Functional master batch material for polypropylene and preparation method of functional master batch material

Abstract

The invention provides a functional master batch material for polypropylene and a preparation method of the functional master batch material. The functional master batch material is prepared from the following components in parts by mass: 20 parts of polysiloxane, 20 parts of treated silicon dioxide, 10 parts of polypropylene resin, 50 parts of high-carbon-chain ethoxyamide wax and 0.5 part of a processing aid bag, the molecular weight of the polysiloxane is 1,000,000-1,200,000, and the polysiloxane is a solid; the treated silicon dioxide is silicon dioxide treated by vinyl trimethoxy silane, and is a nanoscale material extracted from corn straw ash after power generation in a physical and chemical manner; the polypropylene resin is resin of which the MFR is 10 to 20g / 10min; the high-carbon-chain ethoxy amide wax is a KF-027 product produced by Zhejiang Jia Hua Refining Co., Ltd. The processing aid bag is an antioxidant; the invention has the advantages that: the demoulding property of the polypropylene material is improved; the process of flame treatment in the spraying process is reduced, the cost of the spraying process is reduced, and the adhesive force of the paint surface after spraying can meet the requirement.

Description

Technical Field

[0001] This invention belongs to the field of plastic masterbatch technology, specifically relating to a functional masterbatch material for polypropylene and its preparation method. Background Technology

[0002] Currently, modified materials requiring spray coating often encounter various problems during injection molding, with difficulty in demolding and poor paint adhesion after spraying being the main issues. Solving these problems often requires adding different types of additives, and the amount added is difficult to control. Adding multiple types of additives may trigger rejection reactions or cause problems during later use. Therefore, it is necessary to consider the various components, amounts, and interactions of additives in the formulation to ensure that the physical blending meets the requirements of production and subsequent use.

[0003] Currently, cars have become an indispensable means of transportation for families. Stylish and cool designs and vibrant colors are the first impressions people have when choosing a car. The exterior of a car is mainly composed of sheet metal and plastic, and most exterior parts require painting. The painting of plastic exterior parts involves multiple processes, among which injection molding and painting are the most important and also the two processes with the highest scrap rates. During injection molding, sticking to the mold is the most common problem. Mold-related and material-related issues can cause difficulties in demolding. Injection molding manufacturers usually ask material suppliers to improve the material's release properties, while material manufacturers often add oily additives. During injection molding, low-molecular-weight additives are easily volatile at high temperatures and have significant migration properties. When the temperature drops to room temperature, the solubility of the additives in the plastic substrate decreases, causing them to gradually migrate from the interior to the surface, easily leading to precipitation. Barrier effect: The oil layer forms a barrier between the plastic and the paint, preventing direct contact between paint molecules and the plastic substrate, thus reducing their physical and chemical bonding forces. Poor wetting: The presence of oil alters the wetting properties of the plastic surface, making it difficult for the paint to spread evenly and easily leading to defects such as pinholes and craters, further weakening the adhesion of the paint layer. Contamination problem: Oil may contain impurities and chemicals, which may trigger chemical reactions during spraying, causing the coating to discolor, blister, or peel off. Therefore, it is necessary to develop a functional masterbatch material for polypropylene to effectively solve the above problems.

[0004] Chinese Patent CN113999575B discloses a recycled polypropylene spraying material and its preparation method. The material is prepared from the following components in parts by weight: 61-85 parts polypropylene, 5-15 parts high-melting-point toughening agent, 4-10 parts silica-grafted butyl acrylate, 2-20 parts filler, 0.2-0.3 parts antioxidant, 0.2-0.3 parts lubricant, and 0.3-0.8 parts carbon black. The invention utilizes recycled polypropylene material for sprayable polypropylene. To improve the adhesion and bonding between the recycled polypropylene and the paint substrate, a synthetic silica-grafted butyl acrylate adhesive and a high-melting-point toughening agent are incorporated into the recycled polypropylene material. This enhances the adhesion and bonding between the composite material and the paint. Furthermore, the high-melting-point toughening agent, dispersed on the surface of the polypropylene material, maintains a good dispersion during the paint baking and curing stage. After the paint cures, it exhibits excellent adhesion strength to the substrate, meeting the requirement for excellent adhesion of exterior sprayed polypropylene. Although this invention improves the spraying effect of recycled polypropylene materials, it still requires flame treatment to increase the adhesion of the paint surface. From the raw material to the finished spraying process, it cannot reduce the number of spraying steps or lower the spraying cost.

