200 g of H2O are added to the three-necked flask (KPS and water are mixed uniformly before being added), and the reaction is allowed to proceed for 15 min.

[0073] Step 5: Shell layer solution preparation: 75 g of VAc (vinyl acetate), 10 g of BA (butyl acrylate), 10 g of HEA (hydroxyethyl acrylate), and 2 g of ethylene glycol diacrylate are added to a beaker and stirred uniformly for later use.

[0074] Step 6: After step 4 is completed, the shell layer solution is added dropwise into the core layer solution using a peristaltic pump or a separatory funnel within 2-3 h, and then incubated for 2 h. The temperature is raised to 80°C, a small amount of KPS is added, and the incubation is continued for another 1 h. The reaction is completed, and a white polymer emulsion sample is obtained.

[0075] The FE-FE-SEM image of the white polymer emulsion is shown in reference Figure 1 The XRD image of the white polymer emulsion is shown in reference Figure 2 .

[0076] (2) Spray drying of the anti-evaporation agent polymer emulsion sample

[0077] After obtaining the white polymer emulsion sample, spray drying is performed to obtain an anti-evaporation agent white nanoparticle powder.

[0078] (3) Melting and film blowing of the anti-evaporation agent white particle powder

[0079] The prepared anti-evaporation agent white nanoparticle powder is melted with linear low-density polyethylene in a film blowing machine, extruded from a cylindrical thin tube, and compressed air is blown from the center of the die head to inflate the thin tube. The cooled film tube is guided to the traction roller to form a double-folded film. The film is continuously stretched in the longitudinal direction on the traction roller, and air cannot leak out from the cylindrical film between the extruder head and the traction roller, ensuring that the air volume in the film tube remains constant. The blown film has a certain width and uniformity, and enters the winding device at a constant linear speed to form a product, producing a polymer sample film.

[0080] Example 2

[0081] The preparation method of the anti-evaporation water-retention material comprises:

[0082] (1) Preparation of anti-evaporation agent polymer emulsion sample

[0083] In the preparation of the antievaporation agent polymer emulsion sample, the monomers are dispersed in water to form an emulsion by means of an emulsifier and mechanical stirring, and then an initiator is added to initiate polymerization of the monomers. The specific process steps are as follows:

[0084] Step 1: Add 1000g H2O, 1.5g sodium dodecyl sulfate, and 2g fatty alcohol polyoxyethylene ether into a three-necked flask, and stir uniformly at room temperature until completely dissolved.

[0085] Step 2: After heating (50℃) 120g lauryl alcohol to become liquid, 15g α-methacrylic acid, 3g ethylene glycol diacrylate, 0.5g dibenzoyl peroxide, and 2g MOA-5 (dibenzoyl peroxide is uniformly mixed with α-methacrylic acid and ethylene glycol diacrylate in advance) are quickly added to the three-necked flask, and emulsification is carried out under the conditions of 50℃ water bath heating and 1500rpm stirring for 0.5h-1h.

[0086] Step 3: After step 2 is completed, the temperature is raised to 75℃, and the stirring speed is reduced to 300rpm for 2h of reaction.

[0087] Step 4: After step 3 is completed, 2g KPS (potassium persulfate) and 250g H2O are added to the three-necked flask (KPS is uniformly mixed with water before being added), and the reaction is carried out for 15min.

[0088] Step 5: Shell solution is prepared: 100g VAc (vinyl acetate), 15g BA (butyl acrylate), 12g HEA (hydroxyethyl acrylate), and 3g ethylene glycol diacrylate are added to a beaker and stirred uniformly for standby use.

[0089] Step 6: After step 4 is completed, the shell solution is added dropwise into the core solution uniformly within 2-3h by using a peristaltic pump or a separatory funnel, and then the temperature is maintained for 2h. After the temperature is raised to 80℃, a small amount of KPS is added, and then the temperature is maintained for 1h. The reaction is completed, and a white polymer emulsion sample is obtained.

[0090] (2) Spray drying of the antievaporation agent polymer emulsion sample

[0091] After obtaining the white polymer emulsion sample, spray drying is carried out to obtain an antievaporation agent white nanoparticle powder.

