Mildew-proof antibacterial halogen-free flame-retardant PVC (polyvinyl chloride) composite material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of PVC (polyvinyl chloride) composite materials, and provides a mildew-proof antibacterial halogen-free flame-retardant PVC composite material as well as a preparation method and application thereof. The PVC composite material is prepared from the following raw materials in parts by mass: 20-70 parts of PVC resin, 10-60 parts of modified Mg (OH) 2 micro powder, 1-5 parts of a modified inorganic compound mildew-proof antibacterial agent, 1-2 parts of a plasticizer, 0.2-1 part of an antioxidant and 0.5-1 part of a stabilizer, the modified Mg (OH) 2 micro powder is prepared from Mg (OH) 2 micro powder, an interface modification compound agent and a lubricant; the modified inorganic compound mildew-proof antibacterial agent is prepared from an inorganic compound mildew-proof antibacterial agent and a surface modifier. By modifying the Mg (OH) 2 micro powder and the inorganic compound mildew-proof antibacterial agent, the dispersity of the inorganic compound mildew-proof antibacterial agent and Mg (OH) 2 in PVC resin is effectively improved, so that the mildew-proof antibacterial property and flame retardant property of the PVC composite material are improved.

Description

Technical Field

[0001] The invention relates to the technical field of PVC composite materials, and in particular to a mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material and a preparation method and application thereof. Background Art

[0002] With the development of the automobile industry, higher requirements are put forward for the safety, flame retardancy, functionality and comfort of automobile interior materials. The market demand for interior materials with halogen-free flame retardancy, high safety and mildew and antibacterial properties is increasing. PVC (polyvinyl chloride) is a material widely used in automobile interiors, with good wear resistance, chemical stability and cost-effectiveness. However, traditional PVC is a flammable material. When exposed to flames or high temperatures, it will burn rapidly and release a large amount of toxic smoke and gas. At the same time, PVC products are prone to mildew, produce odors and destroy the performance of products when exposed to bacterial environments for a long time, which greatly limits its application in the fields of automobile interior synthetic leather, seats, seat covers, door seals, window seals, panels, thermal insulation and sound insulation composite materials, and it is difficult to meet the needs of modern automobile interior materials. Therefore, it is of great significance to modify PVC, improve its flame retardancy and mildew and antibacterial properties, and use it to prepare automobile interior products that meet the requirements of flame retardancy, safety, environmental protection and mildew and antibacterial properties.

[0003] In recent years, among the many modification measures for PVC materials, PVC is often modified by adding organic small molecule flame retardants and antibacterial agents to achieve the purpose of flame retardancy and antibacterial properties of PVC material products. However, organic small molecule flame retardants have poor heat resistance, are easy to migrate, precipitate and decompose in products, and are harmful to human health. Moreover, long-term exposure of organic small molecule flame retardants and antibacterial agents to high temperature, humidity, light or oxidation conditions will also reduce the antibacterial and flame retardant effects of the products, and cannot meet the needs of long-term flame retardancy and mildew and antibacterial properties of automotive interior products. Based on this, inorganic compound mildew and antibacterial agents are antibacterial materials that combine multiple inorganic components, can effectively inhibit the growth of microorganisms and prevent the growth of mold, and have high temperature resistance, environmental friendliness, broad spectrum and long-lasting antibacterial properties. Magnesium hydroxide (Mg(OH)2) is a new type of halogen-free filled flame retardant. When thermally decomposed, it releases bound water and absorbs a large amount of latent heat to reduce the surface temperature of the material it fills in the flame. It has the function of inhibiting polymer decomposition and cooling the generated combustible gas, and is an excellent flame retardant. However, Mg(OH)2 and inorganic compound antifungal and antibacterial agents are easy to agglomerate in PVC, resulting in the reduction of the mechanical properties of the composite material, and even affecting the antifungal and antibacterial properties and flame retardant properties of the PVC composite material.

