Water-based erucamide emulsion for powder activation and coating and preparation method thereof

Abstract

The application relates to the field of lubricants, and particularly discloses a water-based erucic amide emulsion for powder activation coating and a preparation method thereof. The water-based erucic amide emulsion for powder activation coating is characterized by comprising the following raw materials in parts by weight: 30-40 parts of erucic 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 emulsifier, 1.5-3.5 parts of an antifoaming agent, 1-1.5 parts of an anti-settling agent, and 0.3-0.9 parts of an anti-settling stabilizer; the anti-settling agent comprises polyethylene glycol and nano silicon dioxide at a mass ratio of 0.2-0.4:1. The water-based erucic amide emulsion can be used for coating and activating powder particles, and can increase the dispersibility of the powder particles in plastic products; the water-based erucic amide emulsion has good dispersibility, is not prone to stratification and precipitation, and can be used to prepare plastic products with good transparency, smooth surface, strong anti-ultraviolet discoloration and aging resistance.

Description

TECHNICAL FIELD

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

[0002] Plastic raw materials can only be made into plastic products through processing, and the most commonly used method is molding (thermoplastic) under high temperature conditions, such as extrusion, injection molding, calendering, casting, blow molding, suction molding and thermoforming. Plastic materials have the advantages of light weight, high strength, excellent electrical performance, easy processing and molding, bright appearance and color, etc. In order to increase the hardness and strength of the plastic products, reduce the cost and improve the dimensional stability, an appropriate amount of powder such as calcium carbonate and talc powder is usually added to the plastic products. In order to increase the dispersion uniformity of the powder in the plastic base material and reduce the influence of the powder on the transparency of the plastic product, a lubricant is usually added to the plastic product. The lubricant can increase the dispersion of the powder, reduce the agglomeration of the powder, significantly reduce the friction coefficient of the plastic product, improve the transparency and gloss, increase the antistatic effect and reduce the accumulation of dust. The commonly used lubricant is erucamide, which has a high melting point and good thermal stability.

[0003] In the preparation of plastic products, the raw materials such as plastic base material, powder, lubricant and other additives are usually mixed and then hot-melted. In this process, the erucamide may have been hot-melted, but it may not have been uniformly mixed with the powder. Therefore, the erucamide may not be able to fully cover the powder particles during melting, which may reduce the coating and lubricating effect of the powder particles, and further affect the dispersion of the powder particles in the plastic product, thereby affecting the transparency and friction coefficient of the plastic product. In view of the above-mentioned related technology, the inventors found that the erucamide is usually made into an erucamide emulsion as a lubricant, but the erucamide has a large particle size, is not easy to disperse, is prone to precipitation, and may appear to be flocculated and layered after a long period of storage. SUMMARY

[0004] In order to improve the anti-layering and anti-settling effects of the water-based erucamide emulsion, the present application provides a water-based erucamide emulsion for powder activation and coating and a preparation method thereof.

[0005] In a first aspect, the present application provides a water-based erucamide emulsion for powder activation and coating, which adopts the following technical solution:

[0006] A water-based erucamide emulsion for powder activation and coating includes the following raw materials by weight: 30-40 parts of erucamide, 60-70 parts of deionized water, 4-8 parts of a dispersing agent, 1-2 parts of a solubilizing agent, 1-3 parts of an emulsifier, 1.5-3.5 parts of an antifoaming agent, 1-1.5 parts of an anti-settling agent and 0.3-0.9 parts of an anti-settling stabilizer.

[0007] The anti-settling agent comprises polyethylene glycol and nano-silica in a mass ratio of 0.2-0.4:1.

[0008] By adopting the technical scheme, the long carbon chain in the erucamide molecule enables the erucamide molecule to form an ordered molecular film, the ordered molecular film can be adsorbed on the surface of the powder particles to form a lubricating film, thereby significantly reducing the adhesion between the powder particles, improving the flowability and dispersibility of the powder, reducing the friction coefficient and wear.

[0009] The dispersant, emulsifier, solubilizer, anti-settling agent and the like are used to disperse and dissolve the erucamide, the emulsifier can be adsorbed on the interface between the erucamide and the deionized water to reduce the interfacial tension and promote the effective dispersion of the erucamide in the deionized water, thereby forming a stable emulsion, the dispersant helps to further refine the erucamide particles and prevent the agglomeration of the erucamide particles in the water, the dispersant is adsorbed on the surface of the erucamide particles to form a protective layer, thereby preventing the interaction between the erucamide particles and maintaining the stability of the emulsion, the solubilizer can increase the solubility of the erucamide in water, so that the erucamide is more easily dispersed in the deionized water, and the polarity of the water is changed to make the erucamide molecules more easily interact with the water molecules, the nano-silica and polyethylene glycol are used as the anti-settling agent, the polyethylene glycol is a colorless and transparent liquid produced through oxidation and polymerization reaction, has good solubility and compatibility, can be completely dissolved in the deionized water, has high viscosity and adhesion, can effectively increase the viscosity of the erucamide emulsion and slow down the sedimentation speed of the erucamide in the emulsion, thereby improving the dispersion effect and the stability of the emulsion, the silica is white carbon black, has excellent thickening, leveling and anti-settling properties, the mixture of the silica and the polyethylene glycol as the anti-settling agent, the molecular chain of the polyethylene glycol has a special structure and hydrophilicity, can form a hydrogen bond with the surface of the silica, thereby improving the dispersibility of the silica and reducing the possibility of agglomeration, and the improvement of the dispersibility helps to prevent the sedimentation of the erucamide, and the silica and the polyethylene glycol can form a chain-like three-dimensional network structure through the hydrogen bond, and the bridge effect of the hydrogen bond and the ionic bond force of the nano-silica exist in dynamic balance in the absence of external force, thereby constructing a network system, increasing the suspension of the erucamide in the emulsion and reducing the possibility of stratification and sedimentation.

