CN106543721A - Silica gel strip and its preparation method and application - Google Patents

Abstract

The present invention provides a silicone strip, which is made of 85-90% by mass of silicone and 10-15% of a lubricating material. The lubricating material is graphite powder or resin powder. The silicone strip provided by the present invention can be used for automobile windshield wipers or ordinary glass wipers. The silicone strip can achieve the effect of quickly cleaning glass without coating, without jumping, shaking, or noise problems, and has cold resistance, heat resistance, ultraviolet resistance, ozone resistance, abrasion resistance, and long service life.

Description

Silica gel strip and its preparation method and application

technical field

The invention relates to the field of cleaning, in particular to the field of glass cleaning, and more particularly to improving the silicone strip in the scraper dryer.

Background technique

Wipers, also known as wipers, wipers, water dials, wipers or windshield wipers, are devices used to scrape off the rain, snow and dust attached to the windshield of the vehicle to improve the visibility of the driver. Increase driving safety. Cars almost everywhere have windshield wipers because they are required by law. Vehicles such as hatchbacks and recreational vehicles also have wipers on the rear windows. In addition to cars, other means of transportation are also equipped with wipers, such as trains and trams. Some engineering tools, such as cranes, are also equipped with wipers. The service life of the wiper mainly depends on its scraping strip. Generally speaking, most of the scraping strips are made of rubber.

In the current wiper blades, the wiper strip is only deformed by the force given by the wiper when it is in contact with the glass, so that the wiper strip is closely attached to the glass surface, but the material of the surface coating of the wiper strip is in contact with the glass. For the purpose of wiping, although the coating will make the wiper more slippery, it will also cause problems such as tail swinging, vibration, and noise. At the same time, the complex conditions of the external environment, such as sunlight, ultraviolet rays, temperature changes, acidic substances in the air, etc., accelerate the aging of the rubber scraper, which further affects the service life of the wiper scraper.

Silicone rubber (referred to as silica gel) refers to the rubber whose main chain is composed of silicon and oxygen atoms alternately, and there are usually two organic groups attached to the silicon atom. Ordinary silicone rubber is mainly composed of silicone chains containing methyl groups and a small amount of vinyl groups. The introduction of phenyl can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyano can improve the temperature and oil resistance of silicone rubber. Silicone rubber has good low temperature resistance, and generally can still work at -55°C. After introducing phenyl, it can reach -73°C. The heat resistance of silicone rubber is also outstanding. It can work for a long time at 180 °C, and it can withstand a few weeks or longer at a temperature slightly higher than 200 °C. It can still withstand high temperatures above 300 °C instantly. Silicone rubber has good air permeability, and its oxygen transmission rate is the highest among synthetic polymers. Therefore, some companies now introduce silicone wipers that are made of silicone rubber materials.

After the silicone rubber is cured and formed, the surface roughness is very high, and the main component material of the glass is silicon dioxide, and its material compatibility is large (high friction coefficient); Finally, after the close fit, there will be a lot of friction between the two, resulting in unstable scraping action; from the actual phenomenon, it can be observed that the wiper will jump when scraping the glass, resulting in unclean scratches. question.

The current solution to the above problems is to coat a layer of silver-containing coating on the silicone scraper, and use the ability of the silver surface to oxidize rapidly in contact with air to form a layer of silver oxide as a lubricant between the glass and the glass. Reduce friction to solve. However, this method not only adds a processing step to the production process, but also makes the silicone rubber material directly replace the rubber material, and it is meaningless to improve its durability; because of this method, the durability of the silicone scraper will depend on the silver content. The durability of the coating is not the durability of the silicone material. Compared with the traditional rubber scraper, the advantages of its material have not been brought into play.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a silicone strip, which can achieve a good wiping effect without spray coating, and can form a waterproof layer on the glass during the wiping process.

In order to achieve the above object, the present invention provides a silicone strip, which contains 85-90% by mass of silicone rubber and 10-15% of lubricating material.

Preferably, the lubricating material is graphite powder or resin powder.

