Sealant with bacteriostatic and mildew-proof functions for metal bottle cap and preparation method of sealant

Abstract

The invention discloses a sealant with bacteriostatic and mildew-proof functions for a metal bottle cap and a preparation method of the sealant, and belongs to the technical field of sealant preparation. The sealant provided by the invention is prepared from the following raw material components in percentage by mass: 40.0 to 55.0 percent of an auxiliary agent A, 0.5 to 3.0 percent of an auxiliary agent B, 2.0 to 4.0 percent of zinc stearate, 1.0 to 3.0 percent of titanium dioxide, 1.0 to 5.0 percent of ground calcium carbonate, 0.5 to 2.5 percent of an anti-blocking agent and 39.0 to 55.0 percent of polyvinyl chloride resin, the auxiliary agent A is prepared from at least two of dioctyl terephthalate, epoxidized soybean oil, trimellitic anhydride and cyclohexane 1, 2-diisononyl diformate; the auxiliary agent B is obtained by mixing and grinding zinc oxide, metal silver, zirconium phosphate, zinc pyrithione and coconut oil fatty acid diacetamide. According to the invention, the sealant is prepared by compounding multi-component food-grade antibacterial mildew-proof active components, so that the prepared sealant is ensured to reach the first-grade standard of ASTM G21-15 Determination of Antifungal Factor of Synthetic High Polymer Materials, meanwhile, the risk that the sealant is mildewed when being used in canned food is reduced, and the quality of the product is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sealant preparation, and particularly relates to a sealant with antibacterial and mildew-proof functions for metal bottle caps and a preparation method thereof. BACKGROUND

[0002] Metal bottle caps are one of the main packaging materials for canned foods, and the annual usage is about 6 billion, and the types of filled foods are also very rich, such as condiment, poultry, fruit, fruit juice, and vegetable.

[0003] In recent years, customers, especially high-sugar canned customers, expect metal bottle caps to have mildew-proof functions. After investigation, it is found that there is slow mildew from the outside to the inside of the canned product prepared by the high-sugar canned customer, which further leads to quality risks of the canned product. Therefore, it is urgent to provide a sealant with antibacterial and mildew-proof functions for metal bottle caps of high-sugar canned products to alleviate the occurrence of such food safety risks. SUMMARY

[0004] In view of the deficiencies of the prior art, the application provides a sealant with antibacterial and mildew-proof functions for metal bottle caps and a preparation method thereof. The application uses a composite multi-component food-grade antibacterial and mildew-proof active ingredient to make a sealant for metal bottle caps, so as to ensure that the prepared sealant meets the ASTM G21-15 "Determination of the Fungus Resistance of Synthetic High Molecular Materials" first-level standard, eliminates the mildew of the sealant for canned metal bottle caps during storage, and further reduces the proportion of product mildew, and the heavy metal content meets the food contact material standard.

[0005] The technical scheme of the application is as follows: The application protects a sealant with antibacterial and mildew-proof functions in the first aspect, and the sealant comprises the following raw material components in percentage by mass: 40.0-55.0% of an additive A, 0.5-3.0% of an additive B, 2.0-4.0% of zinc stearate, 1.0-3.0% of titanium white, 1.0-5.0% of heavy calcium carbonate, 0.5-2.5% of an opening agent, and 39.0-55.0% of polyvinyl chloride resin. The additive A comprises at least two of dioctyl terephthalate, epoxy soybean oil, trimellitic anhydride, and diisononyl cyclohexane 1,2-dicarboxylate. The additive B is obtained by mixing and grinding zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diacetamide.

[0006] Preferably, the grinding speed is 30-80 r / min, and the time is 90-180 min.

[0007] Preferably, the mass ratio of the zinc oxide, the metallic silver, the zirconium phosphate, the zinc pyrithione, the coconut fatty acid diethanolamide is 0.3-1.0:1.5-2.5:0.3-1.0:0.8-1.5:2.5-6.0; Preferably, the mass ratio of the zinc oxide, the metallic silver, the zirconium phosphate, the zinc pyrithione, the coconut fatty acid diethanolamide is 0.5:2.0:0.5:1.0:3.5.

[0008] Preferably, the particle size of the auxiliary B is less than 45 μm.

