PVC modified resin composition, PVC modified resin and preparation method and application thereof

Abstract

The invention relates to the field of high polymer materials, in particular to a PVC (polyvinyl chloride) modified resin composition, PVC modified resin as well as a preparation method and application thereof. According to the PVC modified resin provided by the invention, MBS and / or CPE are / is used as a flexibilizer of PVC, and the tensile elongation at break and impact strength of PVC are effectively improved by using an orthophthalic plasticizer, so that the defect of serious brittleness of PVC is overcome, and the PVC modified resin is suitable for various processing requirements; the surface resistance of the PVC modified resin is obviously reduced by combining conductive carbon black, and the flame retardant property is improved by combining antimony trioxide. The PVC modified resin provided by the invention is simple in blending modification preparation process and wide in application field as a PVC modified resin product, and various PVC series products, such as mine pipelines, plates or injection molding plastic parts, which can meet the requirements of different purposes can be obtained by regulating and controlling the formula.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, in particular to a PVC modified resin composition, a PVC modified resin, and a preparation method and application thereof. Background Art

[0002] Polyvinyl chloride (PVC), one of the five most common plastics, is inexpensive and has high mechanical strength, making it widely used in the manufacture of plastic pipes. However, its toughness is poor and it is prone to cracking. PVC pipes used underground in coal mines need to be flame-retardant and antistatic, while also maintaining excellent impact strength. Antistatic and flame-retardant rigid PVC pipes (referred to as PVC dual-resistance pipes) offer corrosion resistance, low density, excellent flame retardancy, high pressure resistance, and low cost. They are used in coal mines for gas extraction and drainage. Elastomers CPE, ACR, MBS, and NBR are widely used to toughen and modify PVC. Common flame retardants for PVC include halogen-based, halogen-free, organophosphorus-based, and halogen-phosphorus-based flame retardants, with halogen-free flame retardants currently being the primary research focus. Conductive carbon black is typically added to achieve antistatic properties. With the country's increasing emphasis on coal mine gas control, the development of antistatic and flame-retardant PVC-U pipes can play a positive role in reducing coal mine fire incidents. Market demand is high, and their significance is significant.

[0003] PVC toughening modification can be divided into elastomer toughening and rigid particle toughening. Elastomer toughening primarily involves blending PVC with materials such as CPE, ACR, MBS, and NBR, effectively improving its impact strength. Rigid particles are categorized as organic and inorganic. The former primarily includes PMMA and SAN, but their relatively high price limits their application. The latter primarily uses fillers such as calcium carbonate and silica. These inorganic rigid particles can improve PVC's impact resistance, as well as its tensile strength, modulus, and heat resistance.

[0004] Foreign countries started research on PVC toughening agents earlier than my country, especially MBS from Japan's Kanebuchi Corporation and Kureha Corporation, and ACR from the United States' Rohm & Haas Company. They are the most representative and are used for PVC impact modification. Their toughening effect is ahead of similar products in my country.

[0005] International companies have conducted extensive research on the toughening and modification of PVC. Toughening agents are primarily core-shell toughening agents. By varying the core-shell composition ratio and adjusting the degree of polymerization to target different PVC applications, different types of MBS and ACR have been developed. The core copolymer composition has been varied, such as ASA, with a styrene-acrylonitrile copolymer as the core and a polymethyl methacrylate shell, and MB, with a polybutadiene core and a polymethyl methacrylate shell. Research on MBS synthesis has manipulated various factors, including styrene-butadiene latex particle size, initiator, emulsifier, and molecular weight regulator, to examine their effects on MBS grafting efficiency, conversion rate, and molecular weight. MBS with varying structural properties has been prepared by varying the initiation system and monomer addition method for emulsion polymerization, and the resulting toughening effects of MBS with different internal structures on PVC resin have been investigated.

