lm polyethylene powder coatingpdf下载
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product description： product description：
the lm polyethylene powder coating is a thermoplastic powder coating prepared with polyethylene resins, compatibilizers, functional additives, pigments and fillers, etc., it has excellent adhesion, corrosion resistance, chemical stability, electrical insulation, and low temperature resistance.
application field
it is suitable for coating the inside of the fire extinguisher cylinder.
powder properties
non-volatile content: ≥99.5%
dry fluidity: fluidization floating ≥20%
specific gravity: 0.91-0.95 (varies by different colors)
particle size distribution: ≤300um
melt index: 10 g/10min (2.16kg, 190℃) [depending on the workpiece to be coated and the process].
storage: store in a ventilated and dry room below 35℃, and prevent from being close to the source of ignition. the storage period is two years from the manufacturing date. it shall be retested when it is expired, and it can still be used if it is qualified. in addition, it is recommended that the product shall be used on the first-in and first-out basis.
packing: it is packed in composite paper bags, and the net weight per bag is 20 kg.
application
pre-treatment: degreasing, rust removal, and phosphating.
pre-heating temperature of workpiece to 250-350℃ [it can be adjusted according to the cylinder specifications].
coating method: roll coating and pressure feed coating.
plasticization at 180-220℃ for 0-5 minutes [it can be adjusted according to the cylinder specifications, and the post-heating plasticization process is beneficial to obtain a smooth coating].
cooling: air cooling or natural cooling.
coating performance
sample panel prepared for the following test data.
2mm thick steel plate, degreasing and rust removal, and coatingapplied with thickness of 400um.
color gb/t9761
no visible difference
(compared with the standard plate)
appearance (visual inspection)
level and smooth (slight orange peel is permissible)
film thickness μm gb/t 13452.2
250~600
gloss % gb/t 9754, 60°
10~80 (it is adjusted according to customer requirements)
bending (with the film thickness of 200μm) gb/t 6742
≤2mm
shore hardness (d) gb/t 2411
45~55
low temperature resistance q/hj 008-2008
no cracking at -35℃ for 60h
adhesion (10mm width 180° peeling)
≧3 kg/10mm (it is judged to have qualified adhesion when the coating snaps and breaks)
high and low temperature resistance test (-30~20~60~20℃)
8 cycles, no cracking or detachment of the coating
soaked in 5%hcl for 7d gb/t11547
no change in coating appearance
soaked in 5%naoh for 7d gb/t11547
no change in coating appearance
soaked in 5%nacl for 7d gb/t11547
no change in coating appearance
hygiene & safety
this powder coating is a non-toxic product, but the inhaling of dust shall be avoided during use. it is recommended that operators shall wear appropriate dust masks and glasses.
caution
excessive heating will lead to aging and discoloration of the coating film. however, if the temperature is too low, it would cause the defects such as poor powdering, rough coating film, etc. therefore, the optimum heating temperature shall be determined through experiments according to the metal thickness and the coating facilities of the customer;
workpiece design: the sharp parts shall be ground, there shall be no gap in the welding;
do not touch the inner wall of the treated cylinder with bare hands, as the place contacting with the hand will affect powdering and adhesion of the coating;
this product is not recommended to use in post-processing (re-deformed workpiece after coating) products;
like all polymer powders, especially in the flowing condition, the powder coating can be ignited or burned if contact with a high-temperature source.