CN108976631B - PVC composition for dip molding and preparation method thereof - Google Patents
PVC composition for dip molding and preparation method thereof Download PDFInfo
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- CN108976631B CN108976631B CN201710399180.9A CN201710399180A CN108976631B CN 108976631 B CN108976631 B CN 108976631B CN 201710399180 A CN201710399180 A CN 201710399180A CN 108976631 B CN108976631 B CN 108976631B
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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
- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
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Abstract
A PVC composition for dip molding and a preparation method thereof belong to the technical field of plastic processing. The adhesive is characterized by comprising the following components in parts by weight: 100 parts of PVC resin; 2.0-3.0 parts of organic tin stabilizer; 5.0-10.0 parts of ethylene-acrylic acid copolymer; 45-55 parts of DOP; 2.0-4.0 parts of titanium dioxide; 0.4-0.7 part of polyethylene wax; the ethylene-acrylic acid copolymer is an ethylene-acrylic acid copolymer with acrylic acid mass content of 15-30%. The PVC composition for dip molding has short leveling forming time and excellent bonding capacity with a metal framework, and the prepared dip molding product has a smooth and bright surface and large bonding force with the metal framework.
Description
Technical Field
A PVC composition for dip molding and a preparation method thereof belong to the technical field of plastic processing.
Background
Heating the metal product at high temperature, dipping the metal product into the plastic powder, placing the metal product dipped with the plastic powder in a high-temperature heating furnace, rotating and heating for a certain time, and cooling to obtain the metal product wrapped with the plastic coating. The dipping plastic material using polyvinyl chloride as base material has good weather resistance, excellent corrosion resistance of coating, good performance of resisting alcohol, gasoline and aromatic hydrocarbon solvents compared with polyolefin powder coating, outstanding flame retardant performance, higher electrical insulation of coating, bright and beautiful color and low price.
The conventional polyvinyl chloride powder dipping plastic composition consists of 100 parts of polyvinyl chloride, 2-15 parts of polyvinyl chloride paste resin, 35-65 parts of plasticizer, 1-7 parts of stabilizer, 1-6 parts of epoxidized soybean oil, 2-10 parts of lubricant and 0-10 parts of filler. The dipping plastic composition with short melting plasticizing time and good leveling property is obtained by controlling the polymerization degree of the polyvinyl chloride resin and the particle size of the composition.
The polyvinyl chloride dipping plastic composition with strong metal bonding force comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 2-8 parts of polyvinyl butyral, 50-60 parts of plasticizer, 1-5 parts of organic tin stabilizer, 1-6 parts of auxiliary stabilizer and 1-4 parts of compound lubricant. The composition has the advantages of firm adhesion with metal, high hardness, corrosion resistance, aging resistance, long service life, environmental friendliness and the like.
However, the existing compositions generally have the defects that the viscosity is too high during leveling, the leveling cannot be well performed in a short time, the surface of a dipping plastic product is rough, and the bonding force between the PVC composition and a metal framework is small.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, and provides the PVC composition for dipping plastic and the preparation method thereof, which can shorten the molding and leveling time of the PVC dipping plastic product and improve the adhesive force between the PVC composition and the metal framework in the dipping plastic product.
The technical scheme adopted by the invention for solving the technical problems is as follows: the PVC composition for dip molding is characterized by comprising the following components in parts by weight: 100 parts of PVC resin; 2.0-3.0 parts of organic tin stabilizer; 5.0-10.0 parts of ethylene-acrylic acid copolymer; 45-55 parts of DOP; 2.0-4.0 parts of titanium dioxide; 0.4-0.7 part of polyethylene wax; the ethylene-acrylic acid copolymer is an ethylene-acrylic acid copolymer with acrylic acid mass content of 15-30%.
The formula of the PVC dip-molding material is added with a proper amount of the ethylene-acrylic acid copolymer, and the added ethylene-acrylic acid copolymer with the acrylic acid content of 15-30% can endow the PVC dip-molding material with shorter molding leveling time and excellent bonding capability with a metal framework.