[0004] Therefore, there is an urgent need to provide a mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material to solve the problem of poor flame retardancy and mildew-proof and antibacterial properties of existing modified PVC composite materials. Summary of the invention

[0005] In view of this, the present invention provides a mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material and a preparation method and application thereof, so as to solve the problem that the existing modified PVC composite material has poor flame retardancy and mildew-proof and antibacterial properties.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The invention provides an anti-mildew, anti-bacterial, halogen-free flame-retardant PVC composite material, comprising the following components in parts by weight: 20 to 70 parts of PVC resin, 10 to 60 parts of modified Mg(OH)2 micropowder, 1 to 5 parts of modified inorganic compound anti-mildew and antibacterial agent, 1 to 2 parts of plasticizer, 0.2 to 1 part of antioxidant, and 0.5 to 1 part of stabilizer; the modified Mg(OH)2 micropowder is prepared from Mg(OH)2 micropowder, an interface modifying compound and a lubricant; the modified inorganic compound anti-mildew and antibacterial agent is prepared from an inorganic compound anti-mildew and antibacterial agent and a surface modifier.

[0008] Preferably, the preparation method of the modified Mg(OH)2 micropowder comprises the following steps: mixing Mg(OH)2 micropowder, an interface modification compound and a lubricant, and heating the mixture to obtain the modified Mg(OH)2 micropowder.

[0009] Preferably, the mass ratio of the Mg(OH)2 fine powder, the interface modification compound and the lubricant is 100:1-2.5:0.5-2.

[0010] Preferably, the interface modification compound includes two or more of silane coupling agent, isocyanate, titanate, stearic acid, oleic acid, sodium oleate and sodium dodecyl sulfonate; the lubricant includes one or more of N,N'-ethylene bisoleamide, N,N'-ethylene bisstearamide, PE wax and zinc stearate.

[0011] Preferably, the heating temperature during the preparation of the modified Mg(OH)2 micropowder is 70-110°C and the heating time is 6-15 minutes.

[0012] Preferably, the preparation method of the modified inorganic composite antifungal and antibacterial agent comprises the following steps: mixing the inorganic composite antifungal and antibacterial agent and the surface modifier, and heating the mixture to obtain the modified inorganic composite antifungal and antibacterial agent.

[0013] Preferably, the mass ratio of the inorganic composite antifungal and antibacterial agent to the surface modifier is 100:0.5-1.5.

[0014] Preferably, the inorganic composite antifungal and antibacterial agent includes two or more of nanosilver, silver oxide, copper oxide, cuprous oxide, copper sulfate, zinc oxide, zinc iodide, calcium phosphate, titanium dioxide, and tin dioxide; the surface modifier includes one or more of silane coupling agent, titanate, aluminate, zinc stearate, and PE wax.

[0015] Preferably, the heating temperature during the preparation of the modified inorganic composite antifungal and antibacterial agent is 60-100° C. and the heating time is 6-15 min.

[0016] Preferably, the plasticizer includes one or more of phthalates, fatty dibasic acid esters, phosphates, tribasic acid triesters, diol esters and polyesters; the antioxidant includes phosphite antioxidants and / or hindered phenol antioxidants; the stabilizer includes one or more of 3,5-di-tert-butyl-4-hydroxyphenylpropionate octadecyl, pentaerythritol tetrakis(4-hydroxy-3,5-di-tert-butylphenylpropionate), triphenyl phosphite, 2,6-tert-butyl-4-methylphenol and 2-hydroxy-4-methoxybenzophenone.

[0017] The present invention also provides a method for preparing a mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material, comprising the following steps: mixing PVC resin, modified Mg(OH)2 micropowder, modified inorganic compound mildew-proof and antibacterial agent, plasticizer, antioxidant and stabilizer, extruding and granulating to obtain a halogen-free flame-retardant PVC composite material.

[0018] Preferably, the temperature of the extrusion granulation is 110-165° C., the current is 100-160A, and the pressure is ≤10MPa.

[0019] The invention also provides a method for preparing a mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material, and application of the mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material in automobile interior decoration.