[0005] Chinese Patent CN103131164B discloses an additive for injection molding white PA plastic and a method for injection molding white PA plastic parts. This invention relates to an additive for injection molding white PA plastic and a method for injection molding white PA plastic parts. The additive includes one or more of a siloxane polymer resin and a modified siloxane polymer resin. The weight percentages of the siloxane polymer resin and / or the modified polysiloxane polymer resin, and the white PA plastic are as follows: siloxane polymer resin and / or the modified polysiloxane polymer resin: 2‰ to 5‰; white PA plastic: balance. This invention, by adding a siloxane polymer resin and / or the modified siloxane polymer resin to the white PA plastic, prevents the white PA plastic from sticking to the mold during injection molding and demolding. It also improves the viscosity of the white PA plastic sol, and improves the surface gloss and wear resistance of the white PA plastic injection molded parts. However, the additives used for demolding in this invention are siloxane polymer resin and modified polysiloxane polymer resin, and the degree of polymerization of these two polymers is 1 to 1000. The two additives with this degree of polymerization are liquids. Although the demolding effect is very good, they will gradually precipitate out of the surface of the product over time.

[0006] In summary, no existing functional masterbatch can simultaneously meet the requirements of both mold release and paint adhesion. Therefore, there is an urgent need to develop a functional masterbatch material for polypropylene that enables polypropylene to simultaneously fulfill both of these functions during use. Summary of the Invention

[0007] In view of the above problems, the purpose of this invention is to provide a functional masterbatch material for polypropylene and its preparation method, which solves the problem of paint adhesion after demolding and spraying, so as to overcome the shortcomings of the prior art.

[0008] This invention provides a functional masterbatch material for polypropylene, which is composed of the following components in parts by weight: polysiloxane: 15-23 parts, treated silica: 15-25 parts, polypropylene resin: 10-35 parts, high carbon chain ethoxyamide wax: 30-50 parts, and processing aid package: 0.5 parts.

[0009] As a preferred embodiment of the present invention, the functional masterbatch material is composed of the following components in parts by weight: polysiloxane: 20 parts, treated silica: 20 parts, polypropylene resin: 10 parts, high carbon chain ethoxyamide wax: 50 parts, and processing aid package: 0.5 parts.

[0010] As a preferred embodiment of the present invention, the polysiloxane has a molecular weight of 1,000,000 to 1,200,000 and is a solid.

[0011] As a preferred embodiment of the present invention, the treated silica is vinyltrimethoxysilane-treated silica, which is a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods.

[0012] As a preferred embodiment of the present invention, the polypropylene resin is a resin with an MFR of 10-20 g / 10 min.

[0013] As a preferred embodiment of the present invention, the high-carbon chain ethoxyamide wax is KF-027 produced by Zhejiang Jiahua Fine Chemicals Co., Ltd.

[0014] As a preferred embodiment of the present invention, the processing aid package is an antioxidant; a hindered phenolic antioxidant and a phosphite antioxidant are compounded in a 1:2 ratio. The hindered phenolic antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate, and N,N′-1,6-hexylene-bis[3,5-di-tert-butyl-4-hydroxyphenylpropionamide]. The phosphite antioxidant includes at least one of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol diphosphite bisoctadecyl ester, and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite ester.