Preferably, the composition in parts by weight is: 100 parts of PVC resin; 2.3-2.6 parts of organic tin stabilizer; 6.7-7.8 parts of an ethylene-acrylic acid copolymer; 48-52 parts of DOP; 2.7-3.4 parts of titanium dioxide; 0.56-0.61 part of polyethylene wax. The preferred addition of the auxiliary agent can provide the best auxiliary effect for the application of the ethylene-acrylic acid copolymer, and the shortest molding leveling time can be achieved.
The average polymerization degree of the PVC resin is 500-700. Polymerization of the PVC resin itself has a large influence on the melt flowability of the composition. The PVC resin with the average polymerization degree of 500-700 selected by the inventor has the advantages of best adaptability to the added ethylene-acrylic acid copolymer, more uniform dispersion, and better leveling time and bonding capability of the composition.
Preferably, the PVC resin has an average polymerization degree of 650. The preferred average degree of polymerization of the PVC resin achieves the best results of the present invention.
Preferably, the organotin stabilizer is methyl tin mercaptide stabilizer. The stabilizer of methyl tin mercaptide has the best adaptability, the most uniform dispersion and the highest surface flatness of dipped plastic products.
Preferably, the ethylene-acrylic acid copolymer is an ethylene-acrylic acid copolymer with acrylic acid mass content of 19-24%. The preferred acrylic acid content allows for optimum results in molding leveling time and bonding ability with the metal framework.
Preferably, the titanium dioxide is rutile titanium dioxide.
The preparation method of the PVC composition for dip molding is characterized by comprising the following steps: weighing the materials, putting the materials into a high-speed mixer with the rotating speed of 1000-1500 r/min, mixing, heating to 98-105 ℃, discharging the materials into a low-speed mixer with the rotating speed of 70-95 r/min, cooling to 28-33 ℃, and discharging to obtain the material.
Preferably, the heating rate in the high-speed mixer is 5-8 ℃/min. In the preparation method, the high-speed mixing is carried out at a specific heating rate, so that the stable performance of the composition is ensured.
Preferably, the rotating speed of the high-speed mixer is 1400 r/min.
Preferably, the rotating speed of the low-speed mixer is 80 r/min.
Preferably, the temperature of the discharged material is 29-30 ℃.
Compared with the prior art, the PVC composition for dip molding and the preparation method thereof have the beneficial effects that: the ethylene-acrylic acid copolymer with the acrylic acid content of 15-30% can endow the PVC dip molding material with shorter molding leveling time and excellent bonding capability with a metal framework. Compared with common PVC dip-molding products, the dip-molding product prepared by the composition has flat and bright surface and large bonding force with a metal framework. The PVC composition for dip molding has short leveling forming time and excellent bonding capacity with a metal framework, and the prepared dip molding product has a smooth and bright surface and large bonding force with the metal framework.
Detailed Description
The present invention is further illustrated by the following specific examples, wherein the compositions of the examples and comparative examples in parts by weight are shown in tables 1 and 2, and example 1 is the most preferred example.
TABLE 1 weight distribution ratio (parts) of examples
Wherein, the ethylene-acrylic acid copolymer in the embodiment 1 is the ethylene-acrylic acid copolymer with the acrylic acid mass content of 22%; the ethylene-acrylic acid copolymer in examples 2 and 3 is an ethylene-acrylic acid copolymer having an acrylic acid content of 19% by mass; the ethylene-acrylic acid copolymer in example 4 was an ethylene-acrylic acid copolymer having an acrylic acid content of 24% by mass; the ethylene-acrylic acid copolymer in example 5 was an ethylene-acrylic acid copolymer having an acrylic acid content of 15% by mass; the ethylene-acrylic acid copolymer in example 6 was an ethylene-acrylic acid copolymer having an acrylic acid content of 30% by mass.
