CN104387693A - Medical plastic composite material and preparation method thereof - Google Patents
Medical plastic composite material and preparation method thereof Download PDFInfo
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- CN104387693A CN104387693A CN201410577693.0A CN201410577693A CN104387693A CN 104387693 A CN104387693 A CN 104387693A CN 201410577693 A CN201410577693 A CN 201410577693A CN 104387693 A CN104387693 A CN 104387693A
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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
-
- 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
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/9258—Velocity
-
- 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
-
- 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
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/02—Applications for biomedical use
-
- 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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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a medical plastic composite material and a preparation method thereof. The composite material comprises the following components: PVC, PP, PET, silica, polyglycerol ricinus communis oleate, lecithin, calcium carbonate, butyl rubber, acrylic acid, polyethylene glycol, glycerol, a light stabilizer, methacrylic acid and cellulose acetate. The preparation method comprises the following steps: uniformly mixing the components in a mixing stirrer, then putting the mixture into a reaction kettle, heating and stirring for reaction under the vacuum condition, then, cooling to enable the temperature to decrease to be 30-40 DEG C, adding 10-15 parts by weight of absolute ethyl alcohol, and heating and stirring for reaction, so as to obtain a mixed material I; performing vacuum drying on the mixed material I to obtain a dry material, then smashing the dry material by a smashing machine, discharging, and finally, extruding the material in a double-screw extruder, so as to obtain the medical plastic composite material. The medical plastic composite material provided by the invention has good performance, and has good DEHP migrating performance after being prepared into a packing material.
Description
Technical field
The invention belongs to medical article material field, particularly a kind of medical plastic matrix material and preparation method thereof.
Background technology
Polyvinyl chloride (PVC) is one of conventional medical macromolecular materials, can make blood storage bag, transfusion bags etc.Medical PVC blood bag uses mainly with soft goods form greatly, usually adopts the method for adding small molecules softening agent (as phthalate), reaches the object reducing material hardness.Small molecules softening agent (as phthalic acid two (2-ethyl) own ester DEHP) can constantly ooze out and move in PVC product use procedure, not only cause the decline of material property, reduction of service life, also can pollute the blood contacted with it, accumulate and the health of harmful to human (DEHP has been proved to be has certain damaging effect to the liver of people) in vivo.But research also finds, DEHP has the effect of hemolysis rate when reducing red cell preservation.Therefore people actively seek the stripping quantity that a kind of method can reduce DEHP, can ensure again the restraining effect of DEHP to erythrocyte hemolysis.At present in order to suppress migration of plasticizer in PVC, usually surface treatment can be adopted, as low-temperature plasma radiation, electron beam transmitting, uviolizing etc.But these method complex process, cost are high, limit their application.
Summary of the invention
The object of the invention is to provide a kind of medical plastic matrix material and preparation method thereof to overcome above the deficiencies in the prior art, improving the over-all properties of material, reduce DEHP transport property.
The present invention adopts following technique means to realize:
A kind of medical plastic matrix material, comprises in components by weight percent: PVC30-45 part, PP10-15 part, PET10-20 part, silicon-dioxide 0.8-2 part, Polyglycerine ricinoleate ester 1-4 part, Yelkin TTS 2-6 part, calcium carbonate 1-4 part, isoprene-isobutylene rubber 1-5 part, vinylformic acid 2-6 part, polyoxyethylene glycol 1-5 part, glycerine 2-5 part, methacrylic acid 1-5 part, rhodia 2-6 part.
Described medical plastic matrix material, can preferably comprise in components by weight percent: PVC36-42 part, PP12-14 part, PET15-18 part, silica 1-1.5 parts, Polyglycerine ricinoleate ester 2-4 part, Yelkin TTS 4-6 part, calcium carbonate 2-4 part, isoprene-isobutylene rubber 3-5 part, vinylformic acid 3-5 part, polyoxyethylene glycol 2-4 part, glycerine 3-5 part, methacrylic acid 2-4 part, rhodia 3-5 part.
Above-described medical plastic matrix material, described polyoxyethylene glycol can be Polyethylene Glycol-600.
