CN106543721B - Silica gel strip and preparation method and application thereof - Google Patents
Silica gel strip and preparation method and application thereof Download PDFInfo
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- CN106543721B CN106543721B CN201510593551.8A CN201510593551A CN106543721B CN 106543721 B CN106543721 B CN 106543721B CN 201510593551 A CN201510593551 A CN 201510593551A CN 106543721 B CN106543721 B CN 106543721B
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Abstract
The invention provides a silica gel strip which is prepared from 85-90% of silica gel and 10-15% of lubricating material in percentage by mass. Wherein the lubricating material is graphite powder or resin powder. The silica gel strip provided by the invention can be used for automobile wipers or common glass wipers. The silica gel strip can achieve the effect of quickly cleaning glass without coating, has no jumping, shaking and noise problems, and has the advantages of cold resistance, heat resistance, ultraviolet resistance, ozone resistance, abrasion resistance and long service life.
Description
Technical Field
The invention relates to the field of cleaning, in particular to the field of glass cleaning, and more particularly to improving a silica gel strip in a scraper.
Background
A wiper, also called a wiper, a dryer, a wiper or a windshield wiper, is a device for wiping off rain, snow and dust attached to a windshield of a vehicle, so as to improve visibility of a driver and increase driving safety. Because of legal requirements, almost all motor vehicles come with wipers. The rear windows of vehicles such as hatchbacks and recreational vehicles are also equipped with wipers. In addition to automobiles, other transportation means are provided with wipers such as trains, trams, and the like. Some engineering tools, such as cranes, etc. are also provided with wipers. The service life of the wiper blade is mainly determined by the wiper strip, and generally, most wiper strips are made of rubber.
In the existing windscreen wiper, when the wiper strip is in contact with glass, the wiper strip bears the force given by the wiper blade to deform, so that the wiper strip is tightly close to the surface of the glass, but the wiper strip is in contact with the glass and is made of a material of a coating on the surface of the wiper strip, so that the aim of wiping is fulfilled, and although the wiper strip can be more smooth due to the coating, the problems of tail swing, shaking and noise can be caused. Meanwhile, the rubber wiper strip is accelerated to age under the complex conditions of the external environment, such as sunshine, ultraviolet rays, temperature change, acidic substances in the air and the like, so that the service life of the wiper strip is further influenced.
Silicone rubber (silica gel for short) refers to rubber in which the main chain is composed of alternating silicon and oxygen atoms, and two organic groups are usually bonded to the silicon atoms. Conventional silicone rubbers consist predominantly of siloxane segments containing methyl groups and small amounts of vinyl groups. The introduction of phenyl can improve the high and low temperature resistance of the silicone rubber, and the introduction of trifluoropropyl and cyano can improve the temperature resistance and oil resistance of the silicone rubber. The silicon rubber has good low-temperature resistance and can still work at the temperature of minus 55 ℃. After the introduction of phenyl, a temperature of-73 ℃ can be reached. The silicon rubber has outstanding heat resistance, can work for a long time at 180 ℃, can still have elasticity for a plurality of weeks or more even at the temperature slightly higher than 200 ℃, and can instantaneously resist the high temperature of more than 300 ℃. Silicone rubber has good gas permeability, and oxygen transmission rate is the highest among synthetic polymers. Therefore, there are companies who push out silicone wipers made of silicone rubber materials as wiper blades.
After the silicon rubber is cured and formed, the surface roughness is very high, and the silicon rubber is silicon dioxide which is the same as the main component material of glass, and the compatibility of the material is high (high friction coefficient); therefore, after the two materials are pressed by external force and tightly attached, great friction force can be generated between the two materials, so that the scraping action is unstable; in the actual phenomenon, the phenomenon of jumping of the windshield wiper when the windshield wiper scrapes the glass can be observed, which causes the problem of incomplete scraping.
The problem is solved by coating a silver-containing coating on a silica gel scraper, and forming a silver oxide layer as a lubricant between the silver oxide layer and glass by utilizing the rapid oxidation capability of the silver surface in contact with air, so as to reduce the friction force. However, the method not only adds an additional process on the production process, but also directly replaces the rubber material with the silicon rubber material, thereby enhancing the durability of the silicon rubber material and losing significance; because of this, the durability of the silicone wiper strip will depend on the durability of the silver-containing coating, rather than the durability of the silicone material, which does not take advantage of the advantages of conventional rubber wiper strips.
Disclosure of Invention
In order to solve the above problems, the present invention provides a silica gel strip, which can achieve a good wiping effect without spraying a coating layer, and can form a waterproof layer on glass during wiping.
