CN113045843B - PVC composition and preparation method and application thereof - Google Patents
PVC composition and preparation method and application thereof Download PDFInfo
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- CN113045843B CN113045843B CN202110397226.XA CN202110397226A CN113045843B CN 113045843 B CN113045843 B CN 113045843B CN 202110397226 A CN202110397226 A CN 202110397226A CN 113045843 B CN113045843 B CN 113045843B
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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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- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
- B29C48/525—Conical screws
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/64—Screws with two or more threads
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a PVC composition, a preparation method and application thereof, wherein the composition comprises the following components in parts by weight: 80-100 parts of polyvinyl chloride resin; 40-80 parts of calcium carbonate; 0.5-1.0 part of high-melting-point polyethylene wax; 0.5-1.0 part of paraffin; 2-8 parts of a toughening agent; 2-4 parts of organic tin stabilizer; the composition is processed through a conical screw; the screw ridge spacing of the plasticizing section of the conical screw is 25-40 mm; the number of the shearing backflow sections of the conical screw is more than or equal to 12 sections; the composition provided by the invention has the advantages of low friction coefficient, good mechanical property, acid and alkali resistance and corrosion resistance. The roughness factor has a maximum value of 0.28 μm. Good mechanical property, acid and alkali resistance and corrosion resistance, and can be used for preparing the PVC blow-off pipe special for breeding.
Description
Technical Field
The invention relates to the technical field of engineering plastic modification, and in particular relates to a PVC (polyvinyl chloride) composition as well as a preparation method and application thereof.
Background
Polyvinyl chloride (PVC) pipes are widely used because of their light weight, excellent mechanical strength, chemical resistance, corrosion resistance, chemical resistance, heat insulation, electrical insulation, long life, and low cost, which are the main raw materials of PVC resins.
However, in the field of water supply, drainage and pollution discharge in the aquaculture industry, the PVC pipe often has the problems of corrosion, low pollution discharge efficiency and the like, and a novel pipe which is corrosion-resistant, smooth in inner and outer walls and small in friction coefficient is urgently needed; for example, chinese patent (CN 109337254A) discloses a PVC-U drainage pipe with a ceramic smooth inner wall, the pipe with the smooth inner wall can be obtained by filling talcum powder, but the minimum value of the surface roughness is only 0.347 mu m, and the PVC-U drainage pipe can be applied to general drainage pipes, but for the drainage pipe in the breeding industry, not only breeding excrement needs to be treated, but also other substances such as uneatened feed need to be treated, therefore, compared with other drainage pipes, the inner wall is easier to form dirt, the smaller the roughness of the drainage pipe is, the smoother the drainage pipe is, and therefore, when the minimum value of the surface roughness is only 0.347 mu m, the PVC-U drainage pipe cannot meet the drainage pipe in the breeding industry.
Disclosure of Invention
The invention provides a PVC composition for overcoming the defect that the PVC pipe is not smooth enough.
Another object of the present invention is to provide a process for the preparation of said PVC composition.
Another object of the present invention is to provide the use of said PVC composition.
In order to achieve the purpose, the invention adopts the technical scheme that:
a PVC composition comprises the following components in parts by weight:
the composition is processed through a conical screw; the screw ridge spacing of the plasticizing section of the conical screw is 25-40 mm;
the number of the shearing backflow sections of the conical screw is more than or equal to 12 sections.
Firstly, adding a toughening agent and a weather resisting agent to improve the mechanical property, acid and alkali resistance and corrosion resistance of the PVC composition, and improving the smoothness by adopting the interaction of a high-melting point lubricant polyethylene wax and a low-melting point lubricant paraffin wax; the paraffin acts on the earlier stage of plasticization, and in the stages of high-speed mixing of the composition and conversion of extruded powder into melt, the internal friction force between the compositions is eliminated, and the composition is pre-plasticized and has a certain plasticizing and fusing effect. The high-melting-point polyethylene wax acts on the middle and later stages of plasticization, and can further eliminate the acting force between melts and the friction force between the melts and the mold before forming, so that the melts can be slowly extruded (i.e. stay for a long time) under high temperature and high pressure of a larger mold without causing PVC decomposition. The fluidity and the uniform stability of the blank after the die is discharged are enhanced, the roughness coefficient of the PVC composition is reduced, and the smoothness is further improved.
