CN102850053A - Preparation method of mineral insulated cable porcelain column - Google Patents
Preparation method of mineral insulated cable porcelain column Download PDFInfo
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- CN102850053A CN102850053A CN2012103629317A CN201210362931A CN102850053A CN 102850053 A CN102850053 A CN 102850053A CN 2012103629317 A CN2012103629317 A CN 2012103629317A CN 201210362931 A CN201210362931 A CN 201210362931A CN 102850053 A CN102850053 A CN 102850053A
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Abstract
The invention discloses a preparation method of a mineral insulated cable porcelain column. According to the method, cellulose with 600-800 polymerization degree is used as a raw material and then subjected to alkalization and etherification under certain technological conditions to obtain an adhesion agent with 50-80mPa*s viscosity. The adhesion agent has appropriate viscosities so that the calcination temperature of the porcelain column can be reduced to 750 DEG C in the later period of porcelain column manufacturing, and energy consumption is greatly reduced; and the adhesion agent can be dissolved in water at normal temperatures, and energy consumption for dissolving the adhesion agent is saved. The preparation method is used for preparing magnesium oxide of the porcelain column, the energy consumption during magnesium oxide producing is reduced, and the production costs of the magnesium oxide is around 2/3 of those of electric smelting magnesium oxide. According to the magnesium oxide porcelain column prepared by the preparation method, the density of the final porcelain column is 2.0g/cm<3>, and the weight of the porcelain column can be reduced by 10%-15% without influencing the production rate of the porcelain column. According to the preparation method of the mineral insulated cable porcelain column, the technical problem during a production process of the mineral insulated cable porcelain column is solved, the energy consumption is greatly reduced, and the production costs of the mineral insulated cable porcelain column are reduced.
Description
Technical field
The present invention relates to the mineral insulated cable technical field, relate in particular to a kind of preparation method of mineral insulated cable porcelain knob.
Background technology
Mineral insulated cable plays extremely important effect as fireproof cable in the development of the national economy.Along with Economic development, the use of this mineral insulated cable is more and more extensive.It is all domestic that present China mineral insulated cable is mainly produced material, but because the characteristic of insulating material magnesium oxide stopping composition, in cable making processes, there are all the time the shortcomings such as high energy consumption, poor efficiency, cause the production cost of mineral insulated cable to be difficult to reduce.Simultaneously, under the overall background of energy-saving and emission-reduction, enterprise also more and more payes attention to reducing energy consumption, improves and make efficient and save material.
Tradition mineral insulated cable porcelain knob adopts the mixture of polyvinyl alcohol and Zinic stearas as binding agent, in the making processes of porcelain knob, after the mixture of polyvinyl alcohol and Zinic stearas melted by hot water bath, when the magnesia powder granulation, add to be no more than the spraying of 3% ratio, the humidity of granulation rear oxidation magnesium granules is controlled at 8～10%.There are two shortcomings in above-mentioned binding agent: when (1) binding agent uses, need to its thawing can be used by hot water bath, use trouble and have power consumption; (2) in the later stage of porcelain knob making, porcelain knob need to can vapor away the moisture in the binding agent under 1250 ℃ fully in the calcining through 7 hours, and energy consumption is huge.
Present domestic mineral insulated cable is electrically molten magnesia with the most of employing of magnesium oxide.The preparation process of electrically molten magnesia will be through two basic steps, and calcining obtains light calcined magnesia, and the powdery light calcined magnesia is carried out melting.Above-mentioned whole process length consuming time, energy consumption is high.And in the preparation process of later stage mineral insulated cable insulation porcelain knob, calcining temperature is also higher, and calcination time is long, is difficult to significantly reduce the manufacturing cost of cable, improves and makes efficient.
In addition, after compacting under 10～12 atmospheric pressures, the density of porcelain knob is controlled at 2.5～2.7g/cm to the magnesium oxide particle of process granulation by tabletting machine
3After the calcining of the porcelain knob that suppresses through 7h under 1250 ℃ of conditions, its density is 2.3～2.5g/cm
3The density of the porcelain knob that prior art is prepared is larger, and weight is large.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of preparation method of mineral insulated cable porcelain knob.The present invention has greatly reduced energy consumption, has reduced the production cost of mineral insulated cable porcelain knob.
