Water-based erucyl amide emulsion for powder activation and coating and preparation method of water-based erucyl amide emulsion

Abstract

The invention relates to the field of lubricants, and particularly discloses a water-based erucyl amide emulsion for powder activation and coating and a preparation method of the water-based erucyl amide emulsion. A water-based erucyl amide emulsion for powder activation and coating is characterized by comprising the following raw materials in parts by weight: 30-40 parts of erucyl amide, 60-70 parts of deionized water, 4-8 parts of a dispersing agent, 1-2 parts of a solubilizer, 1-3 parts of an emulsifying agent, 1.5-3.5 parts of a defoaming agent, 1-1.5 parts of an anti-settling agent and 0.3-0.9 part of an anti-settling stabilizer. The anti-settling agent comprises polyethylene glycol and nano silicon dioxide in a mass ratio of (0.2-0.4): 1. The water-based erucyl amide emulsion can be used for coating and activating powder particles, the dispersity of the powder particles in plastic products is improved, the water-based erucyl amide emulsion is good in dispersity and not prone to layering and precipitation, and the prepared plastic products are good in transparency, smooth in surface and high in ultraviolet discoloration resistance and aging resistance.

Description

Technical Field

[0001] The present application relates to the technical field of lubricants, and more specifically, to a water-based erucamide emulsion for powder activation coating and a preparation method thereof. Background Art

[0002] Plastic raw materials can only be made into plastic products through processing. The most commonly used methods for molding (thermoplastic) under high temperature conditions are extrusion, injection molding, calendering, casting, blow molding, vacuum forming and thermoforming. Plastic materials have the advantages of light weight, high strength, excellent electrical properties, easy processing and molding, and bright colors. Generally, in order to enhance the hardness and strength of plastic products, reduce costs, and improve dimensional stability, appropriate amounts of powders such as calcium carbonate and talcum powder are added to plastic products. In order to increase the uniformity of dispersion of these powders in the plastic substrate and reduce the effect of powders on the transparency of plastic products, lubricants are added to plastic products. Lubricants can increase the dispersed particles between powders, reduce powder agglomeration, and significantly reduce the friction coefficient of plastic products, improve transparency and gloss, increase antistatic effects, and reduce dust accumulation. At present, the commonly used lubricant is erucamide, which has a high melting point and good thermal stability.

[0003] When preparing plastic products, generally, various raw materials, such as plastic substrate, powder, lubricant and other additives, are directly mixed and then hot-melted. In this process, erucic acid amide may have been hot-melted but not mixed evenly with the powder. Therefore, erucic acid amide cannot fully cover the powder particles when it is melted, thereby reducing the coating and lubrication effect on the powder particles, and further affecting the dispersibility of the powder particles in the plastic products, resulting in a certain impact on the transparency and friction coefficient of the plastic products. With respect to the above-mentioned related technologies, the inventors found that there is currently a situation where erucic acid amide is made into erucic acid amide emulsion and used as a lubricant, but the erucic acid amide has a large particle size, is not easy to disperse, and is easy to precipitate. After being left for a long time, flocculation and stratification will occur. Summary of the invention

[0004] In order to improve the anti-stratification and anti-precipitation effects of aqueous erucamide emulsion, the present application provides an aqueous erucamide emulsion for powder activation coating and a preparation method thereof.

[0005] In the first aspect, the present application provides a water-based erucamide emulsion for powder activation coating, which adopts the following technical solution: A water-based erucic acid amide emulsion for powder activation coating, comprising the following raw materials in parts by weight: 30-40 parts of erucic acid amide, 60-70 parts of deionized water, 4-8 parts of dispersant, 1-2 parts of solubilizer, 1-3 parts of emulsifier, 1.5-3.5 parts of defoamer, 1-1.5 parts of anti-settling agent, and 0.3-0.9 parts of anti-settling stabilizer; The anti-settling agent comprises polyethylene glycol and nano silicon dioxide in a mass ratio of 0.2-0.4:1.

[0006] By adopting the above technical solution, the long carbon chain in the erucamide molecule enables the amide molecule to form an ordered molecular film. This ordered molecular film can be adsorbed on the surface of the powder particles to form a lubricating film, which significantly reduces the adhesion between the powder particles, thereby improving the fluidity and dispersibility of the powder, reducing the friction coefficient, and reducing wear. Moreover, the long carbon chain and double bonds in the erucamide molecule work together to make the formed friction lubricating film denser and more stable, further enhancing the lubricating effect of erucamide. In addition, erucamide also has a high melting point and good thermal stability (stable at 273°C), can maintain stable lubrication performance in a high temperature environment, and also has good chemical stability, is not easy to react with other substances, and improves the stability of the powder particles.

