A complete knowledge of sole types, advantages and disadvantages
1. Polyurethane bottom (PU):
Polyurethane is the abbreviation of polyurethane. Its English name is polyurethane. It is a kind of high polymer material, which is made of a / B / C polyester foam. It is divided into oil and water. It is a new organic polymer material, known as the "fifth largest plastic", which is mainly used to manufacture high-grade leather shoes, sports shoes, tourist shoes, etc.
Advantages: low density, soft texture, good elasticity, comfortable and light to wear; good oxidation resistance, excellent wear resistance, flexural resistance, high hardness; excellent shock absorption and anti-skid performance; good temperature resistance; good chemical resistance; corrosion resistance is beneficial to environmental protection, not easy to wrinkle.
Disadvantages: strong water absorption, yellowing, fracture, poor elongation, water resistance, rotten bottom, poor air permeability.
2. Leather sole:
Leather sole is a kind of sole that can breathe automatically and drive the foot to breathe. It has good air permeability and can release the absorbed sweat to keep the foot dry. Real leather sole is mainly made of cow leather, with high price. The utility model has the advantages of easy setting, unchanging type, fit foot, good elasticity, can reduce impact but not easy fatigue, ventilate, absorb moisture, etc., at the same time, it is easy to process, and the type is easy to show aesthetic feeling. The texture is hard and not easy to be pierced, but it is easy to warp, deform or rot after being soaked in water or oil.
Its main features:
① Good thermal insulation to ensure proper temperature of feet in shoes
② The weight is light, 0.95-1.05 grams per square centimeter, just the same as the density of water. It can be waterproof and release moisture when the shoes are no longer wet, ensuring that the shoes are in a comfortable state.
③ Unique three-dimensional fiber structure, the sole does not break when bent 180 degrees. It can adapt to the shape of the foot quickly, support the impact of the ground effectively, and protect the foot more effectively than the sole of other materials with the same thickness.
3. EVA bottom:
Ethylene vinylacetate vinyl acetate copolymer, high molecular material. Commonly used in jogging, jogging, casual shoes, foot training shoes. Light weight, easy to process, not wear-resistant, not oil resistant.
Advantages: light, good elasticity, good flexibility, not easy to wrinkle, with excellent coloring, suitable for all kinds of climate.
Disadvantages: easy to absorb water, not easy to corrode, unfavorable to environmental protection, easy to dirty.
4. MD bottom:
Model or Phylon is a general term for EVA secondary high-pressure molding products. MD sole must contain EVA, MD sole is also called Phylon sole. For example, MD = EVA + RB or EVA + Rb + TPR, and some shoes are Rb + Pu, etc.
Advantages: light, elastic, fine appearance, good softness; easy to clean; good hardness, density, tension, tear, elongation.
Disadvantages: it is not easy to corrode, unfavorable to environmental protection, easy to wrinkle and shrink at high temperature; it has poor durability, and its shock absorption force will be reduced and its air permeability will be poor as soon as it is used for a long time.
5. Rubber bottom (RB):
RB is the abbreviation of rubber. It is made of natural rubber and recycled rubber. Heavy quality, oil-resistant, the bottom of the mold must be rough on the mating surface, easy to shorten after heating, the color is not the same.
Advantages: good wear resistance, antiskid, elastic, not easy to break, good softness, good ductility, stable shrinkage, good hardness, good bending, waterproof.
Disadvantages: heavy, easy to defrost (quality problem), not easy to corrode (environmental protection problem); not hard, easy to be penetrated; poor air permeability and moisture absorption, afraid of oil immersion, not suitable to wear in the car gas station and other places contacting oil.
* rubber foaming
The weight is lighter than that of rubber sole, with rubber smell. When using fingers on time, the surface rebound is more obvious than that of ordinary sole, with poor wear resistance.
High pressure polyethylene rubber bottom
Sole with high pressure polyethylene and rubber flavor, rubber and plastic are used together.
