CN113429792A - High-elongation high-strength precipitation gel material for producing medical negative pressure ball - Google Patents
High-elongation high-strength precipitation gel material for producing medical negative pressure ball Download PDFInfo
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- CN113429792A CN113429792A CN202110381151.6A CN202110381151A CN113429792A CN 113429792 A CN113429792 A CN 113429792A CN 202110381151 A CN202110381151 A CN 202110381151A CN 113429792 A CN113429792 A CN 113429792A
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- 239000000463 material Substances 0.000 title claims abstract description 87
- 238000001556 precipitation Methods 0.000 title claims abstract description 29
- 229920001971 elastomer Polymers 0.000 claims abstract description 90
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 83
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 83
- 229920002545 silicone oil Polymers 0.000 claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 35
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 25
- 239000006229 carbon black Substances 0.000 claims abstract description 18
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 17
- 239000004945 silicone rubber Substances 0.000 claims abstract description 16
- 239000003292 glue Substances 0.000 claims abstract description 15
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- 239000006082 mold release agent Substances 0.000 claims abstract description 3
- 238000004073 vulcanization Methods 0.000 claims description 28
- 238000005520 cutting process Methods 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000010074 rubber mixing Methods 0.000 claims description 6
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical group [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 abstract description 6
- 238000013329 compounding Methods 0.000 abstract 1
- 239000000499 gel Substances 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 10
- VLKZOEOYAKHREP-UHFFFAOYSA-N methyl pentane Natural products CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 10
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 210000005077 saccule Anatomy 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
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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
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- 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
- C08K2201/006—Additives being defined by their surface area
-
- 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
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- 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)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-elongation high-strength precipitation glue material for producing a medical negative pressure ball, which comprises the following components in percentage by weight: 100-200 parts of methyl vinyl silicone rubber crude rubber, 20-60 parts of precipitated white carbon black, 3-10 parts of hydroxyl silicone oil, 0.5-1 part of hydrogen-containing silicone oil, 0.1-0.5 part of vinyl silicone oil, 1-3 parts of vulcanizing agent and 0.1-0.5 part of mold release agent; the raw methyl vinyl silicone rubber comprises raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, and the weight ratio of the raw rubber to the raw rubber is 6-8: 92-94. The high-elongation high-strength precipitation glue material for producing the medical negative pressure ball is prepared by compounding raw glue with ultrahigh vinyl content and raw glue with low vinyl content, so that the vulcanized glue material forms a sea-island cross-linking structure with local high-density cross-linking points, and the obtained precipitation glue material is easy to open and mill, free from roller sticking, easy to slice and good in strength and tear resistance.
Description
Technical Field
The invention belongs to the technical field of silicon rubber materials, and particularly relates to a high-elongation high-strength precipitation rubber material for producing a medical negative pressure ball.
Background
The silica gel negative pressure ball is widely applied to the medical industry due to the characteristics of environmental protection and no toxicity. However, the silica gel saccule is large in the middle and small in two ends, so that the formed expanded spherical mold core is difficult to be separated from the small openings in the two ends of the saccule, the product is easy to be damaged in the separation process, and the product yield is greatly influenced. Most of the products in the market are mainly produced by gas-phase glue, and the gas-phase glue has the advantages of excellent performance, easy mold sticking and insufficient product elasticity.
Therefore, the above problems need to be solved.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide a high-elongation high-strength precipitation glue material for producing medical negative pressure balls, which is easy to roll, does not stick to a roller, is easy to fall, and has good strength and tear resistance.
The technical scheme is as follows: in order to achieve the aim, the invention provides a high-elongation high-strength precipitation glue material for producing a medical negative pressure ball, which comprises the following components in percentage by weight: 100-200 parts of methyl vinyl silicone rubber crude rubber, 20-60 parts of precipitated white carbon black, 3-10 parts of hydroxyl silicone oil, 0.5-1 part of hydrogen-containing silicone oil, 0.1-0.5 part of vinyl silicone oil, 1-3 parts of vulcanizing agent and 0.1-0.5 part of mold release agent; the raw methyl vinyl silicone rubber comprises raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, and the weight ratio is 6-8: 92-94.