Preferably, the resin powder is melamine resin powder.

The present invention also provides the preparation method of above-mentioned silica gel strip, comprises the steps:

1) Raw material preparation: add 10-15% lubricating material to the raw material silicone rubber compound;

2) Rubber mixing: the materials in step 1) are sent into the internal mixer for mixing, internal mixing, and discharging;

3) cutting material;

4) hot pressing molding;

5) vulcanization;

6) inspection;

7) Remove the edge;

8) post-processing;

9) Inspection;

10) Packaging.

Preferably, the mixing temperature in the step 2) is 40-50° C., and the mixing time is 30 minutes.

Preferably, the thermocompression forming in step 4) is carried out in a thermocompressor, the temperature of the upper die is 195°C, the temperature of the lower die is 190°C, and the molding time is 430 seconds.

Except for the specially marked process conditions, the above processes are the same as the existing processes.

The present invention also provides the use of the above-mentioned silica gel strip in glass scraping.

Preferably, it is installed on a car wiper to clean car glass or on a glass cleaning wiper to clean home or building glass.

The silicone strip provided by the present invention is made by mixing silicone rubber raw materials with a lubricating material that is easy to break through the above process. When rubbing against glass, the self-lubricating property of the contact surface is increased due to the continuous slight fracture, and the two friction between them.

The existing manufacturing process of silica gel strips is: raw material preparation→rubber mixing→cutting→hot pressing→vulcanization→inspection→edge removal→spray coating→post-processing→inspection→packaging.

Compared with the existing process, the process flow provided by the invention reduces the steps of spray coating and reduces the cost. The finished product of the windshield wiper that is made, its external dimension is completely in accordance with the specification of the general silica gel windshield wiper that is currently commercially available.

The beneficial effects of the present invention are: the present invention provides a silica gel strip and a preparation method thereof, the silica gel strip is added with a lubricating material, when rubbed against glass, the self-lubricating property of the contact surface is increased due to continuous slight fractures, reducing the The friction between the two is reduced; the scraped glass surface has no attachments, which reduces the adhesion and can fully express the cohesion of water, just like the surface of a lotus leaf. Raindrops will converge into raindrops on the glass surface, which can be used in cars. When the wiper is on, the driver can maintain a clear vision even at night and in rainy days, which improves the safety of driving. When used to clean other glass or planes, it can make the scraped glass or planes less prone to water stains and easy to clean. In the preparation method of the silica gel strip, the steps of spray coating are reduced, and the production cost is reduced. At the same time, no coating is sprayed, so that the life of the wiper strip is no longer limited to the durability of the coating, but reflects the high durability of silicone rubber.

In terms of performance, the main component of silicone rubber in the silicone strip is mainly composed of silicon dioxide, which has cold resistance, heat resistance, ultraviolet resistance, ozone resistance, abrasion resistance, and long service life. It won't make your hands black when you hold it in your hand, and there is no greasy, sticky feeling. In terms of environmental protection, the silicone strip itself has no environmental problems and can be 100% recycled. Even if it is discarded, it will not cause environmental pollution, nor will it cause poisonous gas when burned in an incinerator, and will not damage the structure of the incinerator.

Description of drawings

Figure 1 is a schematic diagram of the maximum tensile test device for testing the static friction between a silica gel strip and ordinary glass according to the present invention.

Fig. 2 is a schematic diagram of the test wiper function of the present invention.

Description of drawings

1: tension test bench; 2: tension controller; 3: tension detector; 4: weight; 5: test sample; 6: ordinary glass; 7: marking section; 8: window glass; 9: test sample; A: the first test section; B: the second test section; C: the third test section.

detailed description

The silicone rubber raw materials used in the present invention are purchased from Maigao 100% Silicone Company in Taiwan, China. The test rubber strips and silver-coated silica gel strips are all commercially available products.

The melamine resin (melamine-formaldehyde resin) used in the present invention is the polymer obtained by the reaction of melamine and formaldehyde, which is commercially available, and the specification is fineness: 90% passes through an 80-mesh sieve, content≥99%, moisture and volatile matter≤4, glue Bonding strength ≥ 1.7mpa, free formaldehyde precipitation ≤ 30mg/l, pH value 7-8, water insoluble matter ≤ 0.5.

