CN115536961A - High thermal stability's blow off pipe - Google Patents
High thermal stability's blow off pipe Download PDFInfo
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- CN115536961A CN115536961A CN202211260881.1A CN202211260881A CN115536961A CN 115536961 A CN115536961 A CN 115536961A CN 202211260881 A CN202211260881 A CN 202211260881A CN 115536961 A CN115536961 A CN 115536961A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention relates to a drain pipe with high thermal stability, belonging to the technical field of drain pipe preparation, and comprising the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 15-30 parts of modified nano calcium carbonate, 1.5-3 parts of migration-resistant heat stabilizer, 2-6 parts of impact modifier, 1-3 parts of antioxidant and 1-1.5 parts of lubricant; the self-made migration-resistant heat stabilizer is used for replacing a traditional zinc-calcium heat stabilizer, and modified calcium carbonate acting reinforcing particles are added, wherein the migration-resistant heat stabilizer not only has the same characteristics (HCl is neutralized and unstable chlorine atoms are replaced) as the traditional calcium-zinc heat stabilizer, but also has excellent migration resistance, the modified calcium carbonate not only has a toughening effect on a pipe matrix, but also can be complexed with metal chloride formed after hydrogen chloride is absorbed by the migration-resistant heat stabilizer, the metal chloride is inhibited from promoting PVC decomposition, the zinc burning phenomenon is inhibited, and the heat stability of the sewage pipe is further improved.
Description
Technical Field
The invention belongs to the technical field of sewage pipe preparation, and particularly relates to a sewage pipe with high thermal stability.
Background
Polyvinyl chloride (PVC) is prepared by free radical polymerization of vinyl chloride monomer, and can be used for preparing hard products and soft products meeting different purposes by adding proper auxiliaries. PVC has the unique properties of high strength, corrosion resistance, flame retardancy, insulation, transparency, good compatibility with various plastic additives in a wide range and the like, is widely applied to pipe products, and is particularly widely used as a blow-off pipe.
However, PVC is white powder with an amorphous structure, has a small branching degree, starts to decompose at a glass transition temperature of 77-90 ℃, starts to decompose at about 170 ℃, has poor stability to light and heat, decomposes at a temperature of above 100 ℃ or after being exposed to sunlight for a long time to generate hydrogen chloride, further automatically catalyzes and decomposes to cause discoloration, and rapidly reduces physical and mechanical properties.
Therefore, it is necessary to provide a polyvinyl chloride sewage pipe with high thermal stability.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a sewage draining pipe with high thermal stability.
The purpose of the invention can be realized by the following technical scheme:
a sewage discharge pipe with high thermal stability comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 15-30 parts of modified nano calcium carbonate, 1.5-3 parts of migration-resistant heat stabilizer, 2-6 parts of impact modifier, 1-3 parts of antioxidant and 1-1.5 parts of lubricant;
the drain pipe with high thermal stability is prepared by the following steps:
adding polyvinyl chloride, modified nano calcium carbonate, a migration-resistant heat stabilizer, an impact modifier, an antioxidant and a lubricant into a high-speed stirrer, mixing at the rotating speed of 1000-1500r/min, setting the initial temperature of a charging barrel to 105 ℃, starting heating, putting the charging barrel into a low-speed stirrer when the temperature of a mixed material in the charging barrel reaches 120 ℃, cold-mixing and stirring at the rotating speed of 300-500r/min until the temperature of the mixed material is reduced to 45 ℃, discharging, transferring the obtained material into a double-screw extruder, and carrying out extrusion molding to obtain the drain pipe with high thermal stability.