[0006] Research on PVC toughening agents primarily focuses on MBS from Kane Ace (Japan), with representative grades B-564, B521, B625, M701, M722, M724, and M732. These products have a soft-core, hard-shell structure with a butadiene-styrene copolymer core and a polymethyl methacrylate shell. Representative MBS grades from Kureha (Japan) include BTA-717, BTA-723, BTA-731, BTA-740, and BTA-751, which are used in various applications. ACR, a PVC toughening agent from Rohm & Haas (USA), has a soft-core, hard-shell structure with a polybutyl acrylate core and a polymethyl methacrylate shell. Its representative grade is KM-355P. There are also ACR processing aids, which feature a soft-core, hard-shell structure consisting of a polyethyl acrylate core and a polymethyl methacrylate shell. Representative models K-175 and K-175P offer excellent compatibility with ACR impact modifiers, improving the melt index of PVC and facilitating the processing and molding of PVC pipes. South Africa uses chlorinated polyethylene (CPE) as a toughening agent, the UK uses CPE and acrylic acid derivatives, and Taiwan often uses acrylic resins. PVC flame retardancy is primarily researched for cables, with less focus on pipes. Bromine-based and phosphorus-based flame retardants, as well as inorganic magnesium hydroxide, aluminum hydroxide, and antimony trioxide, are the main areas of research. There is also considerable research on blended organic and inorganic flame retardants. China boasts numerous flame retardant R&D teams. Academician Wang Yuzhong of Sichuan University has researched a variety of flame retardants for flame retardant modification of various polymers. The flame retardant field focuses on synthesizing new flame retardants to reduce the amount of flame retardants used and achieve superior flame retardancy. In the field of antistatic agents, carbon black is the best choice for conductive materials. This is mainly achieved by modifying carbon black to improve its dispersion in PVC.

[0007] In summary, to address the serious drawback of PVC's brittleness, modification research is actively underway both domestically and internationally, with multi-component blending and modification being the primary approach to improving PVC's toughness. However, the production of high-toughness, flame-retardant, and antistatic PVC pipes requires the integration of three modification methods: low-temperature toughening, flame retardancy, and antistatic properties. Flame retardant modification generally reduces impact strength, and the synergistic effects of these three additives, balancing performance and price to achieve the optimal cost-effectiveness while meeting the extrusion process requirements of the production line, present a significant technical challenge. Summary of the Invention

[0008] In view of this, the technical problem to be solved by the present invention is to provide a PVC modified resin composition, a PVC modified resin and a preparation method and application thereof. The PVC modified resin provided by the present invention has high antistatic properties, flame retardant properties and toughness.

[0009] The present invention provides a PVC modified resin composition, which comprises, in parts by mass:

[0010] 90~110 parts PVC;

[0011] 8 to 12 parts of a toughening agent, wherein the toughening agent is selected from one or more of methyl methacrylate-butadiene-styrene copolymer (MBS) or chlorinated polyethylene (CPE), wherein the methyl methacrylate-butadiene-styrene copolymer comprises 10% to 30% by weight of methyl methacrylate and 70% to 90% by weight of butadiene-styrene copolymer;

[0012] 3~5 parts of stabilizer;

[0013] 0~12 parts of phthalate plasticizer;

[0014] 4-8 parts antimony trioxide;

[0015] 2~12 parts of conductive carbon black;

[0016] and 3 to 6 parts of lubricant.

[0017] Preferably, the PVC modified resin composition provided by the present invention comprises, in parts by mass: 90 to 110 parts of PVC; 8 to 12 parts of a toughening agent, wherein the toughening agent is selected from one or more of methyl methacrylate-butadiene-styrene copolymer or chlorinated polyethylene, wherein the methyl methacrylate-butadiene-styrene copolymer comprises 10% to 30% by mass of methyl methacrylate and 70% to 90% by mass of a butadiene-styrene copolymer; 3 to 5 parts of a stabilizer; 8 to 12 parts of an ortho-phthalic plasticizer; 4 to 8 parts of antimony trioxide; 2 to 12 parts of conductive carbon black; and 3 to 6 parts of a lubricant.

[0018] More preferably, the PVC modified resin composition provided by the present invention comprises, by mass: 100 parts of PVC; the toughening agent is selected from 7 to 8 parts of methyl methacrylate-butadiene-styrene copolymer and 2 to 3 parts of chlorinated polyethylene; 3 to 5 parts of a stabilizer; 8 to 12 parts of an ortho-phthalic plasticizer; 4 to 6 parts of antimony trioxide; 7 to 10 parts of conductive carbon black; and 3 to 6 parts of a lubricant.