[0007] The method uses dispersants, emulsifiers, solubilizers, anti-settling agents and other components to disperse and dissolve erucamide. The emulsifier can be adsorbed on the interface of erucamide and deionized water to reduce interfacial tension and promote the effective dispersion of erucamide in deionized water, thereby forming a stable emulsion. The dispersant helps to further refine erucamide particles and prevent them from agglomerating in water. The dispersant is adsorbed on the surface of erucamide particles to form a protective layer to prevent the interaction between erucamide particles and maintain the stability of the emulsion. The solubilizer can increase the solubility of erucamide in water, making it easier to disperse in deionized water. By changing the polarity of water, erucamide molecules are more likely to interact with water molecules. Nano-silica and polyethylene glycol are used as anti-settling agents. Polyethylene glycol is a colorless and transparent liquid produced by oxidation and polymerization reaction. It has good solubility and compatibility. It can be completely dissolved in deionized water. It has high viscosity and adhesion. It can effectively increase the viscosity of erucamide emulsion and slow down the sedimentation rate of erucamide in the emulsion, thereby improving the dispersion effect and emulsion stability. Silica is white carbon black, which has excellent thickening, leveling and anti-precipitation properties. Silica and polyethylene glycol are mixed as anti-settling agents. Polyethylene glycol The molecular chain has a special structure and hydrophilicity, which can form hydrogen bonds with the surface of silica, thereby improving the dispersibility of silica and reducing the possibility of agglomeration. The improvement in dispersibility helps prevent the sedimentation of erucamide. Silica and polyethylene glycol can form a chain-like three-dimensional network structure through hydrogen bonding. In the absence of external force, the bridge effect of the hydrogen bond and the ionic bond force of nano-silica are in dynamic balance, thereby increasing the suspension of erucamide in the emulsion by constructing a network system and reducing the possibility of stratification and sedimentation.

[0008] Optionally, the preparation method of the anti-settling agent is as follows: Nano silicon dioxide is dispersed in deionized water to form a suspension with a concentration of 2-2.5wt%, the pH is adjusted to 2-2.5, ultrasonicated for 5-10 minutes, carboxylate is added, polyethylene glycol is added after stirring and dispersing for 20-30 minutes, and the mixture is mixed and stirred to obtain an anti-settling agent, wherein the mass ratio of carboxylate to nano silicon dioxide is 0.01-0.02:1.

[0009] By adopting the above technical scheme, carboxylates are used to modify silica, carboxylates groups are grafted onto the surface of silica, and its surface properties are changed to make it have certain hydrophilicity and lipophilicity, and the surface has certain charges or functional groups, thereby improving its compatibility with polyethylene glycol, and the carboxylates groups grafted onto the surface of the modified silica can form certain steric hindrance to prevent the agglomeration of silica particles, thereby improving its dispersibility in polyethylene glycol, thereby achieving a better effect of preventing erucic acid amide particles from settling; when silica is in an acidic solution, hydrogen ions increase and combine with the negative charge on the surface of silica, so that its surface has a positive charge, The adsorption of carboxylates on the surface of nano-silica is a single-layer adsorption, because the negatively charged long-chain carboxylic acid ions are adsorbed on the positively charged silica surface due to electrostatic attraction, and the hydrophilic end of the ions is firmly bound to the surface of the polar particles, and the lipophilic end of the long chain produces enough steric hindrance in the aqueous dispersion system to have a stabilizing effect. In addition, because the carboxylates contain carboxyl groups that can react with the hydroxyl groups on the surface of silica, chemical adsorption can be formed, the adsorption is relatively firm, and electrostatic repulsion exists on the surface of silica, making the silica particles more dispersible and more stable, thereby constructing a more stable three-dimensional network structure with polyethylene glycol, thereby increasing the suspension and dispersion effect on erucamide.

[0010] Optionally, the carboxylate is selected from at least one of sodium acetate, sodium benzoate, sodium formate and sodium ethoxide.

[0011] Optionally, the anti-settling stabilizer is at least one of organic bentonite, polyamide wax, polyethylene wax and montmorillonite.

[0012] By adopting the above technical scheme, the anti-sedimentation stabilizer can prevent the erucamide particles from settling or aggregating in deionized water, and the organic bentonite, polyamide wax, etc. are all nearly transparent substances, and have excellent thixotropy and thickening properties, and can form a stable gel structure, so that the particles are easy to disperse when subjected to shear force, and maintain a stable state when stationary, and a lubricating film or protective film is formed on the surface of the erucamide particles to prevent direct contact and distance between the particles, and change the charge properties of the particle surface to generate electrostatic repulsion between the particles, maintain the dispersed state of the particles, and prevent the particles from settling.

[0013] Optionally, the organobentonite is pretreated as follows: Ultrasonic dispersion of organic bentonite in acid solution for 1-2 hours, boiling for 90-100 minutes, cooling, washing to neutrality, and suction filtering to obtain acidified organic bentonite; Disperse the acidified organic bentonite in deionized water, stir evenly to form a suspension with a concentration of 1.5-2wt%, add aluminum sulfate solution, adjust the pH to 5-6, let stand for 2-4 hours, wash, filter, dry at 105-110°C for 2-4 hours, and then roast at 300-320°C for 4-6 hours.

[0014] By adopting the above technical scheme, the organic bentonite is a hydrophobic substance, which cannot be fully infiltrated in an aqueous solution and contains some impurities. After being treated with acid, the impurities on the surface can be removed, and some impurities will be converted into hydroxyl groups or carboxyl groups, which greatly enhances the hydrophilicity of the organic bentonite and improves its dispersibility in water. Aluminum sulfate is hydrolyzed under acidic conditions and precipitated as aluminum hydroxide on the surface of the organic bentonite, forming an aluminum hydroxide coating layer, and then after roasting, the aluminum hydroxide is dehydrated to form aluminum oxide, and finally an alumina-coated organic bentonite is obtained. The alumina coating can improve the anti-ultraviolet effect of the organic bentonite and prevent the penetration of ultraviolet rays. Therefore, after the aqueous erucamide emulsion coats the powder particles, in plastic products, the anti-ultraviolet aging and discoloration capabilities of the plastic products can be improved.