Further, the migration-resistant heat stabilizer is prepared by the following steps
Step S11, adding maleic anhydride into a four-neck flask, melting solid maleic anhydride under the conditions of heating and mechanical stirring, heating to 100-130 ℃, adding pentaerythritol, and reacting for 4-6 hours under mechanical stirring to obtain an intermediate product a, wherein the molar ratio of maleic anhydride to pentaerythritol is 1:4.3-4.5, using maleic anhydride and pentaerythritol as substrates, and obtaining an intermediate product a containing ester groups, carbon-carbon double bonds and terminal carboxyl groups through esterification reaction;
step S12, placing the four-neck flask containing the intermediate product a into a 120 ℃ oil bath, slowly dropwise adding a calcium acetate aqueous solution and a zinc acetate aqueous solution while stirring, reacting for 3-4 hours while stirring after dropwise adding, removing water by rotary evaporation after reaction, and removing acetic acid by reduced pressure distillation until no liquid is distilled out to obtain a migration-resistant heat stabilizer, wherein the mass ratio of the intermediate product a to the calcium acetate to the zinc acetate is 15.1-16.3:9.68:12.07, the intermediate product a is used for reacting with calcium acetate and zinc acetate to obtain the migration-resistant heat stabilizer containing an ester group, a carbon-carbon double bond and a carboxylate structure.
Further, the modified calcium carbonate is prepared by the following steps:
adding deionized water, absolute ethyl alcohol and ethyl aluminum ethyl acetoacetate diisopropyl ester into a reaction kettle, stirring for 10min, heating to 60 ℃, adding nano calcium carbonate, continuously stirring for 30-60min under the protection of nitrogen, after the reaction is finished, performing suction filtration, drying a filter cake, placing the filter cake into the reaction kettle, adding tetrahydrofuran, stirring for 10-15min, adding modified ricinoleate and azobisisobutyronitrile, heating to reflux reaction for 3-4h, and after the reaction is finished, performing rotary evaporation to remove a solvent to obtain modified calcium carbonate;
wherein the dosage ratio of the deionized water, the absolute ethyl alcohol, the ethyl aluminum ethyl acetoacetate diisopropyl ester, the nano calcium carbonate, the modified ricinoleate and the azobisisobutyronitrile is 20-30mL:50-60mL:2g:25-30g:6.3-8.4g:0.2g.
The invention firstly utilizes ethyl aluminum diisopropyl acetoacetate to modify the surface of nano calcium carbonate and introduce unsaturated double bonds, and then enters modified ricinoleate on the surface of the calcium carbonate through the polymerization grafting reaction of the unsaturated double bonds under the action of an initiator to obtain modified calcium carbonate, which has the toughening effect on a tubular product matrix and simultaneously plays a role in improving the thermal stability of the matrix, wherein the toughening effect is on one hand the reinforcing effect of inorganic calcium carbonate, and on the other hand, the ricinoleate grafted on the surface of the tubular product matrix belongs to a vegetable oil-based plasticizer, and has the molecular weight larger than that of an o-benzene plasticizer, small mobility and good plasticizing effect; the improvement of the thermal stability is that the inorganic calcium carbonate can absorb HCl generated by PVC heating, and the modified ricinoleate molecular chain contains a plurality of epoxy groups and hydroxyl groups, the epoxy groups can absorb HCl generated by PVC thermal decomposition and displace unstable chlorine atoms, and the hydroxyl groups can be complexed with metal chlorides formed after the migration-resistant heat stabilizer absorbs hydrogen chloride, so that the metal chlorides are inhibited from promoting PVC decomposition, and the phenomenon of 'zinc burning' is inhibited.