The graphite used in the present invention is graphite powder, which is commercially available, and has a specification of more than 99% of fixed carbon content, less than 0.7% of ash content, less than 0.5% of water content, and more than 90% of effective particle size.

It should be noted that the silicone rubber is in the form of semi-finished mixed rubber before molding. The present invention uses various types of mixed rubber to conduct tests and finds that the different types of mixed rubber raw materials do not affect the lubricating performance of the product silicone strip, and the important role is Add lubricating materials, and in order to ensure the consistency of the test results, one of the types of compound rubber HCE GF171 is selected as the silicone rubber raw material to verify the effect of the silicone strip.

The verification test of the new material in the present invention mainly adopts the scheme that the newly configured raw material formula is made into a finished wiper according to the above-mentioned process flow, and its external dimensions are completely in accordance with the specifications of the general silicone wipers currently available on the market. Then the function of its wiper is compared with each other.

Example 1

Add 10% mass percentage of melamine resin powder to the rubber compound HCE GF171 to make a silica gel strip. The preparation process is as follows:

1) Raw material preparation: add 10% melamine resin powder to the rubber compound HCE GF171;

2) Rubber mixing: put the material in step 1) into the internal mixer for mixing, internal mixing, and discharge, wherein the rubber mixing temperature is 45°C, and the rubber mixing time is 30 minutes;

3) cutting material;

4) Hot press molding: Hot press molding is carried out in a hot press machine, the temperature of the upper mold is 195°C, the temperature of the lower mold is 190°C, and the molding time is 430 seconds;

5) vulcanization;

6) inspection;

7) Remove the edge;

8) post-processing;

9) Inspection;

10) Packaging.

Example 2

12% by mass of melamine resin powder was added to the rubber compound HCE GF171 to make a silica gel strip. The preparation method was the same as in Example 1, except that the mass percent of the melamine resin was adjusted.

Example 3

15% by mass of melamine resin powder was added to the rubber compound HCE GF171 to make a silica gel strip. The preparation method was the same as in Example 1, except that the mass percent of the melamine resin was adjusted.

Example 4

5%, 10%, 12%, 15%, and 20% graphite powder were added to the rubber compound HCE GF171 respectively to make 5%, 10%, 12%, 15%, and 20% graphite components The silica gel strip, preparation method is the same as embodiment 1, only need change the graphite powder of corresponding content into the melamine resin powder in step 1).

The silica gel strips that were not prepared in the preceding examples, but used in subsequent tests, were also prepared by the method in Example 1.

Example 5

The test method is shown in Figure 1: fix ordinary glass 6 on the tensile test bench, cut rubber strips, silver-containing silica gel strips, and silica gel strips made of mixed rubber HCE GF171 into 20mm lengths as test samples 5, and test sample 5 It is bonded to the ordinary glass 6, and a 12g iron block is placed on the test sample 5 as a weight 4 to apply pressure to the test sample 5 and the ordinary glass 6. The test sample 5 is connected to the tension controller 2, and the tension is applied to the tension detector 3. Record the maximum pulling force when the maximum static friction is converted into dynamic friction, wherein the pulling force detector 3 is a pulling force gauge. The results are shown in Table 1.

Among them, rubber strips and silver-coated silica gel strips are commercially available, and the silica gel strips are prepared according to the method in Example 1 without adding lubricating materials.

Table 1: Maximum tensile test record of static friction between rubber, silver-containing silicone strips, silicone strips and ordinary glass

item Sample No name Material specification Maximum pulling force (N) a-1 1308121 rubber strip 0.025 a-2 1308122 Silver coated silicone strips 0.013 a-3 1308123 Silicone Rubber compound HCE GF171 0.546

From the test results in the above table, it can be seen that the tensile force required to transform the static friction of the silicone strip without adding lubricating materials into dynamic friction is the largest. This result serves as a reference for the development of new material experiments.