[0010] Optionally, the anti-settling agent is prepared as follows:

[0011] The nano-silica is dispersed into deionized water to form a suspension with a concentration of 2-2.5 wt%, the pH is adjusted to 2-2.5, ultrasonic treatment is performed for 5-10 min, the carboxylate is added, stirring and dispersion are performed for 20-30 min, then the polyethylene glycol is added, and mixing and stirring are uniformly performed to obtain the anti-settling agent, the mass ratio of the carboxylate to the nano-silica is 0.01-0.02:1.

[0012] By using the above technical solution, the carboxylate is used to modify the silica, the carboxylate groups are grafted to the surface of the silica, the surface properties are changed, the silica has certain hydrophilicity and lipophilicity, the surface has certain electric charge or functional groups, the compatibility with the polyethylene glycol is improved, the grafted carboxylate groups on the surface of the modified silica can form certain steric hindrance, the agglomeration between the silica particles is prevented, the dispersibility of the silica in the polyethylene glycol is improved, and better anti-settling effect of the erucic amide particles is achieved; when the silica is in the acidic solution, the hydrogen ions increase, and are combined with the negative electric charge on the surface of the silica, so that the surface of the silica has positive electric charge, the adsorption of the carboxylate on the surface of the nano-silica is single-layer adsorption, the long-chain ions of the carboxylic acid with negative electric property are adsorbed on the surface of the silica with positive electric charge due to electrostatic attraction, the hydrophilic end of the long-chain is firmly combined with the surface of the polar particles, the lipophilic end of the long-chain generates sufficient steric hindrance in the aqueous dispersion system to achieve the stabilizing effect, in addition, the carboxylate contains carboxyl groups which can react with the hydroxyl groups on the surface of the silica, chemical adsorption is formed, the adsorption is relatively firm, and the electrostatic repulsion exists on the surface of the silica, so that the silica particles have good dispersibility and are more stable, a more stable three-dimensional network structure is constructed with the polyethylene glycol, and the suspension and dispersion effect of the erucic amide is improved.

[0013] Optionally, the carboxylate is at least one of sodium acetate, sodium benzoate, sodium formate and sodium ethoxide.

[0014] Optionally, the anti-settling stabilizer is at least one of organic bentonite, polyamide wax, polyethylene wax and montmorillonite.

[0015] By using the above technical solution, the anti-settling stabilizer can prevent the erucic amide particles from settling or agglomerating in the deionized water, the organic bentonite, the polyamide wax and the like are nearly transparent substances, have excellent thixotropy and thickening property, can form a stable gel structure, the particles are easily dispersed when subjected to shear force, and remain in a stable state when static, a lubricating film or protective film is formed on the surface of the erucic amide particles to prevent direct contact and distance between the particles and change the electric property of the particle surface, so that the particles produce electrostatic repulsion, the dispersion state of the particles is maintained, and the particles are prevented from settling.

[0016] Optionally, the organic bentonite is subjected to the following pretreatment:

[0017] The organic bentonite is dispersed in acid solution under ultrasonic for 1-2h, boiled for 90-100min, cooled, washed to neutral, and filtered to obtain acidified organic bentonite;

[0018] The acidified organic bentonite is dispersed in deionized water, stirred to form a suspension with a concentration of 1.5-2wt%, then aluminum sulfate solution is added to adjust the pH to 5-6, and the mixture is left to stand for 2-4h, washed, filtered, dried at 105-110℃ for 2-4h, and then calcined at 300-320℃ for 4-6h.

[0019] By using the above technical solution, the organic bentonite is a hydrophobic substance and cannot be fully immersed in aqueous solution, and contains some impurities. After acid treatment, the surface impurities are removed, and part of the impurities are converted into hydroxyl or carboxyl groups, greatly enhancing the hydrophilicity of the organic bentonite and improving its dispersibility in water. Aluminum sulfate hydrolyzes under acidic conditions and precipitates as aluminum hydroxide on the surface of the organic bentonite, forming a starry river aluminum hydroxide coating. After calcination, the aluminum hydroxide is dehydrated to form aluminum oxide, and finally the organic bentonite coated with aluminum oxide is obtained. The aluminum oxide coating can improve the anti-ultraviolet effect of the organic bentonite and prevent the penetration of ultraviolet light. Therefore, after the water-based erucic acid amide emulsion coated powder particles, the plastic products can improve the anti-aging and discoloration ability of the plastic products.