Further, the modified ricinoleic acid ester is prepared by the following steps:
s21, placing pentaerythritol and ricinoleic acid in a reactor, adding a solid catalyst SO under the protection of nitrogen gas 4 2- /TiO 2 Stirring at 140 ℃ for reaction for 3-4h, then changing into a pressure reduction reaction device, vacuumizing at 140 ℃ for 2h to obtain an intermediate product b, mixing the intermediate product b, phosphoric acid and formic acid, dropwise adding 30wt% of hydrogen peroxide at 50 ℃, after dropwise adding, keeping the temperature for reaction for 3-4h, after the reaction is finished, washing the product with distilled water for 3 times, and performing rotary evaporation at 50 ℃ to obtain epoxy ricinoleic acid ester;
wherein, pentaerythritol, ricinoleic acid and solid catalyst SO 4 2- /TiO 2 The dosage ratio of the components is 18.2-23g:298g:2.8-2.9g; the mass ratio of the intermediate product b, phosphoric acid, formic acid and 30wt% hydrogen peroxide is 80:1:15:60-66, carrying out esterification reaction on pentaerythritol and ricinoleic acid under the action of a solid catalyst, and then carrying out epoxidation reaction;
step S22, mixing epoxy ricinoleate, 4-vinylaniline and toluene, adding p-benzoquinone, heating to 100-110 ℃, stirring for reaction for 5-6h, after the reaction is finished, carrying out reduced pressure distillation to remove toluene, washing a distillation product with hot water at 50-80 ℃, and drying to obtain modified ricinoleate;
wherein the dosage ratio of the epoxy ricinoleate to the 4-vinylaniline to the toluene is 12.5-13.8g:3.5-4.2g:200-300mL of p-benzoquinone, wherein the dosage of the p-benzoquinone is 0.1-0.2 percent of the mass sum of the epoxy ricinoleate and the 4-vinylaniline, and the epoxy group of the epoxy ricinoleate and the amino group of the 4-vinylaniline are subjected to ring-opening reaction to obtain ricinoleate containing unsaturated double bonds, epoxy groups and hydroxyl groups.
Further, the impact modifier is one or more of CPE (chlorinated polyethylene), ACR (acrylate copolymer) and MBS (methyl methacrylate-butadiene-styrene terpolymer) in any ratio.
Further, the antioxidant is one or more of antioxidants 1010, 1076 and 168 in any proportion.
Further, the lubricant is one or more of paraffin, polyethylene wax, stearic acid and calcium stearate which are combined according to any proportion.
The invention has the beneficial effects that:
the invention provides a high-thermal-stability drain pipe, wherein a self-made migration-resistant heat stabilizer is used for replacing a traditional calcium-zinc heat stabilizer, and modified calcium carbonate acting reinforcing particles are added, wherein the migration-resistant heat stabilizer not only has the same characteristics (HCl is neutralized and unstable chlorine atoms are replaced) as the traditional calcium-zinc heat stabilizer, but also has excellent migration resistance, and the first point is that the migration-resistant heat stabilizer is characterized by a macromolecular structure and is not easy to migrate; the second point is that a plurality of ester groups exist in the heat stabilizer, so that the compatibility of the heat stabilizer and a PVC matrix is improved; the third point is that the carbon-carbon double bond in the molecular structure can be added with the conjugated double bond in the PVC to form a saturated macromolecular chain, so that the aim of preventing the conjugated polyene chain from growing is fulfilled, the heat stabilizer can be anchored in the PVC matrix through a chemical bond, and the stability of the heat stabilizer in the matrix is improved; therefore, the modified calcium carbonate has a toughening effect on a pipe substrate, can be complexed with metal chloride formed after hydrogen chloride is absorbed by a migration-resistant heat stabilizer, inhibits the metal chloride from promoting PVC decomposition, inhibits the phenomenon of zinc burning, and further improves the thermal stability of the sewage 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.
Solid catalyst SO 4 2- /TiO 2 Is prepared by reference to the literature (Zhangqi, changjie, king iron military, etc., solid acid catalyst SO 4 2- /Si 2 -TiO 2 Preparation and catalytic esterification performance of [ J]Catalytic journal, 2006,27 (11): 1033-1038).
Example 1
The migration-resistant heat stabilizer is prepared by the following steps
S11, adding 9.8g of maleic anhydride into a four-neck flask, melting solid maleic anhydride under the conditions of heating and mechanical stirring, then heating to 100 ℃, adding 58.54g of pentaerythritol, and carrying out mechanical stirring reaction for 4 hours to obtain an intermediate product a;
and S12, placing the four-neck flask containing 15.1g of the intermediate product a into a 120 ℃ oil bath kettle, slowly dropwise adding 50mL of calcium acetate aqueous solution containing 9.68g of calcium acetate and 50mL of zinc acetate aqueous solution containing 12.07g of zinc acetate while stirring, after dropwise adding, stirring for reacting for 3 hours, performing rotary evaporation to remove water, and performing reduced pressure distillation to remove acetic acid until no liquid is distilled out, thereby obtaining the migration-resistant heat stabilizer.