[0020] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention improves the interfacial compatibility of Mg(OH)2 micropowder and inorganic compound anti-mildew and anti-bacterial agent with PVC resin by modifying Mg(OH)2 micropowder and inorganic compound anti-mildew and anti-bacterial agent, forms a stable interfacial bonding force, effectively improves the dispersibility of inorganic compound anti-mildew and anti-bacterial agent and Mg(OH)2 micropowder in PVC resin, thereby improving the anti-mildew and anti-bacterial properties and flame retardant properties of anti-mildew and anti-bacterial halogen-free flame retardant PVC composite material. In addition, the anti-mildew and anti-bacterial halogen-free flame retardant PVC composite material of the present invention can also be widely used in the fields of automotive interior synthetic leather, seats, seat covers, door seals, window seals, panels, thermal insulation and sound insulation composite materials, greatly improving the flame retardancy and anti-mildew and anti-bacterial properties of automotive interior products, and having immeasurable economic and social benefits. DETAILED DESCRIPTION

[0022] The invention provides an anti-mildew, anti-bacterial, halogen-free flame-retardant PVC composite material, comprising the following components in parts by weight: 20 to 70 parts of PVC resin, 10 to 60 parts of modified Mg(OH)2 micropowder, 1 to 5 parts of modified inorganic compound anti-mildew and antibacterial agent, 1 to 2 parts of plasticizer, 0.2 to 1 part of antioxidant, and 0.5 to 1 part of stabilizer; the modified Mg(OH)2 micropowder is prepared from Mg(OH)2 micropowder, an interface modifying compound and a lubricant; the modified inorganic compound anti-mildew and antibacterial agent is prepared from an inorganic compound anti-mildew and antibacterial agent and a surface modifier.

[0023] In the present invention, the PVC resin is preferably 30-60 parts, more preferably 40-55 parts, more preferably 45 parts; the modified Mg(OH)2 powder is preferably 20-50 parts, more preferably 30-40 parts, more preferably 35 parts; the modified inorganic composite antifungal and antibacterial agent is preferably 1.5-4.5 parts, more preferably 2-4 parts, more preferably 2.5 parts; the plasticizer is preferably 1.2-1.8 parts, more preferably 1.4-1.6 parts, more preferably 1.5 parts; the antioxidant is preferably 0.3-0.8 parts, more preferably 0.4-0.6 parts, more preferably 0.5 parts; the stabilizer is preferably 0.6-0.9 parts, more preferably 0.7-0.8 parts, more preferably 0.75 parts.

[0024] In the present invention, the preparation method of the modified Mg(OH)2 micropowder comprises the following steps: mixing the Mg(OH)2 micropowder, an interface modification compounding agent and a lubricant, and heating the mixture to obtain the modified Mg(OH)2 micropowder.

[0025] In the present invention, the mass ratio of the Mg(OH)2 fine powder, the interface modification compound and the lubricant is 100:1-2.5:0.5-2, preferably 100:1.2-2:0.8-1.5, and more preferably 100:1.5-1.6:1-1.2.

[0026] In the present invention, the particle size of the Mg(OH)2 fine powder is preferably 400-6000 mesh, more preferably 1000-5000 mesh, and more preferably 2000-4000 mesh.

[0027] In the present invention, the interface modification compound includes two or more of silane coupling agent, isocyanate, titanate, stearic acid, oleic acid, sodium oleate and sodium dodecyl sulfonate; the lubricant includes one or more of N,N'-ethylene bisoleamide, N,N'-ethylene bisstearamide, PE wax and zinc stearate.

[0028] In the present invention, the stirring rate of the mixing during the preparation of the modified Mg(OH)2 fine powder is preferably 400-800 r / min, more preferably 500-700 r / min, and more preferably 600 r / min.

[0029] In the present invention, the heating temperature during the preparation of the modified Mg(OH)2 micropowder is 70-110°C, preferably 80-105°C, and more preferably 100°C; the heating time is 6-15 min, preferably 8-12 min, and more preferably 10 min.

[0030] In the present invention, the preparation method of the modified inorganic compound antifungal and antibacterial agent comprises the following steps: mixing the inorganic compound antifungal and antibacterial agent and the surface modifier, and heating the mixture to obtain the modified inorganic compound antifungal and antibacterial agent.