Technical scheme provided by the invention is:
A kind of preparation method of mineral insulated cable porcelain knob may further comprise the steps:
Step 1, preparation binding agent and mineral insulated cable porcelain knob magnesium oxide, wherein, binding agent prepares by the following method: step (1) adopts sodium hydroxide that the polymerization degree is carried out alkalinisation treatment 0.5～1h at 600～800 Mierocrystalline cellulose, the consumption of sodium hydroxide is 0.5～0.6 times of cellulosic quality, alkalization temperature is less than or equal to 50 ℃, the reaction product that step (2) adopts propylene oxide and monochloroethane that described step (1) is obtained is carried out etherificate and is processed 0.5～1h, wherein, the consumption of propylene oxide is respectively 0.1～0.2 times of cellulosic quality, the consumption of monochloroethane is 0.8～1.2 times of cellulosic quality, step (3) is carried out subsequent disposal to the reaction product that described step (2) obtains, and obtains binding agent;
Step 2, the binding agent of described step 1 preparation is soluble in water, and mix with magnesium oxide with the mineral insulated cable porcelain knob of described step 1 preparation, magnesium oxide particle obtained;
Step 3, the magnesium oxide particle that described step 2 is obtained are suppressed, and obtain porcelain knob;
Step 4, the porcelain knob calcining that described step 3 is obtained, calcining temperature is more than or equal to 750 ℃.
Preferably, among the preparation method of described mineral insulated cable porcelain knob, in the preparation method's of described binding agent the step (1), described Mierocrystalline cellulose is processed by sulfated waste cotton velvet and is obtained, wherein, the contained cellulosic polymerization degree is 600～800 in the described sulfated waste cotton velvet.
Preferably, among the preparation method of described mineral insulated cable porcelain knob, in the preparation method's of described binding agent the step (1), described alkalinisation treatment is carried out under nitrogen environment, and pressure is less than or equal to 0.05MPa.
Preferably, among the preparation method of described mineral insulated cable porcelain knob, in the preparation method's of described binding agent the step (1), the pressure of the reaction environment that described etherificate is processed is less than or equal to 0.15MPa.
Preferably, among the preparation method of described mineral insulated cable porcelain knob, in the described step 1, described mineral insulated cable porcelain knob prepares by the following method with magnesium oxide:
Step (1) obtains light calcined magnesia to the temperature lower calcination of raw material magnesium oxide at 1100～1200 ℃;
The light calcined magnesia that step (2) adopts described step (1) to obtain makes the light calcined magnesia of two kinds of particle diameters, is respectively particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias;
Step (3) is mixed particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, obtain mineral insulated cable porcelain knob magnesium oxide, wherein, particle diameter is 3～5% of mineral insulated cable porcelain knob usefulness magnesium oxide total amount greater than the consumption of 150 purpose light calcined magnesias.
Preferably, among the preparation method of described mineral insulated cable porcelain knob, described mineral insulated cable porcelain knob is with in the step among the magnesian preparation method (1), and raw material magnesium oxide obtains by the following method: the screening diameter is less than the raw material magnesium oxide of 8mm from magnesite tailings.
Preferably, among the preparation method of described mineral insulated cable porcelain knob, described mineral insulated cable porcelain knob is 1.5～1.7g/cm with the density of the light calcined magnesia that the step among the magnesian preparation method (1) obtains
3
Preferably, among the preparation method of described mineral insulated cable porcelain knob, in the described step 2, the binding agent of described step 1 preparation is water-soluble with 2～3% ratio of magnesian quality according to the mineral insulated cable porcelain knob.
Preferably, among the preparation method of described mineral insulated cable porcelain knob, in the described step 3, the magnesium oxide particle that described step 2 obtains is suppressed under the pressure of setting, so that the density of porcelain knob is 2.1～2.3g/cm
3
Preferably, among the preparation method of described mineral insulated cable porcelain knob, in the described step 4, calcining temperature is 750 ℃.