[0092] (3) Melting and film blowing of the antievaporation agent white particle powder

[0093] The prepared anti-evaporation agent white nanoparticle powder is melted with low-density polyethylene in a film blowing machine, extruded from a cylindrical thin tube, and compressed air is blown into the center of the extruder head to inflate the thin tube. The cooled film tube is guided to the traction roller to form a double-folded film. The film is continuously stretched in the longitudinal direction on the traction roller, and air cannot leak out of the cylindrical film between the extruder head and the traction roller, ensuring that the air volume in the film tube is constant. The blown film has a certain width and uniformity, and enters the winding device at a constant linear speed to be wound into a product, producing a polymer sample film.

[0094] Example 3

[0095] The preparation method of the anti-evaporation water-retention material comprises:

[0096] (1) Preparation of anti-evaporation agent polymer emulsion sample

[0097] During the preparation of the anti-evaporation agent polymer emulsion sample, the monomers are dispersed in water to form an emulsion with the help of an emulsifier and mechanical stirring, and an initiator is added to initiate polymerization of the monomers. The specific process steps are as follows:

[0098] Step 1: Add 800g H2O, 1g sodium dodecyl sulfate, and 1.5g fatty alcohol polyoxyethylene ether to a three-necked flask and stir uniformly at room temperature until completely dissolved.

[0099] Step 2: Heat 100g sorbitol (50℃) to a liquid state, then quickly add 10g α-methyl acrylic acid, 2g ethylene glycol diacrylate, 0.1g dibenzoyl peroxide, and 1.5g MOA-5 (dibenzoyl peroxide is pre-mixed with α-methyl acrylic acid and ethylene glycol diacrylate) to the three-necked flask. Stir at 50℃ water bath and 1500rpm for 0.5h-1h for emulsification.

[0100] Step 3: After step 2 is completed, increase the temperature to 75℃ and reduce the stirring speed to 300rpm for 2h of reaction.

[0101] Step 4: After step 3 is completed, add 1.5g KPS (potassium persulfate) and 200g H2O (KPS is mixed with water and then added) to the three-necked flask and react for 15min.

[0102] Step 5: Prepare the shell solution: add 75g VAc (vinyl acetate), 10g BA (butyl acrylate), 10g HEA (hydroxyethyl acrylate), and 2g ethylene glycol diacrylate to a beaker and stir uniformly for standby.

[0103] Step 6: After the completion of Step 4, the shell solution is added evenly into the core solution by using a peristaltic pump or a separatory funnel within 2-3 hours, and then incubated for 2 hours. After the temperature is raised to 80°C, a small amount of KPS is added, and then incubated for another 1 hour. The reaction is completed, and a white polymer emulsion sample is obtained.

[0104] (2) Spray drying the anti-evaporation agent polymer emulsion sample

[0105] After obtaining the white polymer emulsion sample, spray drying is performed to obtain an anti-evaporation agent white nanoparticle powder.

[0106] (3) Melting and blowing film of the anti-evaporation agent white particle powder

[0107] The prepared anti-evaporation agent white nanoparticle powder is melted with the metallocene polyethylene in a film blowing machine, extruded from a cylindrical thin tube, and compressed air is blown from the center of the head to inflate the thin tube. The cooled film tube is guided to the traction roller to form a double-folded film. The film is continuously stretched in the longitudinal direction on the traction roller, and air cannot leak out from the cylindrical film between the extruder head and the traction roller, thereby ensuring a constant amount of air in the film tube. The blown film has a certain width and uniformity, enters the winding device at a constant linear speed, and is wound into a product. The polymer sample film is produced.

[0108] Example 4

[0109] The preparation method of the anti-evaporation water-retention material comprises:

[0110] (1) Preparing an anti-evaporation agent polymer emulsion sample

[0111] During the preparation of the anti-evaporation agent polymer emulsion sample, the monomers are dispersed in water to form an emulsion with the help of emulsifiers and mechanical stirring, and then an initiator is added to initiate the polymerization of the monomers. The specific process steps are as follows:

[0112] Step 1: Add 1000g of H2O, 1.5g of sodium dodecyl sulfate, and 2g of fatty alcohol polyoxyethylene ether into a three-necked flask, and stir uniformly at room temperature until completely dissolved.