[0015] Optionally, the solubilizing agent comprises polyvinyl pyrrolidone, sodium polyacrylate and polyethylene oxide in a mass ratio of 1:0.02-0.1:0.1-0.2.

[0016] By adopting the above technical scheme, polyvinyl pyrrolidone is a non-ionic polymer with excellent water solubility and film-forming properties. It can be combined with erucamide through intermolecular interaction to form a stable dispersion system, and polyvinyl pyrrolidone has excellent ultraviolet absorption performance. The conjugated structure in its molecule enables it to effectively absorb ultraviolet light and convert ultraviolet light into heat energy, thereby preventing ultraviolet light from having harmful effects on products, increasing the ability of plastic products to resist ultraviolet rays, and causing plastic products to oxidize and discolor; sodium polyacrylate is a cationic polymer with strong hydrophilicity and good dispersibility. It can be combined with erucamide molecules through charge interaction to form a stable emulsion. The molecular structure of sodium polyacrylate can absorb or scatter ultraviolet rays and is evenly distributed in plastic products to form a protective film that effectively blocks direct ultraviolet radiation, thereby reducing the penetration and damage of ultraviolet rays to the plastic film, preventing the plastic products from yellowing or aging, and extending the service life; polyethylene oxide is a polymer with a large number of ether bonds in its molecular chain, which makes polyethylene oxide have good water solubility and hydrophilicity, and the ether bonds can be combined with certain functional groups in the erucamide molecules. The energy groups (such as amide groups) form hydrogen bonds, and this hydrogen bonding effect can enhance the interaction between erucamide molecules and polyethylene oxide molecules, improve the dispersibility and stability of erucamide in water, and the molecular chain of polyethylene oxide can also form a certain steric hindrance effect, forming a protective layer around the erucamide molecules, preventing the aggregation and precipitation of erucamide molecules through the steric hindrance effect, which helps to stabilize the dispersion system, and polyethylene oxide can show properties similar to surfactants, and can form micelles or microemulsion structures in aqueous solutions, providing a good dispersion environment for erucamide molecules, reducing the interaction between erucamide molecules, making it easier to disperse in water, reducing aggregation and sedimentation; polyethylene oxide can form a protective layer on the surface of powder particles together with erucamide, blocking or absorbing part of ultraviolet rays, slowing down the erosion of ultraviolet rays on plastic products, and enhancing the resistance of plastic products to ultraviolet rays; therefore, the use of the three components as a solubilizer can effectively enhance the dispersibility of erucamide, while enhancing the anti-ultraviolet effect of erucamide, and can enhance the auxiliary anti-ultraviolet ability of erucamide in plastic products, and reduce the aging and discoloration of plastic products caused by ultraviolet rays.

[0017] Optionally, the dispersant is selected from at least one of polyoxyethylene ether, phosphate, and hydroxyethyl cellulose.

[0018] By adopting the above technical solution, polyoxyethylene ether and the like are used as dispersants for erucamide, which can effectively disperse erucamide particles and prevent particle agglomeration and precipitation, thereby achieving uniform dispersion.

[0019] Optionally, the emulsifier is selected from at least one of erythritol, oligosaccharides, paraffin, stearate and sodium dodecylbenzene sulfonate.

[0020] By adopting the above technical solution, the above various raw materials are used as emulsifiers to increase the stability of the emulsion, improve the fluidity and dispersibility of the emulsion, improve the lubricating effect of the emulsion, and prevent the agglomeration and precipitation of particles.

[0021] Optionally, the defoaming agent is selected from polyether-modified polydimethylsiloxane or polyoxyethylene polyoxypropanolamine ether.

[0022] By adopting the above technical scheme, the polyether-modified polydimethylsiloxane has ultra-low surface tension, super strong wetting and penetration properties, and has a long-lasting defoaming effect. The polyoxyethylene polyoxypropanolamine ether is a high molecular compound formed by connecting two segments of polyoxyethylene (POE) and polyoxypropylene (POP) through amide bonds. It has unique water solubility and surface activity, can maintain good solubility in the aqueous phase, and can play an efficient emulsifying, dispersing and stabilizing role at the oil phase or solid phase interface. The POE segment has strong hydrophilicity and can form hydrogen bonds with water molecules, making the molecules easy to disperse in water. The POP segment exhibits a certain hydrophobicity and can be adsorbed on the foam surface to reduce the stability of the foam.

[0023] In a second aspect, the present application provides a method for preparing a water-based erucic acid amide emulsion for powder activation coating, which adopts the following technical scheme: A method for preparing a water-based erucamide emulsion for powder activation coating comprises the following steps: Mixing a dispersant, a solubilizer, an emulsifier and deionized water, stirring at 30-35° C. for 10-20 minutes to obtain a stable solution; adding erucamide to the stable solution, stirring at 80-100° C. for 10-20 minutes to obtain a suspension; Adding an anti-settling agent, an anti-settling stabilizer and a defoaming agent to the suspension, stirring at 30-35° C. for 10-20 min, and then grinding for 6-7 h to obtain a mixed solution; The mixed solution is ultrasonically dispersed at 35-40° C. for 10-20 minutes to obtain an aqueous erucamide emulsion.

