Selection of the hottest heat-resistant plastics a

2022-08-01
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Selection of heat-resistant plastics and heat-resistant modification of plastics

general selection principles of heat-resistant plastics:

1 Considering the heat resistance

a. it is sufficient to meet the heat resistance. Do not choose too high. Too high will cause the company's deeds to increase. The main reason is that the price of raw material waste stainless steel increased by 6.8% month on month in the first quarter

b. general plastic modification shall be adopted as far as possible. Most heat-resistant plastics belong to special plastics, and their prices are very high; The price of general-purpose plastics is relatively low

c. general purpose plastics with large heat resistance modification shall be selected as far as possible

2. Consider the heat-resistant environmental factors

a. instantaneous heat resistance and long-term heat resistance

b. fast response of dry heat resistance action or wet heat resistance

c. medium corrosion resistance

d. aerobic or anaerobic heat resistance

e. on load heat resistance and off load heat resistance

everyone must be surprised by the above temperature. Why is the thermal deformation temperature of PA PBT material so low? In fact, PA P treatment method: if BT is not heat-resistant, its heat-resistant performance is very poor Here are some examples of heat resistance comparison of plastics after heat resistance modification

I Heat resistance modification of Plastics: in all fillers, except organic fillers, most inorganic mineral fillers can significantly improve the heat resistance temperature of plastics Common heat-resistant fillers include calcium carbonate, talc powder, wollastonite, mica, calcined clay, bauxite and asbestos The smaller the particle size of the filler, the better the modification effect

a. nano filler:

pa6 filled with 5% nano montmorillonite, its thermal deformation temperature can be increased from 70 ° C to 150 ° C

pa6 filled with 10% nano sepiolite, its thermal deformation temperature can be increased from 70 ° C to 160 ° C

pa6 filled with 5% synthetic mica, its thermal deformation temperature can be increased from 70 ° C to 145 ° C

b. conventional filler:

pbt filled with 30% talc powder, its thermal deformation temperature can be increased from 55 ° C to 150 ° C

pbt filled with 30% mica, The thermal deformation temperature can be increased from 55 ℃ to 162 ℃

II Reinforced heat-resistant modification of plastics

the heat-resistant effect of plastics improved by reinforced modification is better than that of filling. The commonly used heat-resistant fibers mainly include asbestos fiber, glass fiber, carbon fiber whisker polymer

1 The crystalline resin was modified by 30% glass fiber reinforced heat resistance

The thermal deformation temperature of PBT increased from 66 ℃ to 210 ℃

The thermal deformation temperature of PET was increased from 98 ℃ to 238 ℃

The thermal deformation temperature of

pp was increased from 102 ℃ to 149 ℃

hdpe thermal deformation temperature increased from 49 ℃ to 127 ℃

The hot deformation temperature of PA6 increased from 70 ℃ to 215 ℃

The thermal deformation temperature of PA66 was increased from 71 ℃ to 255 ℃

The thermal deformation temperature of POM increased from 110 ℃ to 163 ℃

The hot deformation temperature of PEEK was increased from 230 ℃ to 310 ℃

2. The amorphous resin was modified by 30% glass fiber reinforced heat resistance

The thermal deformation temperature of PS increased from 93 ℃ to 104 ℃

pc's hot deformation temperature increased from 132 ℃ to 143 ℃

as's thermal deformation temperature has increased from 90 degrees to 105 degrees for engineering plastics and general plastics

abs thermal deformation temperature increased from 83 ° C to 110 ° C

The hot deformation temperature of PSF was increased from 174 ℃ to 182 ℃

mppo's hot deformation temperature increased from 130 ° C to 155 ° C

III Heat resistance modification of plastics blending

plastics blending improves heat resistance, that is, mixing high heat resistance resin into low heat resin to improve its heat resistance Although the heat resistance of this method is not improved as much as that of adding heat resistance modification, its advantage is that it can improve the heat resistance without affecting other original properties For example:

abs/pc hot deformation temperature can be increased from 93 degrees to 125 degrees

abs/psf (20%) hot deformation temperature can reach 115 degrees

hdpe/pc (20%) Vicat softening point can be increased from 124 degrees to 146 degrees

pp/caco3/ep hot deformation temperature can be increased from 102 ℃ to 150 ℃

IV Plastic crosslinking improves heat resistance. It is commonly used in heat-resistant pipes and cables For example,

pe can increase its thermal deformation temperature from 70 ℃ to 90~110 ℃ after silane crosslinking treatment

After crosslinking, the thermal deformation temperature of

c can be increased from 65 ℃ to 105 ℃

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