CN104999642A - Preparation technology for extra-large-caliber chlorinated polyvinyl chloride pipe - Google Patents

Preparation technology for extra-large-caliber chlorinated polyvinyl chloride pipe Download PDF

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Publication number
CN104999642A
CN104999642A CN201510325925.8A CN201510325925A CN104999642A CN 104999642 A CN104999642 A CN 104999642A CN 201510325925 A CN201510325925 A CN 201510325925A CN 104999642 A CN104999642 A CN 104999642A
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China
Prior art keywords
annular distance
die body
polyvinyl chloride
water conservancy
conservancy diversion
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CN201510325925.8A
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Chinese (zh)
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CN104999642B (en
Inventor
林华义
赵崇强
肖玉刚
胡旭阳
南雷
赵旭磊
林益
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YOULI HOLDING GROUP CO Ltd
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YOULI HOLDING GROUP CO Ltd
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Priority to CN201510325925.8A priority Critical patent/CN104999642B/en
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Classifications

    • 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
    • B29C48/30—Extrusion nozzles or dies
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles

Abstract

The invention discloses a preparation technology for an extra-large-caliber chlorinated polyvinyl chloride pipe. The preparation technology for the extra-large-caliber chlorinated polyvinyl chloride pipe comprises the following working procedures that chlorinated polyvinyl chloride particles are taken as a raw material, through high-temperature plasticization, extrusion injection molding, vacuum sizing, cooling and cutting, the extra-large-caliber chlorinated polyvinyl chloride pipe is prepared, the extrusion injection molding adopts a special purpose extrusion molding mold, the special purpose extrusion molding mold comprises a main mold body and a molding mold body fixedly arranged on the main mold body, and the temperature differences of the chlorinated polyvinyl chloride in positions of all sections in the main mold body and the molding mold body are not larger than three degree centigrade. The preparation technology for the extra-large-caliber chlorinated polyvinyl chloride pipe has the advantages that the technology can be suitable for machining chlorinated polyvinyl chloride pipes with extra-large calibers of above DN600.