[0024] By adopting the above technical scheme, the dispersant, solubilizer, emulsifier and deionized water are first mixed, and then mixed with erucamide, which is melted by heating, mixed with a defoamer and the like and then ground, so that the particle size of erucamide can be reduced to the micron level or even the nanometer level, and then the erucamide is evenly dispersed by ultrasound, so that the emulsion system has excellent stability.

[0025] In summary, this application has the following beneficial effects: 1. Since the present application uses a mixture of polyethylene glycol and nano-silicon dioxide as an anti-settling agent, hydrogen bonding occurs between the two to form a three-dimensional network structure, thereby improving the suspension stability of erucamide particles, reducing the stratification and precipitation of erucamide, improving its dispersibility, and allowing the emulsion to be stored for a long time without the occurrence of flocculation and stratification.

[0026] 2. In the present application, organic bentonite, polyamide wax, etc. are preferably used as sedimentation stabilizers to improve the dispersion stability of erucamide. In addition, the organic bentonite is coated with aluminum sulfate, and alumina-coated organic bentonite is obtained after sintering, which can enhance the UV aging resistance of the organic bentonite. The erucamide emulsion is used to coat the powder particles. After adding them to plastic products, the UV yellowing resistance of the plastic products can be effectively improved, and the influence of ultraviolet radiation on the transparency and mechanical properties of the plastic products can be reduced.

[0027] 3. In the present application, polyvinyl pyrrolidone, sodium polyacrylate and polyethylene oxide are preferably used as solubilizers, which can not only further increase the dispersibility of erucamide, improve the lubricity and coating effect of erucamide emulsion, but also improve the anti-ultraviolet and anti-aging effects of erucamide. DETAILED DESCRIPTION

[0028] The following examples further illustrate the present application in detail.

[0029] Preparation Example 1-5 of Anti-settling Agent Preparation Example 1: Disperse 25 g of nano-silicon dioxide in deionized water to form a suspension with a concentration of 2.5 wt%, adjust the pH to 2.5, ultrasonicate at a power of 200 W for 10 min, add polyethylene glycol, mix and stir evenly at a speed of 1000 r / min to prepare an anti-settling agent, the mass ratio of nano-silicon dioxide to polyethylene glycol is 1:0.4, and the polyethylene glycol is polyethylene glycol 600.

[0030] Preparation Example 2: Disperse 20 g of nano-silicon dioxide in deionized water to form a suspension with a concentration of 2 wt%, adjust the pH to 2, ultrasonicate at a power of 300 W for 5 min, add polyethylene glycol, mix and stir evenly at a speed of 1000 r / min to prepare an anti-settling agent, the mass ratio of nano-silicon dioxide to polyethylene glycol is 1:0.2, and the polyethylene glycol is polyethylene glycol 600.

[0031] Preparation Example 3: The difference from Preparation Example 1 is that the polyethylene glycol is polyethylene glycol 6000.

[0032] Preparation Example 4: Disperse 20 g of nano-silicon dioxide in deionized water to form a suspension with a concentration of 2 wt%, adjust the pH to 2, ultrasonicate at a power of 300 W for 5 min, add carboxylate, stir and disperse at a speed of 1000 r / min for 20 min, then add polyethylene glycol, mix and stir evenly to prepare an anti-settling agent, the mass ratio of nano-silicon dioxide, polyethylene glycol and carboxylate is 1:0.2:0.01, the carboxylate is sodium acetate, and the polyethylene glycol is polyethylene glycol 600.

[0033] Preparation Example 5: Disperse 25g of nano-silicon dioxide in deionized water to form a suspension with a concentration of 2.5wt%, adjust the pH to 2.5, ultrasonicate at a power of 200W for 10min, add carboxylate, stir and disperse at a speed of 1000r / min for 30min, then add polyethylene glycol, mix and stir evenly to prepare an anti-settling agent, the mass ratio of nano-silicon dioxide, polyethylene glycol and carboxylate is 1:0.4:0.02, the carboxylate is sodium acetate, and the polyethylene glycol is polyethylene glycol 600. Example

[0034] Example 1: A water-based erucamide emulsion for powder activation coating, the raw material dosage is shown in Table 1, wherein the dispersant is polyoxyethylene ether, selected from Jiangsu Hai'an Petrochemical, model MOA-9, the solubilizer is dodecyl betaine, selected from Lusen, model BS-12, the emulsifier is erythritol, the defoamer is polyether modified polydimethylsiloxane, selected from Hubei Bolangwan Biological, model lbw, the anti-settling agent is prepared by Preparation Example 1, and the anti-settling stabilizer is organic bentonite.

