CN101880480B - Preparation method of calcinated argil - Google Patents

Abstract

The invention discloses a preparation method of calcined argil, comprising the following process steps of: selecting kaoline containing silicon dioxide not less than 4.8%, aluminium oxide not more than 36% and ferrum not less than 0.5% as raw materials and then calcinating the kaoline as the raw material 3-6 hours at constant temperature, wherein the calcinating temperature is 1000-1100 DEG C; smashing products obtained by calcinating and cooling the kaoline; adding 1-1.5 wt% of silane coupling agents in the smashed products, and then uniformly stirring and mixing under a heating condition to obtain the calcinated argil. The calcinated argil prepared with the method can be used as fillers for manufacturing wires and cables.

Description

The preparation method of calcinated argil

Technical field

The present invention relates to chemical industry filler manufacturing technology field, especially a kind of process of preparing that is used as the calcinated argil of Ethylene Propylene Terpolymer electric wire loading material of rubber.

Background technology

The calcinated argil stable chemical nature, have as loading material of rubber and to extrude or the calendered goods smooth in appearance, have the good characteristics of resistance to acids and bases, thermotolerance and electrical insulating property, can give the good insulativity of terpolymer EP rubber, ventilation property, anti-Jie's property, therefore, calcinated argil obtains to widely apply in terpolymer EP rubber is made.At present the terpolymer EP rubber filler mainly depends on the imported product of the U.S., Britain with calcinated argil, and China is in for this class inorganic non-metallic chief of a pit the phase only sells the raw ore state, and does not still appear in the newspapers for the processing method of making calcinated argil.

Summary of the invention

Problem to be solved by this invention provides a kind of loading material of rubber with the preparation method of calcinated argil, adopts the calcinated argil of this method acquisition can reach the technical requirements that electric wire is used rubber as filler for the manufacture of terpolymer EP rubber.

In order to address the above problem, the preparation method of this calcinated argil is by following processing step:

(1), with through after the magnetic separation bleaching, the weight in wet base percentage is that 7% kaolin is raw material, wherein: SiO ₂48%, Al ₂O ₃36.5%, Fe 0.4%, crystal water content 13.2%, and halloysite crystal habit weight accounts for 60%, whiteness 84%;

(2), making particle diameter with tablets press is 10 millimeters the particle without solid shape;

(3), the kaolin particle after the moulding is placed in the tunnel furnace calcining 3 hours, calcining temperature is 1020 ℃ ± 20 ℃;

(4), adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

(5), to pulverize in the gains by weight 1% add the A-172 silane coupling agent, under 110 ℃ of heating conditions, mix 25 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass mistakes, namely get the calcinated argil finished product.

The preparation method of this calcinated argil can be by following processing step:

(1), with through after the magnetic separation bleaching, the weight in wet base percentage is that 10% kaolin is raw material, wherein SiO ₂46.5%, Al ₂O ₃38.2%, Fe ₂O ₃0.4%, crystal water content 14%, halloysite crystal habit weight accounts for 70%, whiteness 86%;

(2), making particle diameter with tablets press is 20 millimeters the particle without solid shape;

(3), the kaolin particle after the moulding is placed in the tunnel furnace calcining 6 hours, calcining temperature is 1080 ℃ ± 20 ℃;

(4), adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

(5), to pulverize in the gains by weight 1.5% add the A-172 silane coupling agent, under 120 ℃ of heating conditions, mix 30 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass mistakes, namely get the calcinated argil finished product.

The preparation method of this calcinated argil can be by following processing step:

(1), with through after the magnetic separation bleaching, the weight in wet base percentage is that 4% kaolin is raw material, wherein SiO ₂47.8%, Al ₂O ₃37.2%, Fe ₂O ₃0.4%, crystal water content 13.5%, whiteness 85%, halloysite crystal habit weight accounts for 70%, whiteness 85%;

(2), making particle diameter with tablets press is 20 millimeters the particle without solid shape;

(3), the kaolin particle after the moulding is placed in the tunnel furnace calcining 5 hours, calcining temperature is 1070 ℃ ± 20 ℃;

(4), adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

(5), to pulverize in the gains by weight 1.5% add the A-172 silane coupling agent, under 120 ℃ of heating conditions, mix 20 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass mistakes, namely get the calcinated argil finished product.

Because the beneficial effect that has adopted aforesaid method, the present invention to obtain is as follows:

Prepared cable rubber is through cable research institution check, and its properties all reaches and meets GB/T12706.3-2002 " voltage rating 1KV (Um=1.2KV) is to 35KV (Um=40.5KV) extrusion insulating power cable and annex " the 3rd part: " voltage rating 35KV(Um=40.5KV) cable " standard-required.