[0031] In the present invention, the mass ratio of the inorganic composite antifungal and antibacterial agent to the surface modifier is 100:0.5-1.5, preferably 100:0.7-1.2, and more preferably 100:0.8-1.

[0032] In the present invention, the inorganic composite antifungal and antibacterial agent includes two or more of nano silver, silver oxide, copper oxide, cuprous oxide, copper sulfate, zinc oxide, zinc iodide, calcium phosphate, titanium dioxide, and tin dioxide; the surface modifier includes one or more of silane coupling agent, titanate, aluminate, zinc stearate, and PE wax.

[0033] In the present invention, the stirring rate of the mixing during the preparation of the modified inorganic composite antifungal and antibacterial agent is preferably 400 to 800 r / min, more preferably 500 to 700 r / min, and more preferably 600 r / min.

[0034] In the present invention, the heating temperature during the preparation of the modified inorganic composite antifungal and antibacterial agent is 60-100°C, preferably 75-95°C, further preferably 80-90°C, more preferably 85°C; the heating time is 6-15min, preferably 8-13min, more preferably 11min.

[0035] In the present invention, the plasticizer includes one or more of phthalates, fatty dibasic acid esters, phosphates, tribasic acid triesters, diol esters and polyesters, wherein the phthalates preferably include dioctyl phthalate and / or dibutyl phthalate, the fatty dibasic acid esters include one or more of di(2-ethylhexyl) adipate, di(2-ethylhexyl) sebum, and dibutyl sebum, and the phosphates preferably include one or more of tricresyl phosphate, triphenyl phosphate, and tri(2-ethylhexyl) phosphate.

[0036] In the present invention, the antioxidant includes a phosphite antioxidant and / or a hindered phenol antioxidant, wherein the phosphite antioxidant preferably includes one or more of triphenyl phosphite, diisooctyl benzene phosphite, and dioctyl benzene phosphite; the hindered phenol antioxidant preferably includes one or more of 2,6-di-tert-butyl-4-methylphenol, tea polyphenols, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate octadecyl alcohol (antioxidant 1076), and 2,2'-methylenebis(4-methyl-6-tert-butylphenol) (antioxidant 2246).

[0037] In the present invention, the stabilizer includes one or more of 3,5-di-tert-butyl-4-hydroxyphenylpropionate, pentaerythritol tetrakis(4-hydroxy-3,5-di-tert-butylphenylpropionate), triphenyl phosphite, 2,6-tert-butyl-4-methylphenol and 2-hydroxy-4-methoxybenzophenone.

[0038] The present invention also provides a method for preparing the above-mentioned mildew-proof, antibacterial and halogen-free flame-retardant PVC composite material, comprising the following steps: mixing PVC resin, modified Mg(OH)2 micropowder, modified inorganic compound mildew-proof and antibacterial agent, plasticizer, antioxidant and stabilizer, extruding and granulating to obtain the halogen-free flame-retardant PVC composite material.

[0039] In the present invention, the temperature of the extrusion granulation is 110-165°C, preferably 120-160°C, more preferably 130-150°C, and more preferably 140°C; the current is 100-160A, preferably 110-150A, more preferably 120-140A, and more preferably 130A; the pressure is ≤10MPa, preferably 8-9MPa, more preferably 7-8MPa, and more preferably 6-7MPa.

[0040] In the present invention, the mixing time during the preparation of the mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material is preferably 8 to 30 minutes, more preferably 10 to 20 minutes, and more preferably 15 minutes, and the mixing stirring rate is preferably 400 to 800 r / min, more preferably 500 to 700 r / min, and more preferably 600 r / min.

[0041] The present invention also provides an application of the mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material prepared by the preparation method of the above-mentioned mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material in automobile interior decoration, wherein the automobile interior decoration includes one of synthetic leather, seats, seat covers, door sealing strips, window sealing strips, panels and heat-insulating and sound-insulating composite materials.