The preparation method of the medical plastic matrix material described in more than one, comprises the following steps:
Step one, takes each component according to weight part;
Step 2, mixes each component in mixing and blending machine;
Step 3, material after mixing is put into reactor, be be heated to 100-120 DEG C under the condition of 0.01-0.04MPa in vacuum tightness, stir 10-20 minute, be cooled to 30-40 DEG C, add the dehydrated alcohol that weight part is 10-15 part, be warming up to 50-60 DEG C, stir 5-10 minute, obtain mixture one;
Step 4, carries out vacuum-drying by mixture one, obtains dry material;
Step 5, is crushed to 40-60 order by dry material by pulverizer, discharging;
Step 6, the material after step 5 being pulverized is extruded in twin screw extruder, and extrude Fen Siqu, first district's temperature is 180-190 DEG C, and second district's temperature is 195-200 DEG C, and the 3rd district's temperature is 200-210 DEG C, and the 4th district's temperature is 205-210 DEG C.
The preparation method of described medical plastic matrix material, the condition mixed in step 2 can be stirring velocity 300-350 rev/min, churning time 20-30 minute.
The preparation method of described medical plastic matrix material, the stirring velocity stirred in step 3 10-20 minute can be 60-70 rev/min, and the stirring velocity stirred 5-10 minute can be 120-150 rev/min.
The preparation method of described medical plastic matrix material, in step 4, vacuum drying temperature can be 60 DEG C.
Medical composite material provided by the invention has good performance, and wherein tensile strength reaches more than 22MPa, and elongation at break reaches more than 21%, and notched Izod impact strength reaches more than 125J/m.
Use medical composite material provided by the invention to prepare medical storage blood bag, its DEHP migration loss rate all reaches less than 1.2% when 50h, therefore has excellent anti-migration characteristic.
Embodiment
Embodiment 1
A kind of medical plastic matrix material, comprises in components by weight percent: PVC30 part, PP10 part, PET10 part, silicon-dioxide 0.8 part, Polyglycerine ricinoleate ester 1 part, 2 parts, Yelkin TTS, 1 part, calcium carbonate, isoprene-isobutylene rubber 1 part, 2 parts, vinylformic acid, Polyethylene Glycol-600 1 part, glycerine 2 parts, methacrylic acid 1 part, rhodia 2 parts.
The preparation method of above-described medical plastic matrix material, comprises the following steps:
Step one, takes each component according to weight part;
Step 2, mixes each component in mixing and blending machine, and condition is stirring velocity 300 revs/min, churning time 20 minutes;
Step 3, material after mixing is put into reactor, be be heated to 100 DEG C under the condition of 0.01MPa in vacuum tightness, stir 10 minutes, stirring velocity is 60 revs/min, be cooled to 30 DEG C, add the dehydrated alcohol that weight part is 10 parts, be warming up to 50 DEG C, stir 5 minutes, stirring velocity is 120 revs/min, obtains mixture one;
Step 4, carries out 60 DEG C of vacuum-dryings by mixture one, obtains dry material;
Step 5, is crushed to 40 orders by dry material by pulverizer, discharging;
Step 6, the material after step 5 being pulverized is extruded in twin screw extruder, and extrude Fen Siqu, first district's temperature is 180 DEG C, and second district's temperature is 195 DEG C, and the 3rd district's temperature is 200 DEG C, and the 4th district's temperature is 205 DEG C.
Embodiment 2
A kind of medical plastic matrix material, comprises in components by weight percent: PVC36 part, PP12 part, PET15 part, silica 1 part, Polyglycerine ricinoleate ester 2 parts, 4 parts, Yelkin TTS, 2 parts, calcium carbonate, isoprene-isobutylene rubber 3 parts, 3 parts, vinylformic acid, Polyethylene Glycol-600 2 parts, glycerine 3 parts, methacrylic acid 2 parts, rhodia 3 parts.