In order to achieve the purpose, the invention provides a silica gel strip which comprises 85-90% of silica gel and 10-15% of lubricating material in percentage by mass.
Preferably, the lubricating material is graphite powder or resin powder.
Preferably, the resin powder is melamine resin powder.
The invention also provides a preparation method of the silica gel strip, which comprises the following steps:
1) preparing raw materials: adding 10-15% of lubricating material into the raw material silicon rubber compound;
2) rubber mixing: feeding the materials in the step 1) into an internal mixer for mixing, internally mixing and discharging;
3) cutting;
4) hot-press forming;
5) vulcanizing;
6) checking;
7) removing edges;
8) post-treatment;
9) checking;
10) and (6) packaging.
Preferably, the rubber mixing temperature in the step 2) is 40-50 ℃, and the rubber mixing time is 30 minutes.
Preferably, the hot-press molding in the step 4) is performed in a hot press, wherein the upper mold temperature is 195 ℃, the lower mold temperature is 190 ℃, and the molding time is 430 seconds.
The above processes are the same as the prior art except for the specially marked process conditions.
The invention also provides the application of the silica gel strip in glass scraping.
Preferably, the cleaning agent is arranged on a wiper of an automobile to clean automobile glass or arranged on a glass cleaning scraper to clean household or architectural glass.
The silica gel strip provided by the invention is prepared by mixing the raw materials of the silicone rubber and using the lubricating material which is easy to break, and when the silica gel strip is rubbed with glass, the self-lubricating property of a contact surface is increased due to continuous slight breakage, and the friction force between the silicon rubber and the glass is reduced.
The existing silica gel strip has the following process flow: raw material preparation → rubber mixing → material cutting → hot press molding → vulcanization → inspection → edge dismantling → spray coating → post treatment → inspection → packaging.
Compared with the existing process, the process provided by the invention reduces the steps of spraying the film and reduces the cost. The external dimension of the finished product of the manufactured windshield wiper completely conforms to the specification of the common silica gel windshield wiper sold in the market at present.
The invention has the beneficial effects that: the invention provides a silica gel strip and a preparation method thereof, the silica gel strip is added with a lubricating material, when the silica gel strip is rubbed with glass, the self-lubricating property of a contact surface is increased due to continuous slight fracture, and the friction force between the silica gel strip and the glass is reduced; the glass surface after scraping does not have the attachment, has reduced adhesive force, can fully represent the cohesion of water, just as the lotus leaf surface, and the raindrop can assemble into the raindrop on the glass surface, when being used in wiper on the car, can make the person of driving also can keep the vision clear at night, has improved the security of driving a vehicle even bumping into rainy day. When the cleaning agent is used for cleaning other glass or planes, the scraped glass or planes are not easy to be stained with water, and the cleaning agent is easy to clean. According to the preparation method of the silica gel strip, the step of spraying and coating the film is reduced, and the production cost is reduced. Meanwhile, the coating is not sprayed, so that the service life of the wiper strip is not limited to the durability of the coating, but the high durability of the silicon rubber is reflected.
In terms of performance, the main component material of the silicon rubber in the silica gel strip is silicon dioxide, and the silica gel strip has the advantages of cold resistance, heat resistance, ultraviolet resistance, ozone resistance, abrasion resistance and long service life. The hand can not be blackened when being held in the hand, and the hand does not feel greasy and sticky. In the aspect of environmental protection, the silica gel strip has no environmental protection problem, can be completely recycled, and cannot cause environmental pollution even if discarded, or an incinerator is incinerated without toxic gas and can not damage the incinerator structure.
Drawings
FIG. 1 is a schematic view of a test device for testing the maximum static friction tension of a silica gel strip and common glass.
Fig. 2 is a schematic view of the function of the wiper under test of the present invention.
Drawings
1: a tensile test bed; 2: a tension controller; 3: a tension detector; 4: weighing; 5: testing a sample; 6: common glass; 7: marking a segment; 8: a window glass; 9: testing a sample; a: a first test segment; b: a second test section; c: and a third testing section.
Detailed Description
The silicon rubber raw material used in the invention is purchased from silica gel company of Taiwan of China, and the height is 100 percent. The rubber strips and the silver-containing coating silica gel strips for testing are all commercially available products.
The melamine-formaldehyde resin (melamine-formaldehyde resin) used in the invention is a polymer obtained by the reaction of melamine and formaldehyde, is commercially available, and has the following specifications: the content of 90 percent of the formaldehyde solution passing through an 80-mesh sieve is more than or equal to 99, the water content and volatile substances are less than or equal to 4, the bonding strength is more than or equal to 1.7mpa, the precipitation amount of free formaldehyde is less than or equal to 30mg/l, the pH value is 7-8, and the water-insoluble substance is less than or equal to 0.5.
