CN106751113A - A kind of polyvinyl chloride film composition - Google Patents
A kind of polyvinyl chloride film composition Download PDFInfo
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- CN106751113A CN106751113A CN201610235837.3A CN201610235837A CN106751113A CN 106751113 A CN106751113 A CN 106751113A CN 201610235837 A CN201610235837 A CN 201610235837A CN 106751113 A CN106751113 A CN 106751113A
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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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use 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; Derivatives of such polymers
- C08J2327/02—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use 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; Derivatives of such polymers
- C08J2427/22—Characterised by the use 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; Derivatives of such polymers modified by chemical after-treatment
- C08J2427/24—Characterised by the use 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; Derivatives of such polymers modified by chemical after-treatment halogenated
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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
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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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
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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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
- 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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Abstract
A kind of polyvinyl chloride film composition, belongs to macromolecular material product and manufacture field.It is characterized in that：The present invention with the chliorinated polyvinyl chloride and average degree of polymerization of 100 gross masses part be 1300 ~ 1800 Corvic for main material, and based on this amount 40 ~ 60 parts of addition plasticizer TOTM, 1 ~ 6 part of heat stabilizer, 1 ~ 3 part of auxiliary stabilizer epoxidized soybean oil, 0.5 ~ 1.5 part of lubricant, 3 ~ 8 parts of filler, 5 ~ 10 parts of chlorinated polyethylene resin, antioxidant 1010 and DSTDP 0.5 ~ 0.8 part of composite antioxidant.The present invention fills appropriate High Resistant Resin ＆ Its Vingon using resin based on higher molecular weight polyvinyl chloride（CPVC）, adding liquid auxiliary agent is eliminated to infiltrative adverse effect, improve the anti-permeability of material and improve the intensity of product.
Description
Technical field
A kind of polyvinyl chloride film composition, belongs to macromolecular material product and manufacture field.
Background technology
Geomembrane is that a kind of high-quality that engineering circles are seeking to for a long time is light, is easy to construction, cheap, performance can
The impervious material for leaning on.There is geomembrane enhancing, separation, antiseepage, control to corrode and contain various work(such as shaping in civil engineering
Energy.Classify from material, geomembrane mainly there are the kinds such as polyethylene, polypropylene and polyvinyl chloride.
China's agricultural, water conservancy irrigation, infrastructure construction and field of Environment Protection are in the urgent need to the geotechnique of a large amount of difference in functionalitys
Film, this provides power and opportunity for the development of geomembrane with application.From in terms of the existing actual conditions of China, domestic geomembrane
Application and research show that geomembrane class is not high also in disconnection state, and the quality and specification of material have much room for improvement.As soil
The main raw material(s) of work film, PVC itself has acid and alkali-resistance, resistance to flame, self-extinguishment, wear-resisting, intensity a characteristic high, wide material sources, very
It is adapted to production geomembrane.PVC molecular weight is bigger, and mechanical property, cold resistance, heat endurance are higher, but processing and forming is more difficult；Point
Son amount is low then opposite.
On the surface, geomembrane is a piece of material being waterproof, but actually the hole of film is big under pressure
It is small to change, it still is able to permeable.When geomembrane is contacted with coarse-grained soil, because the hole between grogs is larger, geomembrane exists
It is forced under overlying effect of water pressure in native space and is trapped into, thus produced elongation strain, infiltration can be produced when tension is excessive
Point.
CNS《GB/T 17688-1999, geosynthetics, polyvinyl chloride geomembrane》Define polychlorostyrene second
The classification of alkenes geomembrane product, name and technical requirements.Several sides below generally existing in current polyvinyl chloride geomembrane use
Face problem, one is that polyvinyl chloride geomembrane intensity is not high, it is relatively low to contact the ability of the hard objects adaptive deformations such as stone, so as to make
It is easily damaged into construction and use；Two is polyvinyl chloride film due to the addition of more liquid adjuvants in process, or
Internal structure that is many or destroying molecule less, thus to the certain adverse effect of infiltration generation of material.
Chinese patent CN101864129B discloses a kind of formula of acrylonitrile butadiene rubber modified polyvinyl chloride geomembrane, and this is matched somebody with somebody
Just based on common polyvinyl chloride, dioctyl phthalate（DOP）And di-n-octyl sebacate（DOS）As plasticizer, fourth
Nitrile rubber is used as plasticized modifier, but anti-permeability is still general, and nitrile rubber resistance to ag(e)ing is poor, makes the use of film
Life-span is affected.Chinese periodical《Plastics》4th interim Production Techniques of Leakproof Geomembrane discloses a kind of PVC antiseepages soil within 2003
The formula of work film, formula design uses PVC SG-4 type resins；Diisooctyl phthalate（DOP）Increase based on 30 ~ 45 parts
Modeling agent；Dioctyl adipate（DOA）3 ~ 4 parts use for low temperature cold resistant plasticizer, also impermeable without more preferable enhanced film
Effect.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the deficiencies in the prior art, there is provided one kind can be eliminated in PVC processing
Influence of the liquid adjuvants to films anti-penetration performance, while having a kind of polyvinyl chloride film composition of higher-strength.
