A paraffin emulsion composition and a method for preparing the same

Abstract

The application discloses a paraffin emulsion composition and a preparation method thereof. The composition comprises 20-40 parts of paraffin, 0.5-5 parts of ethylene-vinyl acetate copolymer wax, 1-3 parts of a composite emulsifier, 0.1-3 parts of a water-soluble polymer, 0.1-1 parts of a small-molecule alcohol and 45-80 parts of water. The ethylene-vinyl acetate copolymer wax and the water-soluble polymer are introduced, so that the amount of the emulsifier is reduced, the stability of the paraffin emulsion is improved, the production process of the emulsified wax is simple, the energy consumption is low, the product has good dispersibility and can be stored for a long time.

Description

Technical Field

[0001] This invention belongs to the field of wax emulsion technology, specifically relating to a paraffin emulsion composition and its preparation method. Background Technology

[0002] Since wax is solid at room temperature and inconvenient to use, people have studied paraffin emulsions to compensate for its lack of fluidity.

[0003] Paraffin emulsions are formed by uniformly dispersing natural or synthetic waxes in water, utilizing the directional adsorption of emulsifiers to alter their surface tension, and then applying mechanical force to create a homogeneous and stable fluid containing wax and water. Paraffin emulsions require no heating, melting, or dissolving during use, form uniform films, have good coverage, and are easily compounded with aqueous solutions or emulsions of other substances. They offer advantages such as safety, high efficiency, and cost-effectiveness.

[0004] Currently, extensive and in-depth research has been conducted on paraffin emulsions both domestically and internationally. Paraffin emulsions are gradually evolving into a series of refined, large-scale, high-value-added, and high-tech specialty wax products, widely used in agriculture, textiles, papermaking, construction, food, ceramics, and energy storage materials. However, paraffin emulsions are thermodynamically unstable systems. Due to the weak cohesive forces within paraffin molecules and the low surface tension of paraffin particles, they easily aggregate into large particles. Prolonged storage can lead to stratification or paraffin precipitation, affecting the further use of the paraffin emulsion. To address these issues, emulsifiers in the system can reduce the interfacial free energy and surface tension of the dispersion system, thereby significantly improving stability. Therefore, the proportions of emulsifiers and additives play a crucial role in the preparation of paraffin emulsions. Secondly, a good formulation requires a good process to translate into a good product. The same raw material ratio, using different processes, can produce paraffin emulsions with different indicators and properties. Therefore, selecting appropriate surfactants, additives, and processes is necessary to prepare paraffin emulsion products with stable performance and good dispersibility.

[0005] Patent CN1570038A discloses a paraffin emulsifier composed of the following components in a series of weight ratios: 20-30 parts lauryl alcohol, 20-30 parts ethylene oxide, 40-50 parts monoglyceride, 5-15 parts stearic acid, and 5-15 parts ethanol. The emulsified paraffin prepared with this emulsifier exhibits strong stability and resistance to acids and alkalis. However, this method requires a large amount of emulsifier, and ethylene oxide is toxic, flammable, and explosive, making it unsuitable for long-distance transportation.

[0006] Chinese patent CN 110028799A describes the preparation of highly dispersible paraffin emulsions using supercritical extraction technology. First, ultrafine nanoparticles are prepared using supercritical extraction. Then, these nanoparticles are mixed sequentially with an emulsifier and distilled water to obtain the final product. The paraffin emulsions prepared by this method exhibit good dispersibility and stability. However, this method requires the use of organic solvents for dissolution, and the extraction process is demanding with high energy consumption. Furthermore, the solvent needs to be evaporated and recovered after extraction, making the process cumbersome.