The graphite used in the invention is graphite powder which is commercially available, and has the specifications of fixed carbon content of more than 99%, ash content of less than 0.7%, moisture content of less than 0.5% and effective particle size of more than 90%.
It should be noted that: the invention discloses a silicon rubber strip forming method, which is characterized in that silicon rubber is in a semi-finished rubber compound form before forming, tests are carried out by adopting various types of rubber compounds, the types of the raw materials of the rubber compounds do not influence the lubricating property of the silicon rubber strip, the added lubricating material plays an important role, and one type of rubber compound HCE GF171 is selected as the silicon rubber raw material to verify the effect of the silicon rubber strip in order to ensure the consistency of the test effect.
The invention mainly adopts the scheme that a finished product of the windshield wiper is prepared by a newly configured raw material formula according to the process flow, the external dimension of the finished product completely conforms to the specification of the common silica gel windshield wiper sold in the market at present, and then the functions of the windshield wiper are mutually compared.
Example 1
Melamine resin powder with the mass percent of 10% is added into the mixed rubber HCE GF171 to prepare a silica gel strip, and the preparation process is as follows:
1) preparing raw materials: 10% of melamine resin powder is added into the mixed rubber HCE GF 171;
2) rubber mixing: feeding the materials in the step 1) into an internal mixer for mixing, internally mixing and discharging, wherein the mixing temperature is 45 ℃, and the mixing time is 30 minutes;
3) cutting;
4) hot-press molding: hot-press molding in a hot press, wherein the temperature of an upper mold is 195 ℃, the temperature of a lower mold is 190 ℃, and the molding time is 430 seconds;
5) vulcanizing;
6) checking;
7) removing edges;
8) post-treatment;
9) checking;
10) and (6) packaging.
Example 2
Melamine resin powder with the mass percent of 12% is added into the mixed rubber HCE GF171 to prepare a silica gel strip, and the preparation method is the same as that of the example 1, and only the mass percent of the melamine resin in the silica gel strip needs to be adjusted.
Example 3
15 percent by mass of melamine resin powder is added into the mixed rubber HCE GF171 to prepare a silica gel strip, and the preparation method is the same as that of the example 1, and only the mass percent of the melamine resin is required to be adjusted.
Example 4
Adding 5%, 10%, 12%, 15% and 20% graphite powder by mass percent into the rubber compound HCE GF171 respectively to prepare silica gel strips containing 5%, 10%, 12%, 15% and 20% graphite components, wherein the preparation method is the same as the example 1, and only the melamine resin powder in the step 1) is changed into the graphite powder with corresponding content.
The silica gel strips not prepared in the preceding examples, but used in the following experiments, were also prepared by the method of example 1.
Example 5
The test method is shown in fig. 1: fixing ordinary glass 6 on a tension test bed, cutting the rubber strips, the silica gel strips containing silver and the mixed rubber HCE GF171 into silica gel strips with the length of 20mm respectively to be used as test samples 5, mutually laminating the test samples 5 and the ordinary glass 6, placing 12g of iron blocks on the test samples 5 as a weight 4 to apply pressure to the test samples 5 and the ordinary glass 6, connecting the test samples 5 with a tension controller 2, applying tension to a tension detector 3, and recording the maximum tension when the maximum static friction is converted into dynamic friction, wherein the tension detector 3 is a tension meter. The results are shown in Table 1.
The rubber strips and the silica gel strips with the silver-containing coatings are commercially available, and the silica gel strips are prepared according to the method of the embodiment 1 without adding a lubricating material.
Table 1: record of static friction maximum tensile test of rubber, silver-containing silica gel strip, silica gel strip and common glass
| Order of item | Sample number | Name (R) | Specification of material | Maximum pulling force (N) |
| a-1 | 1308121 | Rubber strip | 0.025 | |
| a-2 | 1308122 | Silica gel strip with silver-containing coating | 0.013 | |
| a-3 | 1308123 | Silica gel strip | HCE GF171 of rubber compound | 0.546 |
From the test results in the table above, it can be seen that the static friction force of the silica gel strip without the added lubricating material is converted into the maximum required tension force in the dynamic friction, and the result is used as a reference standard for developing new material experiments.
Example 6
The test sample 5 in the test method shown in fig. 1 in example 5 was replaced with a silica gel strip prepared by mixing 20% graphite powder with HCE GF171 as a rubber compound, and the preparation method of the silica gel strip was shown in example 1, in which the particle sizes of the graphite powders in each group were different to determine the influence of the particle size of the graphite powder on the friction loss. The results are shown in Table 2.