Example 2
The migration-resistant heat stabilizer is prepared by the following steps
S11, adding 9.8g of maleic anhydride into a four-neck flask, melting solid maleic anhydride under the conditions of heating and mechanical stirring, then heating to 130 ℃, adding 61.2g of pentaerythritol, and carrying out mechanical stirring reaction for 6 hours to obtain an intermediate product a;
and step S12, placing the four-neck flask containing 16.3g of the intermediate product a into a 120 ℃ oil bath, slowly dropwise adding 50mL of calcium acetate aqueous solution containing 9.68g of calcium acetate and 50mL of zinc acetate aqueous solution containing 12.07g of zinc acetate while stirring, reacting for 4 hours while stirring after dropwise adding is finished, removing water by rotary evaporation, and removing acetic acid by reduced pressure distillation until no liquid is distilled out to obtain the migration-resistant heat stabilizer.
Example 3
The modified calcium carbonate is prepared by the following steps:
adding 20mL of deionized water, 50mL of absolute ethyl alcohol and 2g of ethyl aluminum diisopropyl acetoacetate into a reaction kettle, stirring for 10min, heating to 60 ℃, adding 25g of nano calcium carbonate, continuing stirring for 30min under the protection of nitrogen, after the reaction is finished, performing suction filtration, drying a filter cake, placing the filter cake into the reaction kettle, adding 250mL of tetrahydrofuran, stirring for 10min, adding 6.3g of modified ricinoleate and 0.2g of azobisisobutyronitrile, heating to reflux for 3h, and performing rotary evaporation to remove the solvent to obtain the modified calcium carbonate.
The modified ricinoleic acid ester is prepared by the following steps:
step S21, placing 18.2g of pentaerythritol and 298g of ricinoleic acid in a reactor, adding 2.8g of solid catalyst SO under the protection of nitrogen gas 4 2- /TiO 2 Stirring and reacting for 3 hours at 140 ℃, then changing into a reduced pressure reaction device, vacuumizing for 2 hours at 140 ℃ to obtain an intermediate product b, mixing 80g of the intermediate product b, 1g of phosphoric acid and 15g of formic acid, dripping 60g of 30wt% hydrogen peroxide at 50 ℃, after dripping, preserving heat and reacting for 3 hours, washing the product with distilled water for 3 times, and carrying out rotary evaporation at 50 ℃ to obtain epoxy ricinoleic acid ester;
step S22, mixing 12.5g of epoxy ricinoleate, 3.5g of 4-vinylaniline and 200mL of toluene, adding p-benzoquinone, heating to 100 ℃, stirring for reaction for 5 hours, after the reaction is finished, distilling under reduced pressure to remove the toluene, washing a distillation product with hot water at 50 ℃, and drying to obtain the modified ricinoleate, wherein the dosage of the p-benzoquinone is 0.1 percent of the mass sum of the epoxy ricinoleate and the 4-vinylaniline.
Example 4
The modified calcium carbonate is prepared by the following steps:
adding 30mL of deionized water, 60mL of anhydrous ethanol and 2g of ethyl aluminum ethyl acetoacetate diisopropyl ester into a reaction kettle, stirring for 10min, heating to 60 ℃, adding 30g of nano calcium carbonate, continuously stirring for 60min under the protection of nitrogen, after the reaction is finished, performing suction filtration, drying a filter cake, placing the filter cake into the reaction kettle, adding 300mL of tetrahydrofuran, stirring for 15min, adding 8.4g of modified ricinoleate and 0.2g of azobisisobutyronitrile, heating to reflux reaction for 4h, and performing rotary evaporation to remove the solvent to obtain the modified calcium carbonate.
