Technical Forum_Ningxia Lingshi New Materials Technology Co., Ltd

Material Properties of Rigid Polyurethane Foam

Rigid polyurethane foam (SPF) is a kind of polymer synthetic material with numerous tiny closed cell structures, which is a new type of material integrating waterproof, thermal insulation and heat insulation. Under the action of modifiers, foaming agents, catalysts, flame retardants, foam stabilizers, anti-aging agents and other additives, through the uniform mixing of special equipment, thermal reaction occurs in a certain state, instant atomization, resulting in a rigid foam compound with a closed cell rate of not less than 95%, which has ideal water impermeability and good water vapor permeability resistance. It is widely used in high-rise residential buildings, hotels, cold storage, warehouses and other large building roofs. Its main features are shown below. 1.1 polyurethane rigid foam with reliable waterproof function has a continuous and dense skin and a high-strength honeycomb structure with an interconnected wall with a closed cell rate of more than 95%, ideal water impermeability and good water vapor permeation resistance, and a water absorption rate of ≤ 1%. Using on-site direct spraying technology, a complete continuous impermeable layer can be formed on the roof of the building, thus fundamentally eliminating the possibility of water infiltration along the gap. In addition, the bond with the base layer is firm, the bond strength can exceed the tear strength of the foam itself, will not be separated from the base layer, to avoid water leakage along the layer. 1.2 thermal insulation and high energy-saving efficiency polyurethane rigid foam is a dense structure, closed non-connected pores, its rigid foam micropores are closed with foaming agent gas with extremely low thermal conductivity, which has almost no influence on convection, so the thermal conductivity is lower than 0.022W/(m • k), far lower than the traditional thermal insulation materials, with good thermal insulation performance and obvious energy-saving effect. 1.3 strong bonding performance of the material has excellent bonding performance, the concrete, metal, masonry, wood, glass, fiber and other base surface has a strong bonding strength, bonding strength should be ≥ 100kPa, the bond strength of concrete and masonry can be as high as 240kPa, as the roof waterproof insulation layer has strong wind resistance. 1.4 Chemical resistance strong polyurethane rigid foam in benzene, gasoline and other general solvents and dilute concentrations of acid, alkali, salt solution and other environmental effects have good chemical stability, will not occur mildew and decay. 1.5 strength depends on its raw materials, formula, density, structure and molding process. When other factors are relatively unchanged, the density determines the strength. When the density of SPF hard foam is> 55 ㎏/m3, its compressive strength can be ≥ 300kPa, and its tensile strength can be ≥ 500kPa, which has good impact resistance. 1.6 high quality environmental protection product SPF bubble in the use of no harmful substances volatile, does not pollute the surrounding environment, its chemical properties are stable, has good corrosion resistance, does not decompose, not mildew. 1.7 good temperature resistance and fire resistance SPF bubble has a volume shrinkage rate of less than 1% at a low temperature of -50 ℃, and will not become brittle and crack. Under the condition of 120 ℃, there is no obvious change in volume and strength. At a higher temperature of 150 ℃, the polymer will not degrade, so it can be used at high temperature. It does not have the phenomenon of melting and dripping like EPS or XPS materials, and the rigid foam polyurethane material will form a coking protective layer during the combustion process to inhibit the spread of combustion. High 1.8 elongation at break After modification, the elongation of the sprayed polyurethane rigid foam is as high as 13%, which successfully overcomes the fracture phenomenon of the waterproof insulation layer caused by the uneven settlement of the foundation and the change of environmental temperature difference. The 1.9 is easy to construct, the construction period is short, the SPF foam waterproof insulation layer can be sprayed on site, the operation is convenient, the one-time molding is convenient, and the construction is fast. The curing speed of the material is very fast, and the person can be applied 20min after spraying, which simplifies the overall construction process and shortens the construction period.

2023

Dibutyltin dilaurate is used in which products

Dibutyltin dilaurate abbreviated DBTDL product description: dibutyltin dilaurate catalyst abbreviated DBTDL. It is a kind of high boiling point multi-purpose organotin catalyst after special liquefaction treatment,

2023

Introduction of classification and use of polyurethane

The application fields of polyurethane include the following points: 1. Clothing and sports goods 2. Household goods 3. Electronic products 4. Medical machinery 5. Vehicles and other transportation tools 6. Building civil engineering 7. Industrial materials

2023

Development direction of new products in polyurethane field

When everyone is confident that China's polyurethane industry has entered a stage of rapid development, we should pay more attention to the future development direction of polyurethane, where the technology accepts the most difficult innovation challenges, and where the benefits are maximized.

2023

Difference between T9 stannous octoate and T12 dibutyl tin dilaurate

Used as a catalyst for polyurethane synthesis and room temperature vulcanized silicone rubber. Also used as epoxy resin catalyst type curing agent, in the curing of stannous octoate than dibutyl tin dilaurate catalytic activity, if the two compound use, the effect is better than the use of separate, can take into account the reaction speed and curing speed. Because the divalent tin compounds are easily oxidized and decomposed by oxygen and water vapor in the air, they must be sealed for nitrogen protection during storage to avoid high temperature and excessive humidity to prevent activity decline or failure. T9 stannous octoate use: stannous octoate catalyst is polyurethane foam, especially the important catalyst in the production of polyurethane flexible foam. T9 stannous octoate, T12 dibutyltin dilaurate Details Parameters Product Details

2023

Polyurethane catalysts in multi-domain solutions

The T-12 (dibutyltin dilaurate) produced by the new materials is an organotin compound with a high boiling point. It is used as an efficient catalyst in the manufacture of polyurethane coatings, electroplating coatings, spraying, polyurethane foams, coatings, adhesives and sealants. Organic silicone rubber mold products, soft PVC plastic products, such as film, semi-rigid sheet, transparent hose and other production of heat stabilizer use. T-12 can be dissolved in all plasticizers, benzene, toluene, acetone and other organic solvents, insoluble in water, is a powerful catalyst. In addition, the T-12 catalyst produced by the new material is used in the manufacture of rigid foam polyurethane. Organometallic materials such as T-12 catalysts can produce a synergistic effect of increased activity with amino catalysts in applications where the use of amino catalysts alone exhibits insufficient catalytic action. It is therefore suitable for the production of rigid foams requiring high-speed catalysis. Even high-density structural foams, sprayed wall insulation and rigid plates are manufactured in high-speed production lines. The T-12 has a fast and efficient drying reaction in the time of rapid gel debonding. T-12 can be applied to one-component moisture-cured polyurethane coatings, two-component coatings, adhesives and sealing layers. Polyurethane drier for polyurethane rigid foam, semi-rigid foam, soft foam, high resilience foam, elastomers, sealants and other industries. The catalysts commonly used in the synthesis of polyurethane and its raw materials are mainly tertiary amine catalysts and organometallic compounds.

2023

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