Table 2: record of static friction maximum tensile test of silica gel strip and common glass
| Order of item | Sample number | Name (R) | Specification of material | Controlling conditions | Maximum pulling force (N) |
| b-1 | 1308021 | Silicon rubber strip containing graphite | The proportion of the graphite is 20 percent | Graphite powder particle size of 1.5u | 0.027 |
| b-2 | 1308022 | Silicon rubber strip containing graphite | The proportion of the graphite is 20 percent | Graphite powder particle size of 2.5u | 0.056 |
| b-3 | 1308023 | Silicon rubber strip containing graphite | The proportion of the graphite is 20 percent | Graphite powder particle size of 4.0u | 0.062 |
| b-4 | 1308024 | Silicon rubber strip containing graphite | The proportion of the graphite is 20 percent | Graphite powder particle size of 10u | 0.134 |
| b-5 | 1308025 | Silicon rubber strip containing graphite | The proportion of the graphite is 20 percent | Graphite powder particle size of 15u | 0.141 |
From the above table test results it can be seen that: the graphite powder can reduce the friction force between silica gel and glass, and the smaller the particle size of the graphite powder is, the smaller the friction force between the graphite powder and the glass is.
Example 7
The test sample 5 in the test method shown in fig. 1 in example 5 was replaced with a silica gel strip made of a mixed rubber HCE GF171 mixed with graphite powder having a particle size of 1.5u, and the silica gel strip was prepared as shown in example 1, in which the content of graphite powder was different for each group, to determine the influence of the content of graphite powder on the friction loss. The results are shown in Table 3.
Table 3: record of static friction maximum tensile test of silica gel strip and common glass
| Order of item | Sample number | Name (R) | Specification of material | Controlling conditions | Maximum pulling force (N) |
| c-1 | 1308131 | Silicon rubber strip containing graphite | Graphite powder particle size of 1.5u | The proportion of the graphite is 5 percent | 0.652 |
| c-2 | 1308132 | Silicon rubber strip containing graphite | Graphite powder particle size of 1.5u | The proportion of the graphite is 10 percent | 0.055 |
| c-3 | 1308161 | Silicon rubber strip containing graphite | Graphite powder particle size of 1.5u | The proportion of the graphite is 15 percent | 0.023 |
| c-4 | 1308251 | Silicon rubber strip containing graphite | Graphite powder particle size of 1.5u | The proportion of the graphite is 12 percent | 0.034 |
The test results show that the friction loss can be effectively reduced when the graphite powder content of the silica gel strip is 10-15%. Repeated tests show that the proportion of the graphite powder is continuously increased, the wear resistance of the silica gel strip is reduced, and the service life of the silica gel strip is shortened. When the proportion of the graphite powder is kept at 10-15%, the friction loss and the wear resistance are reduced, and the service life is kept to the best comprehensive effect.
Example 8
The test sample 5 of example 5, which was the test method shown in FIG. 1, was replaced with a silica gel strip made of a mixture of melamine resin powders having a particle size of 110u as HCE GF171 of the rubber mix, and the silica gel strip was prepared as shown in example 1, in which the melamine resin powder content was varied for each group to determine the effect of the melamine resin powder content on the friction loss. The results are shown in Table 3.
Table 4: record of static friction maximum tensile test of silica gel strip and common glass
| Order of item | Sample number | Name (R) | Specification of material | Controlling conditions | Maximum pulling force (N) |
| d-1 | 1309151 | Resin-containing silica gel strip | Melamine resin particle size 110u | The proportion of the melamine-containing resin is 5 percent | 0.072 |
| d-2 | 1309161 | Resin-containing silica gel strip | Melamine resin particle size 110u | The proportion of the melamine resin is 20 percent | 0.012 |
| d-3 | 1310201 | Resin-containing silica gel strip | Melamine resin particle size 110u | The proportion of the melamine-containing resin is 15 percent | 0.015 |
| d-4 | 1310251 | Resin-containing silica gel strip | Melamine resin particle size 110u | The proportion of the melamine resin is 10 percent | 0.015 |
| d-5 | 1312111 | Resin-containing silica gel strip | Melamine resin particle size 110u | The proportion of the melamine resin is 12 percent | 0.012 |
From the test results, the proportion of the melamine resin in the silica gel strip is 10-15%, so that the friction loss can be effectively reduced. Repeated tests show that the friction loss can be reduced by continuously increasing the proportion of the melamine resin, but the wear resistance of the silica gel strip is reduced, and the service life of the silica gel strip is shortened. When the proportion of the melamine resin is kept between 10 and 15 percent, the melamine resin can reduce the friction loss and the wear resistance, and the service life can keep the best comprehensive effect.