[0113] Step 2: After heating (50°C) 120g of sorbitol to become liquid, 15g of α-methyl acrylic acid, 3g of ethylene glycol diacrylate, 0.5g of dibenzoyl peroxide, and 2.0g of MOA-5 (dibenzoyl peroxide is pre-mixed with α-methyl acrylic acid and ethylene glycol diacrylate) are quickly added to the three-necked flask. Stir at 50°C water bath and 1500rpm for 0.5-1h for emulsification.

[0114] Step 3: After the completion of Step 2, raise the temperature to 75°C, and reduce the stirring speed to 300rpm for 2h.

[0115] Step 4: After step 3 is completed, 2g of KPS (potassium persulfate) and 250g of H2O are added to a three-necked flask (KPS and water are mixed well before adding) and reacted for 15 minutes.

[0116] Step 5: Configure the shell layer solution: add 100g of VAc (vinyl acetate), 15g of BA (butyl acrylate), 12g of HEA (hydroxyethyl acrylate), and 3g of ethylene glycol diacrylate into a beaker and stir well for use.

[0117] Step 6: After step 4 is completed, the shell layer solution is added evenly into the core layer solution using a peristaltic pump or a separatory funnel within 2-3 hours, then incubate for 2 hours, and then incubate for another hour after the temperature is raised to 80°C and a small amount of KPS is added. The reaction is complete, and a white polymer emulsion sample is obtained.

[0118] (2) Spray drying of the anti-evaporation agent polymer emulsion sample

[0119] After obtaining the white polymer emulsion sample, spray drying is performed to obtain the anti-evaporation agent white nanoparticle powder.

[0120] (3) Melting and film blowing of the anti-evaporation agent white particle powder

[0121] The prepared anti-evaporation agent white nanoparticle powder is melted with linear low-density polyethylene in a film blowing machine, extruded from a cylindrical thin tube, and compressed air is blown from the center of the die head to inflate the thin tube. The cooled film tube is guided to the traction roller to form a double-folded film. The film is continuously stretched in the longitudinal direction on the traction roller, and air cannot leak out from the cylindrical film between the extruder head and the traction roller, ensuring that the air volume in the film tube remains constant. The blown film has a certain width and uniformity, and enters the winding device at a constant linear speed to form a product, producing a polymer sample film.

[0122] To test the actual use effect of the soft water cellar film with anti-evaporation function, a square open container with a volume of 10x10x10cm 3 is used. The soft water cellar film with anti-evaporation function obtained by the method described in Examples 1 to 4 is tightly attached to the inner wall of the container, and ordinary plastic film is also attached. Water is filled into the container to form a test box with a volatilization area of 10x10cm 2 . The volatilization rate under different temperature conditions is tested, and the test results are shown in Table 1.

[0123] Table 1 shows the anti-evaporation performance test of the soft water cellar film with anti-evaporation function

[0124]

[0125] Example 5

[0126] The embodiment of the present application provides a preparation method of an anti-evaporation water-retaining material, comprising the following steps:

[0127] 800:1:1.5 of water, alkyl sulfate and the first fatty alcohol polyoxyethylene ether are uniformly mixed and dissolved to obtain a mixed solution; an anti-evaporation agent is heated into a liquid and added into the mixed solution with pre-uniformly mixed alpha-methacrylic acid, the first ethylene glycol dipropylene acrylate and dibenzoyl peroxide, and emulsified under the conditions of a 45 DEG C water bath and 1300 rpm stirring for 0.5 h to obtain an emulsion; the anti-evaporation agent is sorbitol, octanol, decanol, lauryl alcohol, coconut oil, octanoic acid, decanoic acid or lauric acid; wherein the mass ratio of water, alkyl sulfate and the first fatty alcohol polyoxyethylene ether, the anti-evaporation agent, alpha-methacrylic acid, the first ethylene glycol dipropylene acrylate, dibenzoyl peroxide and the second fatty alcohol polyoxyethylene ether is 800:1:1.5:100:10:2:0.1:1.5; the emulsion is heated to 70 DEG C, and reacted for 1.5 h at 250 rpm, and then an aqueous solution of potassium persulfate is added to continue to react for 10 min to obtain a core layer solution; wherein the mass ratio of potassium persulfate and water in the aqueous solution of potassium persulfate is 1.5:200; 75:10:10:2 of vinyl acetate, butyl acrylate, hydroxyethyl acrylate and the second ethylene glycol dipropylene acrylate are uniformly mixed to obtain a shell layer solution; the shell layer solution is uniformly added into the core layer solution by using a peristaltic pump or a separatory funnel within 2 h, and then incubated for 2 h, and then heated to 75 DEG C, and a trace amount of KPS is added to continue to incubate for 1 h to obtain a white polymer emulsion; the white polymer emulsion is spray dried to obtain a white nanoparticle powder; and the white nanoparticle powder is melted with low-density polyethylene to prepare a polymer film.