[0035] The preparation method of the above-mentioned powder activation coating using aqueous erucamide emulsion comprises the following steps: S1. Mix the dispersant, solubilizer, emulsifier and deionized water, and stir at 30°C and 1000 r / min for 20 min to obtain a stable solution; S2, adding erucamide to the stabilizing solution, stirring at 100° C. and 800 r / min for 20 min to obtain a suspension; S3, adding an anti-settling agent, an anti-settling stabilizer and a defoaming agent to the suspension, stirring at 30° C. for 20 min, and then grinding for 7 h to obtain a mixed solution; S4. The mixed solution is ultrasonically dispersed at a frequency of 40 kHz at 35° C. for 20 minutes to obtain an aqueous erucamide emulsion.

[0036] Table 1 Raw material dosage of aqueous erucamide emulsion in Examples 1-3 Example 2: A powder activated coating with an aqueous erucamide emulsion, the raw material dosage is shown in Table 1, wherein the dispersant is hydroxyethyl cellulose, the solubilizer is dodecyl betaine, selected from Lusen, model BS-12, the emulsifier is sodium dodecylbenzene sulfonate, the defoamer is polyoxyethylene polyoxypropanolamine ether, the anti-settling agent is prepared by Preparation Example 2, and the anti-settling stabilizer is polyamide wax, selected from Foshan Shangzhou New Materials, model LY-6300.

[0037] The preparation method of the above-mentioned powder activation coating using aqueous erucamide emulsion comprises the following steps: S1. Mix the dispersant, solubilizer, emulsifier and deionized water, and stir at 35°C at a speed of 1000 r / min for 10 min to obtain a stable solution; S2, adding erucamide to the stabilizing solution, stirring at 80°C and 1000 r / min for 10 min to obtain a suspension; S3, adding an anti-settling agent, an anti-settling stabilizer and a defoaming agent to the suspension, stirring at 35° C. for 10 min, and then grinding for 6 h to obtain a mixed solution; S4. The mixed solution is ultrasonically dispersed at 40° C. and a frequency of 40 kHz for 10 minutes to obtain an aqueous erucamide emulsion.

[0038] Example 3: A powder activation coating using an aqueous erucamide emulsion, which is different from Example 1 in that the amounts of raw materials used are as shown in Table 1.

[0039] Example 4: A powder activated coating using an aqueous erucamide emulsion, which differs from Example 1 in that the anti-settling agent is prepared from Preparation Example 3.

[0040] Example 5: A powder activated coating using an aqueous erucamide emulsion, which differs from Example 1 in that the anti-settling agent is prepared from Preparation Example 4.

[0041] Example 6: A powder activation coating using an aqueous erucamide emulsion, which differs from Example 1 in that the anti-settling agent is prepared from Preparation Example 5.

[0042] Example 7: A powder activated coating using an aqueous erucamide emulsion, which is different from Example 6 in that the organic bentonite is pretreated as follows: 2g of organic bentonite is ultrasonically dispersed in an acid solution at a power of 200W for 2h, boiled for 100min, cooled, washed to neutrality, and filtered to obtain acidified organic bentonite, wherein the acid solution is prepared by mixing 50ml of concentrated nitric acid with a concentration of 63% and 100ml of distilled water; the acidified organic bentonite is dispersed in deionized water, stirred evenly to form a suspension with a concentration of 2wt%, and then a 60wt% aluminum sulfate solution is added, the pH is adjusted to 6, the mixture is allowed to stand for 4h, washed, filtered, dried at 105°C for 4h, and then calcined at 300°C for 6h, and the mass ratio of the acidified organic bentonite to the aluminum sulfate is 1:1.

[0043] Example 8: A powder activated coating using an aqueous erucamide emulsion, which differs from Example 6 in that the organic bentonite is pretreated as follows: 2g of organic bentonite is ultrasonically dispersed in an acid solution at a power of 200W for 1h, boiled for 90min, cooled, washed to neutrality, and filtered to obtain acidified organic bentonite, wherein the acid solution is prepared by mixing 50ml of concentrated nitric acid with a concentration of 63% and 100ml of distilled water; the acidified organic bentonite is dispersed in deionized water, stirred evenly to form a suspension with a concentration of 1.5wt%, and then a 60wt% aluminum sulfate solution is added, the pH is adjusted to 5, the suspension is allowed to stand for 2h, washed, filtered, dried at 110°C for 3h, and then roasted at 320°C for 4h, and the mass ratio of the acidified organic bentonite to the aluminum sulfate is 1:1.

[0044] Example 9: A water-based erucamide emulsion for powder activation coating, which differs from Example 8 in that the solubilizer includes polyvinyl pyrrolidone, sodium polyacrylate and polyethylene oxide in a mass ratio of 1:0.1:0.2, the polyethylene oxide has a molecular weight of 50,000, and is selected from Jining Huakai Resin Co., Ltd. with the product number PEO.

[0045] Example 10: A water-based erucamide emulsion for powder activation coating, which differs from Example 8 in that the solubilizer includes polyvinyl pyrrolidone, sodium polyacrylate and polyethylene oxide in a mass ratio of 1:0.02:0.1, the polyethylene oxide has a molecular weight of 50,000 and is selected from Jining Huakai Resin Co., Ltd. with the product number PEO.

[0046] Example 11: A powder activation coating using an aqueous erucamide emulsion, which differs from Example 10 in that the solubilizer is polyvinyl pyrrolidone.

[0047] Example 12: A water-based erucamide emulsion for powder activation coating, which differs from Example 10 in that the solubilizer comprises polyvinyl pyrrolidone and sodium polyacrylate in a mass ratio of 1:0.1.