Description

A kind of preparation technology of super-large diameter chlorinated polyvinyl chloride pipe
Technical field
The invention belongs to a kind of preparation field of plastic pipe, specifically refer to a kind of preparation technology of super-large diameter chlorinated polyvinyl chloride pipe.
Background technology
PVC-C(chlorinated polyvinyl chloride second is rare) model engineering plastic is a kind of new material with three large key properties such as high strength, high temperature resistant, strong acid-base resistances.Its preparation technology is generated by the chlorination of PVC free radical with PVC-C chliorinated polyvinyl chloride raw material: PVC-C, and general chlorinity is 63%-69%, and its chlorination reaction process is as follows: start: Cl 2→ 2Cl; Increasing is spread out: RH+HCl → R+HCl; R+Cl 2→ RCl+Cl; Stop: R+Cl → RCl; Cl+Cl → Cl 2; R+R → R 2.(RH represents PVC, → represent heating).
The rare performance in order to ensure its high strength, high temperature resistant, strong acid-base resistance of chlorinated polyvinyl chloride second, its chlorinity generally wants more than 63%, cause the rare processing characteristics of chlorinated polyvinyl chloride second poor, large-caliber product is shaping more difficult, the bore that the national standard published for 2003, iso standard are only compiled, American Standard is also only accomplished.Maximum caliber is only accomplished in the world at present.More and more urgent to the demand of super-large diameter CPVC tubing on domestic and international market.
Summary of the invention
The object of the invention is the shortcoming and defect existed to overcome prior art, and a kind of preparation technology of super-large diameter chlorinated polyvinyl chloride pipe is provided, can be applicable to by this technique the super-large diameter chlorinated polyvinyl chloride pipe processing more than DN600.
For achieving the above object, technical scheme of the present invention includes following operation: with chliorinated polyvinyl chloride particle for raw material, plastify through high temperature, extrusion molding, Vacuum shaping, cooling, be cut into, described extrusion molding adopts special extrusion molding mould, this special extrusion molding mould includes main die body and is fixedly installed on the shaping die body on main die body, this shaping die body to be provided with for super-large diameter chlorinated polyvinyl chloride pipe and diameter is the extrusion moulding annular distance of more than 600mm, one end of described main die body is provided with charging hole, be communicated with relative to the inner of charging hole in main die body and be provided with tapered water conservancy diversion annular distance, the tapered top of water conservancy diversion annular distance is connected with the inner of charging hole, be communicated with relative to the rear end of tapered water conservancy diversion annular distance in described main die body and be provided with transition water conservancy diversion annular distance, the leading portion of this transition water conservancy diversion annular distance is connected and the two equal diameters with the back segment of tapered water conservancy diversion annular distance, the rear end of this transition water conservancy diversion annular distance is connected with the inner of extrusion moulding annular distance, the orient diameter that the back segment of this transition water conservancy diversion annular distance flows to extrusion moulding annular distance according to material reduces setting gradually, described charging hole, tapered water conservancy diversion annular distance, the central shaft of transition water conservancy diversion annular distance and the central shaft of main die body coincide, described main die body is provided with the first thermal medium chamber relative to the center of tapered water conservancy diversion annular distance and transition water conservancy diversion annular distance, this thermal medium chamber includes and is communicated with successively and the small size cylindrical cavity of mutual concentricity axle in direction to the back-end from the front end of main die body, middle volume barrel mast chamber and large volume cylindrical cavity, and this small size cylindrical cavity, the central shaft of middle volume barrel mast chamber and large volume cylindrical cavity and the central shaft of main die body coincide, described shaping die body is provided with the second thermal medium cylindrical cavity relative to the center of extrusion moulding annular distance, the inner of this second thermal medium cylindrical cavity is connected with the rear end of large volume cylindrical cavity, and the volume of the second thermal medium cylindrical cavity is greater than the volume of large volume cylindrical cavity, the each fragment position temperature difference of described chliorinated polyvinyl chloride in main die body and shaping die body is not more than 3 degrees Celsius.
Further setting is chliorinated polyvinyl chloride particle through high-speed mixer prebake before high temperature plasticizing, and its bake out temperature and time should control within 80 ± 2 DEG C, 10 ± 0.1 minutes.
Innovation Mechanism of the present invention and beneficial effect are:
The present inventor found the super-large diameter chlorinated polyvinyl chloride pipe development stage, the central factor limiting super-large diameter chlorinated polyvinyl chloride pipe shaping is: the processing characteristic rare due to chlorinated polyvinyl chloride second is poor, and stability of material is not enough, when carrying out super-large diameter chlorinated polyvinyl chloride pipe shaping, when flowing in the extrusion molding dies of chliorinated polyvinyl chloride, can cool gradually, and this temperature lowering curve is difficult to control, thus cause each section of temperature difference of extrusion molding dies can find larger change, and fatal be, when the chliorinated polyvinyl chloride temperature difference everywhere is in a mold more than 3 DEG C, material will decompose.