Further, the high-elongation high-strength precipitated silica material for producing the medical negative pressure ball has the specific surface area of 175 +/-15 m2/g。
Further, the high-elongation high-strength precipitation gel material for producing the medical negative pressure ball is characterized in that the hydroxyl silicone oil has a hydroxyl mole fraction of 5%.
Further, the vinyl silicone oil used for producing the high-elongation high-strength precipitation gel material for the medical negative pressure ball has a vinyl content of 9.5%.
Further, the vulcanizing agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane.
Further, the high-elongation high-strength precipitation glue material for producing the medical negative pressure ball is characterized in that the release agent is zinc stearate.
Further, the high-elongation high-strength precipitation gel material for producing the medical negative pressure ball is characterized in that the vinyl mole fraction of the raw gel PS01 with the ultrahigh vinyl content is 3.0%, and the weight average relative molecular mass is 60 ten thousand; the vinyl mole fraction of the raw rubber PS02 with low vinyl content is 0.06%, and the weight average relative molecular mass is 62 ten thousand.
Further, the preparation method of the high-elongation high-strength precipitation gel material for producing the medical negative pressure ball comprises the following steps:
putting raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content on an open mill, and mixing to a wrapping roller;
secondly, adding precipitated white carbon black, hydroxyl silicone oil, hydrogen-containing silicone oil and vinyl silicone oil into an open mill step by step, and repeatedly cutting to ensure that the rubber material is mixed uniformly without bubbles and burrs and then is formed into sheets;
thirdly, putting the uniformly mixed rubber material into a constant-temperature blowing oven at 190 ℃ for heat treatment for 3 hours;
cooling for 2h, putting the mixture into a rubber mixing mill for remilling, wrapping a roller, cutting left and right to enable the rubber material to be uniform, and discharging sheets after no burrs;
after the rubber material after being back-smelted is coated on a roller in an open mill, gradually adding a vulcanizing agent and a release agent in small amount, cutting left and right, performing triangular coating, uniformly mixing, and adjusting the roller spacing to obtain a lower sheet, wherein the thickness of the rubber material is 2.2-2.5 mm;
sixthly, quickly putting the rubber compound obtained in the fifth step into a preheated mould, and performing first-stage vulcanization on a flat vulcanizing machine; and then carrying out second-stage vulcanization in an electric heating blowing dry box to obtain the high-elongation high-strength precipitated gel material for producing the medical negative pressure ball.
Further, the high-elongation high-strength precipitation gel material for producing the medical negative pressure ball is vulcanized for 20min under the conditions of 10MPa and 175 ℃; the secondary vulcanization is carried out for 4 hours at the temperature of 200 ℃.
The technical scheme shows that the invention has the following beneficial effects:
1. the precipitated white carbon black used for producing the high-elongation high-strength precipitated adhesive material for the medical negative pressure ball has a large specific surface area, can fully act with raw rubber, has a good reinforcing effect, can improve the tear resistance of the adhesive material, is not adhered to a roller, and is easy to discharge;
2. the high-elongation high-strength precipitation rubber material for producing the medical negative pressure ball is compounded by raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, so that the vulcanized rubber material forms a sea-island cross-linking structure with local high-density cross-linking points, a cross-linking network of the rubber material has higher deformation rate, is suitable for large elongation and large deformation, and has proper amount of a plurality of cross-linking points to form a framework stress structure, thereby improving the strength and the tear resistance;
3. the high-elongation high-strength precipitation glue material for producing the medical negative pressure ball is easy to open and mill, does not stick to a roller, does not fall off blocks, is easy to color and mix, and is easy to discharge; the Shore hardness is within the range of 45-55 degrees, the tensile strength of the rubber material reaches more than 8.8, the elongation rate reaches more than 720%, the tearing strength reaches more than 37.6N/m, and the product is not adhered to a mold in the production process, easy to tear edges and smooth in surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments and specific experimental data, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high-elongation high-strength precipitation gel material for producing medical negative pressure balls comprises the following components in percentage by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 20 parts of precipitated white carbon black, 3 parts of hydroxyl silicone oil, 0.5 part of hydrogen-containing silicone oil, 0.1 part of vinyl silicone oil, 1 part of vulcanizing agent and 0.1 part of release agent; wherein the raw methyl vinyl silicone rubber comprises raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, and the weight ratio is 6: 94.