[0007] Chinese patent CNCN103773249B discloses an automotive paraffin emulsion and its preparation method. The raw material formulation of the automotive emulsion, based on the mass percentage of the raw materials, consists of: 22-58% Phase A, 10-30% Phase B, 21.05-60.5% Phase C, 0.55-5.5% Phase D, and 0.2-3% Phase E. Phase A comprises 7-18% silicone oil and 15-40% odorless solvent oil; Phase B comprises 10-30% mixed wax; Phase C comprises 0.5-5% ethylene glycol, 20-50% deionized water, 0.5-5% thickener, and 0.05-0.5% acrylate copolymer; Phase D comprises 0.5-5% fatty alcohol polyoxyethylene ether and 0.05-0.5% triethanolamine; and Phase E comprises 0.2-3% alkylphenol polyoxyethylene ether. This method involves adding a large number of additives to the formula, resulting in a complex formulation and a cumbersome preparation process, which increases production and manufacturing costs.

[0008] Chinese patent CN102226061A discloses a method for preparing marble wax. The marble wax raw materials include 10-20 parts by weight of mixed paraffin wax, 5-15 parts by weight of composite emulsifier, 5-15 parts by weight of co-emulsifier, 0.5-2 parts by weight of brightening agent, 1-2 parts by weight of stabilizer, and 50-80 parts by weight of water. The co-emulsifier is any one or a combination of ethylene glycol, propylene glycol, butanediol, and diethylene glycol. The stabilizer is any one or a combination of sulfonated fatty acid alkyl ester and sodium dioctyl sulfosuccinate. In the preparation process, the mixed paraffin wax is melted, then the composite emulsifier, co-emulsifier, and some water are added for emulsification. Then, the brightening agent, stabilizer, and remaining water are added to obtain the finished product. This process involves a large amount of emulsifier and is relatively complex.

[0009] The above-mentioned patents suffer from drawbacks, such as the high production cost due to the need for a large amount of emulsifier to ensure emulsion stability during the preparation of paraffin emulsions. Therefore, there is an urgent need for a method to prepare paraffin emulsions that can significantly reduce the amount of emulsifier used while ensuring the stability of the paraffin emulsion. Summary of the Invention

[0010] The purpose of this invention is to provide a paraffin emulsion composition to solve the defect in the prior art that requires the addition of a large amount of emulsifier to ensure the stability of paraffin emulsions.

[0011] Another objective of this invention is to provide a method for preparing a paraffin emulsion composition.

[0012] To achieve the above objectives, the present invention provides a paraffin emulsion composition comprising, by weight, 20-40 parts paraffin, 0.5-5 parts ethylene-vinyl acetate copolymer wax, 1-3 parts composite emulsifier, 0.5-3 parts water-soluble polymer, 0.1-1 parts small molecule alcohol and 45-80 parts water.

[0013] The paraffin emulsion composition of the present invention comprises, by weight, 25-35 parts paraffin, 1-4 parts ethylene-vinyl acetate copolymer wax, 1.2-2.8 parts composite emulsifier, 0.8-2.5 parts water-soluble polymer, 0.2-0.9 parts small molecule alcohol and 45-70 parts water.

[0014] The paraffin emulsion composition of the present invention comprises a water-soluble polymer, wherein the polymer is polyethylene glycol and / or polypropylene glycol.

[0015] The introduction of water-soluble polymers mainly acts as thickeners, which can increase the viscosity of wax emulsions, reduce the Brownian motion of droplets, and improve the chemical and mechanical stability of wax emulsions. At the same time, it can also reduce the amount of emulsifier used and reduce the probability of collision between droplets, resulting in a more stable emulsified wax.

[0016] The paraffin emulsion composition of the present invention comprises a small molecule alcohol having 4 or fewer carbon atoms, preferably one or more of ethanol, propanol, glycerol and butanediol.

[0017] Adding small molecule alcohols can act as co-emulsifiers in paraffin emulsions, working synergistically with surfactants to form an oil-water mixed film, disrupting the ordered arrangement of the aqueous phase, improving the flexibility of the oil-water interface film, reducing the amount of emulsifier required, and the hydroxyl groups in alcohols can form hydrogen bonds with water, reducing the surface tension coefficient of the emulsion, thereby reducing the emulsion particle size and enhancing the stability of the emulsion.

[0018] The paraffin emulsion composition of the present invention uses a nonionic emulsifier as the composite emulsifier.

[0019] The paraffin emulsion composition of the present invention comprises one or more of Tween 80, Tween 60, Tween 20, Span 80, and Span 20.