Embodiment

Below in conjunction with specific embodiment present method is described in further detail:

Embodiment 1:

1, with through after the magnetic separation bleaching, the weight in wet base percentage is that China's Period In Maoming Area kaolin of 7% is raw material, and wherein: SiO2 48%, and Al2O3 36.5%, and Fe 0.4%, crystal water content 13.2%, and halloysite crystal habit weight accounts for 60%, whiteness 84%;

2, making particle diameter with tablets press is 10 millimeters the particle without solid shape;

3, the kaolin particle after the moulding is placed in the tunnel furnace calcining 3 hours, calcining temperature is 1020 ℃ ± 20 ℃;

4, adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

5, to pulverize in the gains by weight 1% add the A-172 silane coupling agent, under 110 ℃ of heating conditions, mix 25 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass get the calcinated argil final product after namely.

The physical and chemical index of the obtained calcinated argil final product of present embodiment is as follows: SiO ₂54.5%, Al ₂O ₃41.5%, Fe ₂O ₃0.5%, whiteness 90.5%, 325 mesh sieve surplus 0.022%, fineness 2500 orders, turbidity 5.

With the Ethylene Propylene Terpolymer cable rubber experiment that rubber 100, vulcanizing agent 3, anti-aging agent 2, calcinated argil 60 proportionings are made, the technical indicator of the cable rubber that obtains is as follows:

1, the tensile strength of cable rubber: 15.2MPa;

2, the elongation at break of cable rubber: 260%;

3, thermal ageing test (135 ℃ * 168h):

(1) the maximum velocity of variation of the tensile strength of cable rubber :+3;

(2) the maximum velocity of variation of the extension at break of cable rubber:--14;

4, volume specific resistance during 20 ℃ of cable rubber: 1.4 * 10 ¹⁴Ω m;

5, the specific inductivity of cable rubber: 2.51;

6, the dielectric loss angle tangent of cable rubber: 2.6 * 10 ^-3

7, dielectric strength: 28MV/m during 20 ℃ of cable rubber.

Embodiment 2:

1, with through after the magnetic separation bleaching, the weight in wet base percentage is that China's Period In Maoming Area kaolin of 10% is raw material, wherein SiO ₂46.5%, Al ₂O ₃38.2%, Fe ₂O ₃0.4%, halloysite crystal habit weight accounts for 70%, crystal water content 14%, whiteness 86;

2, making particle diameter with tablets press is 20 millimeters the particle without solid shape;

3, the kaolin particle after the moulding is placed in the tunnel furnace calcining 6 hours, calcining temperature is 1080 ℃ ± 20 ℃;

4, adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

5, to pulverize in the gains by weight 1.5% add the A-172 silane coupling agent, under 120 ℃ of heating conditions, mix 30 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass get the calcinated argil final product after namely.

The physical and chemical index of the obtained calcinated argil final product of present embodiment is as follows: SiO ₂52.6%, Al ₂O ₃43.2%, Fe ₂O ₃0.5%, whiteness 91.6%,, 325 mesh sieve surpluses 0.02%, fineness 2500 orders, turbidity 2;

The Ethylene Propylene Terpolymer cable rubber of making take rubber 100, vulcanizing agent 3, anti-aging agent 2, calcinated argil 60 proportionings is as example, and the technical indicator of the cable rubber that obtains is as follows:

1, the tensile strength of cable rubber: 16.2MPa;

2, the elongation at break of cable rubber: 290;

3, thermal ageing test (135 ℃ * 168h):

(1) the maximum velocity of variation of the tensile strength of cable rubber :+2;

(2) the maximum velocity of variation of the extension at break of cable rubber:--10;

4, volume specific resistance during 20 ℃ of cable rubber: 2.5 * 10 ¹⁴Ω m;

5, the specific inductivity of cable rubber: 2.54;

6, the dielectric loss angle tangent of cable rubber: 2.5 * 10 ^-3

7, dielectric strength: 35MV/m during 20 ℃ of cable rubber.