Wherein the specific surface area of the precipitated white carbon black is 175 +/-15 m2/g。
And the hydroxyl silicone oil has a hydroxyl group molar fraction of 5%.
And the vinyl silicone oil has a vinyl content of 9.5%.
The vulcanizing agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane.
And the release agent is zinc stearate.
Further, the vinyl mole fraction of the raw rubber PS01 with the ultrahigh vinyl content is 3.0 percent, and the weight average relative molecular mass is 60 ten thousand; the vinyl mole fraction of the raw rubber PS02 with low vinyl content is 0.06%, and the weight average relative molecular mass is 62 ten thousand.
In addition, the preparation method of the precipitated gel material comprises the following steps:
putting raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content on an open mill, and mixing to a wrapping roller;
secondly, adding precipitated white carbon black, hydroxyl silicone oil, hydrogen-containing silicone oil and vinyl silicone oil into an open mill step by step, and repeatedly cutting to ensure that the rubber material is mixed uniformly without bubbles and burrs and then is formed into sheets;
thirdly, putting the uniformly mixed rubber material into a constant-temperature blowing oven at 190 ℃ for heat treatment for 3 hours;
cooling for 2h, putting the mixture into a rubber mixing mill for remilling, wrapping a roller, cutting left and right to enable the rubber material to be uniform, and discharging sheets after no burrs;
after the rubber material after being back-smelted is coated on a roller in an open mill, gradually adding a vulcanizing agent and a release agent in small amount, cutting left and right, performing triangular coating, uniformly mixing, and adjusting the roller spacing to obtain a lower sheet, wherein the thickness of the rubber material is 2.2-2.5 mm;
sixthly, quickly putting the rubber compound obtained in the fifth step into a preheated mould, and performing first-stage vulcanization on a flat vulcanizing machine; and then carrying out second-stage vulcanization in an electric heating blowing dry box to obtain the high-elongation high-strength precipitated gel material for producing the medical negative pressure ball.
And the first-stage vulcanization is vulcanization for 20min under the conditions of 10MPa and 175 ℃; the secondary vulcanization is carried out for 4 hours at the temperature of 200 ℃.
Example 2
A high-elongation high-strength precipitation gel material for producing medical negative pressure balls comprises the following components in percentage by weight: 200 parts of methyl vinyl silicone rubber crude rubber, 60 parts of precipitated white carbon black, 10 parts of hydroxyl silicone oil, 1 part of hydrogen-containing silicone oil, 0.5 part of vinyl silicone oil, 3 parts of vulcanizing agent and 0.5 part of release agent; wherein the raw methyl vinyl silicone rubber comprises raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, and the weight ratio is 8: 92.
Wherein the specific surface area of the precipitated white carbon black is 190m2/g。
And the hydroxyl silicone oil has a hydroxyl group molar fraction of 5%.
And the vinyl silicone oil has a vinyl content of 9.5%.
The vulcanizing agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane.
And the release agent is zinc stearate.
Further, the vinyl mole fraction of the raw rubber PS01 with the ultrahigh vinyl content is 3.0 percent, and the weight average relative molecular mass is 60 ten thousand; the vinyl mole fraction of the raw rubber PS02 with low vinyl content is 0.06%, and the weight average relative molecular mass is 62 ten thousand.
