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Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.

18 yearsFocus on R & D and production of silicone rubber products

Become a respected supplier of silicone rubber products

Service Hotline:

+86-136 6988 8704

Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.
18 years focus on silicone rubber products research and development and production
Professional customization

Dongguan Minz Rubber & Plastics Co., Ltd.

Add.: No.4, New Industrial Road, Shipai Tangwei, shipai town, Dongguan City
Tel: +86-0769-8665 2688
Fax: +86-796-8180 6477
Contact: Miss Li +86-136 6988 8704
Mailbox:lixiaoxia@dgminz.com.cn

Cause silicone tube tolerance size yellowing reasons

Cause silicone tube tolerance size yellowing reasons

2020-11-19 11:51:07

What is the reason for the size of the silicone tube tolerance? There are tolerances in the production of any product. This tolerance is related to many factors. 1. Due to the influence of the head temperature, under the same extrusion conditions, if the head temperature is too low, the inner diameter of the extruded silicone sleeve becomes larger, and the wall thickness of the silicone hose becomes thinner. When the extrusion temperature is higher, the inner diameter of the silicone hose becomes smaller, and the wall thickness of the silicone hose becomes thicker. 2. Due to the influence of the melting point and fluidity of the extruded material, the fluidity of the silicone key material is closely related to the temperature. With the increase of temperature, the apparent viscosity of the material decreases and the fluidity is good. When the temperature of the machine head decreases, the apparent viscosity of the material is higher and the fluidity is poor. Forced extrusion makes the pressure of the machine head plus the sealing ring large, and the tube blank from the die produces elastic recovery due to the release of stress, the degree of expansion is also proportional to the previous pressure. At the same time, the poor fluidity of the material makes the material less extruded, resulting in the inner diameter of the silicone hose becoming larger and the wall thickness becoming thinner. With the gradual increase of temperature, the flow performance of the extruded material in the machine head is improved, the pressure of the machine head is reduced, and the extrusion inner diameter is reduced due to the corresponding reduction of stress elastic recovery. On the other hand, the extrusion amount of the material increases with the improvement of the flow performance of the silicone product factory, which thickens the wall of the silicone hose. 3, the influence of different screw speed and traction speed, at the same temperature, the diameter and wall thickness of the extruded silicone sleeve has a great relationship with the screw speed and traction speed. With the increase of the extrusion speed, the inner diameter of the silicone sleeve will become larger and the pipe wall will become thinner. The lower the head temperature, the more obvious the change will be. What is the cause of yellowing of transparent silicone products? Transparent silicone products have yellowing in a few years or months after production of seals. Sometimes during production, some newly released transparent silicone products look yellow and seem to have changed color. The properties of vulcanizing agent are divided into common type and yellowing resistance. Its application scope includes rubber products in the following two aspects:. 1. The ordinary type does not resist yellow vulcanizing agent, which can be used for some non-exposed silicone products with relatively deep color or low color requirements. 2. Anti-yellowing vulcanizing agent is applied to products that need to be exposed, have lighter and brighter colors, and require higher rubber buttons for colors. Sometimes we add anti-yellowing vulcanizing agent to the rubber compound, but the transparent silica gel product still looks yellow after molding, which may be that the anti-yellowing ability of the raw material is too poor, and the suggestion for the raw material with poor yellowing resistance is to change the material directly.

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What are the characteristics of silicone ring and silicone products