The preparation method of above-described medical plastic matrix material, comprises the following steps:
Step one, takes each component according to weight part;
Step 2, mixes each component in mixing and blending machine, and condition is stirring velocity 310 revs/min, churning time 22 minutes;
Step 3, material after mixing is put into reactor, be be heated to 105 DEG C under the condition of 0.02MPa in vacuum tightness, stir 13 minutes, stirring velocity is 64 revs/min, be cooled to 35 DEG C, add the dehydrated alcohol that weight part is 12 parts, be warming up to 55 DEG C, stir 6 minutes, stirring velocity is 130 revs/min, obtains mixture one;
Step 4, carries out 60 DEG C of vacuum-dryings by mixture one, obtains dry material;
Step 5, is crushed to 50 orders by dry material by pulverizer, discharging;
Step 6, the material after step 5 being pulverized is extruded in twin screw extruder, and extrude Fen Siqu, first district's temperature is 185 DEG C, and second district's temperature is 196 DEG C, and the 3rd district's temperature is 204 DEG C, and the 4th district's temperature is 206 DEG C.
Embodiment 3
A kind of medical plastic matrix material, comprises in components by weight percent: PVC40 part, PP13 part, PET16 part, silica 1 .3 part, Polyglycerine ricinoleate ester 3 parts, 5 parts, Yelkin TTS, 3 parts, calcium carbonate, isoprene-isobutylene rubber 4 parts, 4 parts, vinylformic acid, Polyethylene Glycol-600 3 parts, glycerine 4 parts, methacrylic acid 3 parts, rhodia 4 parts.
The preparation method of above-described medical plastic matrix material, comprises the following steps:
Step one, takes each component according to weight part;
Step 2, mixes each component in mixing and blending machine, and condition is stirring velocity 330 revs/min, churning time 25 minutes;
Step 3, material after mixing is put into reactor, be be heated to 110 DEG C under the condition of 0.03MPa in vacuum tightness, stir 18 minutes, stirring velocity is 65 revs/min, be cooled to 36 DEG C, add the dehydrated alcohol that weight part is 12 parts, be warming up to 58 DEG C, stir 7 minutes, stirring velocity is 140 revs/min, obtains mixture one;
Step 4, carries out 60 DEG C of vacuum-dryings by mixture one, obtains dry material;
Step 5, is crushed to 60 orders by dry material by pulverizer, discharging;
Step 6, the material after step 5 being pulverized is extruded in twin screw extruder, and extrude Fen Siqu, first district's temperature is 185 DEG C, and second district's temperature is 198 DEG C, and the 3rd district's temperature is 206 DEG C, and the 4th district's temperature is 208 DEG C.
Embodiment 4
A kind of medical plastic matrix material, comprises in components by weight percent: PVC42 part, PP14 part, PET18 part, silica 1 .5 part, Polyglycerine ricinoleate ester 4 parts, 6 parts, Yelkin TTS, 4 parts, calcium carbonate, isoprene-isobutylene rubber 5 parts, 5 parts, vinylformic acid, Polyethylene Glycol-600 4 parts, glycerine 5 parts, methacrylic acid 4 parts, rhodia 5 parts.
The preparation method of above-described medical plastic matrix material, comprises the following steps:
Step one, takes each component according to weight part;
Step 2, mixes each component in mixing and blending machine, and condition is stirring velocity 340 revs/min, churning time 30 minutes;
Step 3, material after mixing is put into reactor, be be heated to 110 DEG C under the condition of 0.03MPa in vacuum tightness, stir 20 minutes, stirring velocity is 70 revs/min, be cooled to 40 DEG C, add the dehydrated alcohol that weight part is 15 parts, be warming up to 58 DEG C, stir 8 minutes, stirring velocity is 145 revs/min, obtains mixture one;
Step 4, carries out 60 DEG C of vacuum-dryings by mixture one, obtains dry material;
Step 5, is crushed to 50 orders by dry material by pulverizer, discharging;
Step 6, the material after step 5 being pulverized is extruded in twin screw extruder, and extrude Fen Siqu, first district's temperature is 190 DEG C, and second district's temperature is 198 DEG C, and the 3rd district's temperature is 206 DEG C, and the 4th district's temperature is 207 DEG C.