[0020] The paraffin emulsion composition of the present invention has an HLB of 9 to 10 for the composite emulsifier.

[0021] Because paraffin molecules have weak cohesive forces and low surface tension in paraffin emulsions, they easily aggregate into large particles. To mix paraffin with water to form a stable O / W paraffin emulsion, the emulsifier molecule must contain groups with a structure similar to paraffin to achieve affinity and obtain a stable emulsion. The composite emulsifier described in this invention is a nonionic emulsifier, composed of two or more of Tween 80, Tween 60, Tween 20, Span 80, and Span 20. The hydrophilic-lipophilic balance (HLB) value of the emulsifier, when mixed in proportion, is similar to that of paraffin, approximately 9-10. According to the principle of "like dissolves like," paraffin can be more fully dispersed in water to form an O / W emulsion.

[0022] The paraffin emulsion composition of the present invention has an ethylene-vinyl acetate copolymer wax with a melting point of 80-90°C.

[0023] Because the molecular chain of ethylene-vinyl acetate copolymer wax (EVA wax) contains a certain amount of carbonyl and hydroxyl groups, it has strong hydrophilicity. When used in combination with paraffin wax, it has the following two effects: First, the polyethylene part of EVA wax represents long-chain alkyl groups, which are lipophilic, while the polyvinyl acetate part represents polar groups, which are hydrophilic. Therefore, the wax has good emulsifying properties, and adding EVA wax can greatly reduce the amount of emulsifier needed. Second, EVA wax has a relatively long molecular chain, which forms an interfacial film with strong mechanical strength and film elasticity at the oil / water interface. This prevents the collision and merging of emulsion droplets, and inhibits or prevents small droplets from colliding and condensing into large droplets, thereby improving the stability of the emulsion.

[0024] Meanwhile, the EVA wax and the water-soluble polymer chains are intertwined, exhibiting a strong synergistic effect, which can further enhance the stability of the interfacial film, prevent the paraffin particles from contacting each other, and further enhance the stability of the paraffin emulsion.

[0025] To achieve the above objectives, the present invention also provides a method for preparing a paraffin emulsion composition, comprising the following steps:

[0026] (1) Mix paraffin wax, ethylene-vinyl acetate copolymer wax and composite emulsifier, heat to melt and stir evenly to obtain an oil phase dispersion mixture;

[0027] (2) Add small molecule alcohol and water-soluble polymer to water and heat to obtain an aqueous dispersion mixture;

[0028] (3) Under stirring conditions, the aqueous phase dispersion mixture is added to the oil phase dispersion mixture for emulsification to obtain a paraffin emulsion.

[0029] The method for preparing the paraffin emulsion composition of the present invention includes heating to 90-110°C in step (1), heating to 70-90°C in step (2), emulsification time of 30-60 min in step (3), emulsification temperature of 80-110°C, and stirring speed of 500-800 r / min.

[0030] When an aqueous dispersion is added to an oil dispersion, under suitable HLB values ​​and the action of emulsifiers, the emulsifier molecules adsorbed on the surface of the oil phase will move closer to the water molecules to form a W / O type emulsion. As the volume of the aqueous phase increases, a layered liquid crystal structure is formed. If the amount of water is further increased, the emulsion system will transform into an O / W type paraffin emulsion. The color of the emulsion system changes from slightly yellow and transparent to semi-transparent to milky white and viscous to milky white. This process can gradually dissolve oil droplets, reduce the probability of their aggregation, and obtain a relatively fine and stable emulsion.

[0031] The beneficial effects of this invention are:

[0032] This invention introduces EVA wax, water-soluble polymer, and small molecule alcohol, which can greatly reduce the amount of emulsifier used. The amount of emulsifier used is only 1% to 3% of that in paraffin emulsion. At the same time, the strong synergistic effect between EVA wax and water-soluble polymer molecules can significantly enhance the stability of paraffin emulsion. This product has good dispersibility and can be stored for a long time. Detailed Implementation

[0033] The present invention will now be described in detail through embodiments. It should be noted that the following embodiments are only for further illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above description.