What are the characteristics of silicone ring and silicone products

2020-11-14 16:50:21

The temperature range of silicone ring is generally -60 ℃ ~ 250 ℃, the hardness range is Shore A25 to 90 degrees, and the cold resistance of O-ring is -20-30 degrees later for ordinary rubber, I .e. silicone rubber still has good elastic silicone product properties at -60-70 degrees. Some specially formulated silicone rubber can also withstand extremely low temperatures, such as low temperature sealing rings, O-ring silicone because of its environmental performance and more and more popular, to understand the knowledge of silicone products, from the silicone raw materials, color: black, brown, green silicone button color, white, red brown, yellow, blue, red, orange, transparent, gray, can also be specified by the customer color. Silicone ring has excellent heat resistance, low temperature elasticity and particularly excellent oxidation and ozone resistance, high air permeability and selectivity to gas permeation through sealing ring, and good electrical insulation performance (silicone ring has low surface energy, hygroscopicity, can play an isolation role, water resistance, but poor water vapor resistance, pressure above 50psi is not recommended, and is compatible with most oils, chemicals and solvents, A liquid silicone rubber like silicone rubber acid and alkali resistance (refers to the acid or alkali water immersion endurance) is good, polar solvent resistance is acceptable, not resistant to alkane hydrogen and aromatic oil. Rubber has been focusing on customization for decades. Customized perfect solutions and providing high-quality services highlight the new generation's pursuit of the new era goal of silicone products factories. Silicone products are mainly used for molded products. What is the use of silicone tube error, the main factors that affect the error of silicone tube are subjective factors and objective factors. 1. Due to the influence of the head temperature, under the same extrusion conditions of the silicone key manufacturer, if the head temperature is too low, the inner diameter of the extruded silicone sleeve becomes larger, and the wall thickness of the silicone hose becomes thinner. When the extrusion temperature is higher, the inner diameter of the silicone hose becomes smaller, and the wall thickness of the silicone hose becomes thicker. 2. Due to the influence of sealing elements and fluidity of the melting point of the extruded material, the fluidity of the material is closely related to the temperature. With the increase of temperature, the apparent viscosity of the material decreases and the fluidity is good. When the temperature of the machine head decreases, the apparent viscosity of the material is higher and the fluidity is poor. Forced extrusion of rubber products makes the pipe blank of the machine head pressure increase and the elastic recovery occurs due to the release of stress, its expansion level is also proportional to the previous pressure, and the poor fluidity of the material makes the material less extruded, resulting in the inner diameter of the silicone hose becoming larger and the wall thickness becoming thinner. With the gradual increase of the temperature of the rubber button, the flow performance of the extruded material in the head is improved, the pressure of the head is reduced, the amount of elastic recovery of the off-mold tube blank is correspondingly reduced, and the extrusion inner diameter is reduced. On the other hand, the extrusion amount of the material increases with the improvement of the flow performance, so that the wall of the silicone hose is thickened.

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What is the reason why the silicone sealing strip is not smooth

What is the reason why the silicone sealing strip is not smooth

2020-11-12 15:23:31

Now the use of this item is very much, but some people will find that sometimes the surface just bought is not smooth enough, which directly affects the use of the effect, in order to deal with this problem, find out the reason is necessary, and then take measures for the original silicone products, then what is the reason for the use of silicone products is not smooth. 1. First confirm whether it is because of the mold. If the mold itself is not smooth, the surface of the foamed silicone rubber strip and other products produced will not be smooth. 2. Check whether the curing agent is added enough. If the amount of curing agent is insufficient, the surface of the product will be cured insufficiently and there will be a sticky feeling. 3. Check whether the curing agent is evenly stirred. If the curing agent is not evenly stirred, there will be sufficient curing and insufficient curing. At the same time, the silicone in the silicone can be applied to electronic devices: bonded to seals, potting glue, gel, insulating coated liquid silicone rubber, thermal conductive glue and other materials, these materials are used to protect the engine control module, the ignition coil is in the ignition module, Power system module, power system, lighting system, various sensors, connections, etc., this is bonded to the sealant, it is used in various silicone product factory control modules as bonding and fixing of components on circuit boards, or auxiliary fixing of large components, such as capacitors, inductors and electric coils, to prevent components from falling off due to vibration, and has the functions of fixing and damping. Silicone sealing strips from silicone key manufacturers have been applied to various industries such as automobiles, doors and windows, cabinets, refrigerators, containers, etc. According to the requirements of different industries, they have successively developed unique automotive sealing strips, mechanical sealing strips, door and window sealing strips and other products. Therefore, they are widely used in sealing industries such as seals, electronics, lighting, pharmaceuticals, chemicals, machinery and equipment, textile and chemical fiber, automobiles, etc. Silicone sealing strips can be applied in many fields, such as the following aspects:. 1. Silicone sealing strips can be applied to the exhaust system shaft seals, spark plugs and ignition wires of rubber products in transportation. 2. Silicone sealing strips are used in wireless motors, such as high-voltage caps in televisions and oscilloscopes. 3. The silicone sealing strip is used in the rubber button sealing ring that contacts the gas. 4, applied in electronic computers. 5. There are many applications in the field of motors. 6. It can also be used in instruments and meters, such as far-infrared heater door seals, refrigerator defrosting lines, and instrument shock absorbers.