The preparation method of mineral insulated cable porcelain knob of the present invention has following beneficial effect:
The present invention adopt the polymerization degree at 600～800 Mierocrystalline cellulose as starting material, process through the alkalinisation treatment under certain processing condition and etherificate, obtain viscosity at the binding agent of 50～80mPas.Above-mentioned binding agent has suitable viscosity, and bond effect is good during use, produces without layering; In the later stage that porcelain knob is made, calcining temperature can be reduced to 750 ℃, greatly reduces energy consumption; Binding agent has good water-soluble, at normal temperatures namely can be water-soluble, and very easy to use, than traditional binding agent, saved the energy consumption of binding agent dissolving step.
The present invention adopts sulfated waste cotton velvet as the cellulosic starting material of preparation, the contained cellulosic polymerization degree of sulfated waste cotton velvet is 600～800, just in time satisfy the mineral insulated cable porcelain knob arts demand of binding agent, because only have when cellulosic degree of polymerization 600～800 the time, can obtain medium viscosity of the present invention at the binding agent of 50～80mPas, the present invention utilizes the characteristic of sulfated waste cotton velvet, has realized the recycling to sulfated waste cotton velvet, has improved the utilising efficiency of resource.
The present invention has reduced the energy consumption of magnesium oxide production process for the preparation of the magnesian preparation method of porcelain knob, the magnesium oxide production cost is about about 2/3 of electrically molten magnesia.Adopt the magnesium oxide of method preparation of the present invention to produce porcelain knob, the density of the porcelain knob that finally obtains is 1.9～2.0g/cm
3, the weight of porcelain knob can alleviate 10～15%, but the productivity of porcelain knob is unaffected.
The invention solves the technical problem in the mineral insulated cable porcelain knob production process, greatly reduced energy consumption, reduced the production cost of mineral insulated cable porcelain knob.
Embodiment
Below the present invention is described in further detail, can implement according to this with reference to the specification sheets literal to make art technology high-ranking official.
The invention provides a kind of preparation method of mineral insulated cable porcelain knob, may further comprise the steps:
Step 1, preparation binding agent and mineral insulated cable porcelain knob magnesium oxide, wherein, binding agent prepares by the following method: step (1) adopts sodium hydroxide that the polymerization degree is carried out alkalinisation treatment 0.5～1h at 600～800 Mierocrystalline cellulose, the consumption of sodium hydroxide is 0.5～0.6 times of cellulosic quality, alkalization temperature is less than or equal to 50 ℃, the reaction product that step (2) adopts propylene oxide and monochloroethane that described step (1) is obtained is carried out etherificate and is processed 0.5～1h, wherein, the consumption of propylene oxide is respectively 0.1～0.2 times of cellulosic quality, the consumption of monochloroethane is 0.8～1.2 times of cellulosic quality, step (3) is carried out subsequent disposal to the reaction product that described step (2) obtains, and obtains binding agent;
Step 2, the binding agent of described step 1 preparation is soluble in water, and mix with magnesium oxide with the mineral insulated cable porcelain knob of described step 1 preparation, magnesium oxide particle obtained;
Step 3, the magnesium oxide particle that described step 2 is obtained are suppressed, and obtain porcelain knob;
Step 4, the porcelain knob calcining that described step 3 is obtained, calcining temperature is more than or equal to 750 ℃.
Among the preparation method of described mineral insulated cable porcelain knob, in the preparation method's of described binding agent the step (1), described Mierocrystalline cellulose is processed by sulfated waste cotton velvet and is obtained, and wherein, the contained cellulosic polymerization degree is 600～800 in the described sulfated waste cotton velvet.
Among the preparation method of described mineral insulated cable porcelain knob, in the preparation method's of described binding agent the step (1), described alkalinisation treatment is carried out under nitrogen environment, and pressure is less than or equal to 0.05MPa.
Among the preparation method of described mineral insulated cable porcelain knob, in the preparation method's of described binding agent the step (1), the pressure of the reaction environment that described etherificate is processed is less than or equal to 0.15MPa.