[0020] Optionally, the solubilizing agent includes polyvinylpyrrolidone, sodium polyacrylate, and polyethylene oxide in a mass ratio of 1:0.02-0.1:0.1-0.2.

[0021] By adopting the above technical scheme, polyvinylpyrrolidone is a non-ionic high molecular polymer, has excellent water solubility and film forming property, can be combined with erucamide through intermolecular interaction to form a stable dispersion system, and polyvinylpyrrolidone has excellent ultraviolet absorption performance, the conjugated structure in the molecule enables it to effectively absorb ultraviolet light and convert it into heat energy, thereby preventing the harmful effects of ultraviolet light on the product, increasing the ability of the plastic product to resist ultraviolet light, and causing the plastic product to oxidize and discolor; sodium polyacrylate is a cationic high molecular polymer, has strong hydrophilicity and good dispersibility, can be combined with erucamide molecules through charge interaction to form a stable emulsion, and the molecular structure of sodium polyacrylate can absorb or scatter ultraviolet light, is uniformly distributed in the plastic product, can form a protective film, effectively blocks the direct irradiation of ultraviolet light, thereby reducing the penetration and damage of ultraviolet light to the plastic film, prevents the plastic product from yellowing or aging, and prolongs the service life; polyethylene oxide is a high molecular polymer, has good water solubility and hydrophilicity due to the large number of ether bonds in the molecular chain, and the ether bonds can form hydrogen bonds with certain functional groups (such as amide groups) in the erucamide molecules, which can enhance the interaction between the erucamide molecules and the 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 to form a protective layer around the erucamide molecules, prevent the agglomeration and precipitation of the erucamide molecules through steric hindrance effect, help to stabilize the dispersion system, and polyethylene oxide can exhibit properties similar to surfactants, can form micelles or microemulsion structures in aqueous solution to provide a good dispersion environment for erucamide molecules, reduce the interaction force between erucamide molecules, make it easier to disperse in water, and reduce agglomeration and sedimentation; polyethylene oxide can form a protective layer with erucamide on the surface of the powder particles to block or absorb part of the ultraviolet light, slow down the erosion of ultraviolet light on the plastic product, and enhance the resistance of the plastic product to ultraviolet light; therefore, the use of the three components as a solubilizing agent can effectively enhance the dispersibility of erucamide, enhance the anti-ultraviolet effect of erucamide, and enhance the auxiliary anti-ultraviolet ability of erucamide in plastic products, reduce the aging and discoloration of plastic products caused by ultraviolet light.

[0022] Optionally, the dispersant is selected from at least one of polyoxyethylene ether, phosphate, hydroxyethyl cellulose.

[0023] By adopting the above technical scheme, polyoxyethylene ether and the like are used as the dispersant of erucamide, which can effectively disperse erucamide particles and prevent particle agglomeration and precipitation, thereby achieving uniform dispersion.

[0024] Optionally, the emulsifier is selected from at least one of erythritol, oligosaccharide, paraffin, stearate, and sodium dodecylbenzenesulfonate.

[0025] By adopting the technical scheme, the various raw materials above are used as emulsifiers, which can increase the stability of the emulsion, improve the flowability and dispersibility of the emulsion, improve the lubricating effect of the emulsion, and prevent the agglomeration and precipitation of particles.

[0026] Optionally, the defoaming agent is selected from polyether-modified polydimethylsiloxane or polyoxyethylene polyoxypropanol amine ether.

[0027] By adopting the technical scheme, the polyether-modified polydimethylsiloxane has ultra-low surface tension, strong wetting and permeability, and persistent defoaming effect. The polyoxyethylene polyoxypropanol amine ether is a high molecular compound formed by connecting polyoxyethylene (POE) and polyoxypropylene (POP) two segments through an amide bond, has unique water solubility and surface activity, can maintain good solubility in the water phase, and can play a high-efficiency emulsifying, dispersing and stabilizing role at the interface of the oil phase or the solid phase. The POE segment has strong hydrophilicity and can form a hydrogen bond with water molecules, so that the molecules are easy to disperse in water. The POP segment shows certain hydrophobicity and can be adsorbed on the foam surface to reduce the stability of the foam.

[0028] In a second aspect, the application provides a preparation method of a water-based erucamide emulsion for powder activation coating, which adopts the following technical scheme:

[0029] A preparation method of a water-based erucamide emulsion for powder activation coating, comprising the following steps:

[0030] The dispersant, the solubilizer, the emulsifier and the deionized water are mixed, and stirred at 30-35°C for 10-20 min to obtain a stable solution. The erucamide is added to the stable solution, and stirred at 80-100°C for 10-20 min to obtain a suspension.

[0031] The anti-settling agent, the anti-settling stabilizer and the defoaming agent are added to the suspension, and stirred at 30-35°C for 10-20 min, and then ground for 6-7 h to obtain a mixed liquid.

[0032] The mixed liquid is subjected to ultrasonic dispersion at 35-40°C for 10-20 min to prepare the water-based erucamide emulsion.

