Raw materials and market trends of the hottest rot

2022-07-31
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Raw materials and market trends of rotational molding

development and scope of application of rotational molding industry

rotational molding or rotomolding, also known as rotational modeling (RM), rotational molding, rotational molding, etc., is considered to be a special molding method for hollow molding products such as large barrels and cans. The rotational molding industry is relatively young, and it was first started in the late 1950s with PVC paste plastic rotational molding, At present, there are a considerable number of rotational molding processing plants in the world, and their equipment and processes are becoming more and more perfect. It is a small branch of the plastic industry that has entered almost all application fields, but it is a new industry full of vitality and the growth rate of demand is higher than the overall average growth rate of the plastic industry. It is generally used to form hollow products with complex shapes that cannot be formed by other plastic processing and forming methods. It has a large degree of design freedom and no fusion joints. It can form large-scale products, including simple storage tanks to advanced and high-grade automotive, medical and aerospace components. The final product specifications can be as small as the head of a children's toy to an oversized storage tank with a capacity of up to 22000 gallons (80000l)

rotational plastic products from household containers to industrial containers; From small spherical vessels to automobile plastic parts to huge engineering plastic products, especially super large, non-standard and special-shaped hollow plastic products, such as barrels and cans of highly corrosive materials; Chemical containers for packaging, shells of other industrial transport facilities, softening water tanks and transport boxes; Child toy parts; Digital display; Sports facilities such as golf cart, football, playground and sports competition; safety hat; Vacuum cleaner, dust collector and weeder housing; Traffic barrier; Display cover; Hull, etc

however, compared with other plastics processing, the rotational molding industry is still in the development stage. Its simple production process and the relatively low end of the end market usually lead people to pay less attention to it. Now the development trend of the plastic market often requires the production of integrated parts, shortening the forming cycle and reducing processing steps, as well as the production of products with small total quantity and complex shape. In this way, rotational molding has gradually attracted people's attention. What is important is that this market view has attracted the attention of large resin manufacturers, and strengthened the development of resin brands for easy forming rotational molding, which is the key factor to drive the further development of rotational molding industry in the future

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resin and mixture for rotational molding requirements for rotational molding raw materials

in order to meet the performance of rotational molding process and processed products, raw materials must meet the following performance requirements: thermal stability, good melt fluidity, certain impact strength, high resistance to environmental stress cracking (ESCR), good comprehensive mechanical properties and good heat transfer. In order to ensure smooth rotational molding, meet the mechanical strength required by product application and have good appearance, ESCR is a very important indicator and one of the key indicators of long-term durability of products. Taking the polyethylene roll plastic with the largest consumption as an example, ESCR should generally be greater than 1000h. Obviously, the resin fluidity is the performance index and pass for the smooth processing of rotational molding. Only when the resin fluidity is good can the large and complex final products and components be formed, and it is also an important factor affecting the surface quality of finished products. Taking polyethylene, the most commonly used in industry, as an example, the general MFR (melt flow rate) range is 2~8g/10min (2.16 kg, 190 ℃)

in order to facilitate heat transfer and rapid melting, most of the rotational molding resins and mixing materials are powder materials with particle size of 35 mesh (74~2000um). The other state of the rotational molding raw materials is liquid. Some high fluidity resins, such as nylon, need to use small particles during molding

polyethylene is the most important rotational molding resin

among all polymers suitable for plastic processing, the varieties that meet the requirements of rotational molding are limited, for the following two main reasons: (1) many engineering plastics or resins with good mechanical properties can no longer be reshaped into uniform solids without pressure during rotational molding after being ground into powder with good fluidity; (2) Compared with polyethylene as the benchmark material of rotational molding, some other special raw materials are often expensive at first, and the market demand is small, which inhibits and hinders the manufacturers' enthusiasm for further development

polyethylene (PE) is the most important rotational molding resin in the world and its dosage is absolutely dominant. According to the dosage, the order of rotational molding resin is: Polyethylene (LDPE, LLDPE, HDPE, XLPE, mLLDPE, EVA) 95%; PVC 3%; Nylon (nylon 6, nylon 66, nylon 11, nylon 12) < 0.5%; Polypropylene < 0.5%; Polycarbonate < 0.2%; Fluoropolymer (ETFE, ECTFE, PFA, MFA, PVDF) < 0.1%

in addition, there are some polymers that have been successfully roll molded in recent 30 years and a small number of polymers used for special applications: polyformaldehyde, acrylic resin, styrene/butadiene/acrylonitrile copolymer (ABS), cellulose resin, epoxy resin, ionic polymer, phenolic aldehyde resin, polybutene, polyester, polyester elastomer, polystyrene, impact polystyrene, polyurethane, silicone polymer

polyethylene has the comprehensive advantages of easy rotational molding, good thermal stability and low cost, so it has been dominating and controlling the market of rotational molding products. Among them, linear low density polyethylene (LLDPE) has the largest demand. This - olefin polyethylene copolymer has high ESCR, wide adjustable range of density and other properties, many manufacturers, and has the advantage of low production cost compared with other PE. In particular, the recent use of single center catalyst for polymerization is conducive to the further development and introduction of products suitable for rotational molding The grade of polyethylene (metallocene polyethylene, MPE) with excellent comprehensive properties, such as easy processing, high rigidity, low viscosity of zero shear melt and short molding time (cycle), provides new possibilities and opportunities for the development of rotational molding industry

