CN113637271A - Corrosion-resistant corrugated pipe based on PVC (polyvinyl chloride) and production process thereof - Google Patents
Corrosion-resistant corrugated pipe based on PVC (polyvinyl chloride) and production process thereof Download PDFInfo
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- CN113637271A CN113637271A CN202110975211.7A CN202110975211A CN113637271A CN 113637271 A CN113637271 A CN 113637271A CN 202110975211 A CN202110975211 A CN 202110975211A CN 113637271 A CN113637271 A CN 113637271A
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- corrugated pipe
- pvc
- parts
- temperature
- resistant corrugated
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- 229920000915 polyvinyl chloride Polymers 0.000 title claims abstract description 32
- 239000004800 polyvinyl chloride Substances 0.000 title claims abstract description 32
- 230000007797 corrosion Effects 0.000 title claims abstract description 29
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 41
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003063 flame retardant Substances 0.000 claims abstract description 26
- 239000000654 additive Substances 0.000 claims abstract description 23
- 230000000996 additive effect Effects 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 11
- 239000000314 lubricant Substances 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000009775 high-speed stirring Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 18
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000002904 solvent Substances 0.000 claims description 13
- HUMNYLRZRPPJDN-UHFFFAOYSA-N benzaldehyde Chemical compound O=CC1=CC=CC=C1 HUMNYLRZRPPJDN-UHFFFAOYSA-N 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 12
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 8
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000003381 stabilizer Substances 0.000 claims description 7
- BSYJHYLAMMJNRC-UHFFFAOYSA-N 2,4,4-trimethylpentan-2-ol Chemical compound CC(C)(C)CC(C)(C)O BSYJHYLAMMJNRC-UHFFFAOYSA-N 0.000 claims description 6
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 claims description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- QNGNSVIICDLXHT-UHFFFAOYSA-N para-ethylbenzaldehyde Natural products CCC1=CC=C(C=O)C=C1 QNGNSVIICDLXHT-UHFFFAOYSA-N 0.000 claims description 6
- 239000005049 silicon tetrachloride Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229940017219 methyl propionate Drugs 0.000 claims description 5
- PXMJCECEFTYEKE-UHFFFAOYSA-N Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-, methyl ester Chemical compound COC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 PXMJCECEFTYEKE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000008096 xylene Substances 0.000 claims description 4
- 229920000877 Melamine resin Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 claims description 3
- 238000004821 distillation Methods 0.000 claims description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 239000001993 wax Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 239000004566 building material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract 2
- 239000003963 antioxidant agent Substances 0.000 abstract 1
- 230000003078 antioxidant effect Effects 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000005336 cracking Methods 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 4
- 239000012065 filter cake Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000012295 chemical reaction liquid Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003828 vacuum filtration Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical group CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 150000002148 esters Chemical group 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic System
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/6564—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms
- C07F9/6571—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms
- C07F9/657163—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms the ring phosphorus atom being bound to at least one carbon atom
- C07F9/657172—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms the ring phosphorus atom being bound to at least one carbon atom the ring phosphorus atom and one oxygen atom being part of a (thio)phosphinic acid ester: (X = O, S)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
Abstract
The invention relates to a PVC-based corrosion-resistant corrugated pipe and a production process thereof, belonging to the technical field of building materials, wherein the corrugated pipe comprises the following raw materials: polyvinyl chloride resin powder, talcum powder, calcium carbonate, a heat stabilizer, an additive, a lubricant and titanium dioxide; the production process of the corrugated pipe comprises the following steps: firstly, putting the raw materials into a hot mixing cylinder of a mixer unit, starting high-speed stirring, and discharging the materials into a cold mixing cylinder for stirring and cooling when the temperature of the hot mixing cylinder reaches 125-135 ℃; stopping stirring when the temperature of the cold mixing cylinder is reduced to be below 55 ℃ to obtain a mixed material; and secondly, adding the mixed material into an extruder for plasticizing, molding and cutting. The additive is prepared by taking flame-retardant components as raw materials, introducing hindered phenol structures into the flame-retardant components, and taking the hindered phenol structures and the carrier in molecules as each other, so that the additive generates synergism, and the prepared corrugated pipe has good antioxidant and flame-retardant effects.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a PVC-based corrosion-resistant corrugated pipe and a production process thereof.