Example 9
And cutting the silica gel strips and the silica gel strips containing the lubricating material according to the specifications of commercial windshield wipers, and then installing the silica gel strips, the finished rubber strips and the silica gel strips containing the silver coatings on the windshield wiper device for testing the scraping effect.
As shown in fig. 2: the windshield wiper rubber strip of the tested object, namely the test sample 9 is arranged on the windshield wiper device for the vehicle, the water solution containing blue pigment is sprayed on the window glass 8 to be tested, the function of the windshield wiper for the vehicle is started, the windshield wiper scrapes the window glass 8, and the number of jumps generated when the test sample 9 scrapes the window glass 8 in the three test sections A, B, C in the range of the marking section 7 on the window glass 8 is recorded. The results are shown in Table 2.
Table 5: functional test record of rubber windscreen wiper, silver-containing silica gel strip windscreen wiper, graphite-containing silica gel strip windscreen wiper, resin-containing silica gel strip windscreen wiper and automobile glass windscreen wiper
And (3) testing results: the silica gel windscreen wiper with the new material and the silica gel windscreen wiper with the silver coating have no scratch on the glass surface after scraping water glass, but the silica gel windscreen wiper with the silver coating can generate higher jumping number. And rubber windscreen wiper and no coating silica gel strip windscreen wiper not only can produce the jump, can produce the scratch moreover on glass, harm glass, influence the driving sight, be unfavorable for driving safety.
From the test results, the silicon rubber strip wiper containing the lubricating material with proper content greatly reduces the jumping and shaking phenomena in the wiping process, and simultaneously avoids the noise problem caused by jumping and shaking.
In addition, because the silica gel strip windscreen wiper of new material forms the super hydrophobic structure of one deck on the glass surface after scraping, lets the glass surface general like the lotus leaf surface, and the raindrop gathers into the raindrop at glass, when installing on wiper device, when the speed of a motor vehicle reaches more than 50 kilometers, the raindrop can float upwards for the person of driving in sleet weather, no matter sleet size, can both keep the field of vision clear, more be favorable to driving safety. Compared with common rubber windscreen wipers and coated silica gel windscreen wipers, the silica gel windscreen wiper made of the new material has longer service life, and silica gel strips are not afraid of ultraviolet rays, wear-resistant, resilient, high-temperature resistant, low-temperature resistant and free of cracking.
In addition, the silica gel strip can be also arranged on a common glass cleaning and drying device (a wiper) and used for cleaning room glass, building glass outer walls and furniture or ornaments with plane glass decoration.
Claims (3)
1. A silica gel strip which is characterized by comprising 88-90% of silica gel and 10-12% of lubricating material by mass percent;
wherein the lubricating material is resin powder;
the resin powder is melamine resin powder, and the particle size of the melamine resin is 110 mu m;
the preparation method of the silica gel strip comprises the following steps:
1) preparing raw materials: adding 10-12% of lubricating material into the raw material silicon rubber compound;
2) rubber mixing: feeding the materials in the step 1) into an internal mixer for mixing, internally mixing and discharging;
3) cutting;
4) hot-press forming;
5) vulcanizing;
6) checking;
7) removing edges;
8) post-treatment;
9) checking;
10) packaging;
wherein, the rubber mixing temperature in the step 2) of the preparation method is 40-50 ℃, and the rubber mixing time is 30 minutes;
the preparation method comprises the step 4), wherein the hot-pressing molding is carried out in a hot press, the upper mold temperature is 195 ℃, the lower mold temperature is 190 ℃, and the molding time is 430 seconds.
2. Use of the silicone strip of claim 1 in glass wiping.
3. Use according to claim 2, for mounting on a vehicle wiper for cleaning a vehicle glazing or on a glazing cleaning squeegee for cleaning a household or architectural glazing.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617908A (en) * | 2001-12-06 | 2005-05-18 | M·马纳格门特-特克斯有限公司 | Improved windshield wiper having reduced friction characteristics |
| CN1706888A (en) * | 2004-06-11 | 2005-12-14 | Sar控股国际有限公司 | Self-lubricant organosilicone rubber material and its prepn proess and use |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617908A (en) * | 2001-12-06 | 2005-05-18 | M·马纳格门特-特克斯有限公司 | Improved windshield wiper having reduced friction characteristics |
| CN1706888A (en) * | 2004-06-11 | 2005-12-14 | Sar控股国际有限公司 | Self-lubricant organosilicone rubber material and its prepn proess and use |
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