[0015] Another objective of this invention is to provide a method for preparing functional masterbatch materials for polypropylene, comprising the following steps: selecting corn stalk ash after power generation, ball milling, followed by water treatment; utilizing potassium oxide in the stalk ash and water to prepare potassium hydroxide (4KO2+2H2O→4KOH+3O2↑); concentrating the potassium hydroxide and reacting it with silicon dioxide in a portion of the filtered dry matter (SiO2+2KOH→K2SiO3+H2O); filtering; and then reacting it with potassium silicate using hydrochloric acid (K2SiO3+2HCl→H2SiO3↓).

[0016] Silica was prepared by adding 2KCl, and the silica was at the nanoscale (by controlling the concentration of potassium silicate, the overall pH value after adding hydrochloric acid to potassium silicate, and the stirring speed). It was then treated with vinyltrimethoxysilane coupling agent. Polysiloxane, treated silica, polypropylene resin, high carbon chain ethoxyamide wax, and processing aid package were weighed according to the proportion, put into a Hacker mixer, and then extruded and granulated to form functional masterbatch.

[0017] As a preferred embodiment of the present invention, the following steps are also included:

[0018] Step A: Select corn stalk ash after power generation, grind it in a ball mill to prepare it into powder with a D50 of 55 microns;

[0019] Step B: In a sealed container under a nitrogen atmosphere, add 3 times the volume of deionized water from Step A, stir at 50 RPM for 45 minutes to form a mixture;

[0020] Step C: Open the valve and transport the mixture from Step B to the dry-wet separator via pipeline. Filter the mixture using a pressure filter. Set aside the filtered dry matter. Take a certain amount of the dry matter and react it with the silica in the dry matter using a 35% potassium hydroxide solvent (100℃, 50 RPM stirring, 6 hours). Calculate the silica content in the dry matter based on the amount of potassium hydroxide used. Store the filtered liquid and any insoluble particles in a sealed tank filled with atmospheric nitrogen. Open the tank valve and transport the mixture via pipeline to a vacuum filtration device for vacuum filtration at a vacuum degree of -0.06 MPa. The resulting solution is a potassium hydroxide aqueous solution (determined by acid-base titration and flame test). Add the potassium hydroxide solution to a sealed concentration tank filled with nitrogen at atmospheric pressure and concentrate the potassium hydroxide aqueous solution (by heating) to a concentration of 34%-36%.

[0021] Step D: In a sealed container under a nitrogen atmosphere, calculate the mass of the dry matter filtered out in step C based on the amount of concentrate in step C, stir at 100°C and 50 RPM for 6 hours to obtain a mixture.

[0022] Step E: Use a plate filter press (800 mesh filter cloth) to filter the mixture obtained in step D to obtain a turbid liquid. Add 3.5 times the volume of deionized water to the turbid liquid, stir at 50 RPM for 35 minutes, and then vacuum filter at a vacuum degree of -0.06 MPa to obtain a clear aqueous solution.

[0023] Step F: Concentrate the clear aqueous solution obtained in step E (heat evaporation, stirring at 60 RPM) to a concentration of 25%-35%;

[0024] Step G: Add emulsifier T-20 to the concentrate obtained in step F, adding 1.2% of the concentrate volume, and then add 18% hydrochloric acid. Control the overall pH value of the material at 7.7-8.6, stir at 274 RPM, 95℃-98℃ for 4 hours to obtain white sediment, and then vacuum filter at a vacuum degree of -0.06 MPa to obtain white silica SiⅠ.

[0025] Step H: Rinse the silica SiⅠ obtained in step G with deionized water, adding 3.5 times the volume of silica SiⅠ with deionized water each time, for a total of three rinses, each lasting 30 minutes with stirring at 120 RPM. In the first two rinses, only the deionized water on the top of the silica SiⅠ is drained. The last rinse requires vacuum filtration at a vacuum degree of -0.06 MPa, finally obtaining white silica SiⅡ. Dry the white silica SiⅡ in a hollow chamber at 145℃ under a vacuum degree of -0.06 MPa, finally obtaining white silica SiⅢ (the particle size was measured by a laser particle size analyzer, and its D90 was at the nanometer level).

