CN114479466A - High-resilience high-wear-resistance peristaltic pump tube and manufacturing method thereof - Google Patents
High-resilience high-wear-resistance peristaltic pump tube and manufacturing method thereof Download PDFInfo
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- CN114479466A CN114479466A CN202111551791.3A CN202111551791A CN114479466A CN 114479466 A CN114479466 A CN 114479466A CN 202111551791 A CN202111551791 A CN 202111551791A CN 114479466 A CN114479466 A CN 114479466A
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- 230000002572 peristaltic effect Effects 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 140
- -1 polysiloxane Polymers 0.000 claims abstract description 131
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 73
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 70
- 238000004073 vulcanization Methods 0.000 claims abstract description 55
- 229920001971 elastomer Polymers 0.000 claims abstract description 46
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000003054 catalyst Substances 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 238000001125 extrusion Methods 0.000 claims abstract description 24
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 17
- 239000000945 filler Substances 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 15
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 14
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 9
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 7
- 239000001257 hydrogen Substances 0.000 claims description 29
- 229910052739 hydrogen Inorganic materials 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 24
- 150000001875 compounds Chemical class 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 12
- 238000004898 kneading Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 abstract description 11
- 239000000741 silica gel Substances 0.000 abstract description 11
- 229910002027 silica gel Inorganic materials 0.000 abstract description 11
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 238000007792 addition Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000006459 hydrosilylation reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000002496 gastric effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
Abstract
The invention discloses a high-resilience high-wear-resistance peristaltic pump tube which comprises, by mass, 50-65% of polysiloxane, 15-25% of silica filler, 3-10% of methyl vinyl polysiloxane, 2-8% of methyl hydrogenpolysiloxane, 0.5-3.5% of platinum vulcanizing agent, 1.5-4.5% of dimethyl polysiloxane and 0.2-2% of platinum catalyst, wherein the content of vinyl in the methyl vinyl polysiloxane is 0.5-5%. The invention also discloses a preparation method of the high-resilience high-wear-resistance peristaltic pump tube. The addition of methyl vinyl polysiloxane enables the content of vinyl in the components to be higher, and can greatly improve the crosslinking density of vulcanized silica gel, thereby increasing the wear resistance, resilience and other mechanical properties of the silicone tube. The rubber tube is manufactured by adopting extrusion and vulcanization integrated forming equipment, so that the working procedures are reduced, the product yield is improved, and the cost is also saved. Before the pipe blank is vulcanized and formed, the pipe blank is heated by infrared rays, and the inner wall and the outer wall of the pipe blank are simultaneously heated by utilizing the penetrating power of the infrared rays, so that the product vulcanization is more uniform.
Description
Technical Field
The invention relates to the technical field of peristaltic pump tubes, in particular to a high-resilience high-wear-resistance peristaltic pump tube and a manufacturing method thereof.
Background
Most of silicone rubber tubes in the market are made by taking polysiloxane as a main silicon material, taking silicon dioxide as a filler, taking methyl hydrogen-containing polysiloxane as a cross-linking agent and taking a platinum catalyst as a catalyst for hydrosilylation, and mixing, extruding, calendaring, forming and vulcanizing the raw materials. The rubber tube is applied in different fields, the requirements on the performance of the rubber tube are different, in the medical field, if a liquid conveying tube requires certain transparency and chemical corrosion resistance, a hose for an automobile fuel oil pipeline needs certain liquid permeability resistance and the like.
