中文字幕乱码AV电影_国内AV免费在线观看_东京热精品无码免费资源视频_国模私拍精品一区二区

Recently very hot natural latex pillows, latex mattresses and a series of natural latex products. So there are a lot of products on the market are made of latex and rubber, and a lot of people are easy to confuse latex and rubber. So, do you really know anything about latex and rubber? What's the difference? How to correctly choose rubber products and latex products? Today xiaobian will give you a popular science!

1) What is rubber

Rubber refers to a high elastic polymer material with reversible deformation. It is elastic at room temperature and can produce a large deformation under a small external force. It can return to its original state after removing the external force. Rubber belongs to completely amorphous polymer, its glass transition temperature is low, the molecular weight is often large, more than hundreds of thousands. Rubber is divided into natural rubber and synthetic rubber. Natural rubber is made from rubber trees, rubber grass and other plants after extracting gum; Synthetic rubber is made by polymerization of various monomers. Rubber products are widely used in all aspects of industry or life.

2) What is latex

Latex is a colloidal emulsion formed by polymer particles dispersed in water. Usually the water dispersion system of rubber particles is called latex; The water dispersion system of resin particles is called emulsion. It can be directly used as surface coating, film and adhesive, etc. After processing, it can be made into raw rubber and latex products (such as sponge, glove, balloon, medical hose, etc.), which are widely used in daily life. Can be divided into natural latex, synthetic latex and artificial latex three categories.

3) Difference between latex and rubber

A. In terms of characteristics and performance

Characteristics of rubber:

1. High elasticity: low elastic modulus, large elongation deformation, recoverable deformation, and can maintain elasticity in a wide temperature range (-50~150℃);

2, viscoelastic: rubber material in deformation and recovery deformation by temperature and time, showing obvious stress relaxation and creep phenomenon, under the action of vibration and alternating stress, lag loss.

3, electrical insulation: such as metal corrosion, wood decay, rock weathering, rubber will also produce aging phenomenon because of the change of environmental conditions, so that the performance of deterioration, reduced life.

4, good wear resistance, high friction coefficient and acid and alkali corrosion resistance, some varieties such as nitrile rubber, fluorine rubber and other oil resistance.

Characteristics of natural latex:

1. Super elasticity

2. Orthopaedic function

3. Super permeability

4, durable and not easy to deformation

5, mildew and antibacterial

6, ultra quiet without static electricity and radiation

B. In terms of use

Application of rubber

1, widely used in tire industry, shoe industry, cloth industry and conveyor belt industry, etc.

2. Used for inner tube, leather bag, rubber paste paper, window frame rubber, steam hose, heat-resistant conveyor belt, etc.

3, widely used in environmental protection refrigerant, R134a system seals, car engine system seals.

4, high temperature water vapor environment seals or parts of sanitary equipment seals. A rubber part in a braking system. Seal in radiator (car water tank).

5, used for the production of fuel tank, lubricating oil tank and in the petroleum hydraulic oil, gasoline, water, silicone oil, two ester lubricating oil and other fluid medium used in rubber parts, especially sealing parts.

Application of latex

Mainly used for latex impregnation products :(weather, festival, toys) balloons, (medical, household, industrial) gloves, goalkeeper gloves, pacifiers, etc

Sponge products: sponge (mattress, pillow, shoe material bottom pad);

Molding products: latex toys, gas masks, cosmetics, shoes;

Molding products: rubber silk, medical supplies; Other applications :(wool, brown, animal and plant and artificial synthetic fiber, artificial leather) bonding, flocking, nonwoven fabric, carpet, textile, paper making, and adhesive, etc.

4) How to correctly choose latex products

1, reflective.

Reflective sex can see the technology of a latex product directly, reflective technology is not as good as reflective, without reflective quality is better for sure. But it is not reflective must add synthetic glue, reflective and process and mold hook.

2. Surface texture

The surface of latex products with good quality will have the texture like the skin of the old man, which is decided by the freshness of its original liquid and the process. The surface is smooth and cold and white, indicating that the permeability is very poor, and there is no air vent. The synthetic glue is added, so it will appear very "perfect".

3, smell

The taste of natural latex is rubber, like the usual doctor with the taste of medical gloves, rather than the pungent fragrance, is added to cover up the irritant toxic gas, to be alert to formaldehyde and other substances exceed the standard.

4. Elasticity and toughness

Natural rubber has a strong resilience, its toughness so that it will not be torn on the bad, durable, easy to tear on behalf of the rubber content is very low. But it does not mean that the glue that is not easy to tear is necessarily pure natural glue, but relatively speaking, it is not easy to tear better.

5) How to correctly choose rubber products

1, look at the material and technology

Look at the material: the material of rubber products with different uses is different. The image of the same rubber products is generally the clearer the better.

See craft: see rubber product surface whether burr edge, level off, smooth technology is helpful for the installation of rubber products, general consumer can use combustion law to see clearly the material of its rubber products.

2. Smell

The smell of good rubber materials is obviously different. Usually, the smell of good rubber products is not so big, but the smell of bad products is big and bad.

3. Ask where the rubber comes from

Detailed knowledge of rubber raw materials and origin, such as origin, characteristics and use, etc.

4. Weigh in

Under normal circumstances, the same material of rubber products, its weight is the same.