In addition, the preparation method of the precipitated gel material comprises the following steps:
putting raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content on an open mill, and mixing to a wrapping roller;
secondly, adding precipitated white carbon black, hydroxyl silicone oil, hydrogen-containing silicone oil and vinyl silicone oil into an open mill step by step, and repeatedly cutting to ensure that the rubber material is mixed uniformly without bubbles and burrs and then is formed into sheets;
thirdly, putting the uniformly mixed rubber material into a constant-temperature blowing oven at 190 ℃ for heat treatment for 3 hours;
cooling for 2h, putting the mixture into a rubber mixing mill for remilling, wrapping a roller, cutting left and right to enable the rubber material to be uniform, and discharging sheets after no burrs;
after the rubber material after being back-smelted is coated on a roller in an open mill, gradually adding a vulcanizing agent and a release agent in small amount, cutting left and right, packaging in a triangular bag, mixing uniformly, adjusting the roller distance and feeding the rubber material with the thickness of 2.5 mm;
sixthly, quickly putting the rubber compound obtained in the fifth step into a preheated mould, and performing first-stage vulcanization on a flat vulcanizing machine; and then carrying out second-stage vulcanization in an electric heating blowing dry box to obtain the high-elongation high-strength precipitated gel material for producing the medical negative pressure ball.
And the first-stage vulcanization is vulcanization for 20min under the conditions of 10MPa and 175 ℃; the secondary vulcanization is carried out for 4 hours at the temperature of 200 ℃.
Example 3
A high-elongation high-strength precipitation gel material for producing medical negative pressure balls comprises the following components in percentage by weight: 150 parts of methyl vinyl silicone rubber crude rubber, 40 parts of precipitated white carbon black, 6.5 parts of hydroxyl silicone oil, 0.75 part of hydrogen-containing silicone oil, 0.3 part of vinyl silicone oil, 2 parts of vulcanizing agent and 0.3 part of release agent; wherein the raw methyl vinyl silicone rubber comprises raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, and the weight ratio is 7: 93.
Wherein the specific surface area of the precipitated white carbon black is 185m2/g。
And the hydroxyl silicone oil has a hydroxyl group molar fraction of 5%.
And the vinyl silicone oil has a vinyl content of 9.5%.
The vulcanizing agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane.
And the release agent is zinc stearate.
Further, the vinyl mole fraction of the raw rubber PS01 with the ultrahigh vinyl content is 3.0 percent, and the weight average relative molecular mass is 60 ten thousand; the vinyl mole fraction of the raw rubber PS02 with low vinyl content is 0.06%, and the weight average relative molecular mass is 62 ten thousand.
In addition, the preparation method of the precipitated gel material comprises the following steps:
putting raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content on an open mill, and mixing to a wrapping roller;
secondly, adding precipitated white carbon black, hydroxyl silicone oil, hydrogen-containing silicone oil and vinyl silicone oil into an open mill step by step, and repeatedly cutting to ensure that the rubber material is mixed uniformly without bubbles and burrs and then is formed into sheets;
thirdly, putting the uniformly mixed rubber material into a constant-temperature blowing oven at 190 ℃ for heat treatment for 3 hours;
cooling for 2h, putting the mixture into a rubber mixing mill for remilling, wrapping a roller, cutting left and right to enable the rubber material to be uniform, and discharging sheets after no burrs;
after the rubber material after being back-smelted is coated on a roller in an open mill, gradually adding a vulcanizing agent and a release agent in small amount, cutting left and right, packaging in a triangular bag, mixing uniformly, adjusting the roller distance and feeding the rubber material with the thickness of 2.3 mm;
sixthly, quickly putting the rubber compound obtained in the fifth step into a preheated mould, and performing first-stage vulcanization on a flat vulcanizing machine; and then carrying out second-stage vulcanization in an electric heating blowing dry box to obtain the high-elongation high-strength precipitated gel material for producing the medical negative pressure ball.
And the first-stage vulcanization is vulcanization for 20min under the conditions of 10MPa and 175 ℃; the secondary vulcanization is carried out for 4 hours at the temperature of 200 ℃.
Example 4
A high-elongation high-strength precipitation gel material for producing medical negative pressure balls comprises the following components in percentage by weight: 120 parts of methyl vinyl silicone rubber crude rubber, 60 parts of precipitated white carbon black, 6.6 parts of hydroxyl silicone oil, 0.5 part of hydrogen-containing silicone oil, 0.1 part of vinyl silicone oil, 2 parts of vulcanizing agent and 0.3 part of release agent; wherein the raw methyl vinyl silicone rubber comprises raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, and the weight ratio is 6: 94.
