Some Questions About Silicone Rubber

The performance and reliability of Silicone rubber products are widely used in various industries, but they will also encounter many different problems. In order to facilitate customers to understand Silicone rubber products, Niceone-tech hopes that the following content can help customers.

What effect does silicone product spray oil or PU?

Silicone rubber keypads products have a smooth, flexible surface that feels great, while others don't. The main reason is that the former spray low temperature feels oil or PU, feel oil or PU as the name suggests is to enhance the feel, Which is the silicone products using low-temperature vulcanization technology.

Benefits of low-temperature feel oil or PU spraying:

1. silicone rubber products spray low-temperature feel oil has anti-static, easy to filter, strong adhesion, good wear resistance, low baking temperature, soft and delicate feel, paint film appearance flat, uniform surface fog and other advantages.

2. The surface of the silicone rubber product sprayed with hand oil is shiny, smooth and elastic. It feels good and has a good touch on the skin.

Spray low-temperature hand oil technology：

A. First, we need to clean the surface of the silicone products and keep the surface dry.

B. Add platinum water PL6 to the ink before ink usage, stir well, and dilute it by 6-7 times with white oil; When dilution, according to the principle of less and then more, white oil is added in stages; After dilution is finished, filter it with a 300-400 mesh cloth and then apply it to the machine or spray it by hand.

C. Finally, the silica gel will be placed in a dust-free environment for 3-8 minutes after vulcanization can be carried out!

Vulcanization temperature of various rubber materials

When molding silicone rubber products, if the vulcanization temperature is increased, the vulcanization time can be shortened and the vulcanization efficiency can also be effectively improved. Therefore, many vulcanisation molding practitioners in the early stage in order to accelerate the molding speed of silicone and rubber products will start on the increase in temperature. Sometimes it does shorten the curing time, but sometimes it's self-defeating, and instead of increasing productivity, there's a whole bunch of numbness and rupture. Why does this happen?

In fact, silicone, and rubber vulcanization temperature cannot indefinitely increase, because silicone and rubber are polymers, and high temperature can cause the rubber chain output cracking reaction, and crosslink rupture, resulting in " sulfide to return the original " phenomenon, resulting in a decline in the physical and mechanical properties of the silicone, rubber products, namely, we often say change and burst. According to the experience accumulated in the production process of some silicone rubber products, Niceone-tech suggests the vulcanization temperature of commonly used silicone and rubber as follows:

• Suggestions for vulcanization temperature of natural rubber (NR ): the most reasonable range: 140 ~ 150℃, the highest not exceeding 160℃;

• Vulcanization temperatures of butadiene rubber (BR ) , Isoprene Rubber (IR ) and neoprene rubber (CR ) are recommended: the most reasonable range: 150 ~ 160℃, the highest not exceeding 170℃;

• The vulcanization temperature of SBR and NBR is recommended: the vulcanization temperature can be over 150℃, but the highest is not more than 190℃.

• The vulcanization temperature of butyl rubber (IIR ) and ethylene-propylene-diene rubber (EPDM ) is recommended: the most reasonable range is 160 ~ 180℃, the highest is not more than 200℃; Thermal vulcanization temperature of silicon rubber (SR ) and fluorine rubber (FR ) is recommended: the most reasonable range is 170 ~ 180℃.

• If secondary vulcanization is needed, the secondary vulcanization temperature should be controlled at 200 ~ 230℃, and the time should be controlled within 4 ~ 24H according to the process requirements.

Summary of common quality problems of silicone products

Silicone rubber product is a kind of silicone products of silicone processing molding. Silicon rubber product has high-temperature resistance, easy cleaning, long service life, flexible, comfortable, environmental protection, non-toxic, and other characteristics, its application in our daily life is very extensive, common silicone products are silicone pacifiers, silicone tube, silicone cake mold, silicone kitchenware, silicone keys, silicone bracelet and silicone cases, but in the process of the actual use of silicone rubber products, some people will encounter all sorts of problems; Today, niceone-tech, a membrane keypad manufacturer, will introduce the causes and solutions of common quality problems in silicone products, hoping to help friends in and out of the industry.

1. Dark marks of silicone products

Causes: the moulding temperature of the silicone product exceeds the bearing range of the color paste, which will lead to water ripple after the silicone molding.

Solution: control the temperature within the tolerance range of the paste.

2. Silicone rubber keypad products turn yellow

Causes: When silicone products are used for a long time, the surrounding ring will turn yellow to silicone rubber keypad products.

Solution: add an anti-yellowing agent or use better silicone materials, such as food-grade silicone, liquid silicone and weather glue.

3. Silicone rubber keypad products absorb dust

Cause: Silicone rubber material contains silicone desiccants, which have a strong adsorption force on the dust in the surrounding air.

Solution: Through the production of silicone rubber keypad products in the dust-free workshop, silicone rubber keypads can reduce the contact with dust; Or the method of spraying hand oil on the surface of silicone rubber keypad products to reduce the adsorption of dust.

4. Silicone products produce oil

Causes: the mixing of silicone oil and white mineral oil in the silicone raw material leads to the conflict with white carbon black, resulting in oil production.

Solution: control the amount of silicone oil and mould release agent. Silicone oil of silica gel raw material will conflict with highly corrosive chemicals and need to use alkaline substances to increase the adhesion;

5. Moldy silicone products

Causes: some additives in silicone raw materials are the main factors leading to mildew, such as silicone oil, rubber powder, vulcanization agent, etc., they are the main nutrients to promote the growth of mold; Storage environment wet environment will promote the growth of mold silicone products.

Solution: the storage warehouse should be dry and ventilated, check whether there is any problem with the silica gel products regularly, and use alcohol or anti-mildew agent to deal with the moldy silica gel products.

6. The tension of silicone products is poor

Causes: The reason is that in order to shorten the molding time of silicone products, the membrane keypad manufacturers increase the product output by adjusting the pressure and temperature of the machine. On the one hand, a large number of defective products are likely to appear in the products, and on the other hand, the service life of the products will be shortened.

Solution: adjust the machine to suit the temperature of the molding mold of the silicone product, and extend the time of the hydraulic molding.

Due to the differences in equipment technology and experience of some silicone product manufacturers, the causes and solutions of the problems will be different. Please refer to the actual situation for details. As a powerful manufacturer with 8 years of experience in customing silicone rubber keypad, Niceone-tech has been adhering to the original intention of providing customers with high-quality products and services, providing corresponding solutions for customers' customized needs, one-stop customized services and follow-up order tracking feedback to ensure that customers can receive satisfactory goods in a timely manner. Welcome to visit our membrane keypad suppliers.