The technical solution adopted for the present invention to solve the technical problems is：A kind of polyvinyl chloride film composition, its feature
It is to be made up of the proportioning blending of following raw material：40 ~ 80 parts of Corvic, 20 ~ 60 parts of chliorinated polyvinyl chloride, increasing
40 ~ 60 parts of modeling agent TOTM, 1 ~ 6 part of heat stabilizer, 1 ~ 3 part of auxiliary stabilizer epoxidized soybean oil, 0.5 ~ 1.5 part of lubricant, filling
0.5 ~ 0.8 part of the composite antioxidant of 3 ~ 8 parts of agent, 5 ~ 10 parts of chlorinated polyethylene resin, antioxidant 1010 and DSTDP, polyvinyl chloride
Resin and chliorinated polyvinyl chloride sum are 100 weight portions；The average degree of polymerization of Corvic is 1300 ~ 1800.
Preferably, the average degree of polymerization of described Corvic is 1700, is produced using suspension process, and consumption is 50
~ 60 weight portions.The average degree of polymerization of Corvic is very big to the performance impact of this geotechnological film composition, and average degree of polymerization is
1700 Corvic rear geomembrane for enabling to obtain in this geotechnological film composition is added to according to above-mentioned weight portion
Its working environment is fully adapted to, its mechanical property is adapted with the grogs hole of geomembrane laying environment, do not result in undue drawing
Stretching strain, can make bottom grogs overall more closely knit in the case where effect of water pressure is covered, and be after the difficulty of comprehensive shaping processing
The selection of optimal average degree of polymerization.
Preferably, described chliorinated polyvinyl chloride（CPVC）Consumption is 40 ~ 50 weight portions.The addition energy of chliorinated polyvinyl chloride
Effectively combined with Corvic, influenced each other.Corvic is mainly this geotechnological film composition and provides mechanical property,
And chliorinated polyvinyl chloride is mainly this geotechnological film composition and provides anti-permeability performance.The species and consumption of vinyl chloride comonomers for
The property influence of copolymer is very big, and the vinyl chloride of 10% content can cause the copolymer and polychlorostyrene of chliorinated polyvinyl chloride in copolymer
Both strand is parallel-oriented after fusion plastification extrusion is more easy to break for vinyl, it is ensured that geotechnological film composition it is each to power
Learn performance and anti-permeability performance.
Preferably, described haloflex（CPE）, 35 ~ 45%, consumption is 6 ~ 8 parts to chlorinity.Haloflex is made
It is low temperature modification macromolecular material.
Preferably, described plasticizer is trioctyl trimellitate (TOTM)（TOTM）Class plasticizer, consumption is 45 ~ 50 weight portions.
Consider from the durability of the long-lasting of plasticising, water-extraction resistance and material, preferably TOTM plasticizer.
Preferably, described heat stabilizer is organic tin stabilizer or calcium zinc heat stabilizer；Wherein organic tin stabilizer is used
It is 1.5 ~ 2.5 weight portions to measure, and calcium zinc stabilizer consumption is 4 ~ 6 weight portions.Organic tin stabilizer such as 17MOK, calcium zinc stabilizer is such as
Ai Dike RUP-129.
Preferably, described auxiliary stabilizer is epoxidized soybean oil, and consumption is 2 weight portions.The epoxy construction energy that it has
The hydrogen chloride produced by decomposing is absorbed and neutralized in process, delays to be thermally decomposed.
Preferably, described lubricant is stearic acid（HSt）, Tissuemat E（PE waxes）Compound, its combined weight ratio
It is 1:1, total consumption is 0.8 ~ 1.0 part.
Preferably, described filler is the compound of titanium dioxide and nano-calcium carbonate, and wherein titanium dioxide is rutile-type,
Particle size range is 0.1 ~ 1.0um, and the particle diameter of nano-calcium carbonate is 0.1 ~ 1.0um；Total consumption is 4 ~ 6 weight portions.
Preferably, [3- (3,5- di-t-butyl -4- oxybenzenes four in the composite antioxidant of described antioxidant 1010 and DLDTP
Base) propionic acid] quaternary amyl alcohol ester（Antioxidant 1010）With double (18) esters of thio-2 acid（Antioxidant DSTDP）Compound it is compound
Ratio is 1:1, composite antioxidant consumption is 0.6 part.