[0033] By adopting the technical scheme, the dispersant, the solubilizer and the emulsifier, the deionized water are first mixed, and then mixed with the erucamide. After being mixed with the defoaming agent and the like and being ground, the particle size of the erucamide is reduced to microns or even nanometers. Then, the erucamide is uniformly dispersed by ultrasonic treatment, so that the emulsion system has excellent stability.

[0034] In summary, the application has the following beneficial effects:

[0035] 1. The application uses a mixture of polyethylene glycol and nano-silicon dioxide as an anti-settling agent, hydrogen bonds are formed between the two, forming a three-dimensional network structure, thereby improving the suspension stability of the erucamide particles, reducing the stratification and precipitation of erucamide, improving the dispersibility of erucamide, and allowing the emulsion to be stored for a long time without appearing to be flocculated and stratified.

[0036] 2. In the application, organic bentonite and polyamide wax are preferably used as a sedimentation stabilizer to improve the dispersion stability of erucamide. In addition, aluminum sulfate is used to coat the organic bentonite, and after sintering, alumina-coated organic bentonite is obtained, which can enhance the ultraviolet aging resistance of the organic bentonite. The erucamide emulsion-coated powder particles can effectively improve the ultraviolet yellowing resistance of plastic products and reduce the impact of ultraviolet radiation on the transparency and mechanical properties of plastic products.

[0037] 3. In the application, polyvinylpyrrolidone, sodium polyacrylate, and polyethylene oxide are preferably used as solubilizers, which can further increase the dispersibility of erucamide, improve the lubricity and coating effect of erucamide emulsion, and improve the ultraviolet and anti-aging effect of erucamide. DETAILED DESCRIPTION

[0038] The following examples further illustrate the application.

[0039] Preparation Examples 1-5 of Anti-settling Agent

[0040] Preparation Example 1: 25g of nano-silicon dioxide was dispersed in deionized water to form a suspension with a concentration of 2.5wt%, the pH was adjusted to 2.5, and ultrasonic treatment was performed at a power of 200W for 10min. Polyethylene glycol was added and mixed and stirred uniformly at a speed of 1000r / min to obtain the anti-settling agent. The mass ratio of nano-silicon dioxide to polyethylene glycol was 1:0.4, and the polyethylene glycol was polyethylene glycol 600.

[0041] Preparation Example 2: 20g of nano-silicon dioxide was dispersed in deionized water to form a suspension with a concentration of 2wt%, the pH was adjusted to 2, and ultrasonic treatment was performed at a power of 300W for 5min. Polyethylene glycol was added and mixed and stirred uniformly at a speed of 1000r / min to obtain the anti-settling agent. The mass ratio of nano-silicon dioxide to polyethylene glycol was 1:0.2, and the polyethylene glycol was polyethylene glycol 600.

[0042] Preparation Example 3: The difference from Preparation Example 1 is that the polyethylene glycol is polyethylene glycol 6000.

[0043] Preparation Example 4: 20 g of nano-silica was dispersed in deionized water to form a suspension with a concentration of 2 wt%, the pH was adjusted to 2, and ultrasonic treatment was performed at a power of 300 W for 5 min. Carboxylate was added, and the dispersion was stirred at a speed of 1000 r / min for 20 min. Then, polyethylene glycol was added, and the mixture was stirred uniformly to obtain a sedimentation inhibitor. The mass ratio of nano-silica, polyethylene glycol, and carboxylate was 1:0.2:0.01. The carboxylate was sodium acetate, and the polyethylene glycol was polyethylene glycol 600.

[0044] Preparation Example 5: 25 g of nano-silica was dispersed in deionized water to form a suspension with a concentration of 2.5 wt%, the pH was adjusted to 2.5, and ultrasonic treatment was performed at a power of 200 W for 10 min. Carboxylate was added, and the dispersion was stirred at a speed of 1000 r / min for 30 min. Then, polyethylene glycol was added, and the mixture was stirred uniformly to obtain a sedimentation inhibitor. The mass ratio of nano-silica, polyethylene glycol, and carboxylate was 1:0.4:0.02. The carboxylate was sodium acetate, and the polyethylene glycol was polyethylene glycol 600.

[0045] Example

[0046] Example 1: A water-based erucic acid amide emulsion for powder activation and coating, the amounts of raw materials are shown in Table 1. The dispersant is polyoxyethylene ether, which is selected from Jiangsu Haian Petrochemical Co., Ltd., and the model is MOA-9. The solubilizer is dodecyl betaine, which is selected from Green Sun, and the model is BS-12. The emulsifier is erythritol. The antifoaming agent is polyether modified polydimethylsiloxane, which is selected from Hubei Bolangwan Bioengineering Co., Ltd., and the model is lbw. The sedimentation inhibitor is prepared according to Preparation Example 1. The anti-settling stabilizer is organic bentonite.