The present invention is based on this discovery, above-mentioned specialized designs is carried out to special extrusion molding mould, and design pod apertures and the heat medium cavity of coupling mutually, thus utilize the temperature of heating agent to control, can be ideal and the temperature difference stably achieving each section of mould is no more than 3 degrees Celsius, thus achieve the preparation of the super-large diameter chlorinated polyvinyl chloride pipe of more than DN600, very well meet.To the active demand of super-large diameter CPVC tubing on domestic and international market, obtain extraordinary economic benefit
Below in conjunction with specification drawings and specific embodiments, the present invention is described further.
Accompanying drawing explanation
Fig. 1 specific embodiment of the invention structural representation.
Detailed description of the invention
Below by embodiment, the present invention is specifically described; only be used to further illustrate the present invention; can not be interpreted as limiting the scope of the present invention, the technician in this field can make some nonessential improvement and adjustment according to the content of foregoing invention to the present invention.
The specific embodiment of the invention as shown in Figure 1, include following operation: with chliorinated polyvinyl chloride particle for raw material, plastify through high temperature, extrude injection mo(u)lding, Vacuum shaping, cooling, be cut into, described injection mo(u)lding of extruding adopts special extrusion molding mould, the shaping die body 2 that this special extrusion molding mould includes main die body 1 and is fixedly installed on main die body, this shaping die body to be provided with for super-large diameter chlorinated polyvinyl chloride pipe and diameter is the extrusion moulding annular distance 21 of more than 600mm, one end of described main die body 1 is provided with charging hole 11, be communicated with relative to the inner of charging hole in main die body and be provided with tapered water conservancy diversion annular distance 12, the top of tapered water conservancy diversion annular distance 12 is connected with the inner of charging hole 11, be communicated with relative to the rear end of tapered water conservancy diversion annular distance 12 in described main die body 1 and be provided with transition water conservancy diversion annular distance 13, the leading portion of this transition water conservancy diversion annular distance 13 is connected and the two equal diameters with the back segment of tapered water conservancy diversion annular distance 12, the rear end of this transition water conservancy diversion annular distance 13 is connected with the inner of extrusion moulding annular distance 21, the orient diameter that the back segment 131 of this transition water conservancy diversion annular distance 13 flows to extrusion moulding annular distance 21 according to material reduces setting gradually, described charging hole 11, tapered water conservancy diversion annular distance 12, the central shaft of transition water conservancy diversion annular distance 13 and the central shaft of main die body 1 coincide, described main die body 1 is provided with the first thermal medium chamber 14 relative to the center of tapered water conservancy diversion annular distance 12 and transition water conservancy diversion annular distance 13, this thermal medium chamber includes and is communicated with successively and the small size cylindrical cavity 141 of mutual concentricity axle in direction to the back-end from the front end of main die body, middle volume barrel mast chamber 142 and large volume cylindrical cavity 143, and this small size cylindrical cavity 141, middle volume barrel mast chamber 142 and the central shaft of large volume cylindrical cavity 143 and the central shaft of main die body 1 coincide, described shaping die body 2 is provided with the second thermal medium cylindrical cavity 22 relative to the center of extrusion moulding annular distance 21, the inner of this second thermal medium cylindrical cavity 22 is connected with the rear end of large volume cylindrical cavity 143, and the volume of the second thermal medium cylindrical cavity 22 is greater than the volume of large volume cylindrical cavity, the each fragment position temperature difference of described chliorinated polyvinyl chloride in main die body 1 and shaping die body 2 is not more than 3 degrees Celsius.
The volume parameter of the diameter of the above-mentioned charging hole of the present embodiment 11, tapered water conservancy diversion annular distance 12, transition water conservancy diversion annular distance 13, extrusion moulding annular distance 21 and length and the first thermal medium chamber 14 and the second thermal medium cylindrical cavity 22 carries out specific aim setting according to the material of main die body 1 and shaping die body, thermal conductivity and concrete heating agent used, is not more than 3 degrees Celsius to realize each fragment position temperature difference of described chliorinated polyvinyl chloride in main die body 1 and shaping die body 2.Those skilled in the art under the guidance of the above-mentioned setting of the application, can do concrete optimum configurations.
In addition, the present embodiment chliorinated polyvinyl chloride particle is through baking oven prebake before high temperature plasticizing, and its bake out temperature and time should control within 80 ± 2 DEG C, 2 ± 0.1 hours.
The present embodiment CPVC particulate material used must meet following physics, mechanical performance and chemical resistance requirements:
(1) physics, mechanical property requirements after shaping to raw material CPVC
(2) requirement of the chemical-resistance after shaping to raw material CPVC
Raw material (CPVC) must reach the chemical resistance meeting and select " chemical resistance S level " or " chemically-resistant L level " or " chemical resistance NS level ", spendable chemical mediator in ISO/TR10358:1993 standard.
Specifically can select to adopt the CPVC haloflex produced with the formula of Nuo Yu company of the U.S. for raw material, make product have the characteristic of high strength, high temperature resistant, resistance to strong acid, highly basic.