[0042] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0043] Example 1

[0044] Preparation of modified Mg(OH)2 micropowder: Dry 1 kg of Mg(OH)2 micropowder with a particle size of 2000-3000 mesh at 105°C for 2 hours for use, add the above-mentioned dried Mg(OH)2 micropowder, stearic acid, silane coupling agent KH570 and N,N'-ethylene bisstearamide in a mass ratio of 25:0.2:0.2:0.3 into a temperature-controlled high-speed mixer, react at a stirring rate of 600 r / min and a reaction temperature of 100°C for 15 minutes to obtain modified Mg(OH)2 micropowder.

[0045] Preparation of modified inorganic compound antifungal and antibacterial agent: Add 0.2 kg of inorganic compound antifungal and antibacterial agent (silver oxide and titanium dioxide in a mass ratio of 3:1) and 0.002 kg of silane coupling agent KH570 into a temperature-controlled high-speed mixer, react at a stirring rate of 600 r / min and a reaction temperature of 85°C for 11 minutes to obtain a modified inorganic compound antifungal and antibacterial agent.

[0046] Preparation of mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material: According to the mass parts, 55 parts of PVC resin, 3 parts of modified inorganic compound mildew-proof and antibacterial agent, 38 parts of modified Mg(OH)2 micropowder, 1.5 parts of dioctyl phthalate, 0.5 parts of diisooctyl phosphite and 1.0 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid octadecyl ester were weighed and added into a high-speed mixer, and stirred at a speed of 600r / min for 15 minutes to mix evenly, and then the evenly mixed materials were added into a twin-screw extruder, and extruded and granulated under the conditions of temperature of 160°C, current of 130A and pressure of 7MPa to obtain mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material.

[0047] Example 2

[0048] The modified Mg(OH)2 micropowder was prepared by the preparation method of modified Mg(OH)2 micropowder in Example 1.

[0049] Preparation of modified inorganic compound antifungal and antibacterial agent: Add 0.2 kg of inorganic compound antifungal and antibacterial agent (silver oxide and titanium dioxide in a mass ratio of 1:1) and 0.002 kg of silane coupling agent KH570 into a temperature-controlled high-speed mixer, react at a stirring rate of 600 r / min and a reaction temperature of 85°C for 11 minutes to obtain a modified inorganic compound antifungal and antibacterial agent.

[0050] Preparation of mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material: According to the mass parts, 55 parts of PVC resin, 3 parts of modified inorganic compound mildew-proof and antibacterial agent, 38 parts of modified Mg(OH)2 micropowder, 1.5 parts of dioctyl phthalate, 0.5 parts of diisooctyl phosphite and 1.0 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid octadecyl ester were weighed and added into a high-speed mixer, and stirred at a speed of 600r / min for 15 minutes to mix evenly, and then the evenly mixed materials were added into a twin-screw extruder, and extruded and granulated under the conditions of temperature of 160°C, current of 130A and pressure of 7MPa to obtain mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material.

[0051] Example 3

[0052] The modified Mg(OH)2 micropowder was prepared by the preparation method of modified Mg(OH)2 micropowder in Example 1.

[0053] Preparation of modified inorganic compound antifungal and antibacterial agent: Add 0.2 kg of inorganic compound antifungal and antibacterial agent (silver oxide and titanium dioxide in a mass ratio of 1:3) and 0.002 kg of silane coupling agent KH570 into a temperature-controlled high-speed mixer, react at a stirring rate of 600 r / min and a reaction temperature of 85°C for 11 minutes to obtain a modified inorganic compound antifungal and antibacterial agent.

[0054] Preparation of mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material: According to the mass parts, 55 parts of PVC resin, 3 parts of modified inorganic compound mildew-proof and antibacterial agent, 38 parts of modified Mg(OH)2 micropowder, 1.5 parts of dioctyl phthalate, 0.5 parts of diisooctyl phosphite and 1.0 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid octadecyl ester were weighed and added into a high-speed mixer, and stirred at a speed of 600r / min for 15 minutes to mix evenly, and then the evenly mixed materials were added into a twin-screw extruder, and extruded and granulated under the conditions of temperature of 160°C, current of 130A and pressure of 7MPa to obtain mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material.