[0026] Step I: Weigh the white silica III obtained in Step H and add it to a sealed reaction vessel. Dilute vinyltrimethoxysilane with anhydrous ethanol (75% content) and spray it into the reaction vessel. Spraying is completed in 5 minutes, and the spraying amount is 3.2% of the mass of white silica III. The container temperature is 95℃, and the mixture is stirred at 240 RPM for 140 minutes to form coarse silica. Wash the coarse silica with anhydrous ethanol, adding 3.5 times the volume of anhydrous ethanol each time, and wash three times. Stir at 120 RPM for 30 minutes each time. For the first two washes, the upper layer of silica liquid is directly discharged. For the last wash, vacuum filter is performed at a vacuum degree of -0.06 MPa. Then, vacuum dry at 145℃ at a vacuum degree of -0.06 MPa to obtain the treated silica.

[0027] Step J: Weigh the treated silica, polysiloxane with a molecular weight of 1,000,000-1,200,000, polypropylene resin, high carbon chain ethoxyamide wax, and processing aids according to the specified mass, put them into the HAAKE torque rheometer, mix them thoroughly, and then granulate them by extrusion to finally obtain the functional masterbatch.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] I. Reducing the flame treatment process during spraying lowers the cost of the spraying process, while ensuring that the paint adhesion meets requirements after spraying (1. The treated silica has a nano-sized particle size (measured by a laser particle size analyzer), a large specific surface area, and when dispersed in the material, it carries vinyltrimethoxysilane, whose polar groups are beneficial to paint adhesion and improve the spraying effect; 2. The high-carbon chain ethoxyamide wax has a long carbon chain at one end and a strongly polar functional group at the other end. Because the matrix material is a non-polar material, according to the principle of opposite repulsion, it will migrate, diffuse, and accumulate on the substrate surface after 48 hours, thereby increasing the surface tension of the material. Moreover, the long carbon chain has good compatibility with the substrate resin, plays an anchoring role, and will not cause precipitation).

[0030] 2. The product has good mold release properties and does not precipitate, which will not affect the subsequent spraying (high molecular weight polysiloxane has the functions of internal and external lubrication, promoting filler dispersion, and improving product mold release properties. High molecular weight polysiloxane is solid, while low molecular weight polysiloxane is liquid. When added to the material, the alkyl groups in the high molecular weight polysiloxane form anchor points in the polypropylene material, which has a non-migration effect). Attached Figure Description

[0031] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0032] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0033] Comparative Example 1

[0034] See Figure 1This embodiment provides a functional masterbatch material for polypropylene, composed of the following raw materials in parts by weight: polysiloxane: 20 parts, treated silica: 20 parts, polypropylene resin: 10 parts, high-carbon chain ethoxyamide wax: 50 parts, and processing aid package: 0.5 parts. The polysiloxane has a molecular weight of 1000 and is a liquid. The treated silica is vinyltrimethoxysilane-treated silica, a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods. The polypropylene resin has an MFR of 10-20 g / 10 min. The high-carbon chain ethoxyamide wax is KF-027 from Zhejiang Jiahua Fine Chemicals Co., Ltd. The processing aid package contains antioxidants; hindered phenols and phosphite antioxidants are compounded in a 1:2 ratio. The hindered phenols include at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate, and N,N′-1,6-hexylene-bis[3,5-di-tert-butyl-4-hydroxyphenylpropionamide]. The phosphites include at least one of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol diphosphite bisoctadecyl ester, and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite ester.

[0035] The silica treated in this comparative example is vinyltrimethoxysilane-treated silica, a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods. It is added to a HAAKE torque rheometer along with polysiloxane, high-carbon-chain ethoxyamide wax, polypropylene resin, and an additive package for intensive mixing, followed by extrusion granulation to produce a masterbatch. The masterbatch is then physically mixed with existing bumper-specific polypropylene material (which exhibits mold sticking) (mixing pot, 240 RPM, 15 minutes), and then injection molded.