[0128] Example 6

[0129] Mixing and dissolving water, alkyl sulfate and first fatty alcohol polyoxyethylene ether with mass ratio of 1000:1.5:2 to obtain a mixed solution; adding antievaporation agent heated into liquid, pre-mixed α-methacrylic acid, first ethylene glycol diacrylate and dibenzoyl peroxide into the mixed solution, stirring at 55℃ water bath and 1600rpm for 1h to emulsify, obtaining an emulsion; the antievaporation agent is sorbitol, octanol, decanol, lauryl alcohol, coconut oil, octanoic acid, decanoic acid or lauric acid; wherein the mass ratio of water, alkyl sulfate and first fatty alcohol polyoxyethylene ether, antievaporation agent, α-methacrylic acid, first ethylene glycol diacrylate, dibenzoyl peroxide and second fatty alcohol polyoxyethylene ether is 1000:1.5:2:120:15:3:0.5:2; heating the emulsion to 80℃, reacting at 500rpm for 2.5h, then adding potassium persulfate aqueous solution to continue reacting for 20min to obtain a core layer solution; wherein the mass ratio of potassium persulfate and water in the potassium persulfate aqueous solution is 2:200; mixing vinyl acetate, butyl acrylate, hydroxyethyl acrylate and second ethylene glycol diacrylate with mass ratio of 100:15:12:3 to obtain a shell layer solution; adding the shell layer solution into the core layer solution with peristaltic pump or separatory funnel within 3h, then keeping warm for 2h, then heating to 85℃, adding trace amount of KPS and keeping warm for 1h to obtain white polymer emulsion; spray drying the white polymer emulsion to obtain white nanoparticle powder; melting the white nanoparticle powder with LDPE to prepare a polymer film.

[0130] Example 7

[0131] Mixing and dissolving water, alkyl sulfate and first fatty alcohol polyoxyethylene ether with mass ratio of 900:1.2:1.6 to obtain a mixed solution; adding antievaporation agent heated into liquid, pre-mixed α-methyl acrylic acid, first ethylene glycol diacrylate and dibenzoyl peroxide into the mixed solution, stirring at 50℃ water bath, 1500rpm for 1h to obtain an emulsion; the antievaporation agent is sorbitol, octanol, decanol, lauryl alcohol, coconut oil, octanoic acid, decanoic acid or lauric acid; wherein the mass ratio of water, alkyl sulfate and first fatty alcohol polyoxyethylene ether, antievaporation agent, α-methyl acrylic acid, first ethylene glycol diacrylate, dibenzoyl peroxide and second fatty alcohol polyoxyethylene ether is 9000:1.2:1.7:110:12:2.5:0.4:18; heating the emulsion to 75℃, reacting for 2h at 300pm, then adding potassium persulfate aqueous solution to continue reacting for 14min to obtain a core layer solution; wherein the mass ratio of potassium persulfate and water in the potassium persulfate aqueous solution is 1.8:220; mixing vinyl acetate, butyl acrylate, hydroxyethyl acrylate and second ethylene glycol diacrylate with mass ratio of 85:12:11:2.5 to obtain a shell layer solution; adding the shell layer solution into the core layer solution uniformly by peristaltic pump or separatory funnel within 2.5h, then incubating for 2h, then heating to 80℃, adding trace amount of KPS to continue incubating for 1h to obtain a white polymer emulsion; spray drying the white polymer emulsion to obtain white nanoparticle powder; melting the white nanoparticle powder with low-density polyethylene to prepare a polymer film.

