Liquid Silicone Rubber LSR Injection Mold Making Supply

Liquid silicone rubber injection molding is the most precise,efficient,and safest and manufacturing process, the products by LSR injection molding with mini parting line and no and less silicone rubber burrs. Welcome to our website: http://www.lsr-molding.com/ Admin: admin@better-silicone.com

how rubber is made?

Rubber is a kind of high elastic polymer material with reversible deformation. It is elastic at room temperature and can produce large deformation under small external force.Rubber is a completely amorphous polymer with a low vitrified transition temperature (T g) and a high molecular weight of more than hundreds of thousands.
Early rubber was made from rubber latex from plants such as rubber trees and grass, which was made of flexible, insulative, impervious to water and air.High elastic polymer compound.It is divided into natural rubber and synthetic rubber.Natural rubber is made from rubber tree, rubber grass, etc.Synthetic rubber is produced by polymerization of various monomers.Rubber products are widely used in industry and life.

The word rubber comes from the Indian ucau chu, meaning "the weeping tree."Natural rubber is made from rubber latex which flows out of the rubber tree when it is cut by three-leaf rubber tree after solidification and drying.In 1770, the British chemist j. Priestley discovered that rubber could be used to erase pencil marks.The molecular chain of rubber can be crosslinked. When the rubber is deformed by external forces, it has the ability to recover quickly and has good physical and mechanical properties and chemical stability.Rubber is the basic material of the rubber industry and is widely used in the manufacture of tires, rubber pipes, tape, cables and other rubber products.

Natural rubber is made from latex, and some of the non-rubber ingredients in latex are left in solid natural rubber.In general, the rubber hydrocarbon in natural rubber is 92% to 95%, while the non-rubber hydrocarbon accounts for 5% to 8%.Due to different preparation methods, different producing areas and even different season of glue collection, the proportion of these ingredients may be different, but they are basically within the range.
Protein can promote the vulcanization of rubber and delay the aging.On the other hand, protein has strong water absorption, can cause the rubber moisture absorption mildew, the decline of insulation, protein also has the disadvantage of increasing the heat generation.
Acetone extract is senior fatty acids and sterols substances, including some role natural protective agent and accelerator, and can help powder compound in the process of mixing dispersion and raw rubber softening effect.
In the ash mainly containing magnesium phosphate and calcium phosphate salts, have a very small amount of copper, manganese, iron and other metal compounds, because the base metal ions can promote the rubber aging, so their content should be controlled.

Moisture in the dry glue not more than 1%, in the process of machining can be volatile, but when moisture content is too much, not only can make the rubber easy mold storage process, but also affects the rubber processing, such as mixed compound easy cluster;Bubbles are easy to be produced in the process of calendering and pressing, and bubbles or spongy are produced in the process of vulcanizing.

Keyboard Skin With Radium

The Keyboard Skin With Radium is actually a key product which is processed and produced by radium carving technology. It belongs to the product classification of silicone Keyboard.

The Keyboard Skin With Radium mainly adopts the principle of laser surface treatment of a process, a lot of key manufacturers will use laser carving technology to create products that are often used in mobile phones, electronic dictionaries, remote control, the keys on the keyboard light products, the "light" radium carving craft key will make the product more beautiful and natural.

Product specification

Materials: silicone material:

Technology: silicone material molding, screen printing, spray oil, radium carving, edge removal;

Available colors: common colors are black, gray, white, blue, green, purple and any other color.

Application: toy button, calculator, bank cipher, scanner key, keyboard key, machine device key, etc.

Features: the buttons are environmentally friendly, non-toxic, tasteless and harmless.

Bad reasons

Generally USES a laser carving craft radium vulture may appear when the bad situation, mainly because the parameter is not set, the starting end delay and delay bad cooperation, in addition it is possible that the paint spray is not uniform.Of course, you will be too much power of the edge looks will film, but in fact play jiao, focal type buttons will lead to bad, the solution is the machine parameters to adjust, also can use alcohol to clean the laser carving equipment.

Rubber valve cover gasket

Use rags to catch old TV so it doesn't fall into the engine.Once the cover and joint surfaces are clean and dry, install the new RTV in the same location and install the new washer.Bonnet gaskets are used to seal "dry", so do not use sealant on the surface of the washer.

If you can see the top of the valve at the top of your running engine, you will see a lot of oil splashing around.The bonnet catches the oil and sends it back to the engine.But over time, the valve covers the gasket and contracts, stiffens and begins to leak oil.On a v-shaped engine, the leaking oil usually drips down the side of the engine (in your driveway) and turns to black sludge.But on a four-cylinder engine, it can leak into the spark plug and cause a fire.Replacing gaskets on v - type engines is a profession.But you can replace the washer with a four-cylinder engine.