[0019] The PVC modified resin composition provided herein is an antistatic, flame-retardant, and toughened PVC modified resin comprising 90 to 110 parts by weight of PVC, preferably 100 parts by weight. The PVC has a number average molecular weight of 60,000 to 100,000 Daltons. In some embodiments of the present invention, the PVC is selected from SG-5 PVC.

[0020] The PVC modified resin composition provided by the present invention comprises 8 to 12 parts of a toughening agent by mass, preferably 9 to 11 parts of a toughening agent. The toughening agent of the present invention is selected from one or more of methyl methacrylate-butadiene-styrene copolymer or chlorinated polyethylene. Preferably, the toughening agent is selected from methyl methacrylate-butadiene-styrene copolymer and chlorinated polyethylene. More preferably, the toughening agent is selected from 7 to 8 parts of methyl methacrylate-butadiene-styrene copolymer and 2 to 3 parts of chlorinated polyethylene. The present invention mixes methyl methacrylate-butadiene-styrene copolymer and chlorinated polyethylene in a certain proportion to synergistically toughen PVC. The methyl methacrylate-butadiene-styrene copolymer of the present invention is the same as described above and will not be repeated here.

[0021] The PVC modified resin composition provided by the present invention comprises 0 to 12 parts by weight of a phthalate plasticizer, preferably 8 to 12 parts by weight of a phthalate plasticizer. The phthalate plasticizer of the present invention comprises one or more of dioctyl phthalate, dibutyl phthalate, and didecyl phthalate. In some embodiments of the present invention, the phthalate plasticizer of the present invention is dioctyl phthalate and dibutyl phthalate in a mass ratio of (2.5 to 3.5):1.

[0022] The PVC modified resin composition provided by the present invention comprises 4 to 8 parts by mass of antimony trioxide, preferably 4 to 6 parts by mass of antimony trioxide. The antimony trioxide of the present invention acts as a flame retardant in the PVC modified resin composition.

[0023] The PVC modified resin composition provided by the present invention comprises 2 to 12 parts by mass of conductive carbon black, preferably 7 to 10 parts by mass of conductive carbon black. The conductive carbon black of the present invention acts as an antistatic agent in the PVC modified resin composition.

[0024] The PVC modified resin composition provided by the present invention further comprises, by weight, 3 to 5 parts of a stabilizer and 3 to 6 parts of a lubricant. The stabilizer is selected from one or more of a calcium zinc stabilizer and tribasic lead sulfate; and the lubricant is selected from one or more of calcium stearate, liquid wax, zinc stearate, barium stearate, and polyethylene wax.

[0025] In one embodiment of the present invention, the PVC modified resin composition includes: 100 parts of SG-5 type PVC; 10 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer includes 30% by weight of methyl methacrylate and 70% by weight of butadiene-styrene copolymer; 4 parts of calcium zinc stabilizer; 5 parts of antimony trioxide; 7.5 parts of conductive carbon black; 3 parts of calcium stearate; and 2 parts of liquid wax.

[0026] In another embodiment of the present invention, the PVC modified resin composition includes: 100 parts of SG-5 type PVC; 10 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer includes 28% by mass of methyl methacrylate and 72% by mass of butadiene-styrene copolymer; 4 parts of calcium zinc stabilizer; 10 parts of phthalate plasticizer; 5 parts of antimony trioxide; 10 parts of conductive carbon black; 2 parts of calcium stearate; and 2 parts of liquid wax.

[0027] In another embodiment of the present invention, the PVC modified resin composition includes: 100 parts of SG-5 type PVC; 10 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer includes 25% by weight of methyl methacrylate and 75% by weight of butadiene-styrene copolymer; 4 parts of calcium zinc stabilizer; 10 parts of o-phthalate plasticizer; 5 parts of antimony trioxide; 2.5 parts of conductive carbon black; 2 parts of calcium stearate; and 2 parts of liquid wax.