The peristaltic pump tube is a flexible tube made of silica gel with different properties according to the power property and the different conveying materials of the peristaltic pump, and is generally most widely applied to the medical field, such as transfusion for patients, nutrient substance delivery for gastrointestinal patients or operation patients and the like through the peristaltic pump tube. When the peristaltic pump tube is used for delivering liquid medicine or nutrient solution to a patient, the peristaltic pump can apply pressure to the pump tube, and the liquid medicine in the tube is delivered by squeezing the pump tube. At present, peristaltic pump tubes most applied to the market are silicone tubes, most of the peristaltic pump tubes spontaneously researched in China have the defects of poor wear resistance, poor rebound resilience and the like, so that the service life of the peristaltic pump tubes is short, and imported products are still selected and used in places with high quality requirements on the pump tubes.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and the methyl vinyl polysiloxane with higher vinyl content is added in the prior formula, so that the crosslinking density of a vulcanized silica gel product is increased by increasing the vinyl content in the formula, and the wear resistance and the rebound resilience of the silica gel hose are improved. When the peristaltic pump pipe is manufactured, the pump pipe is extruded and vulcanized in the process, the infrared heating shaping mode is adopted, the inside and the outside of the pipe body are synchronously heated, the vulcanization of the pump pipe is more uniform when the pump pipe is vulcanized, and the wear resistance and the rebound resilience of the pump pipe are further improved.
In order to achieve the purpose, the technical scheme of the invention is to provide a high-resilience high-wear-resistance peristaltic pump tube which is characterized by comprising, by mass, 50-65% of polysiloxane, 15-25% of silica filler, 3-10% of methyl vinyl polysiloxane, 2-8% of methyl hydrogen polysiloxane, 0.5-3.5% of platinum vulcanizing agent, 1.5-4.5% of dimethyl polysiloxane and 0.2-2% of platinum catalyst, wherein the content of vinyl in the methyl vinyl polysiloxane is 0.5-5%.
The further preferable technical scheme is that the platinum catalyst is platinum water, and the concentration of the platinum water is 2000-50000 PPM.
The further preferable technical scheme is that the methyl hydrogen-containing polysiloxane is provided with hydrogen atoms directly bonded with silicon atoms, and the content of the hydrogen atoms directly bonded with silicon is 0.5-0.8%.
The invention also provides a preparation method of the high-resilience high-wear-resistance peristaltic pump tube, which is characterized by comprising the following steps of:
(1) kneading of methyl hydrogenpolysiloxane with platinum catalyst: firstly, methyl hydrogen-containing polysiloxane is put into a kneader, platinum water is added for three times, and the kneading is carried out for 30 minutes after all the platinum water is added;
(2) preparation of rubber compound: weighing polysiloxane, silicon dioxide filler, methyl vinyl polysiloxane, dimethyl polysiloxane, kneaded methyl hydrogen-containing polysiloxane and platinum catalyst, putting the obtained mixture into an internal mixer for mixing, adding a platinum vulcanizing agent after uniform mixing, and putting the mixture into an open mill for open mixing to obtain rubber compound;
(3) extrusion and vulcanization: and (3) putting the rubber compound obtained in the step (2) into a barrel of an extruder of extrusion vulcanization equipment to prepare a tube blank, and conveying the tube blank to a vulcanization section for vulcanization after infrared heating and shaping under the traction of a traction device to obtain the molded rubber tube.
In a further preferred technical scheme, in the kneading step of the methyl hydrogen polysiloxane and the platinum catalyst, the time interval of adding the platinum water is 15 min.
The further preferable technical scheme is that the traction speed of a traction device in the extrusion vulcanization equipment is 1-6 m/min.
The further preferable technical scheme is that the infrared setting temperature is 450-600 ℃.
The further preferable technical scheme is that the vulcanization temperature is 200-300 ℃.
In the prior art, when a peristaltic pump hose is manufactured, polysiloxane is generally used as a main raw material, and auxiliary agents such as silicon dioxide filler and methyl hydrogen polysiloxane are used for assistance, and in order to further improve the performance of the hose in all aspects, some researchers add other auxiliary agents into the hose so as to improve the heat resistance, chemical resistance, mechanical performance and other capabilities of the hose. The technical scheme of the invention mainly aims at improving the wear resistance and resilience of the peristaltic pump tube, and mainly improves from two aspects, on one hand, methyl vinyl polysiloxane with higher vinyl content is added in the formula by adjusting the formula, a platinum vulcanizing agent is adopted as a cross-linking agent of the reaction, and platinum water is adopted as a catalyst of the reaction, so that all components in the formula are subjected to cross-linking reaction and vulcanized to form the silicone tube. Because the content of effective platinum in the commercially available platinum catalyst is unknown and the components of the carrier are unknown, the amount of the catalyst can be adjusted only when the catalyst is used, other ineffective or impurity components in the platinum catalyst can be introduced, and the local vulcanization effect of the sizing material can be influenced microscopically. The platinum catalyst used in the invention is self-prepared platinum water, and the effective platinum content can be controlled. When methyl hydrogen polysiloxane and platinum are kneaded in water, other ineffective components can not be introduced, which is beneficial to ensuring the purity of the raw materials and improving the local vulcanization effect.