Start with the decorative plastic cover on top of the engine (if equipped).Next, remove (and label) any hoses, cables and electrical connectors connected to the valve cover.Then remove the spark plugs.
If you see any oil pool in the spark plug, clean it up with a duster with a screwdriver.Take out as many guns as you can, then remove them, and if necessary, replace the spark plugs with a new spark plug before proceeding.Once the new plug is installed, remove the cover retaining bolt and note the length and position of each bolt.Then release the cover and lift it from the engine.
Peel off the old gasket and clean the cover with a brake cleaner and a clean rag.Next, clean the joint surface of the washer on the engine.Use a plastic putty knife (no metal) to cover any traces of the old RTV from the timing belt to the cylinder cover.Use rags to catch old TV so it doesn't fall into the engine.Once the cover and joint surfaces are clean and dry, install the new RTV in the same location and install the new washer (photo 2).The bonnet seal gasket is designed to be sealed and dry, so the seal USES sealant on the gasket surface.
In your workshop manual, complete the work by fastening the valve cover bolts to the torque specification.Please keep in mind that the bonnet bolt specifications are usually shown in pounds per pound.Instead of feet per pound.Inches per pound.Feet per pound.So let's just divide it by 12.
Reinstall all cables, hoses, ignition assemblies and electrical connectors and ignite them.

The tools needed for this project.
Before you start, prepare some necessary tools for the DIY project so you can save time and frustration.
plastic
Putty knife
Rubber mallet
Socket/ratchet set.
You also need a torque wrench.
The materials needed for this project.
Avoid shopping at the last minute and prepare all the materials in advance.This is a list.
The brake is cleaner
Bonnet gasket kit.
Vulcanized (RTV) sealant.

The History of Synthetic Rubber ②

In the past few thousand years, people have been using wooden wheels, or around wheels, with metal rims.In 1845, after Goodyear invented the practical vulcanized rubber, British engineer R.W.Thomson around the wheel set on an inflatable rubber hose, and obtained a patent for the device, in 1890, was officially used on bicycle tyre, in 1895, has been used in all kinds of antique cars.Although rubber is a soft and fragile substance, it is more wearable than wood or metal.The durability, cushioning and other properties of rubber, plus the clever design of the pneumatic tyre, make riders feel more comfortable than ever.As the number of cars increased, so did the demand for rubber for tires.Such a wide range of applications make natural rubber in short supply.Facing the serious situation of rubber production, Countries compete to develop synthetic rubber.

The first thing that comes to mind is the use of the natural rubber structure, isoprene, to make synthetic rubber.As early as 1880, chemists discovered that isoprene had been used for a long time to become soft, and acidified it became a rubbery substance.Kaiser Wilhelm ii had used this material to make a royal car's tire, to show off German chemical prowess.However, using isoprene as the raw material for synthetic rubber, there are two difficulties. One is that the main source of isoprene is the natural rubber itself.The second is in the natural rubber long chain, all isoprene units are oriented in the same direction;In solid tower slope of the long chain, they are strictly in accordance with the a is a reverse direction, and artificial aggregate isoprene units are often no together regularly, get is a kind of slope is not a rubber or a solid tower adhesive material.The substance, which lacks the elasticity and flexibility of rubber, will soon become sticky, so it can't be used to make car tires (the royal car for state events is certainly an exception).

During the first world war, the German adopted dimethylbutadiene to form methyl rubber, which can be mass-produced and cheap.During world war I, Germany produced about 2,500 tons of methyl rubber.Although the rubber was not ideal to withstand pressure, it was eliminated after the war, but it was the first practical synthetic rubber.

Around 1930, Germany and the Soviet union used butadiene as a monomer, as a catalyst, to synthesize a type of sodium butadiene rubber.As a synthetic rubber, the sodium butyl rubber is satisfactory for the rubber plaques.Copolymerization with other monomers can improve the performance of sodium rubber.For example, buna-s are common with styrene, and its properties are very similar to natural rubber.In fact, during world war ii, the German army was because of styrene butadiene rubber, and there was no serious shortage of rubber supplies.The Soviet union used the same method to provide rubber to its troops.