TABLE 2 weight distribution ratio (parts) of comparative examples
In the comparative examples, the ethylene-acrylic acid copolymers were all ethylene-acrylic acid copolymers having an acrylic acid content of 22% by mass.
The materials are accurately weighed according to the formulas of the examples and the comparative examples, are placed into a high-speed mixer to be mixed to 98-105 ℃ at the rotating speed of 1400r/min, are discharged into a low-speed mixer to be mixed to 28-33 ℃ at the rotating speed of 80r/min, and are discharged, so that the PVC composition for dip molding is obtained.
The method for testing the leveling property of the PVC dipping composition comprises the following steps: derusting iron wires with the diameter of 5-10mm, placing the iron wires in a muffle furnace at the temperature of 320-340 ℃ for preheating for 1.0min, immediately dipping the iron wires in PVC powder coating for 1.0-1.5s, then quickly placing the iron wires in an oven at the temperature of 220 ℃ for a leveling test, using a stopwatch to time, and observing the shortest time required by the PVC powder coating to be flat and smooth on the surface of a sample by naked eyes.
Preparation of a peeling force sample: the PVC powder coating is mixed homogeneously in a high-speed mixer and, after plasticization on a 160 ℃ two-roll slicer, a 0.5mm thick sheet is cut. A0.5 mm sheet was sandwiched between two 0.4mm aluminum plates, and the sheet was pressed at 180 ℃ to prepare a composite sheet having a plastic interlayer in the middle, and the adhesion peel force between the two aluminum plates was examined.
The peeling force detection method comprises the following steps: the specimen width was 20mm according to GB/T7122-1996, and the peel draw rate was 50 mm/min.
The results of the performance tests on the PVC dip-molded articles of examples and comparative examples are shown in Table 3.
TABLE 3 results of performance test of PVC dip-molded articles of examples and comparative examples
As can be seen from the examples and the comparative examples, after the ethylene-acrylic acid copolymer is added, the PVC dip-molded product has the advantages of short molding leveling time, flat and bright surface, good adhesion with a metal material and higher stripping force between the PVC dip-molded product and the metal material. And PVC dip-molding products which are not added or added with little ethylene-acrylic acid copolymer have long molding leveling time, low glossiness, easy yellowing of coatings after long heating time, poor adhesion with metal materials and low stripping force between the PVC dip-molding products and the metal materials.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (11)
1. The PVC composition for dip molding is characterized by comprising the following components in parts by weight: 100 parts of PVC resin; 2.0-3.0 parts of organic tin stabilizer; 5.0-10.0 parts of ethylene-acrylic acid copolymer; 45-55 parts of DOP; 2.0-4.0 parts of titanium dioxide; 0.4-0.7 part of polyethylene wax; the ethylene-acrylic acid copolymer is an ethylene-acrylic acid copolymer with acrylic acid mass content of 15-30%;
the average polymerization degree of the PVC resin is 500-700.
2. The PVC composition for dip molding according to claim 1, which comprises the following components in parts by weight: 100 parts of PVC resin; 2.3-2.6 parts of organic tin stabilizer; 6.7-7.8 parts of an ethylene-acrylic acid copolymer; 48-52 parts of DOP; 2.7-3.4 parts of titanium dioxide; 0.56-0.61 part of polyethylene wax.
3. A PVC composition for dip-molding according to claim 1 or 2, characterized in that: the average polymerization degree of the PVC resin is 650.
4. A PVC composition for dip-molding according to claim 1 or 2, characterized in that: the organic tin stabilizer is methyl tin mercaptide stabilizer.
5. A PVC composition for dip-molding according to claim 1 or 2, characterized in that: the ethylene-acrylic acid copolymer is an ethylene-acrylic acid copolymer with acrylic acid mass content of 19-24%.
6. A PVC composition for dip-molding according to claim 1 or 2, characterized in that: the titanium dioxide is rutile type titanium dioxide.