[0048] Example 13: A water-based erucamide emulsion for powder activation coating, which differs from Example 10 in that the solubilizer includes polyvinyl pyrrolidone and polyethylene oxide in a mass ratio of 1:0.2, the polyethylene oxide has a molecular weight of 50,000, and is selected from Jining Huakai Resin Co., Ltd. with the product number PEO.

[0049] Example 14: A water-based erucamide emulsion for powder activation coating, which differs from Example 10 in that the solubilizer comprises sodium polyacrylate and polyethylene oxide in a mass ratio of 0.1:0.2, the polyethylene oxide has a molecular weight of 50,000, and is selected from Jining Huakai Resin Co., Ltd. with the product number PEO.

[0050] Comparative Example Comparative Example 1: A powder activation coating using an aqueous erucamide emulsion, which differs from Example 1 in that no anti-settling stabilizer is added.

[0051] Comparative Example 2: A powder activation coating using an aqueous erucamide emulsion, which differs from Example 1 in that hydroxyethyl cellulose is used as an anti-settling agent.

[0052] Comparative Example 3: A powder activation coating using an aqueous erucamide emulsion, which differs from Example 1 in that the anti-settling agent is polyethylene glycol 600.

[0053] Comparative Example 4: A powder activation coating using an aqueous erucamide emulsion, which differs from Example 1 in that the amount of erucamide used is 50 g, the amount of deionized water used is 50 g, and the amounts of other raw materials remain unchanged.

[0054] Comparative Example 5: An aqueous erucamide emulsion, comprising the following components in parts by weight: 60 parts of deionized water, 40 parts of erucamide, 3 parts of dispersant, 3 parts of emulsifier, 0.5 parts of solubilizer, 3 parts of aqueous antifoaming agent and 0.3 parts of anti-settling agent; the dispersant is polyoxyethylene ether, the emulsifier is sodium dodecylbenzene sulfonate, the solubilizing agent is alkyl betaine, the aqueous antifoaming agent is polyether modified polydimethylsiloxane, and the anti-settling agent is hydroxyethyl cellulose.

[0055] The preparation method of the aqueous erucamide emulsion comprises the following steps: (1) adding deionized water to a reactor and heating it to 60°C; (2) adding erucamide to the reactor and stirring continuously until the temperature reaches 80°C, and keeping the temperature for 60 minutes until the erucamide is completely melted; (3) adding a dispersant, an emulsifier, a solubilizing agent and an anti-settling agent and stirring continuously, maintaining the temperature at 80°C for 60 minutes; (4) adding an aqueous antifoaming agent and stirring continuously, maintaining the temperature of the emulsion system at 80°C for 20 minutes; (5) after the insulation of step (4) is completed, cooling the emulsion to below 20°C, and then grinding to make the particle size of the erucamide reach 0.1-1 μm, stopping the grinding, and obtaining the aqueous erucamide emulsion; in the above steps, the reaction pressure in the reactor is maintained at 2 kg / cm 2 .

[0056] Performance testing 1. Dispersibility test of aqueous erucamide emulsion: Aqueous erucamide was prepared according to the methods in the examples and comparative examples, and performance tests were performed according to the following methods. The test results are recorded in Table 2.

[0057] Dispersion stability: Pour 5 ml of aqueous erucamide emulsion into a graduated test tube and let it stand, then seal the test tube. Read the volume V of the supernatant in the test tube at 6, 12, 18, 24 and 30 days, respectively. The volume of the sedimentation part is (5-V) mL, then the dispersion stability = (5-V) / 5. The larger the value, the better the dispersion stability of the aqueous erucamide emulsion.

[0058] Table 2 Dispersion performance test of aqueous erucamide emulsion As can be seen from the data in Table 2, the anti-settling agents prepared in Preparation Examples 1 and 2 in Examples 1-3, and an appropriate amount of anti-settling stabilizer, dispersant, emulsifier, etc., are used to prepare the aqueous erucic acid amide emulsion. After being placed at room temperature for 30 days, its dispersion stability is above 0.85, indicating that the aqueous erucic acid amide emulsion prepared in the present application still has good dispersibility after being placed at room temperature for 30 days, and is not prone to precipitation and stratification.

[0059] In Example 4, the anti-settling agent prepared in Preparation Example 3 is used. Compared with Preparation Example 1, polyethylene glycol 6000 is used as one of the raw materials of the anti-settling agent. It can be seen that the dispersion stability of the prepared aqueous erucamide emulsion decreases with the extension of storage time.

[0060] The anti-settling agents in Examples 5 and 6 are prepared from Preparation Example 4 and Preparation Example 5, respectively. Compared with Preparation Example 1, carboxylate is also used to modify silicon dioxide. From the comparison of the data in Table 2, it can be seen that the dispersion stability of the aqueous erucamide emulsions prepared in Examples 5 and 6 is increased. After being placed at room temperature for 30 days, the dispersion stability still reaches 0.89-0.9.

[0061] Compared with Example 6, Examples 7 and 8 further subjected the organic bentonite used as an anti-settling agent stabilizer to a series of pretreatments. Table 2 shows that the dispersion stability of the aqueous erucamide emulsions prepared in Examples 7 and 8 reached 0.92 after storage at room temperature.