On the other hand, the inventor further reduces the roughness coefficient by adjusting parameters of the conical screw, wherein the screw pitch of the plasticizing segment of the conical screw is adjusted to be 25-40 mm.
The inventor finds that the screw pitch of the conventional plasticizing section is between 15 and 20mm, the plasticizing capability is strong, and the PVC composition of the invention is easy to be over-plasticized, so that the PVC resin is decomposed, and the roughness coefficient is increased; in addition, excessive plasticization tends to consume lubricant in the composition, resulting in insufficient lubricant during later shearing of the composition, resulting in reduced smoothness.
The number of the shearing backflow sections of the conical screw is more than or equal to 12 sections. The inventors found that the kneading effect is good in this range, thereby ensuring the performance.
The screw structure is including plastify section, end material valve 1.5 circle, shearing backward flow section, charge valve 1.5 circle and compression measurement section.
The number of the shear return sections cannot be too large, and the effect cannot be improved by increasing the number after the maximum effect is achieved, and therefore, it is preferable that the number of the shear return sections of the conical screw is 15 or less.
Preferably, the melting point of the high-melting-point polyethylene wax is 100-120 ℃.
When the melting point of the high-melting-point polyethylene wax is 100-120 ℃, the melting and consumption of the high-melting-point polyethylene wax in the early mixing stage of the screw rod are prevented.
Preferably, the paraffin wax has a melting point of 52 to 60 ℃.
Preferably, the toughening agent is MBS and/or CPE.
When the toughening agent is MBS and/or CPE, the toughening effect is obvious and the mechanical property is good.
Preferably, the PVC composition further comprises an antioxidant and/or a weather resistant agent.
More preferably, the antioxidant is 0.01 to 0.03 part by weight; 0.01-0.03 part of weather resistant agent.
More preferably, the antioxidant is a hindered phenolic antioxidant.
More preferably, the weather resistant agent is rutile type titanium dioxide or an ultraviolet absorber.
Preferably, the polyvinyl chloride resin has a weight average molecular weight of 6 to 8 ten thousand.
The preparation method of the PVC composition comprises the following steps:
s1, weighing polyvinyl chloride resin, calcium carbonate, high-melting-point polyethylene wax, paraffin, a toughening agent, an organic tin stabilizer, a weather-resistant agent and an antioxidant according to a proportion, and blending uniformly to obtain a premix;
and S2, extruding and molding the premix obtained in the step S1 to obtain the PVC composition.
A PVC pipe material containing the PVC composition.
The PVC composition is applied to PVC pipes, and the pipes have the advantages of low friction coefficient, corrosion resistance and acid and alkali resistance. Can be used for preparing a PVC blow-off pipe special for cultivation.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a PVC composition, which has low friction coefficient, good mechanical property, corrosion resistance, acid and alkali resistance; wherein, the high-melting point lubricant and the low-melting point lubricant paraffin wax are adopted to ensure the lubricating performance in the whole screw processing process and reduce the roughness coefficient; and adjusting the parameters of the conical screw through which the composition is processed; the screw ridge spacing of the plasticizing section of the conical screw is 25-40 mm; the number of the shearing backflow sections of the conical screw is more than or equal to 12 sections, so that the roughness coefficient is further reduced, and the maximum value of the roughness coefficient is 0.28 mu m. Good mechanical property, acid and alkali resistance and corrosion resistance, and can be used for preparing special PVC blow-off pipes for breeding.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, but the embodiments of the present invention are not limited thereto.
The reagents, methods and equipment adopted by the invention are conventional in the technical field if no special description is given.