Background
The corrugated pipe is used as a pore-forming material of a prestress post-tensioning method and is an important component of a prestress system, the metal corrugated pipe is used as a main pore-forming material for a long time, and although the corrugated pipe can protect the reinforcing bars, the corrugated pipe still has the possibility of generating corrosion under the condition that concrete is cracked or the service time is too long, so that the corrugated pipe cannot well protect the reinforcing bars. The metal corrugated pipe has the defects of non-corrosion resistance, poor sealing performance, high possibility of damage, high friction resistance and the like, and is gradually replaced by other corrugated pipes, particularly plastic corrugated pipes. The method can solve the problems of incomplete and non-compact grouting of metal corrugated pipe pore canals in the traditional pressure grouting process, provides two layers of powerful protective barriers for a post-tensioned prestressed system, and greatly improves the protection conditions of prestressed tendons, so that the safety and durability of a prestressed structure and a member are improved, wherein the PVC corrugated pipe has poor flame retardant property and certain limitation in use.
Disclosure of Invention
The invention aims to provide a corrosion-resistant corrugated pipe based on PVC and a production process thereof.
The purpose of the invention can be realized by the following technical scheme:
the corrosion-resistant corrugated pipe based on PVC comprises the following raw materials in parts by weight:
100 parts of polyvinyl chloride resin powder, 5-20 parts of talcum powder, 5-20 parts of calcium carbonate, 4-8 parts of heat stabilizer, 1-3 parts of additive, 0.3-1.2 parts of lubricant and 1.5-3 parts of titanium dioxide;
the additive is prepared by the following steps:
mixing 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate, a flame-retardant component and a solvent, heating to 90 ℃ under the protection of nitrogen, adding a catalyst, heating to 130-140 ℃, reacting for 3.5-4h, cooling the reaction liquid to 50 ℃ after the reaction is finished, mixing the obtained reaction liquid with petroleum ether, cooling for crystallization, and then recrystallizing with methanol to obtain the additive.
Further, the catalyst is organic tin; the solvent is one of toluene and N, N-dimethylformamide, and the dosage ratio of the methyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, the flame-retardant component, the solvent and the catalyst is 7 g: 3 g: 60mL of: 0.5 g.
Further, the heat stabilizer is one of calcium zinc stabilizer or organic tin stabilizer, and the lubricant is one of paraffin, polyethylene wax and stearic acid.
Further, the flame retardant component is prepared by the steps of:
step A11, mixing xylene, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and benzaldehyde, heating and refluxing for 5 hours at the temperature of 125 ℃, performing vacuum filtration after the reaction is finished, washing the obtained filter cake for 3-5 times by using absolute ethyl alcohol, and drying at the temperature of 80 ℃ to constant weight after the washing is finished to obtain an intermediate 1; wherein the dosage ratio of the dimethylbenzene to the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to the benzaldehyde is 100 mL: 0.04 mol: 0.05 mol;
the reaction process is as follows:
step A12, mixing the intermediate 1 and dioxane, then dripping silicon tetrachloride, controlling the temperature of a reaction system to be not higher than 20 ℃ in the dripping process, keeping the temperature at 30 ℃ for reaction for 6 hours after dripping is finished, then cooling to 20 ℃, decompressing and filtering, washing a filter cake with dioxane, and drying at 40 ℃ to constant weight after washing is finished to obtain an intermediate 2; wherein the dosage ratio of the intermediate 1, dioxane and silicon tetrachloride is 6.5 g: 1.8 g: 80 mL;
the reaction process is as follows:
step A13, mixing the intermediate 2 and dioxane, adding deionized water, heating to 60 ℃, reacting for 4 hours, adding melamine to adjust the pH value to 6, and then carrying out reduced pressure distillation to remove dioxane to obtain a flame-retardant component; wherein the dosage ratio of the intermediate 2, dioxane and deionized water is 37 g: 100mL of: 2g of the total weight.