[0036] Comparative Example 2

[0037] See Figure 1This embodiment provides a functional masterbatch material for polypropylene, composed of the following raw materials in parts by weight: polysiloxane: 20 parts, untreated silica: 20 parts, polypropylene resin: 10 parts, high-carbon chain ethoxyamide wax: 50 parts, and processing aid package: 0.5 parts. The polysiloxane has a molecular weight of 1-1.2 million and is a solid. The untreated silica is a nano-scale material—silica (SiIII)—extracted from corn stalk ash after power generation through physical and chemical methods. The polypropylene resin has an MFR of 10-20 g / 10 min. The high-carbon chain ethoxyamide wax is KF-027 from Zhejiang Jiahua Fine Chemicals Co., Ltd. The processing aid package contains antioxidants; hindered phenols and phosphite antioxidants are compounded in a 1:2 ratio. The hindered phenols include at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate, and N,N′-1,6-hexylene-bis[3,5-di-tert-butyl-4-hydroxyphenylpropionamide]. The phosphites include at least one of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol diphosphite bisoctadecyl ester, and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite ester.

[0038] In this embodiment, the silica treated with vinyltrimethoxysilane is a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods. It is added to a HAAKE torque rheometer along with polysiloxane, high-carbon-chain ethoxyamide wax, polypropylene resin, and an additive package for intensive mixing, followed by extrusion granulation to produce a masterbatch. The masterbatch is then physically mixed with existing bumper-specific polypropylene material (which exhibits mold sticking) (mixing pot, 240 RPM, 15 minutes) and then injection molded.

[0039] Comparative Example 3

[0040] See Figure 1This embodiment provides a functional masterbatch material for polypropylene, composed of the following raw materials in parts by weight: polysiloxane: 20 parts, treated silica: 20 parts, polypropylene resin: 10 parts, low-chain ethoxyamide wax: 10 parts (liquid), high-chain ethoxyamide wax: 40 parts (solid), and processing aid package: 0.5 parts. The polysiloxane has a molecular weight of 1-1.2 million and is a solid. The treated silica is vinyltrimethoxysilane-treated silica, a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods. The polypropylene resin has an MFR of 10-20 g / 10 min. The low-chain ethoxyamide wax is commercially available, and the high-chain ethoxyamide wax is KF-027 from Zhejiang Jiahua Fine Chemicals Co., Ltd. The processing aid package contains antioxidants; hindered phenols and phosphite antioxidants are compounded in a 1:2 ratio. The hindered phenols include at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate, and N,N′-1,6-hexylene-bis[3,5-di-tert-butyl-4-hydroxyphenylpropionamide]. The phosphites include at least one of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol diphosphite bisoctadecyl ester, and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite ester.

[0041] In this embodiment, the silica treated with vinyltrimethoxysilane is a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods. It is added to a HAAKE torque rheometer along with polysiloxane, high-carbon-chain ethoxyamide wax, polypropylene resin, and an additive package for intensive mixing, followed by extrusion granulation to produce a masterbatch. The masterbatch is then physically mixed with existing bumper-specific polypropylene material (which exhibits mold sticking) (mixing pot, 240 RPM, 15 minutes) and then injection molded.