The addition of methyl vinyl polysiloxane increases the vinyl content of the hose components, and can improve the crosslinking density of the polysiloxane when the hose is vulcanized. The content of vinyl in the methyl vinyl polysiloxane is 0.5-10%, and when the content of vinyl in the added methyl vinyl polysiloxane is higher, a network structure of concentrated crosslinking at one position can be generated in the vulcanized rubber, namely a plurality of vinyl molecules form a plurality of concentrated crosslinking points. When the material is subjected to external force, stress is uniformly dispersed on a plurality of molecular chains through the concentrated crosslinking points, so that the capability of the material for resisting the external force is enhanced, and the wear resistance, the rebound resilience and other mechanical properties of the material are improved. The technical scheme of the invention adopts a platinum vulcanizing agent as a vulcanizing agent, so that the methyl hydrogen-containing polysiloxane and vinyl double bonds are subjected to hydrosilylation reaction, thereby achieving the purpose of crosslinking vulcanization. The platinum vulcanizing agent is a two-component addition type vulcanizing agent, has the characteristics of no blooming, low vulcanizing temperature, high vulcanizing speed and the like, and has the advantages of environmental protection, high efficiency and no smell compared with the traditional peroxide vulcanizing system.
The silicone tube is generally manufactured by accurately weighing the raw materials, then placing the raw materials into an internal mixer for internal mixing, adding a vulcanizing agent and other auxiliary agents for open mixing, then placing the mixed rubber into an extruder for extrusion, pressing a rubber sheet through a calender, and finally placing the rubber sheet into a mold for vulcanization molding. The silicone tube manufacturing process in the prior art is complex, the flow is complicated, and the yield is low. The technical scheme of the invention is that the raw materials are weighed and mixed uniformly, then the vulcanizing agent is added and put into an open mill for open milling, and finally the rubber tube is manufactured by adopting extrusion and vulcanization integrated forming equipment, so that the working procedures are reduced, the product yield is improved, and the cost is saved.
The other bright point in the technical scheme of the invention is that the pipe blank is heated by infrared rays before being vulcanized and formed, and the inner wall and the outer wall of the pipe blank are simultaneously heated by utilizing the penetrating power of the infrared rays, so that the vulcanization of a product is more uniform. The infrared heating shaping not only enables the rubber tube to be heated uniformly, but also has higher heating rate and high production efficiency, and the addition of the platinum vulcanizing agent and the methyl vinyl polysiloxane enables the product to obtain higher crosslinking density only by once vulcanization, and the product has better rebound resilience and mechanical property.
The invention has the advantages and beneficial effects that:
1. the addition of methyl vinyl polysiloxane enables the content of vinyl in the components to be higher, and can greatly improve the crosslinking density of vulcanized silica gel, thereby increasing the wear resistance, resilience and other mechanical properties of the silicone tube.
2. The method uses a platinum vulcanizing agent as a vulcanizing agent, prepares platinum water with the concentration of 2000-50000PPM as a catalyst, and kneads the platinum water with methyl hydrogenpolysiloxane to ensure that the methyl hydrogenpolysiloxane and vinyl double bonds generate hydrosilylation reaction, thereby achieving the purpose of crosslinking and vulcanizing.