[0047] The preparation method of the water-based erucic acid amide emulsion for powder activation and coating includes the following steps:

[0048] S1, the dispersant, the solubilizer, the emulsifier, and deionized water are mixed, and stirred at a speed of 1000 r / min at 30°C for 20 min to obtain a stable solution;

[0049] S2, erucic acid amide is added to the stable solution, and stirred at a speed of 800 r / min at 100°C for 20 min to obtain a suspension;

[0050] S3, the sedimentation inhibitor, the anti-settling stabilizer, and the antifoaming agent are added to the suspension, and stirred at 30°C for 20 min, and then ground for 7 h to obtain a mixture;

[0051] S4, the mixture is subjected to ultrasonic dispersion at a frequency of 40 kHz at 35°C for 20 min to obtain a water-based erucic acid amide emulsion.

[0052] Table 1: Amounts of raw materials for water-based erucic acid amide emulsion in Examples 1-3

[0053]

[0054]

[0055] Example 2: A powder activation coating aqueous erucamide emulsion, the raw material usage is shown in Table 1, wherein the dispersant is hydroxyethyl cellulose, the solubilizer is dodecyl betaine, which is selected from Green Forest, and the model is BS-12, the emulsifier is sodium dodecyl benzene sulfonate, the antifoaming agent is polyoxyethylene polyoxypropyl alcohol amine ether, the anti-settling agent is made by Preparation Example 2, and the anti-settling stabilizer is polyamide wax, which is selected from Foshan Shangzhou New Material, and the model is LY-6300.

[0056] The preparation method of the above-mentioned powder activation coating aqueous erucamide emulsion comprises the following steps:

[0057] S1, mixing the dispersant, the solubilizer, the emulsifier and deionized water, stirring at 1000 r / min at 35°C for 10 min to obtain a stable solution;

[0058] S2, adding erucamide to the stable solution, stirring at 1000 r / min at 80°C for 10 min to obtain a suspension;

[0059] S3, adding the anti-settling agent, the anti-settling stabilizer and the antifoaming agent to the suspension, stirring at 35°C for 10 min, and then grinding for 6 h to obtain a mixed liquid;

[0060] S4, ultrasonic dispersion of the mixed liquid at 40 kHz at 40°C for 10 min to prepare the aqueous erucamide emulsion.

[0061] Example 3: A powder activation coating aqueous erucamide emulsion, which is different from Example 1 in that the raw material usage is shown in Table 1.

[0062] Example 4: A powder activation coating aqueous erucamide emulsion, which is different from Example 1 in that the anti-settling agent is made by Preparation Example 3.

[0063] Example 5: A powder activation coating aqueous erucamide emulsion, which is different from Example 1 in that the anti-settling agent is made by Preparation Example 4.

[0064] Example 6: A powder activation coating aqueous erucamide emulsion, which is different from Example 1 in that the anti-settling agent is made by Preparation Example 5.

[0065] Example 7: A powder activation coating aqueous erucamide emulsion, which is different from Example 6 in that the organic bentonite is pretreated as follows:

[0066] 2g organic bentonite was dispersed in acid solution with 200W power ultrasonic for 2h, boiled for 100min, cooled, washed to neutral, filtered, to obtain acidified organic bentonite, the acid solution was prepared by mixing 50ml of concentrated nitric acid with a concentration of 63% and 100ml of distilled water; the acidified organic bentonite was dispersed in deionized water, stirred uniformly to form a suspension with a concentration of 2wt%, then an aluminum sulfate solution with a concentration of 60wt% was added, the pH was adjusted to 6, and the mixture was left to stand for 4h, washed, filtered, dried at 105℃ for 4h, and then calcined at 300℃ for 6h, the mass ratio of acidified organic bentonite to aluminum sulfate was 1:1.

[0067] Example 8: A water-based erucic acid amide emulsion for powder activation and coating, which is different from example 6 in that the organic bentonite is pretreated as follows:

[0068] 2g organic bentonite was dispersed in acid solution with 200W power ultrasonic for 1h, boiled for 90min, cooled, washed to neutral, filtered, to obtain acidified organic bentonite, the acid solution was prepared by mixing 50ml of concentrated nitric acid with a concentration of 63% and 100ml of distilled water; the acidified organic bentonite was dispersed in deionized water, stirred uniformly to form a suspension with a concentration of 1.5wt%, then an aluminum sulfate solution with a concentration of 60wt% was added, the pH was adjusted to 5, and the mixture was left to stand for 2h, washed, filtered, dried at 110℃ for 3h, and then calcined at 320℃ for 4h, the mass ratio of acidified organic bentonite to aluminum sulfate was 1:1.

[0069] Example 9: A water-based erucic acid amide emulsion for powder activation and coating, which is different from example 8 in that the solubilizing agent includes polyvinylpyrrolidone, sodium polyacrylate and polyethylene oxide with a mass ratio of 1:0.1:0.2, the molecular weight of polyethylene oxide is 50,000, and it is selected from Jining Huakai Resin Co., Ltd. with the product number PEO.

[0070] Example 10: A water-based erucic acid amide emulsion for powder activation and coating, which is different from example 8 in that the solubilizing agent includes polyvinylpyrrolidone, sodium polyacrylate and polyethylene oxide with a mass ratio of 1:0.02:0.1, the molecular weight of polyethylene oxide is 50,000, and it is selected from Jining Huakai Resin Co., Ltd. with the product number PEO.

