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Where is the towel rack more beautiful and practical?

The towel rack is an inconspicuous design in the bathroom, but it provides an improbable storage pendant function for the bathroom space, allowing the towel to have a safe place, and even keeping the towel dry and comfortable, providing a high-quality and relaxing quality of life. Nowadays, the design of the bathroom basically divides the shower area, the hand washing area, and the toilet area according to the "dry and wet separation". Many people will install the towel rack in the shower room, on the wall of the shower room. The advantage of installing it in the shower room is that you can turn around and get the towel when you take a bath, but there is also a drawback. The shower room is wet all the year round, so the towel will hardly dry out if you hang it in it. It is easy to breed bacteria and mites. Of towels will get moldy and even produce peculiar smell The bathtub is one of the important protagonists in the bathroom. Many families will install a bathtub in the bathroom, and the top of the bathtub is also a place where many people like to install a towel rack. It looks very beautiful, but in fact it will be very big when used Inconvenience, just imagine, usually outside the bathtub, if you want to get a towel, the bathtub becomes a "hurdle" that must be crossed. The area where the bathtub is installed is also a "wet area" at any rate. It will also make the towel damp. Over time, the towel will breed bacteria, mites, mildew, and even produce peculiar smells.
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20
2018-08

The United States has developed ultra-thin carbon nanotubes, foam products can be reduced in flammability, Sanmei has developed ultra-thin carbon nanotubes, foam products can be reduced in flammability, and Sanmei has developed ultra-thin carbon nanotubes

Time of issue: : 2018-08--20
According to a report by the physicist organization network on January 16, by adopting a unique sandwich structure at the nanometer scale, scientists at the National Institute of Standards and Technology (NIST) have developed a multi-walled carbon nanotube material that can greatly Reduce the flammability of foam products. Researchers said that the new technology is expected to reduce fires caused by soft decoration by a third. Related papers were published in the professional journal "Solid Film". This new technology, invented by the National Institute of Standards and Technology, combines multi-walled carbon nanotubes with two polymer materials like a sandwich, and superimposes this three-layer material into four consecutive layers. This kind of nanomaterial, which sounds quite "thick", can actually be described as "thin as a cicada wing"—its overall thickness is less than one-hundredth of the diameter of a human hair. In the early stages of the research, the material scientists Jin Yanxi (transliteration) and Rick Davis, who were in charge of the project, set three key goals for the new material: full coverage of the porous surface of the foam material, uniform distribution of nanotubes, and simple and easy-to-promote manufacturing methods. For this reason, they tested a variety of materials, hoping to improve the fire resistance and delay the spread of flame, but the performance was not ideal. In the test, they chose carbon nanotubes, but this material, which is made of carbon atoms like a cylindrical wire mesh, cannot be firmly attached to the surface of the foam. To solve this problem, they chose medical carbon nanotubes, which are often used to increase the viscosity of DNA molecules in cell culture. It is characterized by a layer of amino groups containing nitrogen molecules on the outside. This choice proved to be correct. Medical carbon nanotubes can be evenly distributed among the flame-retardant materials and firmly "grasp" the surface of the material in contact with it. In addition, this material makes full use of the rapid heat dissipation capability of carbon nanotubes. In addition, even if it encounters high temperatures, the carbon nanotubes in the coating are completely scorched, the scorched layer also has a stable flame-retardant structure, which can form a carbon protective layer to prevent the flame from continuing to spread. Davis said that compared with the brominated flame retardants that are currently commonly used in soft decoration, the new technology has better flame retardant effects. Compared with the untreated foam products covering the carbon nanotube flame retardant material, the flammability is reduced by 35%. If it can be widely promoted, the new technology is expected to reduce fires caused by soft decoration by one third. Whether in public places such as offices and hotels, or in our homes, foam decorations are used more and more frequently, and in many cases it is the culprit that caused the spread of fires. Statistics show that there are 6,700 fires caused by soft decoration in the United States each year, and 480 people are killed. In fact, people's current criticism of brominated flame retardants is not the flame retardant effect, but its toxicity. The new study points out that it has a complete victory in flame retardancy, but it does not explain the toxicity problem. If in this respect, it will undoubtedly become a fire protection "protective umbrella" for many beautiful buildings in the future. Of course, the application of flame retardants is far more than construction, national defense, military, aerospace... its stage is everywhere
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20
2018-08