3. Before the pipe blank is vulcanized and formed, the pipe blank is heated by infrared rays, and the inner wall and the outer wall of the pipe blank are simultaneously heated by utilizing the penetrating power of the infrared rays, so that the product vulcanization is more uniform. The introduction of infrared heating can make the rubber product heated comparatively evenly when vulcanizing, and simultaneously can reduce the vulcanization time and improve the production efficiency.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The peristaltic pump tube with high resilience and high wear resistance comprises, by mass, 50% of polysiloxane, 25% of silica filler, 10% of methyl vinyl polysiloxane, 8% of methyl hydrogen polysiloxane, 3.5% of platinum vulcanizing agent, 1.5% of dimethyl polysiloxane and 2% of platinum catalyst. Wherein, the content of vinyl in methyl vinyl polysiloxane is 0.5%, the methyl hydrogen polysiloxane has hydrogen atoms directly bonded with silicon atoms, the content of the hydrogen atoms directly bonded with silicon is 0.5%, and the platinum catalyst is platinum water with the concentration of 2000 PPM.
A preparation method of a high-resilience high-wear-resistance peristaltic pump tube comprises the following steps:
(1) preparation of rubber compound: weighing polysiloxane, silicon dioxide filler, methyl vinyl polysiloxane, methyl hydrogen polysiloxane, dimethyl polysiloxane and catalyst, putting the mixture into an internal mixer for mixing, adding a platinum vulcanizing agent after mixing uniformly, and putting the mixture into an open mill for open mixing to obtain rubber compound;
(2) putting the rubber compound into a charging barrel of an extrusion molding machine, and performing extrusion molding by the extruder to form a silica gel tube blank;
(3) and (3) putting the silica gel tube blank into a vulcanization forming box, and vulcanizing and forming the silica gel tube blank in two sections, wherein the first section vulcanization temperature is 160 ℃, the vulcanization time is 25min, the second section vulcanization temperature is 180 ℃, and the vulcanization time is 60 min.
Example 2
Example 2 differs from example 1 in that a high resilience and high wear resistance peristaltic pump tube comprises, by mass, 65% of polysiloxane, 15% of silica filler, 9% of methyl vinyl polysiloxane, 2% of methyl hydrogen polysiloxane, 3.5% of platinum vulcanizing agent, 4.5% of dimethyl polysiloxane and 1% of platinum catalyst. Wherein, the content of vinyl in methyl vinyl polysiloxane is 5%, the methyl hydrogen polysiloxane has hydrogen atoms directly bonded with silicon atoms, the content of the hydrogen atoms directly bonded with silicon is 0.8%, and the platinum catalyst is 30000PPM platinum water.
Example 3
Example 3 differs from example 1 in that a method for preparing a high-resilience high-wear-resistance peristaltic pump tube comprises the following steps:
(1) kneading of methyl hydrogenpolysiloxane with platinum catalyst: firstly, 8% methyl hydrogen polysiloxane is put into a kneader, platinum water is added for three times, the interval time of each addition is 15 minutes, and the kneading is carried out for 30 minutes after all the additions are finished;
(2) preparation of rubber compound: weighing polysiloxane, silicon dioxide filler, methyl vinyl polysiloxane, dimethyl polysiloxane, kneaded methyl hydrogen-containing polysiloxane and platinum catalyst, putting the obtained mixture into an internal mixer for mixing, adding a platinum vulcanizing agent after uniform mixing, and putting the mixture into an open mill for open mixing to obtain rubber compound;
(3) extrusion and vulcanization: putting the rubber compound obtained in the step (2) into a charging barrel of an extruder of extrusion vulcanization equipment to prepare a tube blank, carrying out infrared heating and shaping on the tube blank under the traction of a traction device, and then conveying the tube blank to a vulcanization section for vulcanization to obtain a molded rubber tube, wherein the traction speed of the traction device in the extrusion vulcanization equipment is 1m/min, the infrared shaping temperature is 450 ℃, and the vulcanization temperature is 300 ℃.
Example 4
Example 4 is different from example 3 in that in the extrusion vulcanization molding process of the rubber compound, the traction speed of a traction device in an extrusion vulcanization device is 6m/min, the infrared setting temperature is 600 ℃, and the vulcanization temperature is 200 DEG C
Example 5
The peristaltic pump tube with high resilience and high wear resistance comprises, by mass, 62% of polysiloxane, 24% of silica filler, 3% of methyl vinyl polysiloxane, 7.8% of methyl hydrogen polysiloxane, 0.5% of platinum vulcanizing agent, 2.5% of dimethyl polysiloxane and 0.2% of catalyst. Wherein, the content of vinyl in methyl vinyl polysiloxane is 2%, the methyl hydrogen polysiloxane has hydrogen atoms directly bonded with silicon atoms, the content of the hydrogen atoms directly bonded with silicon is 0.8%, and the platinum catalyst is platinum water with the concentration of 50000 PPM.