Among the preparation method of described mineral insulated cable porcelain knob, in the described step 1, described mineral insulated cable porcelain knob prepares by the following method with magnesium oxide:
Step (1) obtains light calcined magnesia to the temperature lower calcination of raw material magnesium oxide at 1100～1200 ℃;
The light calcined magnesia that step (2) adopts described step (1) to obtain makes the light calcined magnesia of two kinds of particle diameters, is respectively particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias;
Step (3) is mixed particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, obtain mineral insulated cable porcelain knob magnesium oxide, wherein, particle diameter is 3～5% of mineral insulated cable porcelain knob usefulness magnesium oxide total amount greater than the consumption of 150 purpose light calcined magnesias.
Among the preparation method of described mineral insulated cable porcelain knob, described mineral insulated cable porcelain knob is with in the step among the magnesian preparation method (1), and raw material magnesium oxide obtains by the following method: the screening diameter is less than the raw material magnesium oxide of 8mm from magnesite tailings.
Among the preparation method of described mineral insulated cable porcelain knob, described mineral insulated cable porcelain knob is 1.5～1.7g/cm with the density of the light calcined magnesia that the step among the magnesian preparation method (1) obtains
3
Among the preparation method of described mineral insulated cable porcelain knob, in the described step 2, the binding agent of described step 1 preparation is water-soluble with 2～3% ratio of magnesian quality according to the mineral insulated cable porcelain knob.
Among the preparation method of described mineral insulated cable porcelain knob, in the described step 3, the magnesium oxide particle that described step 2 obtains is suppressed under the pressure of setting, so that the density of porcelain knob is 2.1～2.3g/cm
3
Among the preparation method of described mineral insulated cable porcelain knob, in the described step 4, calcining temperature is 750 ℃.
The light calcined magnesia of two kinds of particle diameters is mixed with certain proportion, so that the space between the light calcined magnesia particle is less, so that porcelain knob is finer and close.Simultaneously, owing in the preparation process in porcelain knob later stage, also needing porcelain knob is calcined, to remove no-bonder, but in fact also can melt on the surface of this calcination stage light calcined magnesia particle, thereby so that the bond effect between the light calcined magnesia particle is better.Therefore, the light calcined magnesia of two kinds of particle diameters mixes with suitable ratio, also helps to improve the intensity of porcelain knob.The selection of the particle diameter of light calcined magnesia and the blending ratio between the different-grain diameter will have influence on the density of porcelain knob.Select among the present invention greater than 150 orders and two kinds of particle diameters of 80～150 orders, and be 3～5% greater than 150 purpose light calcined magnesias with respect to the addition of magnesium oxide total amount.
In the calcination process of step 1, the magnesian crystallization degree of raw material can change, therefore, and by control calcining temperature, the light calcined magnesia that can obtain having certain density.The density of light calcined magnesia also can have influence on the density of porcelain knob simultaneously.Calcining temperature among the present invention is 1100～1200 ℃.
Binding agent proportionally is dissolved in specific conductivity and is not higher than in 20 the water, and wherein, the temperature of water is normal temperature.
Binding agent mixes with the magnesium oxide that the mineral insulated cable porcelain knob is used in the mode of spraying in tablets press, needs the humidity of control magnesium oxide particle 10～15%.
Magnesium oxide particle is suppressed according to different requirements by tabletting machine, with the preparation porcelain knob.Pressure-controlling is at 8～10 atmospheric pressures in the pressing process, and than 10～12 atmospheric pressures of prior art, selected pressure is relatively low, has reduced the requirement to equipment, also helps the work-ing life of extension device.The density of pressing process control porcelain knob is at 2.1～2.3g/cm
3Porcelain knob is after 750 ℃ of lower 3h calcinings, and its density is at 1.9～2.0g/cm3.The weight saving of porcelain knob 10～15%.
Porcelain knob cooling through calcining.
With porcelain knob assembling after the drying baker oven dry, through processing such as drawing quenchings, obtain at last mineral insulated cable.After tested, cable productivity and traditional method are suitable, without the productivity losing phenomenon.The productivity of porcelain knob is exactly to adopt the quantity of the mineral insulated cable that the porcelain knob of certain volume produces.