Method for improving cold-cured high-resilience molded foam products

Time of issue: : 2018-08--20
1 Introduction Polyurethane cold-cured molded foam products are mainly used to produce car seats and headrests. Compared with hot molded products, they have simple processing technology, moderate mold temperature (45-70°C), and low energy consumption; and have excellent physical properties, Short mold time and high production efficiency. In 2012, it exceeded 19 million vehicles. The competition among the supporting auto interior companies has become increasingly fierce, and the cost of land rent, human resources, raw materials, and transportation has continued to rise, but it is difficult to absorb the increased cost in the product price. Faced with the difficulties of reality, companies can only gain space for continued survival and profitability through changes. The improvement of fast demoulding and high physical properties of the system material can greatly reduce labor costs, and can reasonably reduce the density of the product under the premise of ensuring the physical properties of the product, thereby generating new profit points. 2. Introduction For many years, TM20 (TDI/PAPI=80:20) and TM50 (TDI/PAPI= 50:50) and other TDI-rich mixed isocyanates for production, the advantages are: high TDI-rich NCO content, low P/I ratio can reduce the amount of black material, low cost; rich TDI-produced foam, Good elasticity, high tear strength, good fluidity of the system material, and relatively low product density. Disadvantages are that pure TDI is currently a highly toxic drug and is controlled by the Ministry of Public Security; TDI has a certain impact on the health of on-site operators; system materials rich in TDI mature slowly, which affects production efficiency; foams produced by rich TDI are soft. Due to the low price of TDI in recent years, from the perspective of cost, isocyanates rich in TDI are very cost-effective, and from the perspective of operator health, it is necessary to reduce the amount of TDI. The TM50 system is a relatively moderate ratio: the physical properties and cost are moderate, and the purchase is more convenient. However, it is still necessary to solve the problem of slow efficiency caused by slow maturation, insufficient foam with high physical properties, and slightly higher density. Generally speaking, slow maturation can be solved by adding foaming catalyst A1 and gel catalyst A33, but increasing the amount of A33 will cause the foam gel speed to be too fast, and it is easy to produce too late to close the mold or product flow dissatisfaction, missing corners, Undesirable phenomena such as voids can easily cause shrinkage and flatulence of the product, which will affect the performance of the foam. The physical properties of foam are generally set by OEMs. In recent years, OEMs have been continuously improving their physical properties. The most common physical properties such as tear strength must not be less than 2.0 N/cm, and those with high requirements must be greater than 2.3-2.5 N/cm; The tensile strength should not be less than 90Kpa, and the high requirements should be greater than 100-120Kpa. The compression set is increased from less than 10% to less than 5%. Under the condition that the isocyanate is relatively fixed, it is necessary to conduct research from the combined polyether component, and select the appropriate polyether, polymer polyol and crosslinking agent, silicone oil, catalyst, etc. The density is generally set by the OEM, but the general OEM will give a certain range. For example, some OEMs require a seat of 45±5Kg/m3. If the density range of 40-42 can meet the performance requirements of the OEM, This can also reduce costs. Generally reducing density is achieved by adding water. Water is a chemical blowing agent, which generates CO2 by reacting with isocyanate to generate gas, thereby reducing the density of the product. However, if there is too much water, the water-isocyanate reaction (blowing reaction) in the system will be greater than the polyol-isocyanate reaction (gel reaction), resulting in peeling, hollow center, and even bubble collapse. Therefore, when choosing a relatively fixed isocyanate system, another main raw material is polyether and polymer polyol. Fixing a polyether system is beneficial to cost control. Taking into account the basic performance requirements and cost factors of the current OEMs, polyether polyols can choose from 4800 molecular weight to 6000 molecular weight, polymer polyols can choose 3628 (28% solid content), H45 (43% solid content) and other common commonly used Types, domestic manufacturers such as Shanghai Gaoqiao, Tianjin San Petrochemical, Jinpu Kumho, Zhongshan Petrochemical, Shandong Dongda, etc. Setting such standard polyether products is easy to purchase, price is transparent, the supply chain is smooth, and the entire cost is easier to control. Under the choice of a fixed isocyanate and polyether system (330N to POP ratio), it is necessary to improve physical properties and process performance, mai
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20
2018-08

Developer response: the use of foam meets national standards

Time of issue: : 2018-08--20
News from this newspaper (trainee reporter Zhou Song) The 13th edition of this newspaper published on October 25, "Relevant departments: whether foam as a building material meets national standards for fire protection remains to be tested", reporting that the third phase of the university city Xi Street construction site uses foam as a building Building materials, citizens are suspicious. Recently, Chongqing Kaixilai Industrial Co., Ltd., the developer of the site, contacted this newspaper and provided it with the inspection report of the cast-in-place concrete hollow floor issued by the Municipal Fire Product Quality Supervision and Inspection Station. The report determined that the floor was in line with the state Fire resistance limit standard. The reporter saw in the inspection report that the samples submitted for inspection were sampled by the Shapingba District Fire Fighting Detachment on September 29 at the Xijie Street Phase III construction site in University Town and sealed up, and delivered to the Municipal Fire Product Quality Supervision and Inspection Station on October 22. The report inspection results show that the fire resistance limit of the sample reaches 90 minutes, and the fire resistance and heat insulation and fire integrity are in line with national standards. Chen Huaping, the engineering director of the project, told reporters that the current national technical standard for "Cemented Hollow Concrete Hollow Structure Forming Core Formwork" (JG/T352-2012) was formally implemented on May 1, 2012. In popular terms, the technology is to pre-embed a shaped polystyrene foam product with fireproof performance up to the design requirements in the cast-in-place concrete floor, and then pour the concrete to form the floor structure. Chen Huaping introduced that the use of this technology can reduce the weight of the building structure, increase the span of the building slab, and increase the net height of the room. Compared with ordinary cast-in-situ floor slabs, this technology also has better sound insulation and heat preservation effects.
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