A preparation method of a high-resilience high-wear-resistance peristaltic pump tube comprises the following steps:
(1) kneading of methyl hydrogenpolysiloxane with platinum catalyst: firstly, 7.8 percent of methyl hydrogen polysiloxane is put into a kneader, platinum water is added into the kneader by three times, the interval time of each addition is 15 minutes, and the kneading is carried out for 30 minutes after all additions are finished;
(2) preparation of rubber compound: weighing polysiloxane, silicon dioxide filler, methyl vinyl polysiloxane, dimethyl polysiloxane, kneaded methyl hydrogen-containing polysiloxane and platinum catalyst, putting the obtained mixture into an internal mixer for mixing, adding a platinum vulcanizing agent after uniform mixing, and putting the mixture into an open mill for open mixing to obtain rubber compound;
(3) extrusion and vulcanization: putting the rubber compound obtained in the step (2) into a barrel of an extruder of extrusion vulcanization equipment to prepare a tube blank, carrying out infrared heating and shaping on the tube blank under the traction of a traction device, and then conveying the tube blank to a vulcanization section for vulcanization to obtain a molded rubber tube, wherein the traction speed of the traction device in the extrusion vulcanization equipment is 3m/min, the infrared shaping temperature is 500 ℃, and the vulcanization temperature is 230 ℃.
Comparative example 1
The peristaltic pump tube with high resilience and high wear resistance comprises, by mass, 67% of polysiloxane, 23% of silica filler, 5% of methyl hydrogen-containing polysiloxane, 1% of platinum vulcanizing agent, 2.5% of dimethyl polysiloxane and 1.5% of catalyst. The methyl hydrogen-containing polysiloxane has hydrogen atoms directly bonded with silicon atoms, the content of the hydrogen atoms directly bonded with silicon is 0.8%, and the catalyst is a platinum catalyst.
A preparation method of a high-resilience high-wear-resistance peristaltic pump tube comprises the following steps:
(1) preparation of rubber compound: weighing polysiloxane, silicon dioxide filler, methyl vinyl polysiloxane, methyl hydrogen polysiloxane, dimethyl polysiloxane and catalyst, putting the mixture into an internal mixer for mixing, adding a platinum vulcanizing agent after mixing uniformly, and putting the mixture into an open mill for open mixing to obtain rubber compound;
(2) putting the rubber compound into a charging barrel of an extrusion molding machine, and performing extrusion molding by the extruder to form a silica gel tube blank;
(3) and (3) putting the silica gel tube blank into a vulcanization forming box, and vulcanizing and forming the silica gel tube blank in two sections, wherein the first section vulcanization temperature is 160 ℃, the vulcanization time is 25min, the second section vulcanization temperature is 180 ℃, and the vulcanization time is 60 min.
Comparative example 2
The difference between the comparative example 2 and the comparative example 1 is that the preparation method of the high-resilience high-wear-resistance peristaltic pump tube comprises the following steps:
(1) kneading of methyl hydrogenpolysiloxane with platinum catalyst: firstly, 5 percent of methyl hydrogen polysiloxane is put into a kneader, platinum water is added for three times, the interval time of each addition is 15 minutes, and the kneading is carried out for 30 minutes after all the additions are finished;
(2) preparation of rubber compound: weighing polysiloxane, silicon dioxide filler, methyl vinyl polysiloxane, dimethyl polysiloxane, kneaded methyl hydrogen-containing polysiloxane and platinum catalyst, putting the obtained mixture into an internal mixer for mixing, adding a platinum vulcanizing agent after uniform mixing, and putting the mixture into an open mill for open mixing to obtain rubber compound;
(3) extrusion and vulcanization: putting the rubber compound obtained in the step (2) into a barrel of an extruder of extrusion vulcanization equipment to prepare a tube blank, carrying out infrared heating and shaping on the tube blank under the traction of a traction device, and then conveying the tube blank to a vulcanization section for vulcanization to obtain a molded rubber tube, wherein the traction speed of the traction device in the extrusion vulcanization equipment is 3m/min, the infrared shaping temperature is 500 ℃, and the vulcanization temperature is 230 ℃.