[0028] In another embodiment of the present invention, the PVC modified resin composition includes: 100 parts of SG-5 type PVC; 7.5 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer includes 20% by weight of methyl methacrylate and 80% by weight of butadiene-styrene copolymer; 2.5 parts of CPE; 4 parts of calcium zinc stabilizer; 10 parts of o-phthalate plasticizer; 5 parts of antimony trioxide; 7.5 parts of conductive carbon black; 2 parts of calcium stearate; and 2 parts of liquid wax.

[0029] The present invention also provides a PVC modified resin obtained from any of the aforementioned PVC modified resin compositions. This invention utilizes MBS and / or CPE to toughen PVC; antimony trioxide is used as a flame retardant, and conductive carbon black is used as an antistatic agent; stabilizers and lubricants are added, and after co-blending and extrusion, a flame-retardant, antistatic, and low-temperature-resistant PVC modified resin is obtained. This allows PVC to possess multiple functions, including high toughness, flame retardancy, and antistatic properties, thereby expanding the application of PVC.

[0030] The present invention also provides a method for preparing a PVC modified resin, comprising the following steps: subjecting any of the above-mentioned PVC modified resin compositions to melt-extrusion granulation to obtain a PVC modified resin. Specifically, subjecting any of the above-mentioned PVC modified resin compositions to mechanical blending, and then subjecting the mixed PVC modified resin composition to melt-extrusion granulation to obtain a PVC modified resin. The mechanical blending time of the present invention is 3 to 10 minutes. The melt extrusion granulation of the present invention is carried out in a single-screw extruder, and the temperature of the first zone of the single-screw extruder is 170°C to 180°C, the temperature of the second zone is 180°C to 190°C, and the temperature of the third zone is 180°C to 190°C. ℃, the temperature of the fourth zone is 180℃~190 ℃, the temperature of the fifth zone is 185℃~195 ℃; the screw speed of the single-screw extruder is 100 rpm~300 rpm.

[0031] The present invention also provides the use of the aforementioned PVC modified resin, or the PVC modified resin obtained by the aforementioned preparation method, in the preparation of mining pipes, plates, or injection-molded plastic parts. The PVC modified resin provided by the present invention can be used to prepare mining pipes, plates, or injection-molded plastic parts, and the products have excellent anti-static and flame-retardant properties.

[0032] The present invention provides a PVC modified resin composition, a PVC modified resin, and a preparation method and application thereof. The PVC modified resin provided by the present invention uses methyl methacrylate-butadiene-styrene copolymer and / or chlorinated polyethylene as a toughening agent for PVC, and uses an orthophthalic plasticizer to effectively improve the tensile elongation at break and the impact strength of PVC, thereby solving the serious defect of PVC brittleness and being suitable for various processing requirements; the surface resistance of the PVC modified resin is significantly reduced by combining with conductive carbon black, and the flame retardant performance is improved by combining with antimony trioxide. The blending and modification preparation process of the PVC modified resin provided by the present invention is simple, and it is easy to industrialize after being scaled up through the production line. As a PVC modified resin product, it has a wide range of applications. By adjusting the formula, a variety of PVC series products that can meet the needs of different uses can be obtained, such as mining pipes, plates or injection-molded plastic parts. The industrialization of the PVC modified resin provided by the present invention is conducive to promoting the development of the new mining pipe material industry and has important economic and social significance. DETAILED DESCRIPTION

[0033] The present invention discloses a PVC modified resin composition, a PVC modified resin, and a preparation method and application thereof. Those skilled in the art may refer to the contents herein and appropriately modify the process parameters to achieve the desired results. It should be noted that all similar substitutions and modifications obvious to those skilled in the art are considered to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments, and relevant persons will obviously be able to modify or appropriately alter and combine the methods and applications herein without departing from the content, spirit, and scope of the present invention to implement and apply the technology of the present invention.

[0034] The present invention will be further described below with reference to the embodiments:

[0035] Example 1

[0036] This embodiment provides an anti-static, flame-retardant and toughened PVC modified resin, the mass fraction of the components of the formula is as follows:

[0037] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 68750 Daltons;

[0038] 10 parts of toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0039] 4 parts calcium zinc stabilizer;

[0040] 5 parts of flame retardant antimony trioxide;

[0041] 7.5 parts of conductive carbon black;

[0042] 3 parts calcium stearate;

[0043] 2 parts liquid wax.