[0055] Example 4

[0056] The only difference between Example 4 and Example 1 is that in the process of preparing the mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material, the PVC resin is 45 parts and the modified Mg(OH)2 powder is 48 parts.

[0057] Example 5

[0058] The only difference between Example 5 and Example 2 is that in the process of preparing the mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material, the PVC resin is 45 parts and the modified Mg(OH)2 powder is 48 parts.

[0059] Example 6

[0060] The only difference between Example 6 and Example 3 is that in the process of preparing the mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material, the PVC resin is 45 parts and the modified Mg(OH)2 powder is 48 parts.

[0061] Example 7

[0062] The only difference between Example 7 and Example 1 is that in the process of preparing the mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material, the PVC resin is 35 parts and the modified Mg(OH)2 powder is 58 parts.

[0063] Example 8

[0064] The only difference between Example 8 and Example 2 is that in the process of preparing the mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material, the PVC resin is 35 parts and the modified Mg(OH)2 powder is 58 parts.

[0065] Example 9

[0066] The only difference between Example 9 and Example 3 is that in the process of preparing the mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material, the PVC resin is 35 parts and the modified Mg(OH)2 powder is 58 parts.

[0067] Example 10

[0068] The only difference between Example 10 and Example 1 is that in the process of preparing the modified inorganic compound antifungal and antibacterial agent, the added amount of silane coupling agent KH570 is 0.0018 kg; in the process of preparing the antifungal and antibacterial halogen-free flame-retardant PVC composite material, the modified inorganic compound antifungal and antibacterial agent is 2 parts.

[0069] Embodiment 11

[0070] The only difference between this Example 11 and Example 2 is that: in the process of preparing the modified inorganic compound anti-mildew and antibacterial agent, the added amount of silane coupling agent KH570 is 0.0022 kg; in the process of preparing the anti-mildew and antibacterial halogen-free flame-retardant PVC composite material, the modified inorganic compound anti-mildew and antibacterial agent is 2 parts.

[0071] Example 12

[0072] The only difference between this Example 12 and Example 3 is that in the process of preparing the modified inorganic compound antifungal and antibacterial agent, the added amount of silane coupling agent KH570 is 0.0018 kg; in the process of preparing the antifungal and antibacterial halogen-free flame-retardant PVC composite material, the modified inorganic compound antifungal and antibacterial agent is 4 parts.

[0073] Embodiment 13

[0074] The only difference between Example 13 and Example 4 is that in the process of preparing the modified inorganic compound antifungal and antibacterial agent, the added amount of silane coupling agent KH570 is 0.0022 kg; in the process of preparing the antifungal and antibacterial halogen-free flame-retardant PVC composite material, the modified inorganic compound antifungal and antibacterial agent is 4 parts.

[0075] Embodiment 14

[0076] The only difference between Example 14 and Example 5 is that in the process of preparing modified Mg(OH)2 micropowder, the mass ratio of Mg(OH)2 micropowder to stearic acid, silane coupling agent KH570 and N,N'-ethylene bisstearamide is 100:0.8:0.7:1.2.

[0077] Embodiment 15

[0078] The only difference between Example 15 and Example 6 is that in the process of preparing modified Mg(OH)2 micropowder, the mass ratio of Mg(OH)2 micropowder to stearic acid, silane coupling agent KH570 and N,N'-ethylene bisstearamide is 100:0.8:0.9:1.2.

[0079] Example 16

[0080] The only difference between Example 16 and Example 7 is that in the process of preparing modified Mg(OH)2 micropowder, the mass ratio of Mg(OH)2 micropowder to stearic acid, silane coupling agent KH570 and N,N'-ethylene bisstearamide is 100:0.8:0.7:1.5.

[0081] Embodiment 17

[0082] The only difference between Example 17 and Example 8 is that in the process of preparing modified Mg(OH)2 micropowder, the mass ratio of Mg(OH)2 micropowder to stearic acid, silane coupling agent KH570 and N,N'-ethylene bisstearamide is 100:0.8:0.8:1.5.