The following examples and comparative examples employ the following starting materials:
polyvinyl chloride resin: zhongtai group, SG-5;
calcium carbonate: guangxi Jinshan, light stone powder;
high-melting-point polyethylene wax A: the melting point is 100 ℃,
high-melting polyethylene wax B: melting point 110 ℃, qingdao Boniu chemical industry, BN208;
high-melting polyethylene wax C: melting point 120 ℃, german hangao, 78S;
paraffin A: melting point 52 ℃, paraffin 52, daqing refining;
paraffin wax B: melting point 56 ℃, paraffin 56, daqing refining;
paraffin C: melting point is 60 ℃, paraffin is 60, daqing refining is carried out;
toughening agent: MBS: brillouin B-564;
organic tin stabilizers: non-toxic and environment-friendly organotin 181 in the Yunnan stannum industry;
antioxidant: cyanohydrin, UV-3853PP5;
weather resisting agent: nanjing titanium dioxide, NR950.
The extruder was purchased from model 92 of Guangdong co-plasticator manufacturing Co., ltd; the screw structure is including plastify section, material stop valve 1.5 circles, shearing backward flow section, feed valve 1.5 circles and compression measurement section.
The PVC compositions of the examples and comparative examples were prepared by a process comprising the steps of:
s1, weighing polyvinyl chloride resin, calcium carbonate, high-melting-point polyethylene wax, paraffin, a toughening agent, an organic tin stabilizer, a weather-resistant agent and an antioxidant according to a proportion, and blending uniformly to obtain a premix;
s2, extruding and molding the premix obtained in the step S1 to obtain the PVC composition.
Examples 1 to 5
This example provides a series of PVC compositions, the specific formulations of which are set forth in Table 1;
TABLE 1 formulations of examples 1-5
Examples 6 to 10
This example provides a series of PVC compositions, the specific formulations of which are set forth in Table 2;
TABLE 2 formulations for examples 6 to 10
| Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | |
| Polyvinyl chloride resin | 90 | 90 | 90 | 90 | 90 |
| Calcium carbonate | 50 | 50 | 50 | 50 | 50 |
| High-melting-point polyethylene wax B | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Paraffin B | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Toughening agent | 3 | 3 | 3 | 3 | 3 |
| Organotin stabilizers | 3 | 3 | 3 | 3 | 3 |
| Antioxidant agent | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 |
| Weather-resistant agent | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 |
| Screw pitch of plasticized segment (mm) | 25 | 35 | 40 | 30 | 30 |
| Number of shear return sections (sections) | 12 | 12 | 12 | 15 | 18 |
Examples 11 to 12 and comparative examples 1 to 3
The examples and comparative examples provide a series of PVC compositions, the specific formulations are set forth in Table 3;
TABLE 3 formulations of examples 1 to 2 and comparative examples 1 to 3
The PVC compositions of the above examples and comparative examples were each tested for performance by the following method:
roughness coefficient: refer to JJF 1105-2018 stylus type surface roughness measurement instrument calibration Specification;
mechanical properties: referring to national standard GB/T5836.1, a drop hammer tester is adopted, hammers DN90,3kg,2m and 23 ℃ are adopted, the length of a sample is 200mm, 5 sample tubes are detected, and each sample tube is subjected to an impact test by a clockwise rotation method, namely 8 points are evenly distributed according to 360 points;
corrosion resistance, acid and alkali resistance: respectively using concentrated sulfuric acid with PH2-3 and potassium hydroxide with PH11-12 to carry out corrosion experiment detection on the sample block, and classifying and expressing the corrosion resistance of the plastic products by a corrosion resistance table: a does not corrode, B does not substantially corrode, C is dangerous, D corrodes.