The modified ricinoleate is prepared by the following steps:
step S21, placing 23g of pentaerythritol and 298g of ricinoleic acid in a reactor, adding 2.9g of solid catalyst SO under the protection of nitrogen gas 4 2- /TiO 2 Stirring and reacting for 4 hours at 140 ℃, then changing into a decompression reaction device, vacuumizing for 2 hours at 140 ℃ to obtain an intermediate product b, mixing 80g of the intermediate product b, 1g of phosphoric acid and 15g of formic acid, dropwise adding 66g of 30wt% hydrogen peroxide at 50 ℃, after dropwise adding, preserving heat and reacting for 4 hours, washing the product for 3 times by using distilled water, and carrying out rotary evaporation at 50 ℃ to obtain epoxy ricinoleate;
and S22, mixing 13.8g of epoxy ricinoleate, 4.2g of 4-vinylaniline and 300mL of toluene, adding p-benzoquinone, heating to 110 ℃, stirring for reaction for 6 hours, distilling under reduced pressure to remove the toluene after the reaction is finished, washing a distilled product with hot water at 80 ℃, and drying to obtain the modified ricinoleate, wherein the dosage of the p-benzoquinone is 0.2 percent of the mass of the epoxy ricinoleate and the mass of the 4-vinylaniline.
Comparative example 1
The modified calcium carbonate is prepared by the following steps:
adding 30mL of deionized water, 60mL of absolute ethyl alcohol and 2g of ethyl aluminum ethyl acetoacetate diisopropyl into a reaction kettle, stirring for 10min, heating to 60 ℃, adding 30g of nano calcium carbonate, continuously stirring for 60min under the protection of nitrogen, after the reaction is finished, performing suction filtration, and drying a filter cake to obtain the modified calcium carbonate.
Example 5
A sewage discharge pipe with high thermal stability comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 15 parts of modified nano calcium carbonate in example 3, 1.5 parts of migration-resistant heat stabilizer in example 1, 2 parts of impact modifier, 1010 parts of antioxidant and 1 part of stearic acid;
the sewage draining pipe with high thermal stability is prepared by the following steps:
adding polyvinyl chloride, modified nano calcium carbonate, a migration-resistant heat stabilizer, an impact modifier, an antioxidant and a lubricant into a high-speed mixer, mixing at the rotating speed of 1000r/min, setting the initial temperature of a charging barrel to be 105 ℃, starting heating, when the temperature of a mixed material in the charging barrel reaches 120 ℃, putting the mixed material into a low-speed mixer for cold mixing and stirring, stirring at the rotating speed of 300r/min until the temperature of the mixed material is reduced to 45 ℃, discharging, transferring the obtained material into a double-screw extruder for extrusion molding, and obtaining a drain pipe with high thermal stability, wherein the rotating speed of a screw of the screw extruder is 45r/min, the temperatures of three sections of the screw are respectively 150 ℃, 175 ℃ and 185 ℃, and the temperature of a neck mold is 190 ℃.
Wherein the impact modifier is CPE.
Example 6
A sewage discharge pipe with high thermal stability comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 25 parts of modified nano calcium carbonate of example 4, 1.9 parts of migration-resistant heat stabilizer of example 1, 4 parts of impact modifier, 1010 parts of antioxidant and 1.3 parts of stearic acid;
the drain pipe with high thermal stability is prepared by the following steps:
adding polyvinyl chloride, modified nano calcium carbonate, a migration-resistant heat stabilizer, an impact modifier, an antioxidant and a lubricant into a high-speed mixer, mixing at the rotation speed of 1200r/min, setting the initial temperature of a charging barrel to be 105 ℃, starting heating, when the temperature of a mixed material in the charging barrel reaches 120 ℃, putting the mixed material into a low-speed mixer for cold mixing and stirring, stirring at the rotation speed of 400r/min until the temperature of the mixed material is reduced to 45 ℃, discharging, transferring the obtained material into a double-screw extruder for extrusion molding, and obtaining a drain pipe with high thermal stability, wherein the rotation speed of a screw of the screw extruder is 45r/min, the temperatures of three sections of the screw are respectively 150 ℃, 175 ℃ and 185 ℃, and the temperature of a neck mold is 190 ℃.