Example 6

In embodiment 5, test sample 5 in the test method as shown in Figure 1 is changed to the silica gel strip that rubber mix HCE GF171 mixes 20% graphite powder to make, and the preparation method of silica gel strip is as shown in embodiment 1, wherein each group of graphite powder The particle size is different to determine the effect of graphite powder particle size on friction loss. The results are shown in Table 2.

Table 2: Maximum tensile test record of static friction between silica gel strip and ordinary glass

item Sample No name Material specification control condition Maximum pulling force (N) b-1 1308021 Graphite Silicone Strips Contains 20% graphite Graphite powder particle size 1.5u 0.027 b-2 1308022 Graphite Silicone Strips Contains 20% graphite Graphite powder particle size 2.5u 0.056 b-3 1308023 Graphite Silicone Strips Contains 20% graphite Graphite powder particle size 4.0u 0.062 b-4 1308024 Graphite Silicone Strips Contains 20% graphite Graphite powder particle size 10u 0.134 b-5 1308025 Graphite Silicone Strips Contains 20% graphite Graphite powder particle size 15u 0.141

From the test results in the table above, it can be seen that graphite powder can reduce the friction between silica gel and glass, and the smaller the particle size of graphite powder, the smaller the friction between silica gel and glass.

Example 7

In embodiment 5, test sample 5 in the test method shown in Figure 1 is changed to the silica gel strip that the graphite powder that mixed rubber HCE GF171 particle diameter is 1.5u makes, and the preparation method of silica gel strip is as shown in embodiment 1, wherein The content of graphite powder in each group is different to determine the influence of graphite powder content on friction loss. The results are shown in Table 3.

Table 3: Maximum tensile test record of static friction between silica gel strip and ordinary glass

item Sample No name Material specification control condition Maximum pulling force (N) c-1 1308131 Graphite Silicone Strips Graphite powder particle size 1.5u Containing graphite ratio 5% 0.652 c-2 1308132 Graphite Silicone Strips Graphite powder particle size 1.5u Containing graphite ratio 10% 0.055 c-3 1308161 Graphite Silicone Strips Graphite powder particle size 1.5u Containing graphite ratio 15% 0.023 c-4 1308251 Graphite Silicone Strips Graphite powder particle size 1.5u Containing graphite ratio 12% 0.034

From the above test results, it can be seen that the proportion of graphite powder in the silica gel strip can effectively reduce the friction loss when the proportion of graphite powder is 10-15%. Repeated tests have found that if the proportion of graphite powder continues to increase, the wear resistance of the silica gel strip will decrease and the service life of the silica gel strip will be reduced. When the proportion of graphite powder is maintained at 10-15%, it can reduce friction loss, wear resistance, and maintain the best comprehensive effect of service life.

Example 8

In Example 5, the test sample 5 in the test method shown in Figure 1 is replaced with a silica gel strip made of melamine resin powder with a mixing rubber HCE GF171 particle size of 110u. The preparation method of the silica gel strip is as shown in Example 1. The content of melamine resin powder in each group is different to determine the effect of melamine resin powder content on friction loss. The results are shown in Table 3.

Table 4: Maximum tensile test record of static friction between silica gel strip and ordinary glass

item Sample No name Material specification control condition Maximum pulling force (N) d-1 1309151 Silicone strip with resin Melamine resin particle size 110u The proportion of melamine resin containing 5% 0.072 d-2 1309161 Silicone strip with resin Melamine resin particle size 110u The proportion of melamine resin is 20% 0.012 d-3 1310201 Silicone strip with resin Melamine resin particle size 110u The proportion of melamine resin is 15% 0.015 d-4 1310251 Silicone strip with resin Melamine resin particle size 110u Containing 10% of melamine resin 0.015 d-5 1312111 Silicone strip with resin Melamine resin particle size 110u The proportion of melamine resin is 12% 0.012

From the above test results, it can be seen that the proportion of melamine resin in the silica gel strip can effectively reduce the friction loss at 10-15%. Repeated tests have found that continuing to increase the proportion of melamine resin can also reduce friction loss, but the wear resistance of the silica gel strip decreases, reducing the service life of the silica gel strip. When the proportion of melamine resin is kept at 10-15%, it can reduce friction loss, wear resistance, and maintain the best comprehensive effect of service life.