future market forecast

there is no specific report on the overall future development and growth of the world rotational molding industry. In 2006, AMI consulting company predicted that the average growth rate of the European rotational molding industry in the next few years would be 4.1%. According to new information, although the European rotational molding industry faced the pressure and challenge of market globalization and rising raw material prices affecting economic benefits in 2006, in fact, the rotational molding industry still achieved good performance, an increase of about 10% over the previous year. Many rotational molding processing plants are installing new equipment to improve the quality of rotational molding products and reduce costs through the use of advanced process control systems. The existing and new applications of rotational plastic parts in automobiles continue to grow strongly. The recovery of the construction industry drives the demand for construction, motor vehicles and equipment. The demand for equipment shells, motor vehicle functional parts and fuel tanks increases by an average of 10%~15% a year. The application growth rate in appliances and instruments is faster, with an annual growth rate of 15%~18%

at the ARMA held in Berlin in September, 2006, gent proposed that the shrinkage characteristics of various plastics were divided into four groups, and many future development opportunities and application fields of rotational molding products were listed, the representative ones were water storage tanks, wastewater treatment facilities, rainsheds, food production and transportation related components. In addition, the replacement of wooden pallets is also considered to be a new and important application field. The recyclability of rotational molding products is good, so the rotational molding industry is a green industry and has no worries about development

most industrial product applications are divided into initial entry stage, growth stage, maturity stage and recession stage. Figure 1 takes the storage barrel with the largest consumption of rotational plastic products and the rotational plastic industrial application considered as the main development direction in the future as an example to see the future prospects and trends of rotational plastic in various regions of the world. The tank applications in North America and Western Europe are close to maturity, while those in Australia Countries and regions such as Africa and Asia are in the growth stage or just entering the growth stage. As for the industrial application parts of rotational molding, North America and Western Europe have just entered the growth period, while other regions such as Asia are in the initial stage. Analysts believe that there is a large market growth and development space for rotational molding products in the clean drinking water storage tank system in the future# On the whole, the markets in the United States, Europe and Australia are relatively mature, but new products and technologies still bring new growth opportunities to the rotational molding industry. The high quality of new equipment products and fast production speed still stimulate investment in new production lines, and the processing and production are transferred to low-cost countries. Developing countries are mainly low-end products such as water tanks and storage tanks, and their development speed and grade are restricted by the overall level of industrial foundation. China is developing rapidly, and India, Malaysia, Thailand, Vietnam and other Asian countries are also in a good state of development

the progress of raw materials and processing equipment drives industrial demand.

resin and blending materials for rotational molding are the primary factors affecting the rotational molding speed, final product quality and performance, and production cost. More and more rotational molding plants choose long-chain olefin (hexene, octene) copolymerization LLDPE, and the proportion of butylene copolymerization LLDPE is declining. In addition, some other advanced technologies for plastic processing are also applied in rotational molding

in order to improve the competitiveness of rotational molding with other plastic processing processes and other materials, and compete for market share, rotational molding equipment is also developing towards automation and high performance. For example, the configuration of rotational molding processing equipment is quick to reach enterprises such as 3M, Adidas, BASF, DuPont, Ford, Hewlett Packard and fully automatic robots, which will improve product quality, reduce waste, save energy and help expand the application range of rotational molding, Enter new target markets that you have rarely touched before

2008 rotoplas'08 and the 33rd annual meeting were held in rosement, Illinois, by the American Association of rotational molding plants. Many high-performance rotational molding resins, such as LLDPE brand ll of ExxonMobil, have high low-temperature impact strength and a wide range of suitable processing temperatures. This hexene copolymer has a density of 0.937/cm3, a melt flow rate of 5g/10min, and has excellent rigidity, whiteness ESCR, low warpage and other characteristics, coupled with good weather resistance, are suitable for purchasing monitors, junction boxes, drinking water tanks, etc. Jerico Plastic Industry Co., Ltd. has launched HDPE roll plastic rotoloy, which has good rigidity, low-temperature impact strength and dimensional stability, density of 0.940 ~ 0.955g/cm3, UV stabilization brand, and can be used as thin-walled products for offshore, medical and other industries. Petroseal, a special roll plastic for small engine fuel tank of Arkema company in France, meets the strict fuel leakage regulations of California Air Resources Bureau (CARB). The outer layer is metallocene MDPE, which melts at about 120 ℃, while nylon 11 blocks the inner layer from melting at about 205 ℃. The HDPE powder of ICO polymer company is a plasma surface treated resin, which greatly improves the bonding strength with polyurethane (PU) foamed plastics. In addition, BASF company of Germany introduced the HALS (hindered amine light stabilizer) copolymer UV stabilizer uvinual 5050h to the market for the first time. It has been certified and licensed for various containers, cans and toys. It has excellent compatibility with polyolefins, but according to our experience, it does not react with other additives

another factor promoting the development of rotational molding industry is the automation and high-performance of rotational molding equipment, which can improve the processing efficiency and reduce the production cost. The goal of the EU funded rotoflex project is to shorten the rotational molding time, increase the output and further improve the product design freedom. There are two main contents. One is to develop polymers, additives and colorants that can be used in any

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