Raw rubber base: heavy, expensive, oil and heat resistant. Variable color.
6. TPU bottom:
Thermoplastic polyurethane is a kind of new environmental protection material, which is a linear polymer material produced by the reaction of diisocyanate, macromolecular polyol and chain extender.
Advantages: it has excellent mechanical strength, wear resistance, oil resistance and flex resistance, especially the most outstanding wear resistance, good appearance, generous and high-grade.
Disadvantages: poor heat resistance, hot water resistance, compression resistance, yellowing appearance, easy to stick mold in processing, hard, heavy, poor air permeability.
7. PVC bottom (imitation leather):
PVC polyvinylchloride, the natural color is yellowish translucent, glossy. There will be albinism in the flexure.
Advantages: most of them are cheap, oil resistant, wear-resistant and have good insulation.
Disadvantages: poor skid resistance, poor texture, cold resistance, folding resistance, poor air permeability.
8. TPR bottom:
TPR is a general term originally, including TPV, SEBS, SBS, TPO, TPU, EVA and other products. TPR sole mainly refers to the common name of SBS modified shoe material (belonging to the application of TPR material). TPR shoe material is a new type of high polymer shoe material mainly produced by thermoplastic SBS. It has the properties of rubber and can be processed and recycled according to thermoplastic. It can be made into rubber products by injection molding, extrusion molding and blow molding with ordinary plastic forming machine. After hot melting, TPR particles were injected into the mold, and the molecules moved with emission during molding.
Advantages: easy to shape, low price; light, comfortable, high elasticity, easy to stain, good ventilation, high strength, especially excellent low temperature resistance, high friction coefficient, strong grip.
Disadvantages: heavy material, poor abrasion (not wear-resistant), poor softness, poor bending (not folding), poor shock absorption, poor air permeability.
9. Raw rubber base:
Raw rubber is the general designation of unplasticized and mixed rubber, which is the most fundamental raw material for rubber production, including natural rubber and synthetic rubber. The raw rubber soles we usually call wear-resistant. The raw rubber soles here are actually cooked rubber soles. They are processed raw rubber. They just look like raw rubber. It's a mistake we made by convention.
Raw rubber has poor plastic building effect, low hardness, low density, easy to wear and break; the properties of cooked rubber are just the opposite, with good wear resistance and toughness. Mature rubber is widely used, such as automobile tires; raw rubber is only used to make low-grade household products, such as slippers.
10. PC bottom:
Polycarbonate (PC) resin is a kind of thermoplastic engineering plastics with excellent performance. It has outstanding impact resistance, good creep resistance, dimensional stability, heat resistance, low water absorption, non-toxic and excellent dielectric properties. It is the only product with good transparency among the five engineering plastics, and also the general engineering plastics with the fastest growth rate in recent years.
The PC bottom has the characteristics of good weather resistance, beautiful appearance, impact resistance, high light transmittance and strong plasticity.
11. Tr bottom:
TR sole material is a new product improved on the basis of TPR. It is a synthetic material of TPE and rubber. The product has more excellent performance. During the hot injection molding, the molecules move in a rolling ball. The utility model has the characteristics of multiple appearance patterns, good hand feeling, bright color, high smoothness, high technical content, and can be 100% recycled, belonging to the environmental protection sole material.
12. Imitation leather bottom:
It is a kind of typical rubber and plastic material with high elasticity. The main component is rubber as the base material, adding 10% - 30% high styrene, which imitates the performance of leather. The appearance is similar to that of natural sole leather, with grain pattern. The product is light and clear; it is light and comfortable when wearing, without noise, antiskid and wear resistance. Such sole has good elasticity, high hardness and rigidity, and its performance is similar to that of natural leather. Although it does not have the permeability and hygroscopicity of natural leather, it also has the advantage of not afraid of water.
