Polyformaldehyde Production Technology
Section A. Polyformaldehyde Production Briefing
Polyformaldehyde is thermoplastic crystallized polymer The nick
name is Super Steel” or Matching Steel”, also called
polyoxymethylene POM. Usually, the polymer formed from formaldehyde
polymerization does not have high polymerization degree and easy to
be de-polymerized when heated. Polyformaldehyde is a surface
smooth, glossy hard and dense material, pale yellow or white color.
It can be durably applied in the temperature range of -40～100°C.
Its abrasion resistance and self-lubrication property is superior
to most engineering plastic with good oil resistance and peroxide
resistance properties, but, its acid, alkali, and UV light
resistance is poor.
Polyformaldehyde is one of five major engineering plastic, is one
of the important new materials for development in polymer industry.
Polyformaldehyde has good properties, wide application range and is
developed quickly. Although polyformaldehyde production started
early in China, due to small production scale, high production cost
and unstable quality of domestic products, users still rely on
Now, main polyformaldehyde producers are Zhangjiagang DuPont Styron
Co.LtdNantong Baoli Co.Ltdand Shanghai Blue Star Co.Ltd and
Yuntianhua Group Co.Ltd.
Polyformaldehyde has homopolymerization and copolymerization two
production processes. The following is to introduce
copolymerization process. This process takes methanol as main raw
material, diethylene glycol, benzene, methylal, boron trifluoride,
triethylamine, sulfuric acid, alkali liquid and other solvent aid
agents as accessory materials. Use DCS control system, equipped
with advanced equipment to improve monomer quality, reduce energy
consumption and assure polyformaldehyde production consistency.
Section B. Polyformaldehyde Production Process
Polyformaldehyde plant consists of methanol oxidation, formaldehyde
concentration, dioxolane and trioxymethylene synthesis and refine,
polyformaldehyde producing processes. The supporting processes have
tail gas boiler, air compressing, nitrogen generation, water
cycling, soft water preparation, sewage treatment and fire fighting
The brief process description is as following:
Methanol is oxidized to form formaldehyde, the formaldehyde after
concentration is supplied for dioxolane and trioxymethylene
synthesis. The formed dioxolane and trioxymethylene after refine
and purification is applied for polyformaldehyde synthesis.
Finally, after stabilizing and drying process, the final product
polyformaldehyde is received.
Section C. Polyformaldehyde Main Applications
Polyformaldehyde resin has excellent comprehensive properties,
therefore, it is widely applied in the automibile industry,
electronic industry, machinery industry, daily consumer goods ,
agricultural irrigation, industrial pipes, chemical industry,,
instruments, appliances, and tools etc.
1.In machinery industry, polyformaldehyde is mainly used for making
gears, cam, bearings, and belt wheel, conveyor belt, electric tool
parts, food and milk products machinery, precision measurement
valve, screw rod for chemical mixing, sausage press and
construction scaffolding parts, truncheons, milk packing box. The
competitive products in this area are nylon and polyester products.
2.In the automobile industry, polyformaldehyde is mainly used for
making car plate components, spring pin sleeve, combination
bearings, Santana car jack nut, universal joint bearings, rigid
plate, spring lining sleeve, gasket, push rod ball sitting set,
speedometer, gears, valves, rain brush, moveable windows and parts,
door handle, safety belt buckles and electric and speaker guard.
3.In electronic industry, polyformaldehyde is mainly used for wash
machine timer, type writer convey gears, coil support, bearing
support, TV set TN magnetic tape, recorder parts, potentiometer
parts, counter parts etc.
4.In textile industry, polyformaldehyde is mainly used for ball
pen, flexible pen parts, lighters, steam iron parts, textile
machinery parts, zippers, and vehicle clothes hook, liners etc.
5.In civil construction industry, polyformaldehyde mainly is used
for floating ball valve, shower spray nozzle, turncock, cold and
hot water adjusting parts, venetian blinds components, pulling rod
for shield, furniture wheel parts etc.
6.In daily consumer goods, polyformaldehyde is mainly used for
making sports appliances such as ski board, sailing board, surfing
board, bag and buckles, small appliances such as agitator, lighter
and household articles.
7.In agricultural gardening and the medical instruments industries,
polyformaldehyde is mainly used for making spraying device, nuts,