7. A process for the preparation of a PVC composition for dip-molding according to any one of claims 1 to 6, characterized in that: weighing the materials, putting the materials into a high-speed mixer with the rotating speed of 1000-1500 r/min, mixing, heating to 98-105 ℃, discharging the materials into a low-speed mixer with the rotating speed of 70-95 r/min, cooling to 28-33 ℃, and discharging to obtain the material.
8. The process for the preparation of a PVC composition for dip-molding according to claim 7, characterized in that: the heating rate in the high-speed mixer is 5-8 ℃/min.
9. The process for the preparation of a PVC composition for dip-molding according to claim 7, characterized in that: the rotating speed of the high-speed mixer is 1400 r/min.
10. The process for the preparation of a PVC composition for dip-molding according to claim 7, characterized in that: the rotating speed of the low-speed mixer is 80 r/min.
11. The process for the preparation of a PVC composition for dip-molding according to claim 7, characterized in that: the temperature of the discharged material is 29-30 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710399180.9A CN108976631B (en) | 2017-05-31 | 2017-05-31 | PVC composition for dip molding and preparation method thereof |
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| CN108976631B true CN108976631B (en) | 2020-12-22 |
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| CN110527213A (en) * | 2019-08-12 | 2019-12-03 | 天津市凯鑫金属制品有限公司 | A kind of kettle-bell leaching modeling liquid and its impregnation |
| CN118374110B (en) * | 2024-06-25 | 2024-11-15 | 山东东立高分子材料有限公司 | A high temperature resistant insulating plastic dipping liquid and preparation method thereof |
Citations (7)
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| US6043312A (en) * | 1989-06-27 | 2000-03-28 | The Furon Company | Low flame and smoke compositions for plenum cables |
| CN1563178A (en) * | 2004-03-25 | 2005-01-12 | 浙江大学 | Constitutes of technical formula in use for dipping plastic |
| CN101014628A (en) * | 2004-09-09 | 2007-08-08 | 聚合体弹性织物有限公司 | Polymer latex suitable for preparing dip-molded articles |
| US7737210B2 (en) * | 2006-12-22 | 2010-06-15 | E.I. Du Pont De Nemours And Company | Composition comprising polyvinyl chloride and ethylene copolymer |
| CN102286181A (en) * | 2010-06-21 | 2011-12-21 | 国家复合改性聚合物材料工程技术研究中心 | Formula of high-liquidity polyvinyl chloride alloy and preparation method |
| CN103524918A (en) * | 2012-07-05 | 2014-01-22 | 中国石油化工股份有限公司 | Polyvinyl chloride powdery plastic dipping composition |
| CN104558914A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Polyvinyl-chloride dipping plastic composition with strong metal bonding force |
-
2017
- 2017-05-31 CN CN201710399180.9A patent/CN108976631B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6043312A (en) * | 1989-06-27 | 2000-03-28 | The Furon Company | Low flame and smoke compositions for plenum cables |
| CN1563178A (en) * | 2004-03-25 | 2005-01-12 | 浙江大学 | Constitutes of technical formula in use for dipping plastic |
| CN101014628A (en) * | 2004-09-09 | 2007-08-08 | 聚合体弹性织物有限公司 | Polymer latex suitable for preparing dip-molded articles |
| US7737210B2 (en) * | 2006-12-22 | 2010-06-15 | E.I. Du Pont De Nemours And Company | Composition comprising polyvinyl chloride and ethylene copolymer |
| CN102286181A (en) * | 2010-06-21 | 2011-12-21 | 国家复合改性聚合物材料工程技术研究中心 | Formula of high-liquidity polyvinyl chloride alloy and preparation method |
| CN103524918A (en) * | 2012-07-05 | 2014-01-22 | 中国石油化工股份有限公司 | Polyvinyl chloride powdery plastic dipping composition |
| CN104558914A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Polyvinyl-chloride dipping plastic composition with strong metal bonding force |
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