[0044] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190 o C, screw speed: 200 rpm.

[0045] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 45.2MPa, elongation at break of 45.7%, notched impact strength of 16.4KJ / m 2 , surface resistance 10 3 Flame retardant performance, vertical combustion test (UL-94) reaches V-0 level.

[0046] Example 2

[0047] This embodiment provides an anti-static, flame-retardant and toughened PVC modified resin, the mass fraction of the components of the formula is as follows:

[0048] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 68750 Daltons;

[0049] 10 parts of toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0050] 4 parts calcium zinc stabilizer;

[0051] 10 parts of phthalate plasticizer (a blend of dioctyl phthalate and dibutyl phthalate in a mass ratio of 3:1);

[0052] 5 parts of flame retardant antimony trioxide;

[0053] 10 parts conductive carbon black;

[0054] 2 parts calcium stearate;

[0055] 2 parts liquid wax.

[0056] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190 o C, screw speed: 200 rpm.

[0057] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 41.5MPa, elongation at break of 82.0%, notched impact strength of 11.4KJ / m 2 , surface resistance 10 4 Flame retardant performance, vertical combustion test (UL-94) reaches V-0 level.

[0058] Example 3

[0059] This embodiment provides an anti-static, flame-retardant and toughened PVC modified resin, the components and mass fractions of which are as follows:

[0060] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 68750 Daltons;

[0061] 10 parts of toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0062] 4 parts calcium zinc stabilizer;

[0063] 10 parts of phthalate plasticizer (a blend of dioctyl phthalate and dibutyl phthalate in a mass ratio of 3:1);

[0064] 5 parts of flame retardant antimony trioxide;

[0065] 2.5 parts of conductive carbon black;

[0066] 2 parts calcium stearate;

[0067] 2 parts liquid wax.

[0068] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190 o C, screw speed: 200 rpm.

[0069] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 43.1MPa, elongation at break of 116.3%, notched impact strength of 24.8KJ / m 2 , surface resistance 10 7 Flame retardant performance, vertical combustion test (UL-94) reaches V-0 level.

[0070] Example 4

[0071] The present invention provides an anti-static, flame-retardant and toughened PVC modified resin, the components and mass fractions of which are as follows:

[0072] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 68750 Daltons;

[0073] 7.5 parts of a toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0074] 2.5 parts of toughening agent CPE;

[0075] 4 parts calcium zinc stabilizer;

[0076] 10 parts of phthalate plasticizer (a blend of dioctyl phthalate and dibutyl phthalate in a mass ratio of 3:1);

[0077] 5 parts of flame retardant antimony trioxide;

[0078] 7.5 parts of conductive carbon black;

[0079] 2 parts calcium stearate;

[0080] 2 parts liquid wax.

[0081] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190 o C, screw speed: 200 rpm.

[0082] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 42.6MPa, elongation at break of 108.7%, notched impact strength of 27.6KJ / m 2 , surface resistance 10 3 Flame retardant performance, vertical combustion test (UL-94) reaches V-0 level.

[0083] Comparative Example 1

[0084] Weigh each component according to the following formula and mass:

[0085] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 68750 Daltons;

[0086] 10 parts of toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0087] 4 parts calcium zinc stabilizer;

[0088] 5 parts of flame retardant antimony trioxide;

[0089] 2 parts calcium stearate;

[0090] 2 parts liquid wax.

[0091] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190o C, screw speed: 200 rpm.

[0092] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 45.7MPa, elongation at break of 135%, notched impact strength of 114.1KJ / m 2 , surface resistance 10 11 Flame retardant performance, vertical combustion test (UL-94) reaches V-0 level.

[0093] Comparative Example 2

[0094] Weigh each component according to the following formula and mass:

[0095] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 68750 Daltons;

[0096] 7.5 parts of a toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0097] 2.5 parts of toughening agent CPE;

[0098] 4 parts calcium zinc stabilizer;

[0099] 2 parts calcium stearate;

[0100] 2 parts liquid wax.

[0101] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190 o C, screw speed: 200 rpm.

[0102] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 37.2MPa, elongation at break of 107%, notched impact strength of 91.6KJ / m 2 , surface resistance 10 11 Ω; Flame retardant performance, vertical burning test (UL-94) does not reach V-0 level.

