CN103073779B - Manufacturing formula of dedicated vinyl acetate copolymer for transparent drinking water pipes, manufacturing technique and dedicated processing equipment - Google Patents
Manufacturing formula of dedicated vinyl acetate copolymer for transparent drinking water pipes, manufacturing technique and dedicated processing equipment Download PDFInfo
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- CN103073779B CN103073779B CN201310015447.1A CN201310015447A CN103073779B CN 103073779 B CN103073779 B CN 103073779B CN 201310015447 A CN201310015447 A CN 201310015447A CN 103073779 B CN103073779 B CN 103073779B
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- mixture
- vinyl acetate
- acetate copolymer
- machine barrel
- ethylene
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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
- B29C48/585—Screws provided with gears interacting with the flow
-
- 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
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
-
- 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
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention provides a manufacturing formula of dedicated ethylene-vinyl acetate copolymer for transparent drinking water pipes, wherein thin-film grade ethylene-vinyl acetate copolymer accounts for 98.8 percent, anti-reflection agent accounts for 0.5 percent, and opening agent accounts for 0.5 percent, the opening agent is 1, 3: 2, 4-dibenzylidene sorbitol. Dedicated processing equipment for dedicated vinyl acetate copolymer for transparent drinking water pipes comprises a frame, wherein a cylinder is mounted on the frame, a threaded rod and a heater are mounted inside the cylinder, a speed reducer is mounted at one end of the cylinder and is connected with a motor, a tube-like extrusion head is mounted at the other end of the cylinder, a cooling device is mounted at the exterior of the tube-like extrusion head, and an air knife is opposite to the tube-like extrusion head. The transparency of the product can be enhanced greatly, not only the anti-static performance and the lubricating performance are enhanced, but also the moisture-proof performance is improved, the friction coefficient and the bonding resistance are obviously lowered, the surface smooth finish of the thin film is also enhanced, dust accumulation on the surface of the product is prevented, and the produced plastic products are very smooth.
Description
Technical field
The invention belongs to ethene-vinyl acetate technical field, relate to manufacturing process and the special processing equipment of the special ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe.
Background technology
Ethylene-vinyl acetate copolymer (claiming again ethylene/vinyl acetate), by ethene (E) and vinyl-acetic ester (VA) copolymerization and make, English name is: Ethylene Vinyl Acetate, and referred to as EVA, or E/VAC.
The feature of ethylene-vinyl acetate copolymer is to have good flexibility, and the elasticity that rubber is the same still can have good reelability at-50 DEG C, and the transparency and surface luster property are good, and chemical stability is good, and anti-aging and resistance to ozone intensity is good, nontoxicity.Good with the miscibility of filler, painted good with shaping processability.
It is solid at normal temperatures, and heating melting becomes to a certain extent and can flow, and has the liquid of certain viscosity.
Its main products relates to film, electric wire, LDPE properties-correcting agent, sizing agent, Elastic Film, hot melt tamanori, agricultural film, sheet material, injection moulding, moulded parts, foaming product, hot melt tamanori etc.
But, there is no a kind of formula and complete processing of the ethylene-vinyl acetate copolymer that is exclusively used in the drinking-water pipe that transparency is high, more there is no this type of specific equipment, this problem is urgently improved.
Summary of the invention
Manufacturing process and the special processing equipment of the special ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe are the object of this invention is to provide, by improvement, the present invention is realized and can be used for processing the drinking-water pipe that transparency is high, solved problems of the prior art.
The technical solution adopted in the present invention is,
A manufacturing process for the special ethylene-vinyl acetate copolymer of transparent drinking-water pipe,
Comprise the following steps;
(1) ethylene-vinyl acetate copolymer particle being carried out to early stage processes;
(2) ethylene-vinyl acetate copolymer, transparent agent and opening agent are carried out to combination treatment;
(3) mixture is dropped in the hopper of extrusion system;
(4) mixture in extrusion system by elementary pulverizing and compacting;
(5) mixture enters extrusion system from hopper, due to the relative movement between machine barrel and screw rod, thereby is producing frictional force between material and machine barrel and between material and screw surface, and mixture starts to melt;
(6) mixture of initial stage thawing enters sectional type melt zone, mixture is under the effect of heat of friction and machine barrel indirect heating, temperature constantly raises and presents glutinous stream shape, and form melt film at machine barrel internal surface, the spiral shell rib of rotation constantly scrapes melt film and in screw channel, forms a molten bath, and mixture becomes liquid state;
(7) liquid mixture enters and vacuumizes district, and it is peripheral that the spiral shell rib of horizontal stripe shape is pushed air to liquid stream with centrifugal force, and then evacuator is taken air away;
(8) mixture is continued to advance by screw rod, enters the second melt zone;
(9) mixture is continued to advance by screw rod, enters second and vacuumizes district;
(10) mixture enters extrusion system head, and through ring head, the mixture that the is output as tubulose device air outlet that is cooled is cooling, and steam is blown off, improves the transparency of mixture, simultaneously by air knife from middle blowing moulding;
(11) work in-process aftertreatment.