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Mold silicone operation silicone products color matching difference

Mold silicone operation silicone products color matching difference

2020-11-12 14:55:31

Mold silicone operation method. 1. Silicon (rubber sealing strip manufacturer introduces uniform mixing of silica gel and curing agent: mold (title: mother of industry) silica gel appearance is flowing liquid, component A is silica gel, component B is curing agent, O-ring seal insulation silica gel product thermal silica gel pad, excellent high temperature resistance, silica gel (food grade silica gel) can withstand high temperature of 200 ℃ and can be used for a long time, the raw materials of this product meet SGS standard, through FDA food grade silica gel testing standard, tasteless and nontoxic, the manufacturer's silica gel keys are produced according to the mold, and the color and shape can be customized. For example, 100 grams of silica gel are taken and 2 grams of curing agent are added. Note: silica gel and curing agent must be stirred evenly, if not stirred evenly, the mold will appear a piece has been cured, a piece of no curing seal ring, silica gel will appear drying and curing uneven condition will affect the service life of silica gel mold and turnover times, and even cause the mold scrap condition. 2. Vacuum bubble removal treatment: silicon (after the glue and curing agent are mixed evenly, vacuum liquid silica gel is evacuated to remove bubbles. The vacuuming time should not be too long. Under normal circumstances (under normal circumstances, do not exceed ^ minutes. If the vacuuming time is too long, the silica gel will solidify immediately, resulting in cross-linking reaction, which makes the silica gel become piece by piece and cannot be painted or poured, thus the silica gel product factory wastes silica gel, silicone can only be poured into the trash can, and then take silicone to do it again. Silica gel as the main raw material processing works, known as silica gel products, silica gel is a silica gel properly dehydrated from the particle size of different porous silica gel key manufacturers material, with an open porous structure, can absorb many substances, is a good desiccant, adsorbent and catalyst carrier. First understand the color matching and color matching of silicone products are two different concepts. The color matching of seals is that we first have a target color, then match the color masterbatch according to our experience, match all kinds of color masterbatch in proportion, and then match the color into products close to the target color, while the color matching is to adjust the existing color into rubber products close to the target color. The operation of color matching between the two needs to be based on the lag of color matching, while different color matching needs to draw up the formula from scratch and change the color. For the color matching and color matching of silicone products, the operator must have rich experience in rubber key operation and good color resolution, and he must understand and be familiar with the flexible use of various color masterbatch, moreover, the whole color matching process should be based on the slow transition from light color to dark color, and the corresponding data of the number should be recorded for each color matching.

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How to determine the hardness standard of silicone products

How to determine the hardness standard of silicone products

2020-11-07 11:55:48

Silicone tube is the circulation and coating carrier of liquid, gas and other materials. It is widely used in modern industry, national defense industry and daily necessities. When producing silicone tube, a small mistake may make its hardness high. What should I do? If silicone products reduce the hardness of silicone tube and reach the product index, the finished silicone tube cannot change its hardness. This is for vulcanized silicone tube, there are mainly the following methods:. 1. If the cost is not considered, the silica gel key component of the oil can also be increased, and the carbon black parts can be appropriately reduced. If the basic silica gel material has not been produced, the amount of oil must be increased in the formula. The hardness of the finished silica gel tube cannot be changed. 2, or look at what material is the sealing ring silicone tube products, so that it continues to vulcanize, to over vulcanization, can also reduce the hardness, but the performance of the product is not guaranteed. 3. You can use an oven to vulcanize the surface products to return to the original, so as to achieve the purpose of reducing the hardness. The liquid silica gel cannot guarantee the degree index to be achieved. Rubber tube refers to the tube used for gas transportation, which is commonly used in gas welding, gas cutting, various gas shielded welding, plasma arc welding and cutting, etc. What are the inspection standards for rubber tubes used in silicone rubber products, as follows:. 1. Like hose size measurement: inner diameter, outer diameter, outer diameter of reinforcement layer, wall thickness, concentricity, inner and outer layer glue thickness, inner diameter of assembly, the new national standard and ISO have added length and measurement point marks, and stipulated the measurement method of hose length without pipe joints and joints of various pipe silicone key manufacturers. 2. Hydraulic test verification pressure test: check whether the hose and assembly have leakage, deformation and damage for 30s-60s under the verification pressure. Pressure deformation test: keep it for 1 minute under the specified pressure (seal working pressure verification pressure or other pressure lower than the verification pressure), and measure the length and outer diameter change, torsion angle and bending of the hose. Burst pressure test: measure the pressure of rubber products when rubber hoses burst at the specified boosting speed. Leakage test: store for 5min at a static pressure of 70% of the minimum burst pressure and repeat it once to check for leakage or damage. As the test often uses water, which is different from the viscosity of the actual liquid, the burst pressure and leakage pressure measured at normal temperature of rubber keys may be slightly lower. 3. Low temperature bending test Low temperature rigidity: The rubber hose is clamped on a torsion wheel with a diameter of 12 times the inner diameter of the rubber hose. After being parked at low temperature for 6 hours, the ratio of the torque measured when twisting 180 degrees within 12s to the torque measured at standard temperature.

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