Foam Rubber Sheet Has Excellent Wear Resistance
Foam Rubber Sheet Polyurethane prepolymer can be used for the recycling of used rubber. Recycled old tires and other waste rubber products by crushing (such as the freezing method), the powder, granules and fiber fragments can be bonded with adhesive to make composite materials. The rubber particles are usually bonded with polyurethane adhesive to obtain elastic material, mainly used for sports and entertainment places, kindergarten plastic paving materials, floor tiles, etc., especially the sports field, the school playground non-slip elastic pavement materials, the general use of polyurethane The main material, rubber particles as auxiliary materials, because the polyurethane has excellent wear resistance, has been widely used in foreign countries,Foam Rubber Sheet the domestic development is also very fast. Waste rubber tires in the crushed fiber particles can be sieved with foam polyurethane adhesive bonding, made of sound insulation, heat insulation and other materials.
1. Pavement material
For the sports field, playground, entertainment, indoor ground polyurethane plastic pavement material has a comfortable, wear-resistant, anti-skid, waterproof, etc., the plastic outdoor sports field can not be affected by the rain, improve athletes, opportunity. Pavement materials are all plastic type (mainly made of polyurethane, without rubber particles), mixed type, double type, folding type and so on, and mixed type mostly. Mixed with waste rubber particles for the urethane rubber layer, the thickness of about 10 coke, the surface of rubber particles as a non-slip friction layer, laying process flow chart. The double layer type is the polyurethane layer and the lower layer is the rubber layer of the rubber layer. The folding type is a rubber sheet which is easy to carry. One kind of rubber sheet is made of 1 part of waste tire rubber, polytetrahydrofuran type polyurethane prepolymer 1 part, MOCA 0.1 part after mixing into the mold after curing from. Among these pavement materials, the NCO-containing polyurethane prepolymer or a two-component liquid system with a crosslinking agent is a binder for waste rubber particles. Polyurethane prepolymer is generally made of polyoxypropylene glycol or triol with excess mI or MDI and other raw materials,Foam Rubber Sheet NCO content of about 10%. Adhesive to polyurethane adhesive as the main component. The amount of binder is 1/4 to 4 times that of rubber particles. At present the domestic stadium plastic pavement material in the amount of adhesive is about 4 times the amount of waste rubber particles, less binder with paving materials, can be used for kindergarten corridor ground, playground, in the soft plastic floor, easy to fall.
A floor tile consists of a lower concrete / middle layer of elastic foam layer / surface layer (polyurethane adhesive bonded granular waste rubber), the floor material wear, weather, can be used for playground, swimming pool and patio and other ground laying.
A rub pad consists of rubber particles (-25mm) 83% and 17% polyurethane adhesive composition. Wherein the polyurethane adhesive is a two-component, the main agent is a PPG-MDI prepolymer (the molar ratio of MDI to PPG is 2: 1), the curing crosslinking agent is a mixture of triethanolamine and polyoxypropylene triol L / 2), the mass ratio of the main agent to the crosslinking agent was 90: 7.5, molded at 80 ° C under 3 MPa pressure and aged at room temperature, with a tensile strength of 3.1 MPa.
3. Soundproof material
According to several patents, the waste tire fiber and polyurethane adhesive mixture, the foam curing, can be made of sound insulation composite materials. Such as Japan's Nitto Tire Company reported 100 parts of waste tire fiber (0.1-20mm), PPG I0 part, TDI 5 parts, water 0.5 part, stir in the mixer for 2min, at 150 ℃, 1MPa for 10min, 10mm thick, The density of 0.3g / cm3 sheet can be used for sound insulation layer. The addition of an inorganic filler such as iron oxide powder to the above system can also be used for sound insulation by hot-press molding a plate having a density of 1.8 g / cm3.
Bubble of foam
Production of polyurethane soft foam,Foam Rubber Sheet often produce some foam cutting the scrap and unqualified waste foam, and even old cars and other waste recycling also have a considerable amount of waste foam to be treated. Incineration will produce toxic gases that pollute the environment and are generally not used. There are many ways to recycle waste foam, such as alcohol-based renewable polyols for the manufacture of polyurethane foam. But the most direct re-use method is to crush the foam with a foam-type adhesive bonding, molding, making mat or noise, insulation materials.
Recycled waste foams used for bonding should be machined into smaller pieces by crusher, and the size of the foam should be as stable as possible, and their size has an effect on the performance of the finished product. Using the same adhesive, the soft foam, the smaller the debris,Foam Rubber Sheet made of the material more hard, and more uniform. The hard foam is usually brittle and easy to break than the soft foam.
The polyurethane adhesive used for the foamed binder bond may be an end NCO-based prepolymer made of a polyether polyol, an excess of TDI or PAPI, or a two-component polyurethane composition, or a field-ready A mixture of raw materials. Waste polyurethane foam used in the adhesive is generally polyether polyol and TDI system, hard foam adhesive is suitable for MDI type polyisocyanate system. The amount of binder used depends on the performance requirements of the product,Foam Rubber Sheet usually between 5% and 50%, 10% -25% common. The binder can be mixed directly with the foam fraction or sprayed onto the foam debris (if necessary, the binder may contain a solvent to reduce the viscosity and control the amount of binder solids). It is generally necessary to mix the binder and the scrap with a stirrer (so that the binder is adhered to the scrap). The foam containing the binder is put into the mold by heating, pressing and molding.