Wherein the specific surface area of the precipitated white carbon black is 180m2/g。
And the hydroxyl silicone oil has a hydroxyl group molar fraction of 5%.
The vulcanizing agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane.
And the release agent is zinc stearate.
And the vinyl silicone oil has a vinyl content of 9.5%.
Further, the vinyl mole fraction of the raw rubber PS01 with the ultrahigh vinyl content is 3.0 percent, and the weight average relative molecular mass is 60 ten thousand; the vinyl mole fraction of the raw rubber PS02 with low vinyl content is 0.06%, and the weight average relative molecular mass is 62 ten thousand.
In addition, the preparation method of the precipitated gel material comprises the following steps:
putting raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content on an open mill, and mixing to a wrapping roller;
secondly, adding precipitated white carbon black, hydroxyl silicone oil, hydrogen-containing silicone oil and vinyl silicone oil into an open mill step by step, and repeatedly cutting to ensure that the rubber material is mixed uniformly without bubbles and burrs and then is formed into sheets;
thirdly, putting the uniformly mixed rubber material into a constant-temperature blowing oven at 190 ℃ for heat treatment for 3 hours;
cooling for 2h, putting the mixture into a rubber mixing mill for remilling, wrapping a roller, cutting left and right to enable the rubber material to be uniform, and discharging sheets after no burrs;
after the rubber material after being back-smelted is coated on a roller in an open mill, gradually adding a vulcanizing agent and a release agent in small amount, cutting left and right, packaging in a triangular bag, mixing uniformly, adjusting the roller distance and feeding the rubber material with the thickness of 2.2 mm;
sixthly, quickly putting the rubber compound obtained in the fifth step into a preheated mould, and performing first-stage vulcanization on a flat vulcanizing machine; and then carrying out second-stage vulcanization in an electric heating blowing dry box to obtain the high-elongation high-strength precipitated gel material for producing the medical negative pressure ball.
And the first-stage vulcanization is vulcanization for 20min under the conditions of 10MPa and 175 ℃; the secondary vulcanization is carried out for 4 hours at the temperature of 200 ℃.
Comparative example 1
The precipitated gel material of the present comparative example is different from the high elongation and high strength precipitated gel material for manufacturing a medical negative pressure balloon described in example 4 only in that the weight ratio of the ultra-high vinyl content raw gel PS01 to the low vinyl content raw gel PS02 in the present comparative example is 10: 90.
The precipitated gel material described in this comparative example was prepared in the same manner as in example 4.
Comparative example 2
The precipitated gel material of the present comparative example is different from the high elongation and high strength precipitated gel material for manufacturing a medical negative pressure balloon described in example 4 only in that the weight ratio of the ultra-high vinyl content raw gel PS01 to the low vinyl content raw gel PS02 in the present comparative example is 20: 80.
The precipitated gel material described in this comparative example was prepared in the same manner as in example 4.
Test example
The high-strength high-tensile silicone rubber materials for medical negative pressure balloons prepared in examples 1 to 4 and the ordinary high-tensile silicone rubber materials prepared in comparative examples 1 to 2 were subjected to performance tests according to the methods in the following standards:
shore A hardness: testing the hardness according to GB/T531.1-2008 by using a Shore A type durometer;
tensile strength and elongation at break: preparing samples according to the type 1 sample strip in GB/T528-2009 and testing;
tear strength: and preparing samples according to a notched right-angle spline in GB/T529 and 2008 and testing.
The test results are shown in Table 1.