Claims (2)

1. the preparation technology of a super-large diameter chlorinated polyvinyl chloride pipe, it is characterized in that: include following operation: with chliorinated polyvinyl chloride particle for raw material, plastify through high temperature, extrusion molding, Vacuum shaping, cooling, be cut into, described extrusion molding adopts special extrusion molding mould, this special extrusion molding mould includes main die body and is fixedly installed on the shaping die body on main die body, this shaping die body to be provided with for super-large diameter chlorinated polyvinyl chloride pipe and diameter is the extrusion moulding annular distance of more than 600mm, one end of described main die body is provided with charging hole, be communicated with relative to the inner of charging hole in main die body and be provided with tapered water conservancy diversion annular distance, the tapered top of water conservancy diversion annular distance is connected with the inner of charging hole, be communicated with relative to the rear end of tapered water conservancy diversion annular distance in described main die body and be provided with transition water conservancy diversion annular distance, the leading portion of this transition water conservancy diversion annular distance is connected and the two equal diameters with the back segment of tapered water conservancy diversion annular distance, the rear end of this transition water conservancy diversion annular distance is connected with the inner of extrusion moulding annular distance, the orient diameter that the back segment of this transition water conservancy diversion annular distance flows to extrusion moulding annular distance according to material reduces setting gradually, described charging hole, tapered water conservancy diversion annular distance, the central shaft of transition water conservancy diversion annular distance and the central shaft of main die body coincide, described main die body is provided with the first thermal medium chamber relative to the center of tapered water conservancy diversion annular distance and transition water conservancy diversion annular distance, this thermal medium chamber includes and is communicated with successively and the small size cylindrical cavity of mutual concentricity axle in direction to the back-end from the front end of main die body, middle volume barrel mast chamber and large volume cylindrical cavity, and this small size cylindrical cavity, the central shaft of middle volume barrel mast chamber and large volume cylindrical cavity and the central shaft of main die body coincide, described shaping die body is provided with the second thermal medium cylindrical cavity relative to the center of extrusion moulding annular distance, the inner of this second thermal medium cylindrical cavity is connected with the rear end of large volume cylindrical cavity, and the volume of the second thermal medium cylindrical cavity is greater than the volume of large volume cylindrical cavity, the each fragment position temperature difference of chliorinated polyvinyl chloride in main die body and shaping die body is not more than 3 degrees Celsius.
2. the preparation technology of a kind of super-large diameter chlorinated polyvinyl chloride pipe according to claim 1, it is characterized in that: chliorinated polyvinyl chloride particle is through high-speed mixer prebake before high temperature plasticizing, and its bake out temperature and time should control within 80 ± 2 DEG C, 10 ± 0.1 minutes.
CN201510325925.8A 2015-06-12 2015-06-12 Preparation technology for extra-large-caliber chlorinated polyvinyl chloride pipe Active CN104999642B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115431474A (en) * 2022-11-07 2022-12-06 宁波兴利汽车模具有限公司 Extrusion forming die and processing technology

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003112358A (en) * 2001-10-05 2003-04-15 Sekisui Chem Co Ltd Method for manufacturing vinyl chloride resin liner material for pipe line
CN101344194A (en) * 2008-08-18 2009-01-14 江苏常盛管业有限公司 Production technology of modified polyvinyl chloride pipes
CN201205753Y (en) * 2008-03-31 2009-03-11 东莞市燿安塑胶机器有限公司 Mould for large diameter plastic rubber pipe extruder
KR20090062033A (en) * 2007-12-12 2009-06-17 현대모비스 주식회사 Injection molding device having variable nozzle
CN203472116U (en) * 2013-08-15 2014-03-12 永高股份有限公司 Reinforced polymer plasticizing device of CPVC (Chlorinated Polyvinyl Chloride) pipe extrusion die

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003112358A (en) * 2001-10-05 2003-04-15 Sekisui Chem Co Ltd Method for manufacturing vinyl chloride resin liner material for pipe line
KR20090062033A (en) * 2007-12-12 2009-06-17 현대모비스 주식회사 Injection molding device having variable nozzle
CN201205753Y (en) * 2008-03-31 2009-03-11 东莞市燿安塑胶机器有限公司 Mould for large diameter plastic rubber pipe extruder
CN101344194A (en) * 2008-08-18 2009-01-14 江苏常盛管业有限公司 Production technology of modified polyvinyl chloride pipes
CN203472116U (en) * 2013-08-15 2014-03-12 永高股份有限公司 Reinforced polymer plasticizing device of CPVC (Chlorinated Polyvinyl Chloride) pipe extrusion die

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115431474A (en) * 2022-11-07 2022-12-06 宁波兴利汽车模具有限公司 Extrusion forming die and processing technology

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Denomination of invention: A kind of preparation technology of extra-large diameter chlorinated polyvinyl chloride pipe

Effective date of registration: 20220904

Granted publication date: 20170412

Pledgee: Agricultural Bank of China Limited by Share Ltd. Yueqing branch

Pledgor: YOULI HOLDING GROUP Co.,Ltd.

Registration number: Y2022330002069

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