Example 9

The above-mentioned silicone strips and silicone strips containing lubricating materials were cut according to the specifications of commercially available wipers, and then installed on the car wiper device with the finished rubber strips and silver-coated silicone strips to test the scraping effect.

As shown in Figure 2: the wiper rubber strip of the tested object, that is, the test sample 9 is installed on the car wiper device, the tested car window glass 8 is sprayed with an aqueous solution containing blue pigment, and the car wiper function is turned on to allow the wiper to scrape. The window glass 8 records the number of jumps that occur when the test sample 9 scratches the window glass 8 in the three test sections A, B, and C areas within the range of the marking section 7 on the window glass 8 . The results are shown in Table 2.

Table 5: Function test record of rubber wiper, silver-containing silicone wiper, graphite-containing silicone wiper, resin-containing silicone wiper and automobile glass wiper

Test results: Both the new material silicone wiper and the silver-coated silicone wiper scratched the glass with water, and there was no scratch on the glass surface, but the silver-coated silicone wiper produced a higher number of jumps . However, rubber wipers and uncoated silicone strip wipers will not only jump, but also scratch the glass, damage the glass, affect the driving line of sight, and are not conducive to driving safety.

From the above test results, it can be seen that the silicone strip wiper with an appropriate content of lubricating material greatly reduces the jumping and shaking during the scraping process, and also avoids the noise caused by jumping and shaking.

In addition, since the silicone strip wiper of the new material forms a layer of super-hydrophobic structure on the glass surface after being scraped, the glass surface is like a lotus leaf surface, and raindrops gather on the glass to form raindrops. When installed on the wiper device, when the vehicle speed When it reaches more than 50 kilometers, the raindrops will float upwards, so that the driver can maintain a clear vision in rainy and snowy weather, regardless of the size of the rain and snow, which is more conducive to driving safety. Silicone wipers made of new materials have a longer life than ordinary rubber wipers and coated silicone wipers. The silicone strips are not afraid of ultraviolet rays, abrasion resistance, resilience, high temperature resistance, low temperature resistance, and will not crack.

In addition, the silicone strip can also be installed on ordinary glass cleaning wipers (wipers) to clean living room glass, architectural glass exterior walls, furniture or decorations decorated with flat glass.

Claims (8)

1. a kind of silica gel strip, it is characterised in that the silicone rubber containing mass percent 85-90% and 10-15% Lubriation material.

2. silica gel strip as claimed in claim 1, it is characterised in that the lubriation material is graphite powder or tree Cosmetics.

3. silica gel strip as claimed in claim 2, it is characterised in that the resin-oatmeal is melamine resin powder.

4. the preparation method of the silica gel strip as described in any one of claim 1-3, it is characterised in that include as Lower step：

1) raw material prepares：Add the lubriation material of 10-15% in raw material silicon rubber gross rubber；

2) refining glue：By step 1) in material send into banbury mixed, banburying, discharging；

3) cut out material；

4) it is hot-forming；

5) vulcanize；

6) check；

7) tear side open；

8) post processing；

9) check；

10) pack.

5. the preparation method of silica gel strip as claimed in claim 4, it is characterised in that the step 2) in Glue furnacing temperature is 40-50 DEG C, and the refining glue time is 30 minutes.

6. the preparation method of silica gel strip as claimed in claim 4, it is characterised in that the step 4) in It is hot-forming to carry out in hot press, 195 DEG C of mould temperature thereon, 190 DEG C of lower mould temperature, molding time 430 Second.

7. purposes of the silica gel strip as described in claim 1-3 in glass scraper is dry.

8. purposes as claimed in claim 7, it is characterised in that for cleaning on automobile wiper Vehicle glass is arranged on cleaning household or building glass on cleaning glass wiper.