Plasticizer TOTM, heat stabilizer, auxiliary stabilizer in said composition（ESBO）, lubricant, filler, chlorinated polyethylene
Alkene (CPE), the consumption of composite antioxidant are measured based on polyvinyl chloride and the weight portion of chliorinated polyvinyl chloride sum 100.
A kind of preparation method of the polychloroethylene composition of above-mentioned film is as follows：
1st, material compounding process：By Corvic, chliorinated polyvinyl chloride, heat stabilizer, auxiliary stabilizer, plasticizer, profit
Lubrication prescription, filler, composite antioxidant mix in mixed at high speed unit, to 100~110 DEG C of mixing temperature, material are put into
Mix in low speed mixer, discharged when temperature of charge is cooled to 38 ~ 42 DEG C；
2nd, prilling：The material that will be mixed is granulated using double screw extruder, 130 DEG C~160 DEG C of prilling temperature；After granulation
Finished product is through air-cooled pelletizing, metering, packaging；
3rd, processing and forming technology：Using Ф more than 120, screw slenderness ratio is 30:More than 1 single screw extrusion machine fusion plastification is squeezed
Go out, film forming carried out using the special four-roll calendaring unit of flexible PVC, through traction, sizing, it is air-cooled to after normal temperature upper roller winding,
Metering, packaging；Four-roll calendaring forming temperature is at 130 DEG C~175 DEG C.
Present invention resin based on higher molecular weight polyvinyl chloride, both ensure that composition had good physical mechanical
Performance（High tensile, high-tear strength, high resilience）, the machine-shaping property of geomembrane has been taken into account again；High barrier
Resin chliorinated polyvinyl chloride（CPVC）Addition substantially increase the anti-permeability of material, eliminate adding liquid auxiliary agent to infiltration
The adverse effect of property, and improve thin film strength；Trioctyl trimellitate (TOTM)（TOTM）The use of plasticizer improves composition
Softness, TOTM is larger due to its molecular polarity, stronger with polyvinyl chloride interaction force, therefore has after blending fine
Plasticising stability, plasticised polyvinyl chloride blend is shown preferable Long Service Life；Using haloflex（CPE）
Used as the low temperature modification agent of the geotechnological film composition, experiment shows, a small amount of haloflex（140B types）Use can improve
The cold tolerance of polyvinyl chloride geomembrane composition.
Compared with prior art, a kind of polyvinyl chloride film composition of the invention is had an advantageous effect in that：This hair
Resin based on bright use higher molecular weight polyvinyl chloride, and fill appropriate High Resistant Resin ＆ Its chliorinated polyvinyl chloride
（CPVC）, adding liquid auxiliary agent is eliminated to infiltrative adverse effect, improve the anti-permeability of material.Between each raw material mutually
Coordinate, influence each other, the present invention had both been ensure that composition had high tensile, high-tear strength, high resilience are taken into account again
The machine-shaping property of geomembrane is arrived, 45 g/m of the rate of perviousness of material from general polyvinyl chloride geomembrane2.24h bring up to
21 g/m2.24h.And material therefor of the present invention is easy to get, the production Technology of selection is simply ripe, with practicality and can
Operability.
Specific embodiment
With reference to embodiment, a kind of polyvinyl chloride film composition of the invention is further described, wherein implementing
Example 1 is most preferred embodiment.
Table 1, each material component proportioning of embodiment 1 ~ 10, is in parts by weight, unit serving.
Table 2, each material component proportioning of comparative example 1 ~ 3, is in parts by weight, unit serving.
The preparation method of embodiment：
（1）Raw material is compounded：Material is weighed up by each embodiment raw material proportioning, is then added to mix in high-speed mixer, to mixing
100 ~ 110 DEG C of temperature, material is put into low speed mixer and is mixed, and is discharged when temperature of charge is cooled to 40 DEG C or so.
（2）Prilling：The material that will be mixed is granulated using parallel double-screw, and technological parameter sets as follows：
Extruder temperature（℃）：The area's head of 1st area, 2nd area, 3rd area, 4th area 5
120 130 140 150 160 155
（3）Processing and forming technology, using Ф more than 120, screw slenderness ratio is 30:More than 1 single screw extrusion machine fusion plastification
Extrusion, film forming is carried out using the special four-roll calendaring unit of flexible PVC, through traction, sizing, air-cooled is twined to upper roller after normal temperature
Around, metering, packaging.Four-roll calendaring forming temperature is at 130 DEG C~175 DEG C.
By the raw material proportioning of each comparative example, produced using same procedure.Then the film for will be rolled and strikes out standard institute
Batten is needed, performance test is carried out, as a result be see the table below.