The reaction process is as follows:
a production process of a PVC-based corrosion-resistant corrugated pipe comprises the following steps:
firstly, putting the raw materials into a hot mixing cylinder of a high-speed mixing unit, starting high-speed stirring, and discharging the materials into a cold mixing cylinder for stirring and cooling when the temperature of the hot mixing cylinder reaches 125-; stopping stirring when the temperature of the cold mixing cylinder is reduced to be below 55 ℃ to obtain a mixed material;
and secondly, adding the mixed material into an extruder for plasticizing, molding and cutting to obtain the PVC-based corrosion-resistant corrugated pipe.
Further, the extruder is a twin-screw extruder, the temperature of the cylinder is set to be 190 ℃ and the molding temperature is set to be 200 ℃ and 160 ℃.
The invention has the beneficial effects that:
the additive is prepared by taking a flame-retardant component as a raw material and carrying out ester exchange with 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate, wherein the flame-retardant component contains two flame-retardant elements of silicon and phosphorus, and has a good synergistic flame-retardant effect. In addition, the prepared additive contains an oxysilane bond, so that the prepared product has uniform high-temperature resistance and hydrophobic property, and the contact of a solvent is blocked, thereby improving the corrosion resistance of the corrugated pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing a flame-retardant component:
step A11, mixing xylene, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and benzaldehyde, heating and refluxing for 5 hours at the temperature of 125 ℃, after the reaction is finished, performing vacuum filtration, washing the obtained filter cake with absolute ethyl alcohol, and after the washing is finished, drying at the temperature of 80 ℃ to constant weight to obtain an intermediate 1; wherein the dosage ratio of the dimethylbenzene to the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to the benzaldehyde is 100 mL: 0.04 mol: 0.05 mol;
step A12, mixing the intermediate 1 and dioxane, then dripping silicon tetrachloride, controlling the temperature of a reaction system to be not higher than 20 ℃ in the dripping process, keeping the temperature at 30 ℃ for reaction for 6 hours after dripping is finished, then cooling to 20 ℃, decompressing and filtering, washing a filter cake with dioxane, and drying at 40 ℃ to constant weight after washing is finished to obtain an intermediate 2; wherein the dosage ratio of the intermediate 1, dioxane and silicon tetrachloride is 6.5 g: 1.8 g: 80 mL;
step A13, mixing the intermediate 2 and dioxane, adding deionized water, heating to 60 ℃, reacting for 4 hours, adding melamine to adjust the pH value to 6, and then carrying out reduced pressure distillation to remove dioxane to obtain a flame-retardant component; wherein the dosage ratio of the intermediate 2, dioxane and deionized water is 37 g: 100mL of: 2g of the total weight.
Example 2
Preparing an additive:
mixing 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate, a flame-retardant component and a solvent, heating to 90 ℃ under the protection of nitrogen, adding a catalyst, heating to 130 ℃, reacting for 3.5h, cooling a reaction solution to 50 ℃ after the reaction is finished, mixing the obtained reaction solution with petroleum ether, cooling for crystallization, and recrystallizing with methanol to obtain the additive.
Wherein the catalyst is organic tin; the solvent is toluene, the dosage ratio of the methyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, the flame-retardant component, the solvent and the catalyst is 7 g: 3 g: 60mL of: 0.5g of a flame-retardant component as prepared in example 1.
Example 3
Preparing an additive:
mixing 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate, a flame-retardant component and a solvent, heating to 90 ℃ under the protection of nitrogen, adding a catalyst, heating to 140 ℃, reacting for 4 hours, cooling a reaction solution to 50 ℃ after the reaction is finished, mixing the obtained reaction solution with petroleum ether, cooling for crystallization, and recrystallizing with methanol to obtain the additive.
Wherein the catalyst is organic tin; the solvent is N, N-dimethylformamide, the methyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, the flame retardant component, the solvent and the catalyst are used in a ratio of 7 g: 3 g: 60mL of: 0.5g of a flame-retardant component as prepared in example 1.
Example 4
Preparing a corrosion-resistant corrugated pipe based on PVC:
firstly, putting raw materials into a hot mixing cylinder of a high-speed mixer set, starting high-speed stirring, and discharging the materials into a cold mixing cylinder for stirring and cooling when the temperature of the hot mixing cylinder reaches 125 ℃; stopping stirring when the temperature of the cold mixing cylinder is reduced to be below 55 ℃ to obtain a mixed material;
and secondly, adding the mixed material into an extruder for plasticizing, molding and cutting to obtain the PVC-based corrosion-resistant corrugated pipe.