[0083] Embodiment 18

[0084] The only difference between Example 18 and Example 9 is that in the process of preparing modified Mg(OH)2 micropowder, the mass ratio of Mg(OH)2 micropowder to stearic acid, silane coupling agent KH570 and N,N'-ethylene bisstearamide is 100:0.8:0.9:1.5.

[0085] Comparative Example 1

[0086] The only difference between Comparative Example 1 and Example 1 is that the inorganic composite mildew and antibacterial agent is not modified.

[0087] Comparative Example 2

[0088] The only difference between Comparative Example 2 and Example 1 is that the Mg(OH)2 powder is not modified.

[0089] 40 parts of the mildew-proof, antibacterial, halogen-free flame-retardant PVC composite materials prepared in the above Examples 1 to 18 and Comparative Examples 1 to 2 were taken respectively, and were mixed evenly with 60 parts of PVC respectively, and injection molded by an injection molding machine at 160°C to prepare standard specimens, and the standard specimens were subjected to performance tests. Antibacterial performance tests, mildew-proof performance tests, limiting oxygen index tests and vertical flame retardant performance tests were carried out according to national standards GB / T20944.3-2008, GB / T24346-2009, GB / T2046-1993 and UL-94V, and the test results are shown in Table 1 below.

[0090] Table 1 Performance test results of mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite materials

[0091]

[0092]

[0093] It can be seen from the test results in Table 1 that the unmodified Mg(OH)2 micropowder and inorganic compound mildew and antibacterial agent (silver oxide and titanium dioxide) in Comparative Examples 1 to 2 are not ideal for improving the mildew and antibacterial properties and flame retardant properties of PVC products. However, adding the Mg(OH)2 micropowder and inorganic compound mildew and antibacterial agent (silver oxide and titanium dioxide) modified by the method described in the present invention to PVC not only improves the mildew and antibacterial properties of PVC resin, but also effectively improves the flame retardant grade and limiting oxygen index of PVC resin, and also greatly reduces the cost of PVC products. This is because the Mg(OH)2 micropowder and inorganic compound mildew and antibacterial agent (silver oxide and titanium dioxide) modified by the method described in the present invention can be uniformly dispersed in PVC resin, greatly improving the interface compatibility between Mg(OH)2 micropowder and inorganic compound mildew and antibacterial agent (silver oxide and titanium dioxide) and PVC resin, and forming a stable interface bonding force.

[0094] In addition, by comparing the performance test results of the mildew-proof, antibacterial, halogen-free flame-retardant PVC composite materials obtained in Examples 1 to 18, it can be seen that different addition amounts of the interface modifier compounding agent will affect the improvement effect of the modified Mg(OH)2 micropowder on the mildew-proof, antibacterial and flame-retardant properties of PVC products, and different concentrations of the surface modifier will also affect the improvement effect of the modified inorganic compound mildew-proof and antibacterial agent on the mildew-proof, antibacterial and flame-retardant properties of PVC products. Among them, when the mass ratio of Mg(OH)2 micropowder to the interface modifier compounding agent (stearic acid and silane coupling agent KH570 in a mass ratio of 1:1) and the lubricant is 100:1.6:1.5, the obtained modified Mg(OH)2 micropowder has the best effect on improving the flame retardant properties of PVC products; when the mass ratio of the inorganic compound mildew-proof and antibacterial agent to the surface modifier is 100:1, the obtained modified inorganic compound mildew-proof and antibacterial agent has the best effect on improving the mildew-proof and antibacterial properties of PVC products.

[0095] The present invention compounds the modified inorganic compound anti-mildew and antibacterial agent and Mg(OH)2 micropowder with PVC resin, effectively improving the dispersibility of the inorganic compound anti-mildew and antibacterial agent and Mg(OH)2 in PVC resin, thereby improving the anti-mildew and antibacterial properties and flame retardant properties of the PVC composite material, and further improving the anti-mildew and antibacterial properties and flame retardant properties of PVC products made from the PVC composite material. The PVC composite material can be widely used in automotive interior synthetic leather, seats, seat covers, door sealing strips, window sealing strips, panels and thermal insulation and sound insulation composite materials.