Embodiment one
The preparation process of step 1, binding agent is as follows:
Step (1) adopts sodium hydroxide that the polymerization degree is carried out alkalinisation treatment 0.5h at 600～800 Mierocrystalline cellulose, the consumption of sodium hydroxide is 0.5 times of cellulosic quality, alkalization temperature is at 40 ℃, and alkalinisation treatment is carried out under nitrogen environment, and pressure is all the time at 0.04MPa;
The reaction product that step (2) adopts propylene oxide and monochloroethane that described step (1) is obtained is carried out etherificate and is processed 0.5h, wherein, the consumption of propylene oxide is respectively 0.1 times of cellulosic quality, the consumption of monochloroethane is 0.8 times of cellulosic quality, and the pressure of the reaction environment that etherificate is processed keeps 0.14MPa;
Step (3) is carried out subsequent disposal to the reaction product that described step (2) obtains:
Step (a), separate the liquid in the reaction product that described step (2) obtains, obtain solid reaction product; The liquid that separation is obtained adds thermal distillation, and collecting ring Ethylene Oxide and monochloroethane are realized the recovery to organic solvent,
Step (b), the solid reaction product in the step (a) is carried out Glacial acetic acid neutralization, and with pure water wash to the pH value be 7,
Step (c), the solid reaction product that utilizes whizzer drying step (b) to obtain, and utilize drier, obtain binding agent.
The viscosity of binding agent is 68mPas in the present embodiment.
The mineral insulated cable porcelain knob is as follows with magnesian preparation process:
Step (1) is to the temperature lower calcination 3h of raw material magnesium oxide at 1150 ℃, obtain purity greater than 90% light calcined magnesia, raw material magnesium oxide obtains by the following method: the screening diameter passes through the magnetic separation of strong magnetic machine again less than the raw material magnesium oxide of 8mm from magnesite tailings;
The light calcined magnesia that step (2) adopts described step (1) to obtain makes the light calcined magnesia of two kinds of particle diameters, be respectively particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, its detailed process is, the light calcined magnesia that described step 1 is obtained adopts Raymond mill to be ground to more than 50 orders, then utilize grading oscillating screen to screen to the light calcined magnesia after grinding, the screening particle diameter of grading oscillating screen is respectively 80 orders and 150 orders, it is for subsequent use greater than 150 orders and 80～150 purpose light calcined magnesias that screening obtains particle diameter, screening obtain particle diameter less than 80 purpose light calcined magnesias again with after light calcined magnesia that described step (1) obtains mixes, grind;
Step (3) is mixed particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, obtain mineral insulated cable porcelain knob magnesium oxide, wherein, particle diameter is 5% of mineral insulated cable porcelain knob usefulness magnesium oxide total amount greater than the consumption of 150 purpose light calcined magnesias;
The mineral insulated cable porcelain knob that the described step of step (4) (3) obtains passes through the magnetic separation of strong magnetic machine again with magnesium oxide, the effective diameter of strong magnetic machine is less than 15cm.
The density of the light calcined magnesia that step described in the present embodiment (1) obtains is 1.65g/cm
3
Step 2, the binding agent of described step 1 preparation is dissolved in specific conductivity according to the mineral insulated cable porcelain knob with 2.5% ratio of magnesian quality is not higher than in 20 the water, and mix with magnesium oxide with the mineral insulated cable porcelain knob of described step 1 preparation, obtain magnesium oxide particle, the humidity of magnesium oxide particle is controlled at 13%;
Step 3, the magnesium oxide particle that described step 2 is obtained are suppressed under the pressure of 9 atmospheric pressures, obtain porcelain knob, and porcelain knob density is 2.1g/cm
3
Step 4, the porcelain knob calcining that described step 3 is obtained, calcining temperature is 750 ℃, and the calcining time length is 3h, and porcelain knob density is 1.93g/cm
3, the porcelain knob after the calcining is through overcooling.
Adopt the magnesium oxide of the present embodiment to produce porcelain knob, porcelain knob density is 1.93g/cm
3, insulation resistance surpasses 10000M Ω, withstand voltage 2500V, and indices meets the requirements.