[0009] Preferably, the particle size of the heavy calcium carbonate is 5-10 μm. The opening agent comprises (Z)-9-octadecenoic acid amide.

[0010] Preferably, the polyvinyl chloride resin is polyvinyl chloride resin powder. The polyvinyl chloride resin powder is purchased from Vinolit Company, and the model is P80 or P70.

[0011] Preferably, the coconut fatty acid diethanolamide is purchased from Nantong Gaokai Chemical Co., Ltd.

[0012] The second aspect of the present application protects a preparation method of the sealant of the above-mentioned first aspect, and the preparation method comprises the following steps, in terms of mass percentage: S1: stirring and mixing the auxiliary A, the auxiliary B, the zinc stearate and the titanium white powder; S2: adding the heavy calcium carbonate and the opening agent, and stirring and mixing; S3: further adding the polyvinyl chloride resin, stirring, vacuumizing, standing, filtering, and obtaining the sealant.

[0013] 9. The preparation method according to claim 8, wherein in step S1, the stirring speed is 500-600 r / min, and the stirring time is 55-65 min. In step S2, the stirring speed is 400-800 r / min, and the stirring time is 25-35 min.

[0014] Preferably, in step S3, the stirring temperature is 30-60 ℃, the stirring speed is 600-1400 r / min, and the stirring time is 60-90 min. The vacuumizing refers to vacuumizing to a vacuum value of 8-10 bar, and the standing time is 15-20 min.

[0015] The present application has the beneficial technical effects of: The present application is prepared by composite multi-component food-grade bacteriostatic and mildew-proof active ingredients, which ensures that the prepared sealant reaches the first level standard of ASTM G21-15 "Determination of the Fungus Resistance of Synthetic Polymer Materials", and reduces the risk of mildew in the sealant used in canned food, and improves the quality of the product. In the additive A, dioctyl terephthalate can soften the polyvinyl chloride resin, the epoxy soybean oil has good heat resistance, trimellitic anhydride has excellent cold resistance, and the two synergistically improve the environmental stability of the product in storage, and diisononyl cyclohexane 1,2-dicarboxylate has good compatibility with polyvinyl chloride, which can adjust the viscosity of the sealant and facilitate construction. In the additive B, zinc oxide is an auxiliary bacteriostatic substance, and also has a heat stability effect, which can relieve the yellowing of the sealant during subsequent high-temperature curing, and silver and zirconium phosphate both have broad-spectrum bacteriostatic effect, and pyrithione zinc has mildew-proof effect, and the reasonable combination of multiple bacteriostatic and mildew-proof components can not only meet the requirements of food contact material regulations, but also provide reliable bacteriostatic and mildew-proof properties; coconut oil fatty acid diacetamide can improve the agglomeration of the ground powder. The above raw materials are premixed and ground to obtain additive B, and then added to the raw materials, which can provide a stable bacteriostatic and mildew-proof additive; the heavy calcium carbonate used can increase the mechanical strength of the product, and the opening agent is used for demolding and reducing the separation torque of the contact part. The sealant prepared by the synergistic action of the components not only provides good can sealing, but also provides unique bacteriostatic and mildew-proof properties, filling the gap of food-grade bacteriostatic and mildew-proof sealant for metal bottle caps. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Comparison chart of the mildew-proof test of the sealant prepared in Example 1 and Comparative Example 2 of the present application.

[0017] In the figure: a, is the chart of the sealant of Comparative Example 2 after the mildew-proof test; b, is the chart of the sealant of Example 1 after the mildew-proof test. DETAILED DESCRIPTION

[0018] The present application will be specifically described below in combination with the drawings and examples.

[0019] In view of the problems of the existing bottle cap sealant, the present application first provides a metal bottle cap sealant with bacteriostatic and mildew-proof function.

[0020] The application provides a bacteriostatic and mildew-proof sealant, which comprises the following raw material components in percentage by mass: 40.0-55.0% of an auxiliary A, 0.5-3.0% of an auxiliary B, 2.0-4.0% of zinc stearate, 1.0-3.0% of titanium white, 1.0-5.0% of heavy calcium carbonate, 0.5-2.5% of an opening agent, and 39.0-55.0% of polyvinyl chloride resin. The auxiliary A comprises at least two of dioctyl terephthalate, epoxy soybean oil, trimellitic anhydride and diisononyl cyclohexane-1,2-dicarboxylate; and the auxiliary B is obtained by mixing and grinding zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione and coconut fatty acid diacetamide.