The United States studied synthetic rubber after the war.First, it synthesizes chloroprene rubber, which has some anti-corrosion properties that natural rubber does not have.For example, it has a high corrosion resistance to organic solvents such as gasoline, far from softening and expanding like natural rubber.As a result, the chloroprene rubber is actually more suitable than natural rubber.Neoprene, for the first time made it clear that, as in many other fields, in the field of synthetic rubber, in a test tube products must not only ACTS as a substitute of natural substances, its performance can be better than natural substances.

In 1955, the americans used the catalyst that ziegler used in polyethylene (also known as ziegler, the natta catalyst) to polymerize isoprene.Synthetic natural rubber, which is basically the same as natural rubber, was synthesized by artificial method for the first time.It was not long before the two simplest monomers, ethylene and propylene, were also successful.There are also various types of rubber with special properties.The total production of synthetic rubber now exceeds that of natural rubber.

The History of Synthetic Rubber ①

Humans have been using natural rubber for centuries.Columbus discovered on the voyage of the new world that a ball of native American play was made with a hardened plant SAP.Columbus and later explorers were all amazed at this bouncy ball.Some samples were taken back to Europe as curiosities.It was later discovered that the elastic ball could erase the marks of the pencil and gave it a common name, "rubber."This is still the name of the substance at the moment.This substance is rubber.

But it wasn't until 1839, when Charles Goodyear, an American, succeeded in vulcanization of natural rubber, that rubber became a useful material.The crosslinking of rubber chain is achieved by heating with sulfur, which makes the rubber have good elasticity.Why is rubber elastic?Let's analyze the molecular structure of rubber.The chain monomer of natural rubber molecule is isoprene.We know that the molecular force between the chain and the chain determines its physical properties.In rubber, the interaction between the molecules is weak, because it is not easy to interact with other chains.It's like two friends trying to shake hands, but everyone has a lot of things on their hands, so it's hard to shake hands.The force between rubber molecules determines the flexibility of the rubber.The molecules of rubber are easy to rotate and have ample space for movement, and the arrangement of molecules presents an irregular and random natural state.When subjected to external influences such as bending and elongation, the molecules are forced to show certain regularity.When the outside force is removed, the rubber molecules return to their original irregular state.This is why rubber is elastic.Because of the weak intermolecular force, the molecules can rotate freely, and there is not enough coupling between the molecular chains. Therefore, the molecules will slide between each other and the elastic will not show up.This slip is reduced by intermolecular entanglement.However, the intermolecular entanglement is unstable, and as the temperature increases or the winding of the time is loosened, it is necessary to establish a stronger connection between the molecular chains.This is the cure that Goodyear invented.The vulcanization process usually takes place at a temperature of 140 to 150 degrees Celsius.Goodyear's little stove was heating up.The main effect of vulcanization is simply to form a crosslink between the molecular chain and the molecular chain, thereby enhancing the interaction between the molecular chains.


to be continue...

Do silicone implants have valves?

Silicone valve is in a fluid system is used to control the direction of the fluid, pressure, flow of the device, is to make the piping and equipment within the medium (liquid, gas, powder) flow or stop and can control the flow of the device.The silicone valve is the control part of the pipeline fluid conveying system, which can be used to change the direction of the channel section and the flow direction of the medium, and has the functions of diversion, cut-off, throttling, check, shunt or overflow unloading pressure.Valves for flow control, ranging from the simplest cut-off valve to the various valves used in extremely complex automatic control systems.

This type of silicone valve is used to prevent backflow of the medium and to use the kinetic energy of the fluid itself to turn on and off automatically when the reverse flow occurs.The outlet of the water pump, the outlet of the trap, and other places where the flow of the fluid is not allowed to flow.The check valves are divided into three types: swing, lifting and interlock.For swing check valves, the flow can only flow from left to right when the reverse flow is automatically closed.For the lift check valve, when the fluid flows from left to right, the valve core lifts, forming a path, and the valve core is pressed to the seat when the reverse flow is closed.For the wafer check valve, fluid flows from left to right, and the valve core is open, forming pathway, reverse flow when the valve core is pressed close to the seat and shut down, wafer check valves can be installed in several, small volume, light weight, compact structure.

A beverage with silicone valve cap, the cap has a bulge on the body of water mouth, blocked shots in his mouth, whose character is: the bottle mouth with seat, seat inlaid with silicone valve, silicone valve gasket for central cross mouth open, there is no external force, the mouth does not open, beverage bottle should not leaked out, and drink by means of the water the mouth suck bottle caps, cross suction mouth open open, drink sucked out.Using silicone valve structure, cap without sucking after opening, the liquid in the bottle will not flow, to prevent the bottles when motion state or lodging liquid leakage phenomenon, and also to prevent the outside dirt into the bottle, clean and convenient.