[0034] Evaluation and analysis methods:

[0035] Centrifugal stability: The centrifugal stability of the emulsion was determined according to GB11543-89. The emulsion was centrifuged at 4000 r / min for 15 min and observed to see if it separated into layers.

[0036] Dispersion is divided into five levels, with level one being the best and level five being the worst.

[0037] Level 1: When the wax emulsion is dropped into water, it can be quickly dispersed into a blue fluorescent mist-like dispersion, which becomes a blue or pale white transparent solution after slight stirring.

[0038] Secondary: When the wax emulsion is dropped into water, it quickly and automatically disperses into a blue-white, misty, fluorescent dispersion. With slight stirring, it becomes a blue, translucent solution. Tertiary: When the wax emulsion is dropped into water, it forms a white, cloudy, or streak-like dispersion. After stirring, a milky-white, slightly fluorescent, opaque emulsion is obtained.

[0039] Level 4: When the wax emulsion is dropped into water, it forms large particles that float on the surface. After stirring, it still becomes a milky white, opaque emulsion.

[0040] Level 5: When the wax emulsion is dropped into water, it forms large particles that float on the surface. Although it can be emulsified after stirring, it immediately separates into layers, with the wax rising to the top.

[0041] Raw material source:

[0042] No. 58 semi-refined paraffin wax, Daqing Petrochemical Company of China National Petroleum Corporation;

[0043] Ethylene-vinyl acetate copolymer wax (EVA wax), TLZJ-8 type, melting point, 80~90℃, Chengdu Tongli Additives Co., Ltd.

[0044] Tween 80, Tween 60, Tween 20, Span 80, Span 20, polyethylene glycol, polypropylene glycol, ethanol, glycerin, butylene glycol, Sinopharm Chemical Reagent Co., Ltd.

[0045] Example 1

[0046] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 300g of No. 58 semi-refined paraffin wax, 40g of EVA wax, 20g of composite emulsifier (Tween 80, Span 80, mass ratio of 11:6, HLB value of 9.5), 20g of polyethylene glycol (PEG600), 5g of butylene glycol, and 615g of water.

[0047] Paraffin wax, EVA wax, and a composite emulsifier were placed in a reaction vessel and heated together to 100°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture (A). Butylene glycol and polyethylene glycol were added to water and heated to 80°C to obtain an aqueous-phase dispersion mixture (B). At 100°C, the aqueous solution of B was slowly added to A, and the mixture was stirred at a constant temperature for 40 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin emulsion.

[0048] Example 2

[0049] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 200g of No. 58 semi-refined paraffin wax, 10g of EVA wax, 10g of composite emulsifier (Tween 60, Span 80, mass ratio of 11:4, HLB value of 9.0), 5g of polyethylene glycol (PEG600), 1g of ethanol, and 774g of water.

[0050] Paraffin wax, EVA wax, and a composite emulsifier were placed in a reaction vessel and heated together to 110°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture (A). Ethanol and polyethylene glycol were added to water and heated to 80°C to obtain an aqueous-phase dispersion mixture (B). At 100°C, the aqueous solution of B was slowly added to A, and the mixture was stirred at a constant temperature for 30 minutes at a stirring speed of 550 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin emulsion.

[0051] Example 3

[0052] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 400g of No. 58 semi-refined paraffin wax, 50g of EVA wax, 30g of compound emulsifier (Tween 20, Span 20, mass ratio of 1:4, HLB value of 10.0), 30g of polypropylene glycol (PPG400), 10g of glycerin, and 480g of water.

[0053] Paraffin wax, EVA wax, and a composite emulsifier were placed in a reaction vessel and heated together to 110°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture (A). Glycerin and polypropylene glycol were added to water and heated to 80°C to obtain an aqueous-phase dispersion mixture (B). At 110°C, the aqueous solution of B was slowly added to A, and the mixture was stirred at a constant temperature for 60 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin emulsion.

[0054] Example 4

[0055] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 250g of No. 58 semi-refined paraffin wax, 5g of EVA wax, 20g of compound emulsifier (Tween 20, Span 20, mass ratio of 1:4, HLB value of 10.0), 15g of polypropylene glycol (PPG600), 10g of glycerin, and 700g of water.