[0071] Example 11: A water-based erucic acid amide emulsion for powder activation and coating, which is different from example 10 in that the solubilizing agent is polyvinylpyrrolidone.

[0072] Example 12: A water-based erucic acid amide emulsion for powder activation and coating, which is different from example 10 in that the solubilizing agent includes polyvinylpyrrolidone and sodium polyacrylate with a mass ratio of 1:0.1.

[0073] Example 13: A water-based erucamide emulsion for powder activation coating, which is different from example 10 in that the solubilizing agent includes polyvinylpyrrolidone and polyethylene oxide with a mass ratio of 1:0.2, the polyethylene oxide has a molecular weight of 500,000, and is selected from Jining Huakai Resin Co., Ltd. with a product number of PEO.

[0074] Example 14: A water-based erucamide emulsion for powder activation coating, which is different from example 10 in that the solubilizing agent includes sodium polyacrylate and polyethylene oxide with a mass ratio of 0.1:0.2, the polyethylene oxide has a molecular weight of 500,000, and is selected from Jining Huakai Resin Co., Ltd. with a product number of PEO.

[0075] Comparative Example

[0076] Comparative Example 1: A water-based erucamide emulsion for powder activation coating, which is different from example 1 in that no anti-settling stabilizer is added.

[0077] Comparative Example 2: A water-based erucamide emulsion for powder activation coating, which is different from example 1 in that hydroxyethyl cellulose is used as the anti-settling agent.

[0078] Comparative Example 3: A water-based erucamide emulsion for powder activation coating, which is different from example 1 in that the anti-settling agent is polyethylene glycol 600.

[0079] Comparative Example 4: A water-based erucamide emulsion for powder activation coating, which is different from example 1 in that the amount of erucamide is 50 g, the amount of deionized water is 50 g, and the amounts of the remaining raw materials remain unchanged.

[0080] Comparative Example 5: A water-based erucamide emulsion, which includes the following components in parts by weight: 60 parts of deionized water, 40 parts of erucamide, 3 parts of a dispersing agent, 3 parts of an emulsifier, 0.5 parts of a solubilizing agent, 3 parts of a water-based foam inhibitor, and 0.3 parts of an anti-settling agent; the dispersing agent is polyoxyethylene ether, the emulsifier is sodium dodecylbenzenesulfonate, the solubilizing agent is alkyl betaine, the water-based foam inhibitor is polyether-modified polydimethylsiloxane, and the anti-settling agent is hydroxyethyl cellulose.

[0081] The preparation method of the aqueous erucamide emulsion comprises the following steps: (1) adding deionized water into a reaction kettle and heating to 60°C; (2) adding erucamide into the reaction kettle and continuously stirring until the temperature is raised to 80°C, and keeping the temperature for 60 minutes until the erucamide is completely melted; (3) adding a dispersing agent, an emulsifier, a solubilizing agent and an anti-settling agent and continuously stirring, maintaining the temperature at 80°C and keeping the temperature for 60 minutes; (4) adding an aqueous anti-foaming agent and continuously stirring, keeping the temperature of the emulsion system at 80°C and keeping the temperature for 20 minutes; (5) after the temperature keeping in step (4) is completed, the emulsion is cooled to below 20°C, and then is ground to make the particle size of the erucamide reach 0.1-1 μm, and the grinding is stopped to obtain the aqueous erucamide emulsion; in the above steps, the reaction pressure in the reaction kettle is kept at 2 kg / cm 2 .

[0082] Performance detection test

[0083] I. Dispersion detection of the aqueous erucamide emulsion

[0084] The aqueous erucamide is prepared according to the method in the examples and comparative examples, and the performance detection is carried out according to the following method, and the detection results are recorded in Table 2.

[0085] Dispersion stability: 5 ml of the aqueous erucamide emulsion is poured into a graduated test tube, the test tube is sealed, and the volume V of the supernatant is read at 6 days, 12 days, 18 days, 24 days and 30 days, respectively, the volume of the sediment is (5-V) ml, and then the dispersion stability=(5-V) / 5, the larger the value, the better the dispersion stability of the aqueous erucamide emulsion.

[0086] Table 2 Dispersion performance detection of the aqueous erucamide emulsion

[0087]

[0088]

[0089] As can be seen from the data in Table 2, the anti-settling agent prepared from Preparation Example 1 and Preparation Example 2 is used in Examples 1-3, and appropriate amount of anti-settling stabilizer, dispersing agent, emulsifier and the like are used, and the aqueous erucamide emulsion prepared therefrom has a dispersion stability of 0.85 or more after being placed at room temperature for 30 days, which indicates that the aqueous erucamide emulsion prepared in the present application still has good dispersion after being placed at room temperature for 30 days, and is not easy to produce precipitation and stratification.

[0090] In Example 4, the anti-settling agent prepared from Preparation Example 3 is used, and compared with Preparation Example 1, polyethylene glycol 6000 is used as one of the raw materials of the anti-settling agent, and it can be seen that the dispersion stability of the aqueous erucamide emulsion prepared therefrom decreases with the extension of the storage time.