TABLE 1 results of Performance test of examples 1 to 4 and comparative examples 1 to 2
As can be seen from Table 1, the Shore hardness of the high-elongation high-strength precipitation glue disclosed by the embodiment of the invention is in a range of 49-53 degrees, the tensile strength reaches 8.8-9.1 MPa, the elongation reaches 720-760%, the tearing strength reaches 37.6-41.5 kN/m, the precipitation glue material is easy to roll, does not stick to a roller, does not fall off, is easy to color and mix, is easy to discharge, does not stick to a mold in the production process of the product, is easy to tear, has a smooth surface, and is suitable for producing medical negative pressure balls.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. A high-elongation high-strength precipitation gel material for producing medical negative pressure balls is characterized by comprising the following components in percentage by weight: 100-200 parts of methyl vinyl silicone rubber crude rubber, 20-60 parts of precipitated white carbon black, 3-10 parts of hydroxyl silicone oil, 0.5-1 part of hydrogen-containing silicone oil, 0.1-0.5 part of vinyl silicone oil, 1-3 parts of vulcanizing agent and 0.1-0.5 part of mold release agent; the raw methyl vinyl silicone rubber comprises raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content, and the weight ratio of the raw rubber to the raw rubber is 6-8: 92-94.
2. The high-elongation high-strength precipitated silica material for producing the medical negative pressure balloon as claimed in claim 1, wherein the specific surface area of the precipitated silica is 175 ± 15m 2/g.
3. The high-elongation high-strength precipitation gel material for producing medical negative pressure balls, according to claim 1, is characterized in that the hydroxyl silicone oil has a hydroxyl group molar fraction of 6%.
4. The high-elongation high-strength precipitation gel material for producing medical negative pressure balls, according to claim 1, is characterized in that the vinyl silicone oil vinyl content is 9.5%.
5. The high elongation and high strength precipitation gel material for producing medical negative pressure ball according to claim 1, wherein said vulcanizing agent is 2, 5-dimethyl-2, 5-di-tert-butylperoxyhexane.
6. The high-elongation high-strength precipitation glue material for producing medical negative pressure balls, according to claim 1, is characterized in that the release agent is zinc stearate.
7. The high-elongation high-strength precipitation gel material for producing the medical negative pressure ball as claimed in claim 1, wherein the vinyl molar fraction of the raw gel PS01 with the ultrahigh vinyl content is 3.0%, and the weight average relative molecular mass is 60 ten thousand; the vinyl mole fraction of the raw rubber PS02 with low vinyl content is 0.06%, and the weight average relative molecular mass is 62 ten thousand.
8. The high elongation and high strength precipitated gel material for producing a medical negative pressure balloon according to any one of claims 1 to 7, characterized in that the preparation method of the precipitated gel material comprises the following steps:
putting raw rubber PS01 with ultrahigh vinyl content and raw rubber PS02 with low vinyl content on an open mill, and mixing to a wrapping roller;
secondly, adding precipitated white carbon black, hydroxyl silicone oil, hydrogen-containing silicone oil and vinyl silicone oil into an open mill step by step, and repeatedly cutting to ensure that the rubber material is mixed uniformly without bubbles and burrs and then is formed into sheets;
thirdly, putting the uniformly mixed rubber material into a constant-temperature blowing oven at 190 ℃ for heat treatment for 3 hours;
cooling for 2h, putting the mixture into a rubber mixing mill for remilling, wrapping a roller, cutting left and right to enable the rubber material to be uniform, and discharging sheets after no burrs;
after the rubber material after being back-smelted is coated on a roller in an open mill, gradually adding a vulcanizing agent and a release agent in small amount, cutting left and right, performing triangular coating, uniformly mixing, and adjusting the roller spacing to obtain a lower sheet, wherein the thickness of the rubber material is 2.2-2.5 mm;
sixthly, quickly putting the rubber compound obtained in the fifth step into a preheated mould, and performing first-stage vulcanization on a flat vulcanizing machine; and then carrying out second-stage vulcanization in an electric heating blowing dry box to obtain the high-elongation high-strength precipitated gel material for producing the medical negative pressure ball.
9. The high elongation and high strength precipitation gel material for producing medical negative pressure ball according to claim 8, wherein said one-stage vulcanization is vulcanization at 10MPa and 175 ℃ for 20 min; the secondary vulcanization is carried out for 4 hours at the temperature of 200 ℃.
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Application publication date: 20210924 |