[0021] It can be understood that the sealant is prepared by using the composite multi-component food-grade bacteriostatic and mildew-proof active ingredient, so that the prepared sealant meets the first-level standard of ASTM G21-15 'Determination of Fungus Resistance of Synthetic High Polymer Materials', the risk of mildew of the sealant used in canned food is reduced, and the product quality is improved. In particular, the multi-component auxiliary A improves the heat resistance and cold resistance, improves the compatibility with polyvinyl chloride, softens the polyvinyl chloride, adjusts the viscosity of the sealant, and reduces the construction difficulty; the multi-component auxiliary B reasonably matches various bacteriostatic and mildew-proof components, meets the requirements of the food contact material regulations, provides reliable bacteriostatic and mildew-proof properties, further improves the agglomeration problem of the ground powder by using coconut fatty acid diacetamide, and improves the bacteriostatic and mildew-proof properties of the auxiliary B while improving the stability.

[0022] In some embodiments, the auxiliary B is obtained by mixing and grinding zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione and coconut fatty acid diacetamide; the grinding ball used for grinding is preferably a steel ball, and the ratio of the material to the ball is preferably 1:2; the grinding speed is 30-80 r / min, and the grinding time is 90-180 min.

[0023] In the application, the auxiliary A is composed of at least two of dioctyl terephthalate, epoxy soybean oil, trimellitic anhydride and diisononyl cyclohexane-1,2-dicarboxylate. The dioctyl terephthalate has the function of softening polyvinyl chloride resin, the epoxy soybean oil has good heat resistance, the trimellitic anhydride has excellent cold resistance, and the diisononyl cyclohexane-1,2-dicarboxylate has good compatibility with polyvinyl chloride.

[0024] The application does not limit the epoxy soybean oil, and any raw material that can achieve the effect of the application is within the protection scope of the application. Preferably, the epoxy value of the epoxy soybean oil is 6.0%-8.0%.

[0025] In the present application, the auxiliary agent B is prepared by grinding zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diethanolamide. In the above components, the zinc oxide serves as an auxiliary bacteriostatic substance and has a thermal stability effect, the metallic silver and the zirconium phosphate have a broad-spectrum bacteriostatic effect, the zinc pyrithione has a mildew-proof effect, and the coconut fatty acid diethanolamide has an effect of improving the agglomeration of the ground powder.

[0026] In some embodiments, the mass ratio of the zinc oxide, the metallic silver, the zirconium phosphate, the zinc pyrithione, the coconut fatty acid diethanolamide is 0.3-1.0:1.5-2.5:0.3-1.0:0.8-1.5:2.5-6.0. In some embodiments, the mass ratio of the zinc oxide, the metallic silver, the zirconium phosphate, the zinc pyrithione, the coconut fatty acid diethanolamide is 0.5:2.0:0.5:1.0:3.5.

[0027] In some embodiments, the particle size of the auxiliary agent B is less than 45 μm.

[0028] In the present application, the zinc stearate has an effect of inhibiting the thermal decomposition of the polyvinyl chloride, the titanium white is used to make the product white, the heavy calcium carbonate has an effect of increasing the mechanical strength of the product, the (Z)-9-octadecenoic acid amide is used for demolding and improving the disengagement torque of the contact part. The polyvinyl chloride resin powder provides a basic substrate effect.

[0029] In some embodiments, the particle size of the heavy calcium carbonate is 5-10 μm; the present application does not limit other parameters of the heavy calcium carbonate, and any raw material that can achieve the effect of the present application is within the protection scope of the present application.

[0030] In some embodiments, the opening agent includes (Z)-9-octadecenoic acid amide.

[0031] In some embodiments, the polyvinyl chloride resin is a polyvinyl chloride resin powder. In some embodiments, the polyvinyl chloride resin powder is purchased from Vinolit Company, and the model number is P80 or P70.

[0032] In some embodiments, the coconut fatty acid diethanolamide, English name Coconutt Diethanol Amide, is abbreviated as CDEA, which is purchased from Nantong Gaokai Chemical Co., Ltd.

