CN111892822A - Thermoplastic elastomer medical respirator material and processing method thereof - Google Patents
Thermoplastic elastomer medical respirator material and processing method thereof Download PDFInfo
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- CN111892822A CN111892822A CN202010734827.0A CN202010734827A CN111892822A CN 111892822 A CN111892822 A CN 111892822A CN 202010734827 A CN202010734827 A CN 202010734827A CN 111892822 A CN111892822 A CN 111892822A
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
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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
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- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a thermoplastic elastomer medical respirator material and a processing method thereof. The thermoplastic elastomer medical respirator material is prepared from the following components in percentage by weight: 30-50% of linear hydrogenated styrene-butadiene block copolymer, 30-50% of processing oil and 10-20% of polypropylene. The material processing technology comprises the following steps: adding a linear hydrogenated styrene-butadiene block copolymer to a process oil; oil absorption and standing; adding other components in the formula and mixing; melting and mixing the double screws; extruding and granulating; injection molding; and (5) blowing and demolding strongly. The material can meet the performance requirements of medical respirator materials on low odor, simple processing technology, environmental protection, recoverability, light weight, good rebound resilience, good touch feeling, good falling and shock resistance and good aging resistance, and meet the requirements of medical respirators on the diversity of material selection in the market.
Description
Technical Field
The invention relates to the field of material manufacturing, in particular to a thermoplastic elastomer medical respirator material and a processing method thereof.
Background
Most of medical respirator materials in the current market are made of materials such as polyvinyl chloride (PVC), silicon rubber and the like through different processing modes.
As is well known, although the material cost of polyvinyl chloride (PVC) is low, most PVC is not environment-friendly, has a large odor, and has the characteristics of complex processing procedures, high specific gravity, low temperature resistance, easy yellowing, high energy consumption, and adverse effects on human health and environmental protection.
Although the silicone rubber has the advantages of good elasticity, good touch, wear resistance, good temperature resistance and the like, the silicone rubber has high material cost and processing cost, large specific gravity, complex processing procedures and difficult recovery.
Disclosure of Invention
The invention aims to overcome the defects, solve the technical problems of the existing medical respirator materials, and take the diversity and selectivity of the materials as the starting point, and provides a novel thermoplastic elastomer medical respirator material and a processing method thereof so as to meet the performance requirements of the medical respirator materials in the market on low odor, simple processing technology, environmental protection, recoverability, light weight, good rebound resilience, good touch feeling, good falling and shock resistance and good aging resistance, and meet the requirement of the medical respirators in the market on the diversity of material selection.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the invention provides a thermoplastic elastomer medical respirator material which is prepared from the following components in percentage by weight: 30-50% of a linear hydrogenated styrene-butadiene block copolymer; 30-50% of processing oil; 10-20% of polypropylene.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the linear hydrogenated styrene-butadiene block copolymer is selected from one or more linear hydrogenated styrene-butadiene block copolymers with the solution viscosity within the range of 1500 to 2200 cps.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the linear hydrogenated styrene-butadiene block copolymer is one or more selected from linear hydrogenated styrene-butadiene block copolymers with high weight average molecular weight of more than 20 ten thousand.
In the present invention, the linear hydrogenated styrene-butadiene block copolymer having a high weight average molecular weight generally means a styrene-ethylene-butylene-styrene block copolymer (SEBS) having a weight average molecular weight of more than 20 ten thousand, and such a polymer having a weight average molecular weight of 20 to 30 ten thousand is preferably used.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the processing oil is one or more selected from processing oils with the kinematic viscosity (40 ℃) of 20-50, the CP value of 60-75% and the CN value of 25-40%.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the polypropylene is selected from one or more of polypropylene with the melt flow rate of 50-100 g/10 min.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the lubricant further comprises a processing aid, wherein the processing aid comprises a slipping agent and an internal lubricant; the total weight of the slipping agent and the internal lubricant is 0.1-1 wt% of the weight of all components without the processing aid.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the processing aid also comprises an antioxidant; the weight of the antioxidant is 0.1-1 wt% of the weight of all components without the processing aid.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the material has melt flow rate MFR more than or equal to 10g/10min at 180 ℃ and under the load of 5kg, and has good processability.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the hardness HS of the material is 45-55A, and the material has moderate hardness.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the resilience of the material is more than or equal to 50 percent, and the material has good resilience.