[0042] Example 1

[0043] See Figure 1This embodiment provides a functional masterbatch material for polypropylene, composed of the following raw materials in parts by weight: polysiloxane: 15 parts, treated silica: 25 parts, polypropylene resin: 35 parts, high-carbon chain ethoxyamide wax: 40 parts, and processing aid package: 0.5 parts. The polysiloxane has a molecular weight of 1-1.2 million and is a solid. The treated silica is vinyltrimethoxysilane-treated silica, a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods. The polypropylene resin has an MFR of 10-20 g / 10 min. The high-carbon chain ethoxyamide wax is KF-027 from Zhejiang Jiahua Fine Chemicals Co., Ltd. The processing aid package contains antioxidants; hindered phenols and phosphite antioxidants are compounded in a 1:2 ratio. The hindered phenols include at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate, and N,N′-1,6-hexylene-bis[3,5-di-tert-butyl-4-hydroxyphenylpropionamide]. The phosphites include at least one of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol diphosphite bisoctadecyl ester, and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite ester.

[0044] In this embodiment, the silica treated with vinyltrimethoxysilane is a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods. It is added to a HAAKE torque rheometer along with polysiloxane, high-carbon-chain ethoxyamide wax, polypropylene resin, and an additive package for intensive mixing, followed by extrusion granulation to produce a masterbatch. The masterbatch is then physically mixed with existing bumper-specific polypropylene material (which exhibits mold sticking) (mixing pot, 240 RPM, 15 minutes) and then injection molded.

[0045] Example 2

[0046] This embodiment provides a functional masterbatch material for polypropylene, which is composed of the following raw materials in parts by weight: polysiloxane: 20 parts, treated silica: 20 parts, polypropylene resin: 10 parts, high-carbon chain ethoxyamide wax: 50 parts, and processing aid package: 0.5 parts. The composition of the above raw materials in this embodiment is the same as that in Example 1.

[0047] Example 3

[0048] This embodiment provides a functional masterbatch material for polypropylene, which is composed of the following raw materials in parts by weight: polysiloxane: 23 parts, treated silica: 15 parts, polypropylene resin: 20 parts, high-carbon chain ethoxyamide wax: 30 parts, and processing aid package: 0.5 parts. The composition of the above raw materials in this embodiment is the same as that in Example 1.

[0049] By weighing the corresponding proportions of functional masterbatch materials from Comparative Examples 1-3 and Examples 1-3, and adding them to a HAAKE torque rheometer for internal mixing, extrusion granulation, and finally obtaining the functional masterbatch, the following proportions were obtained. The component ratios of Examples 1-3 and Comparative Examples 1-3 are shown in Table 1 (by weight):

[0050] Table 1

[0051]

[0052] The masterbatch in Table 1 above was added to the bumper-specific polypropylene material (which exhibits sticking to the mold) at a dosage of 2%. After thorough mixing, the same injection molding process was used to perform injection molding tests. The results are shown in Table 2 below.

[0053] Table 2

[0054]

[0055]

[0056] Note 1: Raw material refers to the part that has been injection molded but not yet painted;

[0057] 2. The base material refers to the polypropylene material specifically for bumpers.

[0058] Reference standards:

[0059] Tensile strength: GB / T1040.2-2022; Flexural strength: GB / T 9341-2008;

[0060] Notched impact strength of simply supported beams: GB / T1043.1-2008;

[0061] Surface precipitation: Prepare a 180x50 sample, experimental conditions 85℃, after 48 hours, place at room temperature, wear black latex gloves, press the sample, and observe whether the gloves contain white spots or oily substances.

[0062] Dyne pen line drawing test: Using a NewSitdun 38 Dyne pen from the United States, the line length is 20 mm. Observe whether the Dyne pen ink retracts.

[0063] Cross-cut test for colored paints and varnishes: GB / T9286-2021;

[0064] Cross-cut test after boiling: Boil in 100℃ deionized water for 4 hours, cool to room temperature, observe whether there are small bubbles on the surface of the sprayed part, and then conduct the cross-cut test according to the cross-cut test standards for colored paint and clear varnish.

[0065] Experiments 1, 2 and 3-8 show that adding 2% masterbatch has little effect on the tensile strength, flexural strength and notched impact strength of simply supported beams of the material.

[0066] Experiments 1, 2, and 6-8 show that polysiloxane can improve the release properties of polypropylene materials for bumpers.