[0103] Comparative Example 3

[0104] Weigh each component according to the following formula and mass:

[0105] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 60,000 to 100,000 Daltons;

[0106] 10 parts of toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0107] 4 parts calcium zinc stabilizer;

[0108] 10 parts of phthalate plasticizer (a blend of dioctyl phthalate and dibutyl phthalate in a mass ratio of 3:1);

[0109] 5 parts of flame retardant antimony trioxide;

[0110] 2 parts calcium stearate;

[0111] 2 parts liquid wax.

[0112] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190 o C, screw speed: 200 rpm.

[0113] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 40.8MPa, elongation at break of 115%, notched impact strength of 96.3KJ / m 2 , surface resistance 10 11 Flame retardant performance, vertical combustion test (UL-94) reaches V-0 level.

[0114] Comparative Example 4

[0115] Weigh each component according to the following formula and mass:

[0116] 100 parts of SG-5 type PVC, wherein the number average molecular weight of the SG-5 type PVC is 68750 Daltons;

[0117] 7.5 parts of a toughening agent MBS, wherein the toughening agent MBS is a methyl methacrylate-butadiene-styrene copolymer, wherein the mass percentage content of methyl methacrylate is 28% and the mass percentage content of butadiene-styrene is 72%;

[0118] 2.5 parts of toughening agent CPE;

[0119] 4 parts calcium zinc stabilizer;

[0120] 2 parts calcium stearate;

[0121] 2 parts liquid wax.

[0122] The steps and conditions of extrusion granulation are as follows: weigh each component according to the formula, mechanically blend each component in a mixer for 3 minutes, then add the mixed material into a single screw extruder for melt extrusion granulation to obtain PVC modified resin; the extrusion granulation conditions are: the setting temperature of the single screw extruder is: zone 1: 175 o C, Zone 2: 180 o C, Zone 3: 185 o C, District 4: 185 o C, Zone 5: 190 o C, screw speed: 200 rpm.

[0123] The mechanical properties of the obtained anti-static flame retardant and toughened PVC modified resin are as follows: tensile strength of 44.9MPa, elongation at break of 172.6%, notched impact strength of 91.6KJ / m 2 , surface resistance 10 111 Ω; Flame retardant performance, vertical burning test (UL-94) does not reach V-0 level.

[0124] It can be seen from the above Examples 1 and 2 and Comparative Examples 1, 2, and 3 that MBS can significantly improve the impact strength of PVC, and the addition of conductive carbon black reduces the impact strength of the PVC modified resin; from the above Examples 1 and 2 and Comparative Example 2, it can be seen that the flame retardant antimony trioxide has a significant effect on the flame retardant properties of the PVC modified resin, and the vertical burning test (UL-94) of Comparative Example 2 without antimony trioxide does not reach the V-0 level; from the above Examples 1 and 2 and Comparative Examples 1, 2, and 3, it can be seen that conductive carbon black can significantly reduce the surface resistance of the PVC modified resin, and the surface resistance of the 10% PVC modified resin without conductive carbon black is 0. 11 Ω reduced to 10 4 and 10 3 From the comparative analysis of Example 4 and Comparative Example 4, it can be seen that CPE replacing part of MBS can further improve the impact strength of PVC, and conductive carbon black can significantly reduce the surface resistance of PVC modified resin.11 Ω reduced to 10 3 The present invention solves the flame retardant and antistatic properties of PVC resin, thereby expanding the application field of PVC and enabling it to be used in special pipelines for coal mines for gas extraction and drainage.

[0125] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A PVC modified resin composition, characterized in that, In parts by mass, including: 90~110 parts PVC; 8 to 12 parts of a toughening agent, wherein the toughening agent is selected from one or more of methyl methacrylate-butadiene-styrene copolymer or chlorinated polyethylene, wherein the methyl methacrylate-butadiene-styrene copolymer comprises 10% to 30% by weight of methyl methacrylate and 70% to 90% by weight of butadiene-styrene copolymer; 3~5 parts of stabilizer; 0~12 parts of phthalate plasticizer; 4-8 parts antimony trioxide; 2~12 parts of conductive carbon black; and 3 to 6 parts of lubricant.