[0056] Paraffin wax, EVA wax, and a composite emulsifier were placed in a reaction vessel and heated together to 100°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture (A). Glycerin and polypropylene glycol were added to water and heated to 80°C to obtain an aqueous-phase dispersion mixture (B). At 110°C, the aqueous solution of B was slowly added to A, and the mixture was stirred at a constant temperature for 50 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin emulsion.

[0057] Comparative Example 1

[0058] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 300g of No. 58 semi-refined paraffin wax, 120g of compound emulsifier (Tween 80, Span 80, mass ratio of 11:6, HLB value of 9.5), and 615g of water.

[0059] Paraffin wax and a composite emulsifier were placed in a reaction vessel and heated together to 100°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture (A). Water was heated to 80°C. At 100°C, the aqueous solution was slowly added to A, and the mixture was stirred at a constant temperature for 40 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin wax emulsion.

[0060] Comparative Example 2

[0061] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 300g of No. 58 semi-refined paraffin wax, 20g of compound emulsifier (Tween 80, Span 80, mass ratio of 11:6, HLB value of 9.5), and 615g of water.

[0062] Paraffin wax and a composite emulsifier were placed in a reaction vessel and heated together to 100°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture (A). Water was heated to 80°C. At 100°C, the aqueous solution was slowly added to A, and the mixture was stirred at a constant temperature for 40 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin wax emulsion.

[0063] Comparative Example 3

[0064] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 200g of No. 58 semi-refined paraffin wax, 10g of EVA wax, 10g of compound emulsifier (Tween 80, Span 80, mass ratio of 11:6, HLB value of 9.5), and 774g of water.

[0065] Paraffin wax, EVA wax, and a composite emulsifier were placed in a reaction vessel and heated together to 110°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture. Water was heated to 80°C. The aqueous solution was slowly added to A at 100°C, and the mixture was stirred at a constant temperature for 30 minutes at a stirring speed of 550 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin wax emulsion.

[0066] Comparative Example 4

[0067] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 400g of No. 58 semi-refined paraffin wax, 30g of compound emulsifier (Tween 80, Span 80, mass ratio of 11:6, HLB value of 9.5), 10g of glycerin, and 490g of water.

[0068] Paraffin wax and a composite emulsifier were placed in a reaction vessel and heated together to 100°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture. Glycerin was added to water and heated to 80°C to obtain an aqueous-phase dispersion mixture (B). At 110°C, the aqueous solution of B was slowly added to A, and the mixture was stirred at a constant temperature for 60 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin wax emulsion.

[0069] Comparative Example 5

[0070] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 400g of No. 58 semi-refined paraffin wax, 30g of compound emulsifier (Tween 80, Span 80, mass ratio of 11:6, HLB value of 9.5), 20g of polypropylene glycol (PPG400), and 490g of water.

[0071] Paraffin wax and a composite emulsifier were placed in a reaction vessel and heated together to 100°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture A. Polypropylene glycol was added to water and heated to 80°C to obtain an aqueous-phase dispersion mixture (B). At 110°C, the aqueous solution of B was slowly added to A, and the mixture was stirred at a constant temperature for 60 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin wax emulsion.

[0072] Comparative Example 6

[0073] The raw materials were weighed according to their weight proportions. The specific formula of the raw materials is as follows: 300g of No. 58 semi-refined paraffin wax, 40g of polyethylene wax (melting point, 90℃), 20g of composite emulsifier (Tween 80, Span 80, mass ratio of 11:6, HLB value of 9.5), 20g of polyethylene glycol (PEG600), 5g of butanediol, and 615g of water.

[0074] Paraffin wax, polyethylene wax, and a composite emulsifier were placed in a reaction vessel and heated together to 100°C to melt and stir until homogeneous, obtaining an oil-phase dispersion mixture (A). Butylene glycol and polyethylene glycol were added to water and heated to 80°C to obtain an aqueous-phase dispersion mixture (B). At 100°C, the aqueous solution of B was slowly added to A, and the mixture was stirred at a constant temperature for 40 minutes at a stirring speed of 600 r / min until the mixture was completely emulsified. The resulting solution was cooled to obtain a stable paraffin emulsion.