13.BPU：
It is a new modified polyurethane (PU), which has the advantages of environmental protection, low density (ultra light weight), thick surface crust (smooth surface), good toughness, not easy to break, good weather resistance, etc. It can replace EVA big bottom, EVA waterproof platform, blowing PVC bottom platform, wooden shoes, PVC foam bottom platform, etc.
This modified polyurethane wood like material is very light, with beautiful wood grain, temperature resistance, and adjustable degradation period. It is a new green material.
14. Tendon (Tianjin) bottom:
Thermoplast bottom, a kind of light yellow and translucent sole, is named for its color and character similar to cattle's tendon. " The term "tendon bottom" is used to describe that it is as strong as the tendon, but the tendon bottom is manufactured manually, also known as thermoplastic elastic rubber bottom. (it started with rubber cowribs. At that time, it was mainly used to make sandals and then connect this color with other materials, which was generally called cowribs color. It can be said that the tendon first refers to natural rubber, and then evolved into the name of color card.)
The rib bottom can be made of rubber or plastic, and thermoplastic rubber (TPR) is the most convenient. This kind of sole has beautiful appearance, good elasticity and wear resistance. It is comfortable to wear and silent to walk. It is a good sole material for tourist shoes and daily life shoes.
Rubber tendon: for a long time, there will be a layer of mist like secretion on the whitened surface; cut a little with a blade and ignite it with fire to form black ash and leave a little white solid, which is difficult to drip when burning, and there will be a little black smoke in the stink of rubber. (with the development of current technology, some rubber cow gluten like secretions may not appear.)
TPR tendon: cut it with a knife and ignite it with a fire. When burning, there are black smoke mixed with a little gray green. There is a kind of dripping phenomenon. There is a bad smell of rubber. The burning time is a little faster than that of rubber tendon, and a little black burnt solid remains.
15. Midea:
In fact, meinaidi (also known as laiban, leduobang and rubber imitation leather sole) is also a rubber sole, only with different processing methods. It's cheaper than Midea.
The main component of Meinai base is rubber, with fine texture, wear resistance and tortuosity resistance. Is infinite extension, general width in 1 meter, from rolling out of the press cut into 2 meters long. It must be cut with a punching knife and then polished and colored. The thickness is generally between 3-5mm, depending on the demand.
16. ABS bottom:
Acrylonitrilebutadiene styrene, acrylonitrile butadiene styrene copolymer.
ABS engineering plastics are generally opaque, light toothlike in appearance, nontoxic and tasteless, with the characteristics of toughness, hardness and rigidity. The combustion is slow, the flame is yellow, and there is black smoke. After combustion, the plastics soften and burn, giving out a special smell of cinnamon, but without melting and dropping.
It has excellent comprehensive performance, excellent impact strength, good dimensional stability, electrical performance, wear resistance, chemical resistance, dyeability, and good molding and machining. Disadvantages: low thermal deformation temperature, flammability and poor weather resistance.
17. PE bottom:
PE plastic (polyethylene), English Name: Polyethylen. Good corrosion resistance, electrical insulation (especially high frequency insulation), high rigidity, hardness and strength, small water absorption, good electrical performance and radiation resistance.
PE bottom has good softness, elongation, impact strength and permeability, and good fatigue, wear and corrosion resistance.
18. SBR bottom:
Styrene butadiene rubber (SBR) is a kind of polymer elastomer material, which is synthesized by copolymerization with butadiene and styrene as the main monomers. Its quality is uniform and pure, with less impurities. Soluble in benzene, toluene, gasoline, chloroform and other organic solvents. The unsaturated double bond in SBR molecules and curing agent form a cross-linked network structure through substitution or addition reaction. The SBR vulcanizate reinforced by reinforcing agent has higher physical and mechanical properties.
The vulcanization speed of SBR is slow, but the vulcanization flatness is good, it is not easy to over vulcanize, and it has excellent properties such as aging resistance, heat resistance and wear resistance.
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