[0091] The anti-settling agent in Example 5 and Example 6 is prepared from Preparation Example 4 and Preparation Example 5 respectively, and compared with Preparation Example 1, the carboxylate is also used to modify the silica, and the data in Table 2 shows that the dispersion stability of the aqueous erucamide emulsion prepared in Example 5 and Example 6 is increased, and the dispersion stability is still 0.89-0.9 after being placed at room temperature for 30 days.

[0092] Example 7 and Example 8 are compared with Example 6, and a series of pretreatments are also performed on the organic bentonite as the anti-settling agent stabilizer, and the data in Table 2 shows that the dispersion stability of the aqueous erucamide emulsion prepared in Example 7 and Example 8 reaches 0.92 after being stored at room temperature.

[0093] Example 9 and Example 10 are compared with Example 8, and polyvinylpyrrolidone, polyacrylsulfonate and polyethylene oxide are also used as the solubilizer in a specific amount ratio, and the anti-dispersion, anti-agglomeration and anti-precipitation effects of the aqueous erucamide emulsion prepared in Example 9 and Example 10 are further improved.

[0094] In Example 11, polyvinylpyrrolidone is used alone as the solubilizer, and compared with Example 8, the dispersion stability is slightly decreased, and in Example 12-14, the raw materials in the solubilizer are changed respectively, and it can be seen that the dispersion stability of the aqueous erucamide emulsion prepared is affected to a certain extent.

[0095] In Comparative Example 1, compared with Example 1, no anti-settling agent stabilizer is added, and the anti-precipitation and anti-layering ability of the aqueous erucamide emulsion prepared in Comparative Example 1 is decreased.

[0096] In Comparative Example 2, hydroxyethyl cellulose is used as the anti-settling agent, and compared with Example 1, the dispersion performance of the aqueous erucamide emulsion prepared in Comparative Example 2 is decreased, and with the extension of the storage time, the layering and precipitation phenomenon gradually appears.

[0097] In Comparative Example 3, the anti-settling agent is only polyethylene glycol 600, and no nano-silica is used, and the data in Table 2 shows that the dispersion stability of the aqueous erucamide emulsion prepared is decreased.

[0098] In Comparative Example 4, the amount of erucamide is increased, and it can be seen that the viscosity of the aqueous erucamide emulsion is increased, but the dispersion is weakened.

[0099] Comparative Example 5 is an aqueous erucamide emulsion provided in the prior art, and after being stored at room temperature for 30 days, the dispersion is decreased, and the layering and agglomeration phenomenon easily appears.

[0100] II. Performance detection of the aqueous erucamide emulsion

[0101] The water-based erucamide emulsions prepared in the examples and comparative examples were respectively used to prepare plastic film products, using the following method: the water-based erucamide emulsion was mixed with 16 g of powder particles (calcium carbonate, average particle size 200 nm) at a mass ratio of 1:3.2, stirred for 30 min, and then mixed uniformly with 53 g of HDPE and 16 g of LLDPE. After mixing, the mixture was extruded, cast, and stretched to obtain a plastic film with a thickness of 40 μm. 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 screw rotation speed was 550 r / min, the stretching ratio was 1.8:1, the density of the LLDPE was 0.918 g / cm 3 , the melt index was 2 g / 10 min, and the LLDPE was selected from Kuwait, with a model number of EFDC-7050. The density of the HDPE was 0.961 g / cm 3 , the melt index was 46 g / 10 min, and the HDPE was selected from Saudi Arabia Exxon, with a model number of HYA800. The light transmittance, tensile strength, and friction coefficient were detected according to the following methods, then the plastic film was irradiated under a 365 nm ultraviolet lamp at 18.52 W / m 2 for 100 h, and the light transmittance and tensile strength were detected again. The detection results are recorded in Table 3.

[0102] 1. Light transmittance: the transparency of the sample was tested using an ultraviolet-visible spectrophotometer (UV2600i, SHIMADZU, Japan), with a wavelength range of 800 nm.

[0103] 2. Tensile strength: the detection was performed according to GB / T 1040.3-2006 “Determination of tensile properties of plastics – Part 3: test conditions for films and sheets”.

[0104] 3. Dynamic friction coefficient: the detection was performed according to GB / T 10006-1988 “Determination of the coefficient of friction of plastics films and sheets”.

[0105] Table 3: Performance detection of water-based erucamide emulsions

[0106]

[0107] As can be seen from the data in Table 3, the water-based erucamide emulsions prepared in Examples 1-3 can make the powder particles uniformly dispersed in the polymer material matrix when used for the activation and wrapping of powder particles, improve the light transmittance and mechanical properties of the plastic product, and increase the smoothness. However, the product cannot resist ultraviolet aging and is prone to aging and discoloration.

[0108] 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 water-based erucamide emulsion on the powder particles was weakened.

[0109] The plastic film prepared in Example 5 and Example 6 has increased transparency and tensile strength, and the surface dynamic friction coefficient and smoothness are increased, but the anti-UV ability is similar to that of Example 1.

[0110] Compared with Example 6, Example 7 and Example 8 are further pre-processed with organic bentonite. It can be seen that the transparency and tensile strength are both increased, and after UV irradiation, the decrease of transparency and tensile strength is reduced, and the anti-UV ability is enhanced.