Wherein the impact modifier is CPE.
Example 7
A sewage discharge pipe with high thermal stability comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 30 parts of modified nano calcium carbonate of example 3, 3 parts of migration-resistant heat stabilizer of example 2, 6 parts of impact modifier, 1010 parts of antioxidant and 1.5 parts of stearic acid;
the drain pipe with high thermal stability is prepared by the following steps:
adding polyvinyl chloride, modified nano calcium carbonate, a migration-resistant heat stabilizer, an impact modifier, an antioxidant and a lubricant into a high-speed mixer, mixing at the rotating speed of 1500r/min, setting the initial temperature of a charging barrel to be 105 ℃, starting heating, when the temperature of a mixed material in the charging barrel reaches 120 ℃, putting the mixed material into a low-speed mixer for cold mixing and stirring, stirring at the rotating speed of 500r/min until the temperature of the mixed material is reduced to 45 ℃, discharging, transferring the obtained material into a double-screw extruder for extrusion molding, and obtaining a drain pipe with high thermal stability, wherein the rotating speed of a screw of the screw extruder is 45r/min, the three-section temperature of the screw is respectively 150 ℃, 175 ℃ and 185 ℃, and the neck mold temperature is 190 ℃.
Wherein the impact modifier is CPE.
Comparative example 2
The migration resistant heat stabilizer in example 5 was replaced with a calcium zinc composite stabilizer sold by Changzhou Senlang chemical Co., ltd, and the other raw materials and preparation process were the same as in example 5.
Comparative example 3
The modified calcium carbonate of example 6 was substituted for the material of comparative example 1, and the remaining raw materials and preparation process were the same as in example 6.
The drain pipes prepared in examples 5 to 7 and comparative examples 2 to 3 were subjected to a test for migration resistance: taking the mass sheets such as the drain pipe, respectively placing the mass sheets in an acetic acid solution with the volume fraction of 30% and n-hexane, soaking the mass sheets for 24 hours at the temperature of 30 ℃, taking out the mass sheets, drying, and calculating the mass loss rate (%) of the sheets, wherein the lower the mass loss rate is, the better the migration resistance is, and the tensile strength is: testing according to GB/T1040.1-2006, wherein the tensile rate is 10mm/min, and the heat aging resistance is as follows: and (3) carrying out heat preservation treatment 168 in a heat aging oven at 135 ℃, testing the change rate of the tensile strength, wherein the lower the change of the tensile strength is, the better the heat stability is, and the Vicat softening point temperature is as follows: according to GB/T1633-2000, the test results are shown in Table 1:
TABLE 1
As can be seen from Table 1, the sewage pipes prepared in examples 5 to 7 have not only good mechanical properties but also high thermal stability, compared to comparative examples 2 to 3.
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 (8)
1. The sewage discharge pipe with high thermal stability is characterized by comprising the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 15-30 parts of modified nano calcium carbonate, 1.5-3 parts of migration-resistant heat stabilizer, 2-6 parts of impact modifier, 1-3 parts of antioxidant and 1-1.5 parts of lubricant;
wherein, the migration-resistant heat stabilizer is prepared by the following steps:
step S11, adding maleic anhydride into a four-neck flask, heating to melt the maleic anhydride, heating to 100-130 ℃, adding pentaerythritol, and mechanically stirring to react for 4-6 hours to obtain an intermediate product a;
and S12, placing the four-neck flask containing the intermediate product a into a 120-DEG C oil bath kettle, slowly dropwise adding a calcium acetate aqueous solution and a zinc acetate aqueous solution while stirring, and after dropwise adding, stirring and reacting for 3-4h to obtain the migration-resistant heat stabilizer.
2. A highly thermally stable sewage pipe according to claim 1 wherein the molar ratio of maleic anhydride to pentaerythritol in step S11 is 1:4.3-4.5.