Wherein the extruder is a double-screw extruder, the temperature of a cylinder is set to be 170 ℃, and the forming temperature is set to be 160 ℃. The weight parts of the raw materials are as follows: 100 parts of polyvinyl chloride resin powder, 5 parts of talcum powder, 5 parts of calcium carbonate, 4 parts of heat stabilizer, 1 part of additive, 0.3 part of lubricant and 1.5 parts of titanium dioxide; the heat stabilizer was calcium zinc stabilizer, the lubricant was paraffin wax, and the additive was the one obtained in example 2.
Example 5
Preparing a corrosion-resistant corrugated pipe based on PVC:
firstly, putting raw materials into a hot mixing cylinder of a high-speed mixer set, starting high-speed stirring, and discharging the materials into a cold mixing cylinder for stirring and cooling when the temperature of the hot mixing cylinder reaches 130 ℃; stopping stirring when the temperature of the cold mixing cylinder is reduced to be below 55 ℃ to obtain a mixed material;
and secondly, adding the mixed material into an extruder for plasticizing, molding and cutting to obtain the PVC-based corrosion-resistant corrugated pipe.
Wherein the extruder is a double-screw extruder, the temperature of a cylinder is set to be 180 ℃, and the molding temperature is set to be 200 ℃. The weight parts of the raw materials are as follows: 100 parts of polyvinyl chloride resin powder, 15 parts of talcum powder, 15 parts of calcium carbonate, 6 parts of heat stabilizer, 3 parts of additive, 1 part of lubricant and 2 parts of titanium dioxide; the heat stabilizer is an organotin stabilizer, the lubricant is polyethylene wax, and the additive is prepared in example 2.
Example 6
Preparing a corrosion-resistant corrugated pipe based on PVC:
firstly, putting raw materials into a hot mixing cylinder of a high-speed mixer set, starting high-speed stirring, and discharging the materials into a cold mixing cylinder for stirring and cooling when the temperature of the hot mixing cylinder reaches 135 ℃; stopping stirring when the temperature of the cold mixing cylinder is reduced to be below 55 ℃ to obtain a mixed material;
and secondly, adding the mixed material into an extruder for plasticizing, molding and cutting to obtain the PVC-based corrosion-resistant corrugated pipe.
Wherein the extruder is a double-screw extruder, the temperature of a cylinder is set to be 190 ℃, and the molding temperature is set to be 200 ℃. The weight parts of the raw materials are as follows: 100 parts of polyvinyl chloride resin powder, 20 parts of talcum powder, 20 parts of calcium carbonate, 8 parts of heat stabilizer, 3 parts of additive, 1.2 parts of lubricant and 3 parts of titanium dioxide; the heat stabilizer was an organotin stabilizer, the lubricant was stearic acid, and the additive was the one prepared in example 2.
Comparative example 1
The additive in example 5 was replaced with antioxidant 1010, and the rest of the raw materials and the preparation process were kept unchanged.
Comparative example 2
The additive of example 5 was removed and the remaining raw materials and preparation process remained the same.