[0111] Compared with Example 8, polyvinylpyrrolidone, sodium polyacrylate and polyethylene oxide are used as solubilizers in Example 9 and Example 10. It can be seen that the transparency and tensile strength of the prepared plastic film are enhanced, indicating that the powder particle distribution is more uniform, the surface smoothness is better, and after UV irradiation, the transparency decreases, the tensile strength retention rate is large, and the anti-UV aging and discoloration ability is stronger.

[0112] Compared with Example 10, polyvinylpyrrolidone is used as a solubilizer in Example 11. The transparency and tensile strength of the prepared plastic film are weakened, and the anti-UV ability is decreased.

[0113] Compared with Example 10, polyethylene oxide, sodium polyacrylate and polyvinylpyrrolidone are not added in Example 12-14 respectively. As can be seen from the data in Table 3, the transparency and other properties of the plastic film prepared in Example 12-14 are decreased, and after UV irradiation, the aging and discoloration degree is more serious than that of Example 10.

[0114] In Comparative Example 1, no anti-settling agent is added. It can be seen that the transparency is small, the tensile strength is low, and the anti-UV ability is similar to that of Example 1. In Comparative Example 2, hydroxyethyl cellulose is used as an anti-settling agent, and in Comparative Example 3, the anti-settling agent is polyethylene glycol 600. The transparency and tensile strength of the plastic film prepared in Comparative Example 2 and Comparative Example 3 are not as good as those of Example 1. In Comparative Example 4, more erucic acid amide is used, but its effect is not enhanced. In Comparative Example 5, commercially available erucic acid amide emulsion is used. It can be seen that although higher transparency and tensile strength can be obtained, the anti-UV discoloration and anti-UV aging ability are not good.

[0115] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A water-based erucamide emulsion for powder activation and coating, characterized in that, The raw materials include the following parts by weight: 30-40 parts erucamide, 60-70 parts deionized water, 4-8 parts dispersant, 1-2 parts solubilizer, 1-3 parts emulsifier, 1.5-3.5 parts defoamer, 1-1.5 parts anti-settling agent, and 0.3-0.9 parts anti-settling stabilizer; The anti-settling agent comprises polyethylene glycol and nano-silica in a mass ratio of 0.2-0.4:1, wherein the polyethylene glycol is polyethylene glycol 600; the anti-settling stabilizer is at least one of organobentonite, polyamide wax, polyethylene wax and montmorillonite.

2. The water-based erucamide emulsion for powder activation and coating according to claim 1, characterized in that: The method for preparing the anti-settling agent is as follows: Nano-silica is dispersed in deionized water to form a suspension with a concentration of 2-2.5 wt%. The pH is adjusted to 2-2.5, and the suspension is sonicated for 5-10 min. Carboxylates are added, and the suspension is stirred and dispersed for 20-30 min. Polyethylene glycol is then added, and the mixture is stirred evenly to obtain an anti-settling agent. The mass ratio of carboxylates to nano-silica is 0.01-0.02:

1.

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

4. The water-based erucamide emulsion for powder activation and coating according to claim 1, characterized in that: The organic bentonite undergoes the following pretreatment: Organobentonite is ultrasonically dispersed in acid solution for 1-2 hours, boiled for 90-100 minutes, cooled, washed until neutral, and filtered to obtain acidified organobentonite. Disperse the acidified organic bentonite into deionized water, stir until a suspension with a concentration of 1.5-2wt% is formed, add aluminum sulfate solution, adjust the pH to 5-6, let stand for 2-4 hours, wash, filter, dry at 105-110℃ for 2-4 hours, and then calcine at 300-320℃ for 4-6 hours.

5. The water-based erucamide emulsion for powder activation and coating according to claim 1, characterized in that: The solubilizer comprises polyvinylpyrrolidone, sodium polyacrylate, and polyethylene oxide in a mass ratio of 1:0.02-0.1:0.1-0.

2.

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

7. The water-based erucamide emulsion for powder activation and coating according to claim 1, characterized in that: The emulsifier is selected from at least one of erythritol, oligosaccharides, paraffin, stearate and sodium dodecylbenzenesulfonate.

8. The water-based erucamide emulsion for powder activation and coating according to claim 1, characterized in that: The defoamer is selected from polyether-modified polydimethylsiloxane or polyoxyethylene polyoxypropylene amine ether.

9. The method for preparing the powder activation and coating aqueous erucamide emulsion according to any one of claims 1-8, characterized in that: Includes the following steps: Mix the dispersant, solubilizer, emulsifier and deionized water, and stir at 30-35℃ for 10-20 min to obtain a stable solution; Add erucamide to the stabilized solution and stir at 80-100℃ for 10-20 min to obtain a suspension; Add the anti-settling agent, anti-settling stabilizer and defoamer to the suspension, stir at 30-35℃ for 10-20 min, and then grind for 6-7 h to obtain a mixture; The mixture was ultrasonically dispersed at 35-40℃ for 10-20 minutes to obtain an aqueous erucamide emulsion.

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