[0067] Experiments 1 and 7 show that adding 2% masterbatch can achieve the same dyne value as flame-treated Experiment 1 without flame treatment, and the cross-cut test results after spraying and the cross-cut test results after boiling in water are better than those of Experiment 1.

[0068] Experiments 3-5 and 7 show that: polysiloxane with a molecular weight of 1000 exhibits precipitation, affecting the subsequent coating effect of the substrate material; untreated silica affects the overall notched impact strength of the simply supported beam of the material, and the lines drawn with a dyne pen will shrink slightly, resulting in a decrease in the coating effect; low-carbon chain ethoxyamide wax (liquid) will precipitate in the substrate material and affect the cross-cut coating test after boiling in water.

[0069] In conclusion, based on the above findings, treated silica, high-carbon chain ethoxyamide wax, and polysiloxanes with a molecular weight of 1-1.2 million can have a synergistic effect. Adding 2% masterbatch can improve the mold release properties and dyne value of the matrix material, and the spraying effect is better than that of flame-treated materials.

[0070] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A functional masterbatch material for polypropylene, characterized in that, The functional masterbatch material is composed of the following components in parts by weight: polysiloxane: 15-23 parts, treated silica: 15-25 parts, polypropylene resin: 10-35 parts, high carbon chain ethoxyamide wax: 30-50 parts, and processing aid package: 0.5 parts.

2. The functional masterbatch material for polypropylene according to claim 1, characterized in that, The functional masterbatch material is composed of the following components in parts by weight: polysiloxane: 20 parts, treated silica: 20 parts, polypropylene resin: 10 parts, high carbon chain ethoxyamide wax: 50 parts, and processing aid package: 0.5 parts.

3. The functional masterbatch material for polypropylene according to claim 1, characterized in that, The polysiloxane has a molecular weight of 1,000,000 to 1,200,000 and is a solid.

4. The functional masterbatch material for polypropylene according to claim 1, characterized in that, The treated silica is vinyltrimethoxysilane-treated silica, a nanoscale material extracted from corn stalk ash after power generation through physical and chemical methods.

5. The functional masterbatch material for polypropylene according to claim 1, characterized in that, The polypropylene resin is an MFR of 10-20 g / 10 min.

6. The functional masterbatch material for polypropylene according to claim 1, characterized in that, The high-carbon chain ethoxyamide wax is KF-027, a product manufactured by Zhejiang Jiahua Fine Chemicals Co., Ltd.

7. The functional masterbatch material for polypropylene according to claim 1, characterized in that, The processing aid package is an antioxidant; hindered phenols and phosphite antioxidants are compounded in a 1:2 ratio. The hindered phenols include at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl,4-hydroxyphenyl)propionate, and N,N′-1,6-hexylene-bis[3,5-di-tert-butyl-4-hydroxyphenylpropionamide]. The phosphites include at least one of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol diphosphite bisoctadecyl ester, and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite ester.

8. A method for preparing a functional masterbatch material for polypropylene, characterized in that, Includes the following steps: Corn stalk ash from power generation is ball-milled and then water-treated. Potassium hydroxide is prepared from the potassium oxide in the ash and water. The concentrated potassium hydroxide reacts with silica from a portion of the dry matter filtered out. After filtration, silica is prepared by reacting hydrochloric acid with potassium silicate. At this point, the silica is at the nanoscale and is then treated with vinyltrimethoxysilane coupling agent. Polysiloxane, treated silica, polypropylene resin, high-carbon chain ethoxyamide wax, and processing aid package are weighed according to the proportion and placed into a Hacker mixer. Then, the mixture is extruded and granulated to form functional masterbatch.