Embodiment 5
A kind of medical plastic matrix material, comprises in components by weight percent: PVC45 part, PP15 part, PET20 part, silicon-dioxide 2 parts, Polyglycerine ricinoleate ester 4 parts, 6 parts, Yelkin TTS, 4 parts, calcium carbonate, isoprene-isobutylene rubber 5 parts, 6 parts, vinylformic acid, Polyethylene Glycol-600 5 parts, glycerine 5 parts, methacrylic acid 5 parts, rhodia 6 parts.
The preparation method of above-described medical plastic matrix material, comprises the following steps:
Step one, takes each component according to weight part;
Step 2, mixes each component in mixing and blending machine, and condition is stirring velocity 350 revs/min, churning time 30 minutes;
Step 3, material after mixing is put into reactor, be be heated to 120 DEG C under the condition of 0.04MPa in vacuum tightness, stir 20 minutes, stirring velocity is 70 revs/min, be cooled to 40 DEG C, add the dehydrated alcohol that weight part is 15 parts, be warming up to 60 DEG C, stir 10 minutes, stirring velocity is 150 revs/min, obtains mixture one;
Step 4, carries out 60 DEG C of vacuum-dryings by mixture one, obtains dry material;
Step 5, is crushed to 60 orders by dry material by pulverizer, discharging;
Step 6, the material after step 5 being pulverized is extruded in twin screw extruder, and extrude Fen Siqu, first district's temperature is 190 DEG C, and second district's temperature is 200 DEG C, and the 3rd district's temperature is 210 DEG C, and the 4th district's temperature is 210 DEG C.
Carry out performance test to the medical composite material that above embodiment prepares, result is as following table:
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Tensile strength MPa | 22 | 26 | 29 | 27 | 25 |
| Elongation at break % | 21 | 27 | 30 | 28 | 25 |
| Notched Izod impact strength J/m | 125 | 132 | 148 | 136 | 131 |
As can be seen from above test-results, medical composite material provided by the invention has good performance, and wherein tensile strength reaches more than 22MPa, and elongation at break reaches more than 21%, and notched Izod impact strength reaches more than 125J/m.
The matrix material that above embodiment prepares is prepared into medical storage blood bag, the DEHP migration performance of test bag, result is as follows:
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| DEHP migration loss rate/% (10h) | 0.5 | 0.4 | 0.2 | 0.3 | 0.4 |
| DEHP migration loss rate/% (20h) | 0.6 | 0.5 | 0.3 | 0.4 | 0.6 |
| DEHP migration loss rate/% (30h) | 0.9 | 0.8 | 0.4 | 0.6 | 0.7 |
| DEHP migration loss rate/% (40h) | 1.1 | 0.9 | 0.5 | 0.7 | 0.9 |
| DEHP migration loss rate/% (50h) | 1.2 | 1.0 | 0.6 | 0.8 | 1.1 |
As can be seen from above test-results, use medical composite material provided by the invention to prepare medical storage blood bag, its DEHP migration loss rate all reaches less than 1.2% when 50h, therefore has excellent anti-migration characteristic.
Claims (7)
1. a medical plastic matrix material, is characterized in that, comprises in components by weight percent: PVC30-45 part, PP10-15 part, PET10-20 part, silicon-dioxide 0.8-2 part, Polyglycerine ricinoleate ester 1-4 part, Yelkin TTS 2-6 part, calcium carbonate 1-4 part, isoprene-isobutylene rubber 1-5 part, vinylformic acid 2-6 part, polyoxyethylene glycol 1-5 part, glycerine 2-5 part, methacrylic acid 1-5 part, rhodia 2-6 part.
2. medical plastic matrix material according to claim 1, is characterized in that, comprise in components by weight percent: PVC36-42 part, PP12-14 part, PET15-18 part, silica 1-1.5 parts, Polyglycerine ricinoleate ester 2-4 part, Yelkin TTS 4-6 part, calcium carbonate 2-4 part, isoprene-isobutylene rubber 3-5 part, vinylformic acid 3-5 part, polyoxyethylene glycol 2-4 part, glycerine 3-5 part, methacrylic acid 2-4 part, rhodia 3-5 part.