The samples prepared in examples 4-6 and comparative examples 1-2 are tested, the prepared samples are put into a QUV/spray accelerated aging instrument for accelerated aging performance detection, and the color difference change of the test samples is tested after a certain time;
the test results are shown in table 1 below:
TABLE 1
| Aging time/h | Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 |
| 4 | 1.25 | 1.14 | 0.95 | 1.16 | 3.84 |
| 10 | 3.18 | 3.01 | 2.92 | 3.69 | 11.17 |
| 20 | 6.25 | 6.12 | 5.81 | 7.85 | 14.25 |
The samples prepared in examples 4 to 6 and comparative example 1 were tested for oxygen index and smoke density according to the test method in GB20286-2006 "requirements and identification of flammability of flame retardant articles and components in public places", the samples were placed in a hydrochloric acid solution with a mass fraction of 20%, and the surface condition was observed; placing the sample in 1mol/L sodium hydroxide solution to observe the surface condition;
the test results are shown in table 2 below:
TABLE 2
| Example 4 | Example 5 | Example 6 | Comparative example 1 | |
| Oxygen index% | 41.7 | 42.1 | 42.5 | 27.5 |
| Density of smoke | 71.2 | 70.8 | 70.5 | 79.8 |
| Acid corrosion resistance | Surface non-cracking | Surface non-cracking | Surface non-cracking | Surface cracking |
| Alkali corrosion resistance | Surface non-cracking | Surface non-cracking | Surface non-cracking | Surface cracking |
The oxygen index of the prepared corrosion-resistant corrugated pipe based on PVC is more than 40, the smoke density is less than 72, and the corrosion-resistant corrugated pipe meets the flame-retardant requirement.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (7)
1. The corrosion-resistant corrugated pipe based on PVC comprises the following raw materials in parts by weight:
100 parts of polyvinyl chloride resin powder, 5-20 parts of talcum powder, 5-20 parts of calcium carbonate, 4-8 parts of heat stabilizer, 1-3 parts of additive, 0.3-1.2 parts of lubricant and 1.5-3 parts of titanium dioxide; the additive is characterized by being prepared by the following steps:
mixing 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate, a flame retardant component and a solvent, heating to 90 ℃ under the protection of nitrogen, adding a catalyst, heating to 130-140 ℃, and reacting for 3.5-4h to obtain the additive.
2. The PVC-based corrosion-resistant corrugated pipe of claim 1, wherein the catalyst is organic tin; the solvent is one of toluene and N, N-dimethylformamide, and the dosage ratio of the methyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, the flame-retardant component, the solvent and the catalyst is 7 g: 3 g: 60mL of: 0.5 g.
3. The PVC-based corrosion-resistant corrugated pipe of claim 1, wherein the heat stabilizer is one of calcium zinc stabilizer or organic tin stabilizer, and the lubricant is one of paraffin wax, polyethylene wax and stearic acid.
4. The PVC-based corrosion-resistant corrugated pipe of claim 1, wherein the flame retardant component is prepared by the steps of:
step A11, mixing xylene, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and benzaldehyde, and heating and refluxing for 5 hours at the temperature of 125 ℃ to obtain an intermediate 1;
step A12, mixing the intermediate 1 and dioxane, then dropwise adding silicon tetrachloride, controlling the temperature of a reaction system to be not higher than 20 ℃ in the dropwise adding process, and after the dropwise adding is finished, carrying out heat preservation reaction for 6 hours at the temperature of 30 ℃ to obtain an intermediate 2;
and A13, mixing the intermediate 2 and dioxane, adding deionized water, heating to 60 ℃, reacting for 4 hours, adding melamine to adjust the pH value to 6, and then carrying out reduced pressure distillation to remove dioxane to obtain the flame-retardant component.
5. The PVC-based corrosion-resistant corrugated pipe according to claim 4, wherein the amount ratio of xylene, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and benzaldehyde in step A11 is 100 mL: 0.04 mol: 0.05 mol; in the step A12, the dosage ratio of the intermediate 1, dioxane and silicon tetrachloride is 6.5 g: 1.8 g: 80 mL; the dosage ratio of the intermediate 2, dioxane and deionized water in the step A13 is 37 g: 100mL of: 2g of the total weight.
6. The process for producing a PVC based corrosion resistant corrugated pipe according to claim 1, comprising the steps of:
firstly, putting the raw materials into a hot mixing cylinder of a mixer unit, starting high-speed stirring, and discharging the materials into a cold mixing cylinder for stirring and cooling when the temperature of the hot mixing cylinder reaches 125-135 ℃; stopping stirring when the temperature of the cold mixing cylinder is reduced to be below 55 ℃ to obtain a mixed material;
and secondly, adding the mixed material into an extruder for plasticizing, molding and cutting to obtain the PVC-based corrosion-resistant corrugated pipe.
7. The process for producing corrosion-resistant corrugated PVC-based pipe as claimed in claim 6, wherein the temperature of the extruder barrel is set at 190 ℃ and the molding temperature is set at 200 ℃ and 170 ℃.
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