Further, the invention provides a thermoplastic elastomer medical respirator material, which also has the technical characteristics that: the light transmittance of the material under the thickness of 2mm is more than or equal to 80 percent, and the material has good transmittance.
The invention provides a processing method of a thermoplastic elastomer medical respirator material, which is characterized by comprising the following steps: the specific processing process flow is as follows:
process S1: adding a linear hydrogenated styrene-butadiene block copolymer to a process oil;
process S2: oil absorption and standing;
process S3: adding other components in the formula and mixing;
process S4: melting and mixing the double screws;
process S5: extruding and granulating;
process S6: injection molding;
process S7: blowing strong demoulding
Further, the invention provides a processing method of the thermoplastic elastomer medical respirator material, which also has the technical characteristics that: in the above-described flow S6:
the temperature of the feeding section is 160-170 ℃;
the temperature of the front section is 170-180 ℃;
the temperature of the middle section is 180-185 ℃;
the temperature of the rear section is 185-190 ℃;
the die head temperature is 190-200 ℃.
Further, the invention provides a processing method of the thermoplastic elastomer medical respirator material, which also has the technical characteristics that: in the above-mentioned process S4, during the twin-screw melt kneading, the odor and volatilized small molecules in the material are removed by vacuum-pumping to achieve the low odor performance.
Further, the invention provides a processing method of the thermoplastic elastomer medical respirator material, which also has the technical characteristics that: in the process S7, after the material is injection molded, demolding is performed by adopting a method of strong air blowing demolding, the stretching multiple after air blowing can reach three times without fracture, and the qualification rate reaches more than 95%.
The invention has the following functions and beneficial effects:
the thermoplastic elastomer medical respirator material is prepared by physically blending linear hydrogenated styrene-butadiene block copolymer (styrene-ethylene-butylene-styrene block copolymer, SEBS) elastomer in styrene elastomer (SBC) as a main body and processing oil, polypropylene, processing aids (including slipping agent, internal lubricant and antioxidant) and other materials in different proportions.
In the formula of the invention, the linear hydrogenated styrene-butadiene block copolymer (styrene-ethylene-butylene-styrene block copolymer, SEBS) elastomer provides main properties of the material, such as soft touch, elasticity, low temperature resistance, bending resistance, slip resistance, falling resistance, shock resistance and the like, the processing oil has the functions of improving fluidity and processability, the polypropylene can improve processability and thermal stability, the antioxidant provides oxygen resistance and thermal aging resistance, and the slipping agent can improve dry hand feeling of the material and improve processability of the material.
Compared with the traditional medical respirator material, as shown in figure 1, the thermoplastic elastomer medical respirator material disclosed by the invention has the excellent performances of novel material, excellent performance, recyclability, low odor, simple processing procedure, no toxicity, good wear resistance and rebound resilience, wide hardness range, light weight, comfortable hand feeling and the like.
Drawings
FIG. 1 is a schematic representation of a thermoplastic elastomer medical respirator as contemplated by an embodiment of the present invention.
Detailed Description
The formula in the embodiment of the invention abandons the main material system based on traditional materials such as polyvinyl chloride (PVC), silicon rubber and the like in the market, selects a formula system which takes linear hydrogenated styrene-butadiene block copolymer (styrene-ethylene-butylene-styrene block copolymer, SEBS) elastomer in styrene elastomer (SBC) as a main body and is assisted by a small amount of processing oil, polypropylene (PP), Antioxidant (AO), slipping agent, internal lubricant and the like.
The first embodiment,
The formulation of the thermoplastic elastomer medical respirator material in this example is as follows:
| raw materials | Weight percent (wt%) |
| SEBS-6151 | 40 |
| Oil-150N | 45 |
| PP-5600XT | 15 |
| Slipping agent erucamide | 0.06 |
| Internal lubricant ZnSA | 0.1 |
| AO-50 | 0.1 |
The processing method of the thermoplastic elastomer medical respirator material in the embodiment comprises the following specific processing process flows: process S1: adding a linear hydrogenated styrene-butadiene block copolymer into the processing oil; process S2: oil absorption and standing; process S3: adding other components in the formula and mixing; process S4: melting and mixing the double screws; s5 extruding and granulating; process S6: injection molding; s7: and (5) blowing and demolding strongly.
In the above-mentioned process S4, during the twin-screw melt kneading, the odor and volatilized small molecules in the material are removed by vacuum-pumping to achieve the low odor performance.