[0062] Compared with Example 8, Examples 9 and 10 further use polyvinyl pyrrolidone, polypropylene suanan and polyethylene oxide in a specific dosage ratio as solubilizers. The anti-dispersion, anti-agglomeration and anti-precipitation effects of the aqueous erucamide emulsions prepared in Examples 9 and 10 are further improved.

[0063] In Example 11, polyvinyl pyrrolidone was used alone as a solubilizer. Compared with Example 8, the dispersion stability was slightly reduced. In Examples 12-14, the raw materials in the solubilizer were changed respectively, and it can be seen that the dispersion stability of the prepared aqueous erucamide emulsion was affected to a certain extent.

[0064] Compared with Example 1, no anti-precipitation agent stabilizer was added in Comparative Example 1, and the anti-precipitation and anti-stratification capabilities of the aqueous erucamide solution prepared in Comparative Example 1 were reduced.

[0065] In Comparative Example 2, hydroxyethyl cellulose was used as an anti-settling agent. Compared with Example 1, the dispersion performance of the aqueous erucamide emulsion prepared in Comparative Example 2 was reduced, and stratification and precipitation gradually occurred as the storage time increased.

[0066] In Comparative Example 3, the anti-settling agent is only polyethylene glycol 600, and nano silicon dioxide is not used. As shown in Table 2, the dispersion stability of the aqueous erucamide emulsion prepared therefrom is reduced.

[0067] In Comparative Example 4, the amount of erucamide was increased, and it can be seen that the viscosity of the aqueous erucamide emulsion increased, but its dispersibility was weakened.

[0068] Comparative Example 5 is an aqueous erucamide emulsion provided in the prior art. After being stored at room temperature for 30 days, its dispersibility decreases and stratification and agglomeration are prone to occur.

[0069] 2. Performance test of water-based erucamide emulsion The aqueous erucic acid amide emulsion prepared in the embodiment and the comparative example was used to prepare plastic film products, respectively. The use method was as follows: the aqueous erucic acid amide emulsion was mixed with 16g powder particles (calcium carbonate, with an average particle size of 200nm) in a mass ratio of 1:3.2, stirred for 30min, and then mixed evenly with 53g HDPE and 16g LLDPE. After mixing, the mixture was extruded, cast, and stretched to obtain a plastic film with a thickness of 40μm. The temperatures of the conveying section, melting section, mixing section, exhaust section, and homogenizing section of the extruder were 200°C, 220°C, 240°C, 240°C, and 220°C, respectively. The speed of the screw was 550r / min, the stretch ratio was 1.8:1, and the density of LLDPE was 0.918g / cm 3 , melt index is 2g / 10min, selected from Kuwait, brand is EFDC-7050, HDPE density is 0.961g / cm 3 , melt index is 46g / 10min, selected from Saudi Exxon, model HYA800. The transmittance, tensile strength and friction coefficient were tested according to the following method, and then under 365nm ultraviolet light, at 18.52W / m 2 After irradiation for 100 h, the transmittance and tensile strength were tested again, and the test results were recorded in Table 3.

[0070] 1. Transmittance: The transparency of the sample was tested using an ultraviolet-visible spectrophotometer (UV2600i, SHIMADZU, Japan) with a wavelength range of 800 nm.

[0071] 2. Tensile strength: Test in accordance with GB / T 1040.3-2006 "Determination of tensile properties of plastics Part 3: Test conditions for films and sheets".

[0072] 3. Dynamic friction coefficient: Test in accordance with GB / T10006-1988 "Determination of friction coefficient of plastic films and sheets".

[0073] Table 3 Performance test of water-based erucamide emulsion From the comparison of the data in Table 3, it can be seen that the aqueous erucic acid amide emulsion prepared in Examples 1-3 is used for activation and encapsulation of powder particles, which can make the powder particles evenly dispersed in the polymer material matrix, improve the light transmittance and mechanical properties of plastic products, and increase smoothness. However, it cannot resist aging due to ultraviolet rays and is prone to aging, discoloration, etc.

[0074] In Example 4, polyethylene glycol 6000 was used instead of polyethylene glycol 600. Compared with Example 1, the transparency and mechanical strength of the plastic film itself were affected, indicating that the dispersion effect of the aqueous erucamide emulsion on the powder particles was weakened.

[0075] In Example 5 and Example 6, the anti-settling agents prepared in Preparation Example 4 and Preparation Example 5 are used. It can be seen that the transparency of the plastic films prepared in Example 5 and Example 6 is increased, the tensile strength is increased, the surface dynamic friction coefficient is increased, and the smoothness and density are increased, but the UV resistance is not much different from that in Example 1.

[0076] Compared with Example 6, Example 7 and Example 8 further pre-treated the organic bentonite, and it can be seen that the transparency and tensile strength thereof are enhanced, and after being irradiated with ultraviolet rays, the decrease in transparency and tensile strength is reduced, and the anti-ultraviolet ability is enhanced.

[0077] Compared with Example 8, Examples 9 and 10 use polyvinyl pyrrolidone, sodium polyacrylate and polyethylene oxide as solubilizers. It can be seen that the transparency and tensile strength of the prepared plastic films are enhanced, indicating that the powder particle distribution is more uniform and the surface smoothness is better. In addition, after ultraviolet irradiation, the transparency decreases less, the tensile strength retention rate is large, and it has stronger resistance to ultraviolet aging and discoloration.