Embodiment two
The preparation process of step 1, binding agent is as follows:
Step (1) adopts sodium hydroxide that the polymerization degree is carried out alkalinisation treatment 1h at 600～800 Mierocrystalline cellulose, and the consumption of sodium hydroxide is 0.6 times of cellulosic quality, 50 ℃ of alkalization temperatures, and alkalinisation treatment is carried out under nitrogen environment, pressure 0.05MPa;
The reaction product that step (2) adopts propylene oxide and monochloroethane that described step (1) is obtained is carried out etherificate and is processed 1h, wherein, the consumption of propylene oxide is respectively 0.2 times of cellulosic quality, the consumption of monochloroethane is 1.2 times of cellulosic quality, the pressure 0.15MPa of the reaction environment that etherificate is processed;
Step (3) is carried out subsequent disposal to the reaction product that described step (2) obtains:
Step (a), separate the liquid in the reaction product that described step (2) obtains, obtain solid reaction product; The liquid that separation is obtained adds thermal distillation, and collecting ring Ethylene Oxide and monochloroethane are realized the recovery to organic solvent,
Step (b), the solid reaction product in the step (a) is carried out Glacial acetic acid neutralization, and with pure water wash to the pH value be 7,
Step (c), the solid reaction product that utilizes whizzer drying step (b) to obtain, and utilize drier, obtain binding agent.
Mierocrystalline cellulose in the step in the present embodiment (1) obtains for processing by sulfated waste cotton velvet, and wherein, the contained cellulosic polymerization degree is 600～800 in the described sulfated waste cotton velvet.
Process the cellulosic method of preparation by sulfated waste cotton velvet as follows:
Step (1), utilize gravity separation equipment to remove the impurity such as cotton seed hulls in the sulfated waste cotton velvet, sand, coal ash,
Step (2), the sulfated waste cotton velvet that utilizes clorox that described step (1) is processed are bleached, and add simultaneously a small amount of tensio-active agent, the adding proportion of tensio-active agent be sulfated waste cotton velvet quality 1/2000, bleaching time is 45min,
Step (3), the sulfated waste cotton velvet that described step (2) is processed wash repeatedly, wash the impurity such as wax, pectin, the pH value that makes sulfated waste cotton velvet is 7, obtain Mierocrystalline cellulose, at this moment, the cellulosic polymerization degree is 600～800, and purity is greater than 95%, staple length is less than 180 μ m, and whiteness is greater than 82.
The viscosity of binding agent is 60mPas in the present embodiment.
The mineral insulated cable porcelain knob is as follows with magnesian preparation process:
Step (1) is to the temperature lower calcination 3h of raw material magnesium oxide at 1180 ℃, obtain purity greater than 90% light calcined magnesia, raw material magnesium oxide obtains by the following method: the screening diameter passes through the magnetic separation of strong magnetic machine again less than the raw material magnesium oxide of 8mm from magnesite tailings;
The light calcined magnesia that step (2) adopts described step (1) to obtain makes the light calcined magnesia of two kinds of particle diameters, be respectively particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, its detailed process is, the light calcined magnesia that described step 1 is obtained adopts Raymond mill to be ground to more than 50 orders, then utilize grading oscillating screen to screen to the light calcined magnesia after grinding, the screening particle diameter of grading oscillating screen is respectively 80 orders and 150 orders, it is for subsequent use greater than 150 orders and 80～150 purpose light calcined magnesias that screening obtains particle diameter, screening obtain particle diameter less than 80 purpose light calcined magnesias again with after light calcined magnesia that described step (1) obtains mixes, grind;
Step (3) is mixed particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, obtain mineral insulated cable porcelain knob magnesium oxide, wherein, particle diameter is 4% of mineral insulated cable porcelain knob usefulness magnesium oxide total amount greater than the consumption of 150 purpose light calcined magnesias;
The mineral insulated cable porcelain knob that the described step of step (4) (3) obtains passes through the magnetic separation of strong magnetic machine again with magnesium oxide, the effective diameter of strong magnetic machine is less than 15cm.