Embodiment 3:

1, with through after the magnetic separation bleaching, the weight in wet base percentage is that China's Period In Maoming Area kaolin of 4% is raw material, wherein SiO ₂47.8%, Al ₂O ₃37.2%, Fe ₂O ₃0.4%, crystal water content 13.5%, whiteness 85%, halloysite crystal habit weight accounts for 70%, whiteness 85;

2, making particle diameter with tablets press is 20 millimeters the particle without solid shape;

3, the kaolin particle after the moulding is placed in the tunnel furnace calcining 5 hours, calcining temperature is 1070 ℃ ± 20 ℃;

4, adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

5, to pulverize in the gains by weight 1.5% add the A-172 silane coupling agent, under 120 ℃ of heating conditions, mix 20 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass get the calcinated argil final product after namely.

The physical and chemical index of the obtained calcinated argil final product of present embodiment is as follows: SiO ₂53.8%, Al ₂O ₃42.6%, Fe ₂O ₃0.5%, whiteness 91%, 325 mesh sieve surplus 0.023%, fineness 2500 orders, turbidity 3.

The Ethylene Propylene Terpolymer cable rubber of making take rubber 100, vulcanizing agent 3, anti-aging agent 2, calcinated argil 60 proportionings is as example, and the technical indicator of the cable rubber that obtains is as follows:

1, the tensile strength of cable rubber: 15.6MPa;

2, the elongation at break of cable rubber: 260;

3, thermal ageing test (135 ℃ * 168h):

(1) the maximum velocity of variation of the tensile strength of cable rubber :+5;

(2) the maximum velocity of variation of the extension at break of cable rubber:--12;

4, volume specific resistance during 20 ℃ of cable rubber: 1.6 * 10 ¹⁴Ω m;

5, the specific inductivity of cable rubber: 2.5;

6, the dielectric loss angle tangent of cable rubber: 2.6 * 10 ^-3

7, dielectric strength: 30MV/m during 20 ℃ of cable rubber.

Claims (3)

1. the preparation method of a calcinated argil is characterized in that each processing step is as follows:

(1), with through after the magnetic separation bleaching, the weight in wet base percentage is that 7% kaolin is raw material, wherein: SiO ₂48%, Al ₂O ₃36.5%, Fe 0.4%, crystal water content 13.2%, and halloysite crystal habit weight accounts for 60%, whiteness 84%;

(2), making particle diameter with tablets press is 10 millimeters the particle without solid shape;

(3), the kaolin particle after the moulding is placed in the tunnel furnace calcining 3 hours, calcining temperature is 1020 ℃ ± 20 ℃;

(4), adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

(5), to pulverize in the gains by weight 1% add the A-172 silane coupling agent, under 110 ℃ of heating conditions, mix 25 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass mistakes, namely get the calcinated argil finished product.

2. the preparation method of a calcinated argil is characterized in that each processing step is as follows:

(1), with through after the magnetic separation bleaching, the weight in wet base percentage is that 10% kaolin is raw material, wherein SiO2 46.5%, Al ₂O ₃38.2%, Fe ₂O ₃0.4%, crystal water content 14%, halloysite crystal habit weight accounts for 70%, whiteness 86%;

(2), making particle diameter with tablets press is 20 millimeters the particle without solid shape;

(3), the kaolin particle after the moulding is placed in the tunnel furnace calcining 6 hours, calcining temperature is 1080 ℃ ± 20 ℃;

(4), adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

(5), to pulverize in the gains by weight 1.5% add the A-172 silane coupling agent, under 120 ℃ of heating conditions, mix 30 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass mistakes, namely get the calcinated argil finished product.

3. the preparation method of a calcinated argil is characterized in that each processing step is as follows:

(1), with through after the magnetic separation bleaching, the weight in wet base percentage is that 4% kaolin is raw material, wherein SiO ₂47.8%, Al ₂O ₃37.2%, Fe ₂O ₃0.4%, crystal water content 13.5%, whiteness 85%, halloysite crystal habit weight accounts for 70%, whiteness 85%;

(2), making particle diameter with tablets press is 20 millimeters the particle without solid shape;

(3), the kaolin particle after the moulding is placed in the tunnel furnace calcining 5 hours, calcining temperature is 1070 ℃ ± 20 ℃;

(4), adopt supper micron mill to carry out grinding and processing and reach diameter less than 45 microns calcining cooled gains, screenings≤0.03%, fineness reaches more than 2500 orders;

(5), to pulverize in the gains by weight 1.5% add the A-172 silane coupling agent, under 120 ℃ of heating conditions, mix 20 minutes, make silane coupling agent be wrapped in well the potter's clay surface, adopt the potter's clay after efficient cyclone sieve effects on surface is processed to sieve to cooled gains, make potter's clay product 200 order all-pass mistakes, namely get the calcinated argil finished product.