The processing parameters of the above flow S6 are as follows:
| temperature of the barrel | Set value |
| Temperature of the feed zone | 160℃ |
| Front section temperature | 170℃ |
| Middle section temperature | 180℃ |
| Back end temperature | 185℃ |
| Die temperature | 190℃ |
In the process S7, after the material is injection molded, demolding is performed by adopting a method of strong air blowing demolding, the stretching multiple after air blowing can reach three times without fracture, and the qualification rate reaches more than 95%.
Other embodiments of the invention:
example II,
The formulation of the thermoplastic elastomer medical respirator material in this example is as follows:
| raw materials | Weight percent (wt%) |
| SEBS-YH602 | 40 |
| Oil-150N | 45 |
| PP-5600XT | 15 |
| Slipping agent erucamide | 0.1 |
| Internal lubricant ZnSA | 0.1 |
| AO-50 | 0.1 |
The processing method of the thermoplastic elastomer medical respirator material in the embodiment comprises the following specific processing process flows: process S1: adding a linear hydrogenated styrene-butadiene block copolymer into the processing oil; process S2: oil absorption and standing; process S3: adding other components in the formula and mixing; process S4: melting and mixing the double screws; s5 extruding and granulating; process S6: injection molding; s7: and (5) blowing and demolding strongly.
In the above-mentioned process S4, during the twin-screw melt kneading, the odor and volatilized small molecules in the material are removed by vacuum-pumping to achieve the low odor performance.
The processing parameters of the above flow S6 are as follows:
| temperature of the barrel | Set value |
| Temperature of the feed zone | 170℃ |
| Front section temperature | 180℃ |
| Middle section temperature | 185℃ |
| Back end temperature | 190℃ |
| Die temperature | 200℃ |
In the process S7, after the material is injection molded, demolding is performed by adopting a method of strong air blowing demolding, the stretching multiple after air blowing can reach three times without fracture, and the qualification rate reaches more than 95%.
Example III,
The formulation of the thermoplastic elastomer medical respirator material in this example is as follows:
| raw materials | Weight percent (wt%) |
| SEBS-6151 | 40 |
| Oil-150N | 45 |
| PP-4912 | 15 |
| Slipping agent erucamide | 0.06 |
| Internal lubricant ZnSA | 0.1 |
| AO-50 | 0.1 |
The processing method of the thermoplastic elastomer medical respirator material in the embodiment comprises the following specific processing process flows: process S1: adding a linear hydrogenated styrene-butadiene block copolymer into the processing oil; process S2: oil absorption and standing; process S3: adding other components in the formula and mixing; process S4: melting and mixing the double screws; s5 extruding and granulating; process S6: injection molding; s7: and (5) blowing and demolding strongly.
In the above-mentioned process S4, during the twin-screw melt kneading, the odor and volatilized small molecules in the material are removed by vacuum-pumping to achieve the low odor performance.
The processing parameters of the above flow S6 are as follows:
in the process S7, after the material is injection molded, demolding is performed by adopting a method of strong air blowing demolding, the stretching multiple after air blowing can reach three times without fracture, and the qualification rate reaches more than 95%.
Example four,
The formulation of the thermoplastic elastomer medical respirator material in this example is as follows:
| raw materials | Weight percent (wt%) |
| SEBS-6151 | 40 |
| Oil-150N | 50 |
| PP-5600XT | 10 |
| Slipping agent erucamide | 0.06 |
| Internal lubricant ZnSA | 0.1 |
| AO-50 | 0.1 |
The processing method of the thermoplastic elastomer medical respirator material in the embodiment comprises the following specific processing process flows: process S1: adding a linear hydrogenated styrene-butadiene block copolymer into the processing oil; process S2: oil absorption and standing; process S3: adding other components in the formula and mixing; process S4: melting and mixing the double screws; s5 extruding and granulating; process S6: injection molding; s7: and (5) blowing and demolding strongly.
In the above-mentioned process S4, during the twin-screw melt kneading, the odor and volatilized small molecules in the material are removed by vacuum-pumping to achieve the low odor performance.
The processing parameters of the above flow S6 are as follows:
| temperature of the barrel | Set value |
| Temperature of the feed zone | 160℃ |
| Front section temperature | 170℃ |
| Middle section temperature | 180℃ |
| Back end temperature | 185℃ |
| Die temperature | 190℃ |
In the process S7, after the material is injection molded, demolding is performed by adopting a method of strong air blowing demolding, the stretching multiple after air blowing can reach three times without fracture, and the qualification rate reaches more than 95%.