[0132] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing an anti-evaporation and water-retaining material, characterized in that, include: Water, alkyl sulfate and first fatty alcohol polyoxyethylene ether are mixed and dissolved to obtain a mixture; The liquid anti-evaporation agent, the second fatty alcohol polyoxyethylene ether, and the pre-mixed α-methacrylic acid, the first ethylene glycol diacrylate, and benzoyl peroxide are added to the mixture and mixed well, then emulsified to obtain an emulsion. After the emulsion is heated and reacted, an aqueous solution of potassium persulfate is added to continue the reaction, resulting in a core layer solution. Vinyl acetate, butyl acrylate, hydroxyethyl acrylate and second ethylene glycol diacrylate are mixed to obtain a shell solution. The shell solution was added to the core solution and reacted to obtain a white polymer emulsion; The white polymer emulsion was spray-dried to obtain white nanoparticle powder; The white nanoparticle powder is melted with polyethylene to form a polymer film, thus obtaining an anti-evaporation and water-retaining material.

2. The preparation method of the anti-evaporation and water-retaining material as described in claim 1, characterized in that, The anti-evaporation agent is one or more of sorbitol, octanol, decanol, lauryl alcohol, coconut oil, caprylic acid, decanoic acid, or lauric acid; the alkyl sulfate is dodecyl sulfate.

3. The preparation method of the anti-evaporation and water-retaining material as described in claim 1, characterized in that, The mass ratio of water, alkyl sulfate and first fatty alcohol polyoxyethylene ether is 800-1000:1-1.5:1.5-2.

4. The preparation method of the anti-evaporation and water-retaining material as described in claim 3, characterized in that, The mass ratio of water, alkyl sulfate, first fatty alcohol polyoxyethylene ether, anti-evaporation agent, α-methacrylic acid, first ethylene glycol diacrylate, benzoyl peroxide, and second fatty alcohol polyoxyethylene ether is 800-1000:1-1.5:1.5-2:100-120:10-15:2-3:0.1-0.5:1.5-2.

5. The preparation method of the anti-evaporation and water-retaining material as described in claim 4, characterized in that, The mass ratio of vinyl acetate, butyl acrylate, hydroxyethyl acrylate, and second ethylene glycol diacrylate is 75-100:10-15:10-12:2-3.

6. The method for preparing the anti-evaporation and water-retaining material as described in claim 1, characterized in that, The liquid anti-evaporation agent, the second fatty alcohol polyoxyethylene ether, and pre-mixed α-methacrylic acid, ethylene glycol diacrylate, and benzoyl peroxide are added to the mixture and stirred until homogeneous and emulsified to obtain an emulsion; comprising: The anti-evaporation agent is heated into a liquid and then added to a pre-mixed mixture of α-methacrylic acid, ethylene glycol diacrylate, and benzoyl peroxide. The mixture is then stirred for 0.5-1 h in a water bath at 45-55℃ and at 1300-1600 rpm to emulsify, thus obtaining an emulsion.

7. The method for preparing the anti-evaporation and water-retaining material as described in claim 1, characterized in that, After the emulsion is heated and reacted, an aqueous solution of potassium persulfate is added to continue the reaction, yielding a core layer solution; including: The emulsion is heated to 70-80℃ and reacted at 250-500 rpm for 1.5-2.5 hours. Then, an aqueous solution of potassium persulfate is added and the reaction continues for 10-20 minutes to obtain the core layer solution. The mass ratio of potassium persulfate to water in the aqueous solution is 1.5-2:200-250. The shell solution was added to the core solution to react, resulting in a white polymer emulsion comprising: The shell solution was added dropwise to the core solution over 2-3 hours using a peristaltic pump or separatory funnel. The mixture was then kept at this temperature for 2 hours, then heated to 75-85°C. A trace amount of KPS was added, and the mixture was kept at this temperature for another hour to obtain a white polymer emulsion.

8. A flexible water cellar membrane, characterized in that, The anti-evaporation water-retaining material prepared by the preparation method of any one of claims 1-7 is made together with a polymer film prepared of polyethylene.

9. The anti-evaporation water-retaining material prepared by the method of any one of claims 1-7 is used for preventing rainwater evaporation in water cellars.

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