[0096] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material, characterized in that: The composition includes the following components in parts by weight: 20-70 parts of PVC resin, 10-60 parts of modified Mg(OH)2 micropowder, 1-5 parts of modified inorganic compound antifungal and antibacterial agent, 1-2 parts of plasticizer, 0.2-1 parts of antioxidant, 0.5-1 parts of stabilizer; The modified Mg(OH)2 micropowder is prepared from Mg(OH)2 micropowder, an interface modification compounding agent and a lubricant; The modified inorganic compound anti-mildew and antibacterial agent is prepared from an inorganic compound anti-mildew and antibacterial agent and a surface modifier.

2. The mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material according to claim 1, characterized in that: The preparation method of the modified Mg(OH)2 micropowder comprises the following steps: Mg(OH)2 micropowder, interface modification compound and lubricant are mixed and heated to obtain modified Mg(OH)2 micropowder.

3. The mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material according to claim 2, characterized in that: The mass ratio of the Mg(OH)2 micropowder, the interface modification compound and the lubricant is 100:1-2.5:0.5-2; The interface modification compounding agent includes two or more of silane coupling agent, isocyanate, titanate, stearic acid, oleic acid, sodium oleate and sodium dodecyl sulfonate; The lubricant includes one or more of N,N'-ethylene bisoleamide, N,N'-ethylene bisstearamide, PE wax and zinc stearate; The heating temperature during the preparation of the modified Mg(OH)2 micropowder is 70-110°C and the heating time is 6-15 minutes.

4. The mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material according to claim 1, characterized in that: The preparation method of the modified inorganic composite mildew and antibacterial agent comprises the following steps: The inorganic compound antifungal and antibacterial agent and the surface modifier are mixed and heated to obtain a modified inorganic compound antifungal and antibacterial agent.

5. The mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material according to claim 4, characterized in that: The mass ratio of the inorganic compound antifungal and antibacterial agent to the surface modifier is 100:0.5-1.5; The inorganic compound mildew and antibacterial agent includes two or more of nano silver, silver oxide, copper oxide, cuprous oxide, copper sulfate, zinc oxide, zinc iodide, calcium phosphate, titanium dioxide, and tin dioxide; The surface modifier includes one or more of silane coupling agent, titanate, aluminate, zinc stearate and PE wax; The heating temperature during the preparation of the modified inorganic composite mildew and antibacterial agent is 60-100° C. and the heating time is 6-15 minutes.

6. The mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material according to any one of claims 1 to 5, characterized in that: The plasticizer includes one or more of phthalates, fatty dibasic acid esters, phosphate esters, tribasic acid triesters, diol esters and polyesters; The antioxidant includes phosphite antioxidant and / or hindered phenol antioxidant; The stabilizer includes one or more of 3,5-di-tert-butyl-4-hydroxyphenylpropionate octadecyl, pentaerythritol tetrakis(4-hydroxy-3,5-di-tert-butylphenylpropionate), triphenyl phosphite, 2,6-tert-butyl-4-methylphenol and 2-hydroxy-4-methoxybenzophenone.

7. The method for preparing a mildew-proof, antibacterial, halogen-free and flame-retardant PVC composite material according to any one of claims 1 to 6, characterized in that: The steps include: PVC resin, modified Mg(OH)2 micropowder, modified inorganic compound mildew and antibacterial agent, plasticizer, antioxidant and stabilizer are mixed, extruded and granulated to obtain halogen-free flame-retardant PVC composite material.

8. The method for preparing a mildew-proof, antibacterial, halogen-free, flame-retardant PVC composite material according to claim 7, characterized in that: The temperature of the extrusion granulation is 110-165° C., the current is 100-160A, and the pressure is ≤10MPa.

9. Use of the mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material prepared by the method for preparing the mildew-proof, antibacterial, halogen-free flame-retardant PVC composite material according to any one of claims 7 to 8 in automobile interior decoration.

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