TABLE 4 data for examples and comparative examples
From comparative examples 1 to 3, it was found that the effect of a low coefficient of roughness could not be achieved without increasing the melting point of polyethylene wax, paraffin wax or adjusting the pitch of the screw ridges in the plasticizing zone.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The PVC composition is characterized by comprising the following components in parts by weight:
the composition is processed by a conical screw, and the screw ridge spacing of a plasticizing section of the conical screw is 25-40 mm;
the number of the shearing backflow sections of the conical screw is more than or equal to 12 sections;
the melting point of the high-melting-point polyethylene wax is 100-120 ℃; the melting point of the paraffin is 52-60 ℃.
2. The PVC composition of claim 1, wherein the number of shear return sections of the conical screw is 15 or less.
3. The PVC composition of claim 1, wherein the toughening agent is MBS and/or CPE.
4. The PVC composition of claim 1, further comprising an antioxidant and/or a weathering agent.
5. The PVC composition of claim 4, wherein the weather resistant agent is rutile titanium dioxide or an ultraviolet absorber.
6. The PVC composition according to claim 1, wherein the polyvinyl chloride resin has a weight average molecular weight of 6 to 8 ten thousand.
7. A process for the preparation of a PVC composition according to any one of claims 1 to 3, characterized in that it comprises the following steps:
s1, weighing polyvinyl chloride resin, calcium carbonate, high-melting-point polyethylene wax, paraffin, a toughening agent and an organic tin stabilizer according to a proportion, and blending uniformly to obtain a premix;
and S2, extruding and molding the premix obtained in the step S1 to obtain the PVC composition.
8. PVC pipe, characterized in that it is made from the PVC composition according to any one of claims 1 to 6.
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| CN202110397226.XA CN113045843B (en) | 2021-04-13 | 2021-04-13 | PVC composition and preparation method and application thereof |
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| CN202110397226.XA CN113045843B (en) | 2021-04-13 | 2021-04-13 | PVC composition and preparation method and application thereof |
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| JPS63291632A (en) * | 1987-05-25 | 1988-11-29 | Mitsubishi Heavy Ind Ltd | Plasticized screw |
| CN2645185Y (en) * | 2003-04-28 | 2004-09-29 | 珠海宇讯同轴电缆有限公司 | Screw bolt |
| CN100417687C (en) * | 2004-06-08 | 2008-09-10 | 河北宝硕管材有限公司 | Production process of antibiotic hard polyvinyl chloride water pipe |
| JP2008238806A (en) * | 2007-02-27 | 2008-10-09 | Toyobo Co Ltd | Roll of polypropylene based resin laminated film and producing method for it |
| CN101775180B (en) * | 2009-12-29 | 2012-06-20 | 山东华信塑胶股份有限公司 | Impact-resistant modified polyvinyl chloride tube material and preparation process thereof |
| CN102863712B (en) * | 2011-07-06 | 2014-12-10 | 中国石油化工股份有限公司 | High shock resistant PVC tubular product and preparation method thereof |
| CN106046623A (en) * | 2016-07-29 | 2016-10-26 | 大禹节水（天津）有限公司 | Smooth-inner-wall-type PVC pipe |
| CN107474430A (en) * | 2017-08-16 | 2017-12-15 | 山东霞光实业有限公司 | A kind of PVC Modified wood plastic section bars of door and window and preparation method thereof |
| CN108676280A (en) * | 2018-05-08 | 2018-10-19 | 张家港市利奇塑料有限公司 | A kind of foam process of composite floor substrate |
| CN108705756A (en) * | 2018-06-14 | 2018-10-26 | 浙江光明塑料机械有限公司 | A kind of extrusion screw rod |
| CN208375653U (en) * | 2018-06-25 | 2019-01-15 | 舟山市金塘螺杆电子商务有限公司 | A kind of parallel double-screw extruder |
| CN109096646A (en) * | 2018-07-26 | 2018-12-28 | 江苏瑞亚特装饰材料有限公司 | PVC hard substrate and preparation method thereof and PVC hard composite floor board |
| DE102019118086A1 (en) * | 2019-07-04 | 2021-01-07 | Nidec Gpm Gmbh | Integrated screw spindle coolant pump |
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