The basic formula is a formula system taking styrene as a main body, belongs to the modification of polymers, and adopts mechanical double-screw physical blending modification.
Performance test results for the thermoplastic elastomer medical respirator materials of examples one through four above:
watch 1
In Table I, MFR (melt flow rate) represents the flowability of the material, which reflects the processability of the material, and in general, MFR is more than 10g/10min, which represents better processability; HS represents the hardness of the material, the larger the HS value is, the harder the material is, and conversely, the softer the material is, the hardness of the material for the medical respirator is basically required to be 45A-55A, the material has better hand feeling about 50A, and the material has enough rebound resilience; the greater the Sp.Gr value, the greater the weight per unit volume of the material, and the smaller the value, the lighter the material; the rebond represents the rebound resilience of the material, the larger the rebond value is, the better the rebound resilience of the material is represented, the smaller the value is, the poorer the rebound resilience of the material is represented, and generally, the rebond >50 is better; the light transmittance represents the transparency of the material after the material is formed into a product, and the larger the light transmittance value is, the better the transparency of the material is. From the scheme, the thermoplastic elastomer material is used as a medical respirator material, the MFR is larger than or equal to 10g/10min, the better the processing performance is, the smaller the Sp.Gr is, the larger the rebond is, the better the light transmittance is, and the better the light transmittance is. As can be seen from table one, the properties (performance indexes) of the thermoplastic elastomer materials in the first to fourth embodiments of the present invention, such as flowability (MFR), Hardness (HS), resilience (rebound), light transmittance, and specific gravity (sp.gr), can meet the basic requirements of medical respirator materials and are better than those in the comparative example, which indicates that the thermoplastic elastomer medical respirator materials in the first to fourth embodiments of the present invention have comprehensive properties, such as good processability, light specific gravity, and high light transmittance, compared with the silica gel materials in the comparative example; compared with the polyvinyl chloride material of the comparative example, the thermoplastic elastomer medical respirator material of the first to fourth embodiments of the invention has the comprehensive properties of light specific gravity, good rebound resilience, high light transmittance and the like.
In the present invention, regarding the selection of the styrenic elastomer (SBC): most of styrene elastomers (SBC) currently used in the market mainly include hydrogenated styrene-butadiene block copolymers (styrene-ethylene-butylene-styrene block copolymers, SEBS), unhydrogenated styrene-butadiene block copolymers (styrene-butadiene-styrene block copolymers, SBS), and unhydrogenated styrene-isoprene-styrene (styrene-isoprene-styrene block copolymers, SIS), in which SBS has low price, simple processing procedure, wide sources and wide application, but SBS has slightly poor high and low temperature resistance, touch, aging resistance and other properties. SIS has simple processing procedure and moderate price, but has poor performances such as high and low temperature resistance, touch, heat aging resistance, processability, touch and the like, and has narrow application range. The SEBS has moderate price, wide source and wide application range, and the performances of slip resistance, elasticity, touch feeling, low temperature resistance, heat aging resistance and the like are obviously superior to those of other common styrene elastomers, so that the linear hydrogenated styrene-butadiene block copolymer (SEBS) elastomer is selected as the main material of the formula. According to the requirements of the product, the factors such as the weight average molecular weight, the heat aging resistance, the source, the price, the quality stability and the like of the SEBS are comprehensively considered, the linear hydrogenated styrene-butadiene block copolymer with the solution viscosity within the range of 1500-2200 cps is preferably selected in the formula, and the SEBS-6151 with high weight average molecular weight produced by Takekuwa (Shanghai) industries limited company and the SEBS-YH602 produced by Baling petrochemical division of China petrochemical group are optimally selected as main materials in the first to fourth embodiments of the invention.
Regarding the choice of process oil: based on the consideration of material compatibility, the 150N paraffin hydrocarbon Oil (Oil-150N) which has better compatibility with other materials in the formula, moderate viscosity and better thermal aging resistance is selected for the formulas of the first to fourth embodiments of the invention.
Regarding the choice of polypropylene: in terms of the selection of polypropylene, based on the requirements of product properties, the polypropylene with the melt flow rate of 50-100 g/10min under the load of 2.16KG at 230 ℃ is selected in the formulas of the first to fourth embodiments of the invention, the high-fluidity PP-5600XT (co-polypropylene) produced by Taiwan plastic industries and the high-transparency PP-4912 produced by Shanghai Seisaku petrochemical company are optimally selected to provide proper fluidity and processability, and high transparency.