[0075] The obtained emulsified wax product was analyzed:

[0076] Table 1. Properties of raw materials and products in Examples and Comparative Examples

[0077] Appearance Centrifugal stability stability Dispersion Example 1 Milky white, fine and even Centrifugation without stratification 10 months Level 1 Example 2 Milky white, fine and even Centrifugation without stratification 11 months Level 1 Example 3 Milky white, fine and even Centrifugation without stratification 10 months Level 1 Example 4 Milky white, fine and even Centrifugation without stratification 9 months Level 1 Comparative Example 1 Milky white, fine and even Centrifugation without stratification 6 months Level 1 Comparative Example 2 paste Centrifugal stratification 10 days Level 4 Comparative Example 3 Thick emulsion Centrifugation without stratification 60 days Level 3 Comparative Example 4 fine particles Centrifugal stratification 20 days Level 3 Comparative Example 5 fine particles Centrifugal stratification 40 days Level 3 Comparative Example 6 fine particles Centrifugal stratification 30 days Level 3

[0078] Data from the examples and comparative examples show that a fine and uniform paraffin emulsion can only be prepared with a large amount of composite emulsifier. However, its long-term stability is still inferior to that of the examples, indicating that the present invention has a significant advantage in maintaining the stability of paraffin emulsions. Using the same process conditions, the use of a compound of EVA wax, water-soluble polymer, and small molecule alcohol can significantly improve the stability of paraffin emulsions. The paraffin product is a milky white, fine, and uniform mixture with good dispersibility and long storage time. Using any one of the additives alone cannot achieve the same effect.

[0079] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the claims of the present invention.

Claims

1. A paraffin emulsion composition, characterized in that, By weight, it includes 20-40 parts paraffin wax, 0.5-5 parts ethylene-vinyl acetate copolymer wax, 1-3 parts composite emulsifier, 0.5-3 parts water-soluble polymer, 0.1-1 parts small molecule alcohol and 45-80 parts water; The water-soluble polymer is polyethylene glycol and / or polypropylene glycol; The small molecule alcohol is an alcohol with 4 or fewer carbon atoms; The composite emulsifier is one or more of Tween 80, Tween 60, Tween 20, Span 80, and Span 20.

2. The paraffin emulsion composition according to claim 1, characterized in that, By weight, it comprises 25-35 parts paraffin wax, 1-4 parts ethylene-vinyl acetate copolymer wax, 1.2-2.8 parts composite emulsifier, 0.8-2.5 parts water-soluble polymer, 0.2-0.9 parts small molecule alcohol and 45-70 parts water.

3. The paraffin emulsion composition according to claim 1, characterized in that, The small molecule alcohol is one or more of ethanol, propanol, glycerol, and butanediol.

4. The paraffin emulsion composition according to claim 1, characterized in that, The HLB value of the composite emulsifier is 9-10.

5. The paraffin emulsion composition according to claim 1, characterized in that, The melting point of the ethylene-vinyl acetate copolymer wax is 80~90℃.

6. A method for preparing the paraffin emulsion composition according to any one of claims 1 to 5, characterized in that, Includes the following steps: (1) Mix paraffin wax, ethylene-vinyl acetate copolymer wax and composite emulsifier, heat to melt and stir evenly to obtain an oil phase dispersion mixture; (2) Add small molecule alcohol and water-soluble polymer to water and heat to obtain an aqueous dispersion mixture; (3) Under stirring conditions, the aqueous phase dispersion mixture is added to the oil phase dispersion mixture for emulsification to obtain a paraffin emulsion.

7. The method for preparing the paraffin emulsion composition according to claim 6, characterized in that, In step (1), the temperature is heated to 90~110℃, in step (2) the temperature is heated to 70~90℃, in step (3) the emulsification time is 30~60min, the emulsification temperature is 80~110℃, and the stirring speed is 500~800 r / min.