9. The method for preparing a functional masterbatch material for polypropylene according to claim 8, characterized in that, It also includes the following steps: Step A: Select corn stalk ash after power generation, grind it in a ball mill to prepare it into powder with a D50 of 55 microns; Step B: In a sealed container under a nitrogen atmosphere, add 3 times the volume of deionized water from Step A, stir at 50 RPM for 45 minutes to form a mixture; Step C: Open the valve and transport the mixture from Step B to the dry-wet separator via pipeline. Filter the mixture using a pressure filter. Set aside the filtered dry matter. Take a certain amount of the dry matter and react it with the silica in the dry matter using a 35% potassium hydroxide solvent (100℃, 50 RPM stirring, 6 hours). Calculate the silica content in the dry matter based on the amount of potassium hydroxide used. Store the filtered liquid and any insoluble particles in a sealed tank filled with atmospheric nitrogen. Open the tank valve and transport the mixture via pipeline to a vacuum filtration device for vacuum filtration at a vacuum degree of -0.06 MPa. The resulting solution is a potassium hydroxide aqueous solution (determined by acid-base titration and flame test). Add the potassium hydroxide solution to a sealed concentration tank filled with nitrogen at atmospheric pressure and concentrate the potassium hydroxide aqueous solution (by heating) to a concentration of 34%-36%. Step D: In a sealed container under a nitrogen atmosphere, calculate the mass of the dry matter filtered out in step C based on the amount of concentrate in step C, stir at 100°C and 50 RPM for 6 hours to obtain a mixture. Step E: Use a plate filter press (800 mesh filter cloth) to filter the mixture obtained in step D to obtain a turbid liquid. Add 3.5 times the volume of deionized water to the turbid liquid, stir at 50 RPM for 35 minutes, and then vacuum filter at a vacuum degree of -0.06 MPa to obtain a clear aqueous solution. Step F: Concentrate the clear aqueous solution obtained in step E (heat evaporation, stirring at 60 RPM) to a concentration of 25%-35%; Step G: Add emulsifier T-20 to the concentrate obtained in step F, adding 1.2% of the concentrate volume, and then add 18% hydrochloric acid. Control the overall pH value of the material at 7.7-8.6, stir at 274 RPM, 95℃-98℃ for 4 hours to obtain white sediment, and then vacuum filter at a vacuum degree of -0.06 MPa to obtain white silica SiⅠ. Step H: Rinse the silica SiⅠ obtained in step G with deionized water, adding 3.5 times the volume of deionized water each time, for a total of three rinses, each lasting 30 minutes with stirring at 120 RPM. For the first two rinses, only the deionized water on the top of the silica SiⅠ is drained. For the last rinse, vacuum filtration is required at a vacuum degree of -0.06 MPa to obtain white silica SiⅡ. Dry the white silica SiⅡ in a hollow chamber at 145℃ under a vacuum degree of -0.06 MPa to obtain white silica SiⅢ. Determine the particle size (using a laser particle size analyzer, with D90 at the nanometer level). Step I: Weigh the white silica III obtained in Step H and add it to a sealed reaction vessel. Dilute vinyltrimethoxysilane with anhydrous ethanol (75% content) and spray it into the reaction vessel. Spraying is completed in 5 minutes, and the spraying amount is 3.2% of the mass of white silica III. The container temperature is 95℃, and the mixture is stirred at 240 RPM for 140 minutes to form coarse silica. Wash the coarse silica with anhydrous ethanol, adding 3.5 times the volume of anhydrous ethanol each time, and wash three times. Stir at 120 RPM for 30 minutes each time. For the first two washes, the upper layer of silica liquid is directly discharged. For the last wash, vacuum filter is performed at a vacuum degree of -0.06 MPa. Then, vacuum dry at 145℃ at a vacuum degree of -0.06 MPa to obtain the treated silica. Step J: Weigh the treated silica, polysiloxane with a molecular weight of 1,000,000-1,200,000, polypropylene resin, high carbon chain ethoxyamide wax, and processing aids according to the specified mass, put them into the HAAKE torque rheometer, mix them thoroughly, and then granulate them by extrusion to finally obtain the functional masterbatch.

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