[0033] The present application provides a preparation method of the sealant in the first aspect. S1: stirring and mixing the auxiliary agent A, the auxiliary agent B, the zinc stearate, and the titanium white; S2: adding the heavy calcium carbonate, the opening agent, stirring and mixing; S3: adding the polyvinyl chloride resin again, stirring, vacuumizing, standing, filtering, and obtaining the sealant.

[0034] In some embodiments, in step S1, the stirring speed is 500-600 r / min, and the stirring time is 55-65 min.

[0035] In some embodiments, in step S2, the stirring speed is 400-800 r / min, and the stirring time is 25-35 min.

[0036] In some embodiments, in step S3, the stirring temperature is 30-60℃, the stirring speed is 600-1400 r / min, and the stirring time is 60-90 min.

[0037] In some embodiments, the vacuumizing is vacuumizing to a vacuum value of 8-10 bar, and the standing time is 15-20 min.

[0038] The materials used in the application are selected from the materials authorized in Chinese GB9685, GB2760 and the FDA list in the United States, and meet the legal and regulatory requirements of food contact materials; the sealant paste prepared can withstand high temperature baking of 260℃ or below; after high temperature baking at 180℃-220℃, the piece is detected by the method of GB / T24128 "Plastic Antifungal Performance Test Method" or ASTM G21-15 "Synthetic High Polymer Material Antifungal Property Test Method", and the antibacterial and mold-proof reaches the 1st level standard, and the antibacterial and mold-proof rate reaches 99.5% or above.

[0039] The application will be further described below through examples.

[0040] Example 1 A sealant, by mass percentage, comprises the following raw material components: 40% of an additive A, 1.0% of an additive B, 2.0% of zinc stearate, 1.0% of pigment white, 1.0% of heavy calcium carbonate, 0.5% of (Z)-9-octadecene amide, and 54.5% of polyvinyl chloride resin powder.

[0041] The additive B is prepared by mixing zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diacetamide in a mass ratio of 0.5:2.0:0.5:1.0:3.5, and then grinding at 80 r / min for 120 min to obtain an average particle size of 35 μm.

[0042] The auxiliary A is obtained by mixing dioctyl terephthalate, epoxy soybean oil and diisononyl cyclohexane 1,2-dicarboxylate at a mass ratio of 2:1:2. The epoxy value of the epoxy soybean oil is 6.0%.

[0043] A preparation method of a sealant, comprising the following steps of adding the above-mentioned raw materials in the following mass percentages: First step: auxiliary A, auxiliary B, zinc stearate, and pigment white are weighed and added into a high-speed disperser, and stirred at a speed of 550 rpm for 60 minutes at room temperature. Second step: after the heavy calcium carbonate and (Z)-9-octadecenamide are weighed, they are added into the slurry of the first step, and stirred at a speed of 600 rpm for 30 minutes at room temperature.

[0044] Third step: the PVC resin powder is weighed and added into the slurry of the second step, and stirred at a speed of 1000 rpm for 75 minutes, while the process temperature is controlled at 45°C, and a vacuum device is started to ensure that the vacuum value in the disperser reaches 9 bar.

[0045] Fourth step: the slurry obtained in the third step is filtered through a 80-mesh filter screen after being left for 18 minutes, to obtain the antibacterial and mildew-proof sealant.

[0046] Example 2 The example is basically the same as example 1, except that the mass ratio of the components in the auxiliary B is changed. In this example, the mass ratio of zinc oxide, silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diacetamide is 0.3:1.5:0.3:0.8:2.5.

[0047] Example 3 The example is basically the same as example 1, except that the amount of the auxiliary B is changed. In the sealant, the raw materials include 40% auxiliary A, 0.5% auxiliary B, 2.0% zinc stearate, 1.0% pigment white, 1.0% heavy calcium carbonate, 0.5% (Z)-9-octadecenamide, and 55.0% PVC resin powder.

[0048] Example 4 The example is basically the same as example 1, except that the amount of the auxiliary B is changed. In the sealant, the raw materials include 40% auxiliary A, 3.0% auxiliary B, 2.0% zinc stearate, 1.0% pigment white, 1.0% heavy calcium carbonate, 0.5% (Z)-9-octadecenamide, and 52.50% PVC resin powder.