Regarding the choice of antioxidant: any type of antioxidant can be selected, and the most preferable antioxidant AO-50 produced in Taiwan Changchun chemical industry in the market is wide, so as to meet the requirements of the medical respirator on oxygen resistance and aging resistance.
Regarding the selection of the slip agent: according to the requirements of product properties, the molecular weight of the selected slipping agent erucamide is higher than about 400-500, so that better dispersibility and slipping effect can be provided; the zinc stearate ZnSA as the internal lubricant selected in the embodiment of the invention can improve the processing performance of the material and reduce partial shearing force when the material is melted and mixed, so that the material has better processing performance.
Claims (15)
1. The thermoplastic elastomer medical respirator material is characterized by being prepared from the following components in percentage by weight: 30-50% of a linear hydrogenated styrene-butadiene block copolymer; 30-50% of processing oil; 10-20% of polypropylene.
2. A thermoplastic elastomer medical respirator material of claim 1, wherein: the linear hydrogenated styrene-butadiene block copolymer is selected from one or more linear hydrogenated styrene-butadiene block copolymers with the solution viscosity within the range of 1500 to 2200 cps.
3. A thermoplastic elastomer medical respirator material of claim 1, wherein: the linear hydrogenated styrene-butadiene block copolymer is one or more selected from linear hydrogenated styrene-butadiene block copolymers with high weight average molecular weight of more than 20 ten thousand.
4. A thermoplastic elastomer medical respirator material of claim 1, wherein: the processing oil is one or more selected from processing oils with the kinematic viscosity of 20-50 at 40 ℃, the CP value of 60-75% and the CN value of 25-40%.
5. A thermoplastic elastomer medical respirator material of claim 1, wherein: the polypropylene is selected from one or more of polypropylene with the melt flow rate of 50-100 g/10 min.
6. A thermoplastic elastomer medical respirator material of claim 1, wherein: the lubricant further comprises a processing aid, wherein the processing aid comprises a slipping agent and an internal lubricant; the total weight of the slipping agent and the internal lubricant is 0.1-1 wt% of the weight of all components without the processing aid.
7. The thermoplastic elastomer medical respirator material of claim 6, wherein: the processing aid further comprises an antioxidant; the weight of the antioxidant is 0.1-1 wt% of the weight of all components without the processing aid.
8. The thermoplastic elastomer medical respirator material of claim 1, wherein the melt flow rate is greater than or equal to 10g/10min at 180 ℃ under a load of 5 kg.
9. The thermoplastic elastomer medical respirator material of claim 1, wherein the material has a hardness HS of 45A to 55A.
10. The thermoplastic elastomer medical respirator material of claim 1, wherein the material has a rebound of 50% or greater.
11. The thermoplastic elastomer medical respirator material of claim 1, wherein the material has a light transmittance of 80% or more at a thickness of 2 mm.
12. A method of processing thermoplastic elastomer medical respirator material of any of claims 1-11, wherein: the specific processing process flow is as follows: process S1: adding a linear hydrogenated styrene-butadiene block copolymer to a process oil; process S2: oil absorption and standing; process S3: adding other components in the formula and mixing; process S4: melting and mixing the double screws; process S5: extruding and granulating; process S6: injection molding; process S7: and (5) blowing and demolding strongly.
13. A method of processing thermoplastic elastomer medical respirator material of claim 12, wherein: in the flow S6:
the temperature of the feeding section is 160-170 ℃;
the temperature of the front section is 170-180 ℃;
the temperature of the middle section is 180-185 ℃;
the temperature of the rear section is 185-190 ℃;
the die head temperature is 190-200 ℃.
14. A method of processing thermoplastic elastomer medical respirator material of claim 12, wherein: in the process of S4, during the twin-screw melt-kneading, the odor and volatilized small molecules in the material are removed by vacuum-pumping, so as to achieve the low-odor performance.
15. A method of processing thermoplastic elastomer medical respirator material of claim 12, wherein: in the process S7, after injection molding, demolding is carried out by adopting a method of strong demolding by air blowing, the stretching multiple after air blowing can reach 3 times without cracking, and the qualification rate can reach more than 95%.
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| CN114085486A (en) * | 2021-12-30 | 2022-02-25 | 上海马可菲斯医疗技术有限公司 | Thermoplastic elastomer rubber band for orthodontic treatment and preparation method thereof |
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