2. The PVC modified resin composition according to claim 1, wherein include: 90~110 parts PVC; 8~12 parts toughening agent; 3~5 parts of stabilizer; 8~12 parts of phthalate plasticizer; 4-8 parts antimony trioxide; 2~12 parts of conductive carbon black; 3~6 parts lubricant.

3. The PVC modified resin composition according to claim 2, wherein include: 100 parts PVC; The toughening agent is selected from 7 to 8 parts of methyl methacrylate-butadiene-styrene copolymer and 2 to 3 parts of chlorinated polyethylene; 3~5 parts of stabilizer; 8~12 parts of phthalate plasticizer; 4-6 parts antimony trioxide; 7~10 parts of conductive carbon black; 3~6 parts lubricant.

4. The PVC modified resin composition according to any one of claims 1 to 3, wherein The number average molecular weight of the PVC is 60,000 Daltons to 100,000 Daltons.

5. The PVC modified resin composition according to any one of claims 1 to 3, wherein The PVC is selected from SG-5 type PVC; The phthalate plasticizer includes one or more of dioctyl phthalate, dibutyl phthalate, and didecyl phthalate; The stabilizer is selected from one or more of calcium zinc stabilizer and tribasic lead sulfate; The lubricant is selected from one or more of calcium stearate, liquid wax, zinc stearate, barium stearate, and polyethylene wax.

6. The PVC modified resin composition according to claim 1, characterized in that include: 100 parts of SG-5 type PVC; 10 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer comprises 30% by weight of polymethyl methacrylate and 70% by weight of butadiene-styrene copolymer; 4 parts of calcium zinc stabilizer; 5 parts of antimony trioxide; 7.5 parts of conductive carbon black; 3 parts of calcium stearate; and 2 parts of liquid wax; Alternatively, include: 100 parts of SG-5 type PVC; 10 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer comprises 28% by weight of polymethyl methacrylate and 72% by weight of butadiene-styrene copolymer; 4 parts of calcium zinc stabilizer; 10 parts of phthalate plasticizer; 5 parts of antimony trioxide; 10 parts of conductive carbon black; 2 parts of calcium stearate; and 2 parts of liquid wax; Alternatively, include: 100 parts of SG-5 type PVC; 10 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer comprises 25% by weight of polymethyl methacrylate and 75% by weight of butadiene-styrene copolymer; 4 parts of calcium zinc stabilizer; 10 parts of o-phthalate plasticizer; 5 parts of antimony trioxide; 2.5 parts of conductive carbon black; 2 parts of calcium stearate; and 2 parts of liquid wax; Alternatively, include: 100 parts of SG-5 type PVC; 7.5 parts of methyl methacrylate-butadiene-styrene copolymer, wherein the methyl methacrylate-butadiene-styrene copolymer includes 20% by weight of polymethyl methacrylate and 80% by weight of butadiene-styrene copolymer; 2.5 parts of chlorinated polyethylene; 4 parts of calcium zinc stabilizer; 10 parts of o-phthalate plasticizer; 5 parts of antimony trioxide; 7.5 parts of conductive carbon black; 2 parts of calcium stearate; and 2 parts of liquid wax.

7. A PVC modified resin, characterized in that: The PVC modified resin composition is obtained from the PVC modified resin composition according to any one of claims 1 to 6.

8. A method for preparing a PVC modified resin, characterized in that: The following steps are involved: The PVC modified resin composition according to any one of claims 1 to 6 is melt-extruded and granulated to obtain a PVC modified resin.

9. The PVC modified resin according to claim 8, characterized in that The melt extrusion granulation is carried out in a single-screw extruder. The temperature of zone 1 of the single-screw extruder is 170°C to 180°C, the temperature of zone 2 is 180°C to 190°C, the temperature of zone 3 is 180°C to 190°C, the temperature of zone 4 is 180°C to 190°C, and the temperature of zone 5 is 185°C to 195°C.

10. Use of the PVC modified resin according to claim 7 or the PVC modified resin obtained by the preparation method according to claim 8 or 9 in the preparation of mining pipes, plates or injection-molded plastic parts.