[0049] Example 5 The same as example 1, except that the grinding conditions of the auxiliary B are changed, the particle size after grinding is different, and the auxiliary B is prepared according to the mass ratio of zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diacetamide 0.5:2.0:0.5:1.0:3.5. After mixing zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diacetamide, grinding at 30 r / min for 90 min, the average particle size is 43 μm.

[0050] Comparative example 1 The same as example 5, except that the ratio of each component of auxiliary B is not within the specified range. In this comparative example, auxiliary B is prepared according to the mass ratio of zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diacetamide 1.0:5.0:1.5:0.8:3.5. After mixing zinc oxide, metallic silver, zirconium phosphate, and zinc pyrithione, grinding at 30 r / min for 90 min, the average particle size is 44 μm.

[0051] Comparative example 2 The same as example 5, except that the types of components in auxiliary B are reduced. Auxiliary B is prepared according to the mass ratio of zinc oxide, zirconium phosphate, and zinc pyrithione 0.5:0.5:1.0. After mixing zinc oxide, zirconium phosphate, and zinc pyrithione, grinding at 30 r / min for 90 min, the average particle size is 42 μm.

[0052] Comparative example 3 The same as example 1, except that component B is not added, and the amount of polyvinyl chloride resin powder is adjusted to 55.5%.

[0053] Comparative example 4 The same as example 1, except that the ratio of each component is changed, including 45.0% auxiliary A, 3.0% auxiliary B, 4.0% zinc stearate, 3.0% pigment white, 5.0% heavy calcium carbonate, 2.5% (Z)-9-octadecenamide, and 37.5% polyvinyl chloride resin powder.

[0054] Comparative example 5 The same as example 1, except that the components in auxiliary B are directly mixed without grinding, and the mixture is directly added as raw material after mixing.

[0055] Test example: The sealant prepared in the examples and comparative examples of the present application is tested for viscosity at 25°C using a NDJ-1 type rotary viscometer; at the same time, a 63RTO cap is opened, the appearance is observed visually, and the sealing performance, adhesion, and gasket strength under the condition of heating in 121°C water at 0.21 MPa pressure for 30 minutes are tested according to GB / T 29335-2024 "General Quality of Claw Type Cap for Food Containers" clause 6.6, and the results are shown in Table 1.

[0056] The preparation method of the 63RTO screw-on cap is as follows: the sealant prepared in each example and the comparative example is uniformly injected into a pre-prepared screw-on cap empty cover (thickness 2 mm) without sealant, and cured at 210 DEG C for 3 min to obtain a 63RTO screw-on cap containing a sealing gasket, and used for the above detection.

[0057] Table 1 Performance test of sealant and corresponding product of examples and comparative examples

[0058] As can be seen from Table 1, the viscosity of the sealant prepared in the examples of the application at 25 DEG C is suitable, which can better meet the construction requirements of the screw-on cap. At the same time, the antibacterial and mildew-proof sealant prepared by the method of the application has a good product appearance without bubbles, particles and other abnormalities. And the sealing performance is excellent, the screw-on cap made of the antibacterial and mildew-proof sealant has stable vacuum value, qualified sealing gasket strength, and good adhesion between the antibacterial and mildew-proof sealant and the coating according to the method of GB / T29335-2024.

[0059] For the key antibacterial and mildew-proof performance, five common molds, i.e. Aspergillus brasiliensis (formerly known as Aspergillus niger), Penicillium funiculosum (formerly known as Penicillium pinophilum), Chaetomium globosum, Trichoderma viride (formerly known as Gliocladium virens), and Blastococcus tenellus, were selected to test the antibacterial and mildew-proof performance of the prepared sealant according to ASTM G21-15 "Determination of the Resistance of Synthetic High Polymer Materials to Fungi". At the same time, the heavy metal index was detected according to GB4806.7-2023 "National Food Safety Standard Plastic Materials and Products for Food Contact". The results are shown in Table 2 below.

[0060] Among them, according to the ASTM G21 evaluation standard, 50 times microscopic observation: no growth is 0 level; trace growth (less than 10%) is level 1; slight growth (greater than or equal to 10% and less than 30%) is level 2; moderate growth (greater than or equal to 30% and less than 60%) is level 3; severe growth (greater than or equal to 60%-full coverage) is level 4; 0 level is the best, level 1 is the second, and levels 2-4 are unqualified products. According to the national standard GB4806.7-2023: the heavy metal in 4% acetic acid is less than or equal to 1 mg / kg for qualified products, and the heavy metal in 4% acetic acid is greater than 1 mg / kg for unqualified products.