The rubber tube samples of the examples 1-5 and the comparative examples 1-2 are taken, and the rubber tube samples are respectively subjected to breaking elongation, tensile strength and tensile deformation rate (rebound resilience) tests according to the standard YY 0031-. Selecting three rubber tube samples of examples 1-5 and comparative examples 1-2 respectively, installing the rubber tube samples on a peristaltic pump for wear resistance test, wherein the rotating speed of the peristaltic pump is 600r/min during the test, stopping the test until the rubber tube breaks and leaks, recording the test time of each rubber tube, and the wear resistance time of each example is the average value of the three samples. The results of the experiments are given in the following table.
Examples elongation at break/% tensile strength/MPa tensile set/% abrasion resistance time/h
Example 15607.62.147
Example 26007.24.427
Example 36308.71.5120
Example 45708.61.796
Example 56009.01.3127
Comparative example 17806.365
Comparative example 26707.0513
The results in the table show that by adding methyl vinyl polysiloxane in the formula and adopting self-prepared platinum water as a catalyst, the elongation at break of the manufactured rubber hose is reduced, but the rebound resilience and the wear resistance of the rubber hose are greatly improved, and the wear resistance time of the rubber hose manufactured by adopting the manufacturing method can reach 3-20 times of that of the rubber hose manufactured by adopting the traditional method.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The high-resilience high-wear-resistance peristaltic pump tube is characterized by comprising, by mass, 50-65% of polysiloxane, 15-25% of silica filler, 3-10% of methyl vinyl polysiloxane, 2-8% of methyl hydrogenpolysiloxane, 0.5-3.5% of platinum vulcanizing agent, 1.5-4.5% of dimethyl polysiloxane and 0.2-2% of platinum catalyst, wherein the content of vinyl in the methyl vinyl polysiloxane is 0.5-5%.
2. The peristaltic pump tube of claim 1, wherein the platinum catalyst is platinum water, and the concentration of the platinum water is 2000-50000 PPM.
3. A peristaltic pump tube as claimed in claim 1, wherein the methyl hydrogen-containing polysiloxane has hydrogen atoms directly bonded to silicon atoms, and the content of the hydrogen atoms directly bonded to silicon is 0.5 to 0.8%.
4. A method for preparing a peristaltic pump tube according to any one of claims 1 to 3, comprising the steps of:
(1) kneading of methyl hydrogenpolysiloxane with platinum catalyst: firstly, methyl hydrogen-containing polysiloxane is put into a kneader, platinum water is added for three times, and the kneading is carried out for 30 minutes after all the platinum water is added;
(2) preparation of rubber compound: weighing polysiloxane, silicon dioxide filler, methyl vinyl polysiloxane, dimethyl polysiloxane, kneaded methyl hydrogen-containing polysiloxane and platinum catalyst, putting the obtained mixture into an internal mixer for mixing, adding a platinum vulcanizing agent after uniform mixing, and putting the mixture into an open mill for open mixing to obtain rubber compound;
(3) extrusion and vulcanization: and (3) putting the rubber compound obtained in the step (2) into a charging barrel of an extruder of extrusion vulcanization equipment to obtain a tube blank, and conveying the tube blank to a vulcanization section for vulcanization after infrared heating and shaping under the traction of a traction device to obtain a molded rubber tube.
5. The production method according to claim 4, wherein in the kneading step of the methyl hydrogen polysiloxane and the platinum catalyst, the interval time for adding the platinum water is 15 min.
6. The production method according to claim 4, wherein a pulling speed of a pulling device in the extrusion vulcanization apparatus is 1 to 6 m/min.
7. The preparation method according to claim 5, wherein the infrared setting temperature is 450-600 ℃.
8. The method according to claim 5, wherein the vulcanization temperature is 200 to 300 ℃.
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