3. The high thermal stability sewage pipe of claim 1, wherein the mass ratio of the intermediate product a to the calcium acetate to the zinc acetate in the step S12 is 15.1-16.3:9.68:12.07.
4. a thermally stable sewer pipe according to claim 1, wherein the modified calcium carbonate is prepared by the steps of:
mixing deionized water, absolute ethyl alcohol and ethyl aluminum diisopropyl acetoacetate, heating to 60 ℃, adding nano calcium carbonate, continuously stirring under the protection of nitrogen, after the reaction is finished, performing suction filtration, drying a filter cake, placing the filter cake into a reaction kettle, adding tetrahydrofuran, stirring, adding modified ricinoleate and azobisisobutyronitrile, and performing reflux reaction for 3-4 hours to obtain the modified calcium carbonate.
5. The sewage discharge pipe with high thermal stability as claimed in claim 4, wherein the dosage ratio of the deionized water, the absolute ethyl alcohol, the ethyl aluminum ethyl acetoacetate diisopropyl ester, the nano calcium carbonate, the modified ricinoleate and the azobisisobutyronitrile is 20-30mL:50-60mL:2g:25-30g:6.3-8.4g:0.2g.
6. A thermally stable soil release pipe as claimed in claim 4 wherein the modified ricinoleic acid ester is prepared by the steps of:
s21, placing pentaerythritol and ricinoleic acid in a reactor, adding a solid catalyst SO under the protection of nitrogen gas 4 2- /TiO 2 Stirring and reacting for 3-4h at 140 ℃, then replacing a pressure reduction reaction device, vacuumizing for 2h at 140 ℃ to obtain an intermediate product b, mixing the intermediate product b, phosphoric acid and formic acid, dropwise adding 30wt% of hydrogen peroxide at 50 ℃, after dropwise adding, preserving heat and reacting for 3-4h, after the reaction is finished, washing the product for 3 times by using distilled water, and performing rotary evaporation at 50 ℃ to obtain epoxy ricinoleate;
and S22, mixing the epoxy ricinoleate, the 4-vinylaniline and the toluene, adding p-benzoquinone, heating to 100-110 ℃, and stirring for reaction for 5-6 hours to obtain the modified ricinoleate.
7. A sewage pipe with high thermal stability as claimed in claim 6, wherein in step S21, pentaerythritol, ricinoleic acid, solid catalyst SO 4 2- /TiO 2 The dosage ratio of (A) is 18.2-23g:298g:2.8-2.9g; the mass ratio of the intermediate product b, phosphoric acid, formic acid and 30wt% hydrogen peroxide is 80:1:15:60-66.
8. A thermal stability sewage pipe as claimed in claim 6, wherein the dosage ratio of ricinoleic acid ester, 4-vinylaniline and toluene in step S22 is 12.5-13.8g:3.5-4.2g:200-300mL, and the dosage of p-benzoquinone is 0.1-0.2 percent of the mass sum of the epoxy ricinoleate and the 4-vinylaniline.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3567669A (en) * | 1967-08-04 | 1971-03-02 | Diamond Shamrock Corp | Preparation of rigid polyvinyl chloride particles having a high bulk density |
| CN1807519A (en) * | 2006-01-27 | 2006-07-26 | 华南理工大学 | Modified nanometer calcium carbonate and method for making same and uses |
| CN115073861A (en) * | 2022-07-15 | 2022-09-20 | 安徽瑞丰管业有限公司 | Anti-tensile polyvinyl chloride communication pipe and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3567669A (en) * | 1967-08-04 | 1971-03-02 | Diamond Shamrock Corp | Preparation of rigid polyvinyl chloride particles having a high bulk density |
| CN1807519A (en) * | 2006-01-27 | 2006-07-26 | 华南理工大学 | Modified nanometer calcium carbonate and method for making same and uses |
| CN115073861A (en) * | 2022-07-15 | 2022-09-20 | 安徽瑞丰管业有限公司 | Anti-tensile polyvinyl chloride communication pipe and preparation method thereof |
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