[0061] Table 2 Antibacterial and mildew-proof performance and heavy metal test of examples and comparative examples

[0062] As can be seen from Table 2, the product prepared from the sealant prepared in the examples of the application has good antibacterial and mildew-proof performance, and the heavy metal meets the standard.

[0063] Figure 1The pictures of the antibacterial and mildewproof of the sealant of Example 1 and Comparative Example 2, which is cured at 210 DEG C for 3 min, are observed according to the method of ASTM G21-15 "Determination of the Fungus Resistance of Synthetic Polymeric Materials". As shown in the pictures, the sealability of Comparative Example 2 has obvious mildew spots, and the sealability of Example 1 has no mildew spots.

[0064] The above results show that the sealant prepared in the example of the present application not only provides good construction viscosity and sealing performance, but also meets the national standard of food contact materials, and provides excellent antibacterial and mildewproof performance.

[0065] The above only describes the preferred embodiments of the present application, and the present application is not limited to the above examples. It can be understood that other improvements and changes directly derived or thought by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the protection scope of the present application.

Claims

1. A bacteriostatic and mildewcrobatic sealant, characterized by, The sealant comprises the following raw material components in percentage by mass: 40.0-55.0% of the auxiliary A, 0.5-3.0% of the auxiliary B, 2.0-4.0% of zinc stearate, 1.0-3.0% of titanium white, 1.0-5.0% of heavy calcium carbonate, 0.5-2.5% of an opening agent, and 39.0-55.0% of polyvinyl chloride resin; The auxiliary A comprises at least two of dioctyl terephthalate, epoxy soybean oil, trimellitic anhydride, and diisononyl cyclohexane-1,2-dicarboxylate. The auxiliary B is obtained by mixing and grinding zinc oxide, metallic silver, zirconium phosphate, zinc pyrithione, and coconut fatty acid diacetamide.

2. The sealant of claim 1, wherein The grinding speed is 30-80 r / min, and the time is 90-180 min.

3. The sealant of claim 1, wherein The mass ratio of the zinc oxide, the metallic silver, the zirconium phosphate, the zinc pyrithione, and the coconut fatty acid diacetamide is 0.3-1.0:1.5-2.5:0.3-1.0:0.8-1.5:2.5-6.

0. Preferably, the mass ratio of the zinc oxide, the metallic silver, the zirconium phosphate, the zinc pyrithione, and the coconut fatty acid diacetamide is 0.5:2.0:0.5:1.0:3.

5.

4. The sealant of claim 1, wherein The particle size of the auxiliary B is less than 45 μm.

5. The sealant of claim 1, wherein The particle size of the heavy calcium carbonate is 5-10 μm. The opening agent comprises (Z)-9-octadecenamide.

6. The sealant of claim 1, wherein The polyvinyl chloride resin is polyvinyl chloride resin powder. The polyvinyl chloride resin powder is purchased from Vinolit Company, and the model number is P80 or P70.

7. The sealant of claim 1, wherein The coconut fatty acid diacetamide is purchased from Nantong Gaokai Chemical Co., Ltd.

8. A process for the preparation of the sealant according to any one of claims 1 to 7, characterized in that, The preparation method comprises the following steps in percentage by mass: S1: stirring and mixing the auxiliary A, the auxiliary B, the zinc stearate, and the titanium white; S2: adding the heavy calcium carbonate and the opening agent, and stirring and mixing; S3: adding the polyvinyl chloride resin, stirring, vacuumizing, standing, filtering, and obtaining the sealant.

9. The production method according to claim 8, characterized by, In step S1, the stirring speed is 500-600 r / min, and the time is 55-65 min. In step S2, the stirring speed is 400-800 r / min, and the time is 25-35 min.

10. The preparation method according to claim 8, characterized in that, In step S3, the stirring temperature is 30-60 °C, the speed is 600-1400 r / min, and the time is 60-90 min. The vacuumizing refers to vacuumizing to a vacuum value of 8-10 bar, and the standing time is 15-20 min.

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