The special processing equipment of the special ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe, comprise frame, machine barrel is installed in frame, screw rod and well heater are installed in machine barrel, machine barrel one end is provided with step-down gear, and step-down gear connects motor, and the machine barrel the other end is provided with tubular extruded head, tubular extruded outside is provided with refrigerating unit, and tubular extruded opposite is provided with air knife;
Described screw rod comprises screw channel and spiral shell rib, the main shaft diameter of screw rod starts by thin chap from input terminus, described screw rod rear portion, and its spiral shell rib has at least one place to become horizontal stripe shape spiral shell rib from spirrillum, on described machine barrel corresponding position, have vacuum orifice simultaneously, connect evacuator;
Described refrigerating unit is annular air conditioner air outlet.
Preferably, described Heating temperature is 180～300 degrees Celsius.
Preferably, pressure is 40～65MPa.
The invention has the beneficial effects as follows, adopt above-mentioned technique, use special processing equipment simultaneously, can increase greatly the transparency of product, both can improve antistatic and lubricity, can improve again moisture-proof characteristic, can obviously reduce frictional coefficient and bonding resistance, benefit while significantly improving blown film (extrusion molding), can effectively prevent the caking between bonding and the pellet between film, and can increase the smooth finish of film surface, and prevent attached long-pending at product surface of dust, produce very smooth plastic product.
Brief description of the drawings
Fig. 1 is the special manufacturing process of ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe of the present invention and the screw-rod structure schematic diagram of special processing equipment;
Fig. 2 is the special manufacturing process of ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe of the present invention and the refrigerating unit schematic diagram of special processing equipment;
Fig. 3 is the special manufacturing process of ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe of the present invention and the air knife schematic diagram of special processing equipment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
A manufacture formula for the special ethylene-vinyl acetate copolymer of transparent drinking-water pipe, film-grade ethylene-vinyl acetate copolymer 98.8%, transparent agent 0.7%, opening agent 0.5%;
Wherein, described transparent agent is 1,3:2,4-dibenzal sorbitol.
A manufacturing process for the special ethylene-vinyl acetate copolymer of transparent drinking-water pipe,
Comprise the following steps;
(1) ethylene-vinyl acetate copolymer particle being carried out to early stage processes;
(2) ethylene-vinyl acetate copolymer, transparent agent and opening agent are carried out to combination treatment;
(3) mixture is dropped in the hopper of extrusion system;
(4) mixture in extrusion system by elementary pulverizing and compacting;
(5) mixture enters extrusion system from hopper, due to the relative movement between machine barrel and screw rod, thereby is producing frictional force between material and machine barrel and between material and screw surface, and mixture starts to melt;
(6) mixture of initial stage thawing enters sectional type melt zone, mixture is under the effect of heat of friction and machine barrel indirect heating, temperature constantly raises and presents glutinous stream shape, and form melt film at machine barrel internal surface, the spiral shell rib of rotation constantly scrapes melt film and in screw channel, forms a molten bath, and mixture becomes liquid state;
(7) liquid mixture enters and vacuumizes district, and it is peripheral that the spiral shell rib of horizontal stripe shape is pushed air to liquid stream with centrifugal force, and then evacuator is taken air away;
(8) mixture is continued to advance by screw rod, enters the second melt zone;
(9) mixture is continued to advance by screw rod, enters second and vacuumizes district;
(10) mixture enters extrusion system head, and through ring head, the mixture that the is output as tubulose device air outlet that is cooled is cooling, and steam is blown off, improves the transparency of mixture, simultaneously by air knife from middle blowing moulding;
(11) work in-process aftertreatment.
As shown in Figure 1,2 and 3, the special processing equipment of the special ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe, comprise frame, machine barrel is installed in frame, screw rod 1 and well heater are installed in machine barrel, machine barrel one end is provided with step-down gear, step-down gear connects motor, the machine barrel the other end is provided with tubular extruded 2, and tubular extruded 2 outsides are provided with refrigerating unit 3, and tubular extruded 2 opposites are provided with air knife 4;
Described screw rod 1 comprises screw channel 5 and spiral shell rib 6, the main shaft diameter of screw rod starts by thin chap from input terminus, described screw rod rear portion, and its spiral shell rib has at least one place to become horizontal stripe shape spiral shell rib 7 from spirrillum, on described machine barrel corresponding position, have vacuum orifice simultaneously, connect evacuator;
Described refrigerating unit 3 is annular air conditioner air outlet.
Described Heating temperature is 180～300 degrees Celsius.
Described pressure is 40～65MPa.
Adopt above-mentioned formula and technique, use special processing equipment simultaneously, can increase greatly the transparency of product, both can improve antistatic and lubricity, can improve again moisture-proof characteristic, can obviously reduce frictional coefficient and bonding resistance, benefit while significantly improving blown film (extrusion molding), can prevent the caking between bonding and the pellet between film effectively, and can increase the smooth finish of film surface, prevent that dust from amassing the attached of product surface, produces very smooth plastic product.
