Processing method Processing characteristics The PPS provided by the resin manufacturer is a white powder with relatively low quality (4000 ~ 5000) and high crystallinity (75%). This pure PPS cannot be directly plasticized and can only be used for spraying. PPS used for plastic molding must be cross-linked and modified to increase the viscosity of the melt. Generally, it is appropriate for the melting index after cross-linking to reach 10~20; the melting index of glass fiber reinforced PPS can be larger, but it cannot be greater than 200. There are two cross-linking methods for PPS: thermal cross-linking and chemical cross-linking, with thermal cross-linking being the main method. The curing temperature of thermal curing is 150-350°C. Crosslinking will not occur below 150°C and high crosslinking will occur above 350°C, which qui will cause processing difficulties. Chemical crosslinking requires the addition of crosslinking accelerators. Specific varieties include zinc oxide, lead oxide, magnesium oxide, cobalt oxide, etc., as well as phenolic compounds, hexamethoxymethylmelamide, hydrogen peroxide, alkali metals or alkaline earth. hypochlorite, etc. Although PPS is cross-linked, its fluidity does not decrease much; therefore, waste can be reused three times; PPS itself has releasing properties, so there is no need to add a releasing agent. PPS can increase crystallinity and thermal deformation; temperature after heat treatment and post-treatment. The conditions are: temperature 204°C, duration 30 minutes. Other methods (1) Injection molding: A general injection molding machine can be used, and the melt index of glass fiber reinforced PPS is prreference of 50. The process conditions for injection molding are: barrel temperature, pure PPS is 280~330℃, 40% GFPPS mold temperature is 300~350℃; ℃; Injection molding pressure, 50-130MPA. (2) Extrusion: using a ventilated extruder, the process is as follows: the temperature of the feeding section is below 200°C; barrel temperature is 300-340°C, connection body temperature is 320-340°C; and the die temperature is 300 to 320°C. (3) Molding: suitable for large size products, using two compressions, cooling first and then hot pressing. The preheating temperature of hot pressing is about 360℃ for 15 minutes for pure PPS and about 380℃ for 20 minutes for GFPPS; the molding pressure is 10~30Mpa and it is cooled to 150℃ for demolding. (4) Spray training: the spray methodsuspended spray and dry powder thermal spray mixing method are used to spray PPS on the metal surface, and then undergo plasticizing and quenching treatment to obtain the coating at the coating processing temperature of the PPS; is 300°C Above, keep warm for 30 minutes. Application of PPS: When using nylon (PA), polyoxymethylene (POM), polyethylene terephthalate (PET) and polysulfone (PSU) in various fields of machinery industry, they all have defects and do not cannot meet the technical requirements of polyimide (PI). polyetheretherketone (PEEK) and polyamide-imide (PAI) are too expensive. PPS should be the ideal engineering plastic. 1. Machinery industry: In the machinery industry, it is particularly used in the preparation of components in high humidity and highly corrosive environments. Usedfor housings, structural parts, wear-resistant parts and sealing materials, including: pump housing, pump impellers, valves, bearings, bearing supports, piston rings and gears, pulleys, fans , flow meter components, flanges, universal heads, meters, levels, etc. 2. Electronic devices: PPS can account for 30% of the usage in electronic and electrical industry. It is suitable for high temperature electrical components with ambient temperature above 200°C. It can be used to make electric heaters; heater supports, starter coils, etc. on generators and motors. Shields and blades, etc. in televisions, can be used for high voltage shells and sockets, terminal blocks and terminal blocks in electronics industry, transformer manufacturing, choke coils; and skeletons and relay shells, supports of integrated circuits; using high frequency performance, manufacturing class H winding frames and adjustable capacitors, etc. Microelectronic component packaging, connectors, wiring connectors, sockets, coil bobbins, motor housings, electromagnetic adjustment disks, high frequency TV head shafts, relays, adjustment capacitors, fuse holders, tape recorders, magnetic therapy devices and other components. Also used in precision instruments: computers, timers, tachometers, photocopiers, cameras, temperature sensors, and the housings and components of various measuring instruments. 3. Automobile industry: PPS is used in the automobile industry about 45%, mainly in automobile functional parts; reflectors and lamp sockets. It can replace metal to make exhaust pipe circulation valves, turbinese water pumps, pneumatic signal regulators, etc. 4. Household appliances: coverings and protective parts for hot air dryers, curling irons, hair dryers, hair irons, microwave ovens, coffee makers, clothes dryers, electric irons, rice cookers, etc. . 5. Chemical industry: PPS has excellent adhesion and corrosion resistance and is extremely suitable for coating chemical equipment. 4. Material drying process temperature: 100 ~ 105 ℃ Duration: 3 hours 2. Injection molding process 1) Mold temperature: 60-80 ℃ 2) Barrel temperature: Front section: 220 ~ 260 ℃ Middle section : 290 ~ 310 ℃ Rear section: 300 ~ 320 ℃ Nozzle: 290 ~ 300 ℃ 3) Injection pressure: 60 ~ 70Mpa 4) Injection speed: medium speed 5) Injection time: Determined according to size of the room. It is best if the part fills the mold and the. the surface is essentially cooled and finalized
High pressure fog cannon truck
Also known as environmentally friendly fog cannon truck, "haze reduction artifact", etc., it uses high pressure to atomize water into water mist particles the size of dust particles (50~200 microns) and is ejected from the cannon-shaped air duct. The wind is strong and the range is wide. Dust condenses and settles on contact with water. Haze particles into the air, thereby achieving the purpose of removing dust and purifying the air.
There are many types of high-pressure fog cannon trucks on the market, which are mainly divided into two categories: mobile fog cannon trucks and fixed fog cannon trucks.
Mobile fog cannon trucks are divided into two types: vehicle-mounted and trailer-mounted. They have good maneuverability and are not subject to dhe geographic constraints. They are also called dust collection spray trucks. Compared with traditional watering trucks, fog cannon trucks can save water resources, purify air and suppress dust more effectively.
Fixed fog cannon trucks are attached to ground or raised metal structure platforms and rely on their own reach and steering capabilities to spray.
Scope of use of high-pressure fog cannon trucks
High-pressure fog cannon trucks are used to spray pesticides on crops, forests, pastures, etc. to combat pests and diseases; are also used in areas with relatively large dust, such as coal yards and it is used in steel mills, mines, docks, construction sites and other places, it est also used for sterilization, deodorization, cooling, epidemic prevention, etc. landfills or after disasters. Dust pollution of the atmosphere and people's living environment considerably improved.