The polyvinyl chloride geomembrane composition embodiment of table 3, the performance test results of comparative example
（Note：Method of testing is：Tensile property is tested according to GB/T13022, and tearing strength is tested according to GB/T11999, rate of perviousness
Tested with cup type method through test system using vapor, the test condition of rate of perviousness：32 DEG C of temperature, humidity 90%, film is thick
Degree 0.3mm）
Be can be seen that under identical testing conditions by table, the embodiment of the present invention is compared with comparative example, present composition reality
The rate of perviousness for applying example is substantially reduced, and excellent performance, 45 g/ms of the rate of perviousness from general polyvinyl chloride geomembrane2.24h bring up to
21 g/m2.24h, tensile strength compares comparative example in the close embodiment of other fillers except polyvinyl chloride and chliorinated polyvinyl chloride
Improve about 3 MPas.Illustrate that product of the present invention has tensile strength and anti-permeability performance higher.
The above, it is not the limitation for making other forms to the present invention for presently preferred embodiments of the present invention to be only, is appointed
What those skilled in the art changed possibly also with the technology contents of the disclosure above or be modified as equivalent variations etc.
Effect embodiment.But it is every without departing from technical solution of the present invention content, according to technical spirit of the invention to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. a kind of polyvinyl chloride film composition, it is characterised in that be made up of the proportioning blending of following raw material：Polyvinyl chloride
40 ~ 80 parts of resin, 20 ~ 60 parts of chliorinated polyvinyl chloride, 40 ~ 60 parts of plasticizer TOTM, 1 ~ 6 part of heat stabilizer, auxiliary stabilizer ring
1 ~ 3 part of oxygen soybean oil, 0.5 ~ 1.5 part of lubricant, 3 ~ 8 parts of filler, 5 ~ 10 parts of chlorinated polyethylene resin, antioxidant 1010 and
0.5 ~ 0.8 part of the composite antioxidant of DSTDP；Corvic and chliorinated polyvinyl chloride sum are 100 weight portions；Polyvinyl chloride
The average degree of polymerization of resin is 1300 ~ 1800.
2. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described Corvic
It is the Corvic of suspension process production, average degree of polymerization is 1700, consumption is 50 ~ 60 weight portions.
3. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described chliorinated polyvinyl chloride
（CPVC）Consumption is 40 ~ 50 weight portions.
4. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described haloflex
（CPE）, 35 ~ 45%, consumption is 6 ~ 8 parts to chlorinity.
5. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described plasticizer is inclined benzene
Three sour three monooctyl esters（TOTM）Class plasticizer, consumption is 45 ~ 50 weight portions.
6. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described heat stabilizer is have
Machine tin stabilizer or calcium zinc heat stabilizer；Wherein organic tin stabilizer consumption is 1.5 ~ 2.5 weight portions, and calcium zinc stabilizer consumption is
4 ~ 6 weight portions.
7. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described auxiliary stabilizer is
Epoxidized soybean oil, consumption is 2 weight portions.
8. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described lubricant is tristearin
Acid, the compound of Tissuemat E, its combined weight ratio are 1:1, total consumption is 0.8 ~ 1.0 part.
9. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described filler is titanium white
The compound of powder and nano-calcium carbonate, wherein titanium dioxide are rutile-type, and particle size range is 0.1 ~ 1.0um, nano-calcium carbonate
Particle diameter is 0.1 ~ 1.0um；Total consumption is 4 ~ 6 weight portions.
10. a kind of polyvinyl chloride film composition according to claim 1, it is characterised in that：Described antioxidant 1010
With [3- (3,5- di-t-butyl -4- hydroxyphenyls) propionic acid] quaternary amyl alcohol ester four in the composite antioxidant of DLDTP（Antioxidant 1010）With
Double (18) esters of thio-2 acid（Antioxidant DSTDP）Compound compositely proportional be 1:1, composite antioxidant consumption is 0.6
Part.
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| CN108047616A (en) * | 2017-12-26 | 2018-05-18 | 宜兴市光辉包装材料有限公司 | A kind of hot filling modified PVC thermal contractive label membrane preparation method |
| CN108864618A (en) * | 2018-07-25 | 2018-11-23 | 李丹丹 | A kind of high antibacterial wear-resisting PVC resin material and preparation method thereof |
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| CN108047616A (en) * | 2017-12-26 | 2018-05-18 | 宜兴市光辉包装材料有限公司 | A kind of hot filling modified PVC thermal contractive label membrane preparation method |
| CN108864618A (en) * | 2018-07-25 | 2018-11-23 | 李丹丹 | A kind of high antibacterial wear-resisting PVC resin material and preparation method thereof |
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Application publication date: 20170531 |