3. medical plastic matrix material according to claim 1 and 2, is characterized in that, described polyoxyethylene glycol is Polyethylene Glycol-600.
4. a preparation method for the medical plastic matrix material described in claim 1 or 2, is characterized in that, comprise the following steps:
Step one, takes each component according to weight part;
Step 2, mixes each component in mixing and blending machine;
Step 3, material after mixing is put into reactor, be be heated to 100-120 DEG C under the condition of 0.01-0.04MPa in vacuum tightness, stir 10-20 minute, be cooled to 30-40 DEG C, add the dehydrated alcohol that weight part is 10-15 part, be warming up to 50-60 DEG C, stir 5-10 minute, obtain mixture one;
Step 4, carries out vacuum-drying by mixture one, obtains dry material;
Step 5, is crushed to 40-60 order by dry material by pulverizer, discharging;
Step 6, the material after step 5 being pulverized is extruded in twin screw extruder, and extrude Fen Siqu, first district's temperature is 180-190 DEG C, and second district's temperature is 195-200 DEG C, and the 3rd district's temperature is 200-210 DEG C, and the 4th district's temperature is 205-210 DEG C.
5. the preparation method of medical plastic matrix material according to claim 4, is characterized in that, the condition mixed in step 2 is stirring velocity 300-350 rev/min, churning time 20-30 minute.
6. the preparation method of medical plastic matrix material according to claim 4, is characterized in that, the stirring velocity stirred in step 3 10-20 minute is 60-70 rev/min, and the stirring velocity stirred 5-10 minute is 120-150 rev/min.
7. the preparation method of medical plastic matrix material according to claim 4, is characterized in that, in step 4, vacuum drying temperature is 60 DEG C.
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| CN201410577693.0A CN104387693A (en) | 2014-10-24 | 2014-10-24 | Medical plastic composite material and preparation method thereof |
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| CN201410577693.0A CN104387693A (en) | 2014-10-24 | 2014-10-24 | Medical plastic composite material and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104693662A (en) * | 2015-03-31 | 2015-06-10 | 苏州维泰生物技术有限公司 | Infusion rubber hose and preparation method thereof |
| CN104877182A (en) * | 2015-05-22 | 2015-09-02 | 苏州市贝克生物科技有限公司 | Method for preparing medical plastic |
| CN105017657A (en) * | 2015-06-30 | 2015-11-04 | 苏州乔纳森新材料科技有限公司 | Medical light blocking plastic, and preparation method thereof |
| CN105131473A (en) * | 2015-09-23 | 2015-12-09 | 江苏蓝湾生物科技有限公司 | Preparation method of high temperature resistant medical deodorization material |
| CN105153543A (en) * | 2015-09-23 | 2015-12-16 | 江苏蓝湾生物科技有限公司 | Preparation method of degradable medical packaging material |
| CN105754256A (en) * | 2016-03-28 | 2016-07-13 | 安徽鑫雅包装制品有限公司 | PVC (polyvinyl chloride) packing material and packing bag using same |
| CN106366484A (en) * | 2016-08-26 | 2017-02-01 | 桐城市中汇塑业有限公司 | Medical degradable package bag and preparation method of same |
| CN107674346A (en) * | 2017-11-14 | 2018-02-09 | 安徽省健源医疗器械设备有限公司 | A kind of medical pvc drops tube material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104693662A (en) * | 2015-03-31 | 2015-06-10 | 苏州维泰生物技术有限公司 | Infusion rubber hose and preparation method thereof |
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| CN105754256A (en) * | 2016-03-28 | 2016-07-13 | 安徽鑫雅包装制品有限公司 | PVC (polyvinyl chloride) packing material and packing bag using same |
| CN106366484A (en) * | 2016-08-26 | 2017-02-01 | 桐城市中汇塑业有限公司 | Medical degradable package bag and preparation method of same |
| CN107674346A (en) * | 2017-11-14 | 2018-02-09 | 安徽省健源医疗器械设备有限公司 | A kind of medical pvc drops tube material and preparation method thereof |
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Application publication date: 20150304 |