Above-mentioned embodiment is example of the present invention, is not for limiting enforcement of the present invention and interest field, and all equivalences of making according to the content described in the present patent application scope of patent protection change and modify, and all should be included in the present patent application the scope of the claims.
Claims (4)
1. a manufacturing process for the special ethylene-vinyl acetate copolymer of transparent drinking-water pipe, is characterized in that:
Comprise the following steps;
(1) ethylene-vinyl acetate copolymer particle being carried out to early stage processes;
(2) ethylene-vinyl acetate copolymer, transparent agent and opening agent are carried out to combination treatment;
(3) mixture is dropped in the hopper of extrusion system;
(4) mixture in extrusion system by elementary pulverizing and compacting;
(5) mixture enters extrusion system from hopper, due to the relative movement between machine barrel and screw rod, thereby is producing frictional force between material and machine barrel and between material and screw surface, and mixture starts to melt;
(6) mixture of initial stage thawing enters sectional type melt zone, mixture is under the effect of heat of friction and machine barrel indirect heating, temperature constantly raises and presents glutinous stream shape, and form melt film at machine barrel internal surface, the spiral shell rib of rotation constantly scrapes melt film and in screw channel, forms a molten bath, and mixture becomes liquid state;
(7) liquid mixture enters and vacuumizes district, and it is peripheral that the spiral shell rib of horizontal stripe shape is pushed air to liquid stream with centrifugal force, and then evacuator is taken air away;
(8) mixture is continued to advance by screw rod, enters the second melt zone;
(9) mixture is continued to advance by screw rod, enters second and vacuumizes district;
(10) mixture enters extrusion system head, and through ring head, the mixture that the is output as tubulose device air outlet that is cooled is cooling, and steam is blown off, improves the transparency of mixture, simultaneously by air knife from middle blowing moulding;
(11) work in-process aftertreatment.
2. the special processing equipment of the special ethylene-vinyl acetate copolymer of a transparent drinking-water pipe, it is characterized in that: comprise frame, machine barrel is installed in frame, screw rod and well heater are installed in machine barrel, machine barrel one end is provided with step-down gear, and step-down gear connects motor, and the machine barrel the other end is provided with tubular extruded head, tubular extruded outside is provided with refrigerating unit, and tubular extruded opposite is provided with air knife;
Described screw rod comprises screw channel and spiral shell rib, the main shaft diameter of screw rod starts by thin chap from input terminus, described screw rod rear portion, and its spiral shell rib has at least one place to become horizontal stripe shape spiral shell rib from spirrillum, on described machine barrel corresponding position, have vacuum orifice simultaneously, connect evacuator;
Described refrigerating unit is annular air conditioner air outlet.
3. the manufacturing process of the special ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe according to claim 1, is characterized in that: Heating temperature is 180～300 degrees Celsius.
4. the manufacturing process of the special ethylene-vinyl acetate copolymer of a kind of transparent drinking-water pipe according to claim 1, is characterized in that: pressure is 40～65MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310015447.1A CN103073779B (en) | 2013-01-15 | 2013-01-15 | Manufacturing formula of dedicated vinyl acetate copolymer for transparent drinking water pipes, manufacturing technique and dedicated processing equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310015447.1A CN103073779B (en) | 2013-01-15 | 2013-01-15 | Manufacturing formula of dedicated vinyl acetate copolymer for transparent drinking water pipes, manufacturing technique and dedicated processing equipment |
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| CN103073779A CN103073779A (en) | 2013-05-01 |
| CN103073779B true CN103073779B (en) | 2014-12-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104592581A (en) * | 2015-01-26 | 2015-05-06 | 姜杰 | Formula and preparation technology of rubber polymer particles |
| CN106397867A (en) * | 2016-11-14 | 2017-02-15 | 常熟市永祥机电有限公司 | Preparation method of rubber polymer granules |
| CN106397866A (en) * | 2016-11-14 | 2017-02-15 | 常熟市永祥机电有限公司 | Rubber polymer granule |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3524222A (en) * | 1968-05-13 | 1970-08-18 | Egan Machinery Co | Extruder screw devolatilizing and mixing section |
| DE2058642B2 (en) * | 1970-11-28 | 1972-05-25 | Troester Maschf Paul | EXTRUDER SCREW FOR THE PROCESSING OF PLASTIC, IN PARTICULAR RUBBER-LIKE MATERIALS |
| US5415909A (en) * | 1992-12-17 | 1995-05-16 | Sekisui Chemical Co., Ltd. | Interlayer film and laminated glass using the same |
| EP1361742B1 (en) * | 2002-04-23 | 2018-03-21 | NTT DoCoMo, Inc. | Prepaid system and method and communication terminal |
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