[0078] In Example 11, polyvinyl pyrrolidone is used as a solubilizer. Compared with Example 10, the transparency and tensile strength of the plastic film prepared therefrom are weakened, and the ultraviolet resistance is reduced.

[0079] Compared with Example 10, Examples 12-14 do not add polyethylene oxide, sodium polyacrylate and polyvinyl pyrrolidone. As can be seen from the data in Table 3, the transparency of the plastic films prepared in Examples 12-14 is reduced, and after ultraviolet irradiation, the degree of aging and discoloration is more serious than that in Example 10.

[0080] No anti-settling agent was added in Comparative Example 1, so it can be seen that its transparency is small, the tensile strength is low, and the anti-ultraviolet ability is similar to that of Example 1; hydroxyethyl cellulose is used as an anti-settling agent in Comparative Example 2, and the anti-settling agent in Comparative Example 3 is polyethylene glycol 600. The transparency and tensile strength of the plastic films prepared in Comparative Examples 2 and 3 are not as good as those in Example 1; more erucamide is used in Comparative Example 4, but its effect is not enhanced. Comparative Example 5 uses a commercially available erucamide emulsion, and it can be seen that although it can obtain higher transparency and tensile strength, its resistance to ultraviolet discoloration and ultraviolet aging is poor.

[0081] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A water-based erucamide emulsion for powder activation coating, characterized in that: The invention comprises the following raw materials in parts by weight: 30-40 parts of erucamide, 60-70 parts of deionized water, 4-8 parts of dispersant, 1-2 parts of solubilizer, 1-3 parts of emulsifier, 1.5-3.5 parts of defoamer, 1-1.5 parts of anti-settling agent, and 0.3-0.9 parts of anti-settling stabilizer; The anti-settling agent comprises polyethylene glycol and nano silicon dioxide in a mass ratio of 0.2-0.4:

1.

2. The aqueous erucamide emulsion for powder activation coating according to claim 1, characterized in that: The preparation method of the anti-settling agent is as follows: Nano silicon dioxide is dispersed in deionized water to form a suspension with a concentration of 2-2.5wt%, the pH is adjusted to 2-2.5, ultrasonicated for 5-10 minutes, carboxylate is added, polyethylene glycol is added after stirring and dispersing for 20-30 minutes, and the mixture is mixed and stirred to obtain an anti-settling agent, wherein the mass ratio of carboxylate to nano silicon dioxide is 0.01-0.02:

1.

3. The aqueous erucamide emulsion for powder activation coating according to claim 2, characterized in that: The carboxylate is selected from at least one of sodium acetate, sodium benzoate, sodium formate and sodium ethoxide.

4. The aqueous erucamide emulsion for powder activation coating according to claim 1, characterized in that: The anti-settling stabilizer is at least one of organic bentonite, polyamide wax, polyethylene wax and montmorillonite.

5. The aqueous erucamide emulsion for powder activation coating according to claim 4, characterized in that: The organobentonite is pretreated as follows: Ultrasonic dispersion of organic bentonite in acid solution for 1-2 hours, boiling for 90-100 minutes, cooling, washing to neutrality, and suction filtering to obtain acidified organic bentonite; Disperse the acidified organic bentonite in deionized water, stir evenly to form a suspension with a concentration of 1.5-2wt%, add aluminum sulfate solution, adjust the pH to 5-6, let stand for 2-4 hours, wash, filter, dry at 105-110°C for 2-4 hours, and then roast at 300-320°C for 4-6 hours.

6. The aqueous erucamide emulsion for powder activation coating according to claim 1, characterized in that: The solubilizing agent comprises polyvinyl pyrrolidone, sodium polyacrylate and polyethylene oxide in a mass ratio of 1:0.02-0.1:0.1-0.

2.

7. The aqueous erucamide emulsion for powder activation coating according to claim 1, characterized in that: The dispersant is selected from at least one of polyoxyethylene ether, phosphate and hydroxyethyl cellulose.

8. The aqueous erucamide emulsion for powder activation coating according to claim 1, characterized in that: The emulsifier is selected from at least one of erythritol, oligosaccharides, paraffin, stearate and sodium dodecylbenzene sulfonate.

9. The aqueous erucamide emulsion for powder activation coating according to claim 1, characterized in that: The defoaming agent is selected from polyether-modified polydimethylsiloxane or polyoxyethylene polyoxypropanolamine ether.

10. The method for preparing the aqueous erucic acid amide emulsion for powder activation coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: Mix the dispersant, solubilizer and emulsifier with deionized water, and stir for 10-20 minutes at 30-35°C to obtain a stable solution; Adding erucic acid amide to the stable solution, stirring at 80-100° C. for 10-20 min to obtain a suspension; Adding an anti-settling agent, an anti-settling stabilizer and a defoaming agent to the suspension, stirring at 30-35° C. for 10-20 min, and then grinding for 6-7 h to obtain a mixed solution; The mixed solution is ultrasonically dispersed at 35-40° C. for 10-20 minutes to obtain an aqueous erucamide emulsion.

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