The density of the light calcined magnesia that step described in the present embodiment (1) obtains is 1.73g/cm
3
Step 2, the binding agent of described step 1 preparation is dissolved in specific conductivity according to the mineral insulated cable porcelain knob with 2.5% ratio of magnesian quality is not higher than in 20 the water, and mix with magnesium oxide with the mineral insulated cable porcelain knob of described step 1 preparation, obtain magnesium oxide particle, the humidity of magnesium oxide particle is controlled at 10%;
Step 3, the magnesium oxide particle that described step 2 is obtained are suppressed under the pressure of 10 atmospheric pressures, obtain porcelain knob, and porcelain knob density is 2.2g/cm
3
Step 4, the porcelain knob calcining that described step 3 is obtained, calcining temperature is 750 ℃, and the calcining time length is 3h, and porcelain knob density is 1.92g/cm
3, the porcelain knob after the calcining is through overcooling.
The insulation resistance of the porcelain knob in the present embodiment surpasses 10000M Ω, withstand voltage 2500V, and indices meets the requirements.
Embodiment three
The preparation process of step 1, binding agent is as follows:
Step (1) adopts sodium hydroxide that the polymerization degree is carried out alkalinisation treatment 0.8h at 600～800 Mierocrystalline cellulose, and the consumption of sodium hydroxide is 0.7 times of cellulosic quality, 45 ℃ of alkalization temperatures, and alkalinisation treatment is carried out under nitrogen environment, pressure 0.02MPa;
The reaction product that step (2) adopts propylene oxide and monochloroethane that described step (1) is obtained is carried out etherificate and is processed 0.9h, wherein, the consumption of propylene oxide is respectively 0.18 times of cellulosic quality, the consumption of monochloroethane is 1.1 times of cellulosic quality, and the pressure of the reaction environment that etherificate is processed keeps 0.11MPa;
Step (3) is carried out subsequent disposal to the reaction product that described step (2) obtains:
Step (a), separate the liquid in the reaction product that described step (2) obtains, obtain solid reaction product; The liquid that separation is obtained adds thermal distillation, and collecting ring Ethylene Oxide and monochloroethane are realized the recovery to organic solvent,
Step (b), the solid reaction product in the step (a) is carried out Glacial acetic acid neutralization, and with pure water wash to the pH value be 7,
Step (c), the solid reaction product that utilizes whizzer drying step (b) to obtain, and utilize drier, obtain binding agent.
Mierocrystalline cellulose in the step in the present embodiment (1) obtains for processing by sulfated waste cotton velvet, and wherein, the contained cellulosic polymerization degree is 600～800 in the described sulfated waste cotton velvet.
Process the cellulosic method of preparation by sulfated waste cotton velvet as follows:
Step (1), utilize gravity separation equipment to remove the impurity such as cotton seed hulls in the sulfated waste cotton velvet, sand, coal ash,
Step (2), the sulfated waste cotton velvet that utilizes clorox that described step (1) is processed are bleached, and add simultaneously a small amount of tensio-active agent, the adding proportion of tensio-active agent be sulfated waste cotton velvet quality 1/2000, bleaching time is 45min,
Step (3), the sulfated waste cotton velvet that described step (2) is processed wash repeatedly, wash the impurity such as wax, pectin, the pH value that makes sulfated waste cotton velvet is 7, obtain Mierocrystalline cellulose, at this moment, the cellulosic polymerization degree is 600～800, and purity is greater than 95%, staple length is less than 180 μ m, and whiteness is greater than 82.
The viscosity of binding agent is 74mPas in the present embodiment.
The magnesian preparation method of mineral insulated cable porcelain knob may further comprise the steps:
Step 1, to the temperature lower calcination 2.5h of raw material magnesium oxide at 1100 ℃, obtain purity greater than 90% light calcined magnesia, raw material magnesium oxide obtains by the following method: the screening diameter passes through the magnetic separation of strong magnetic machine again less than the raw material magnesium oxide of 8mm from magnesite tailings;
Step 2, the light calcined magnesia that adopts described step 1 to obtain makes the light calcined magnesia of two kinds of particle diameters, be respectively particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, its detailed process is, the light calcined magnesia that described step 1 is obtained adopts Raymond mill to be ground to more than 50 orders, then utilize grading oscillating screen to screen to the light calcined magnesia after grinding, the screening particle diameter of grading oscillating screen is respectively 80 orders and 150 orders, it is for subsequent use greater than 150 orders and 80～150 purpose light calcined magnesias that screening obtains particle diameter, screening obtain particle diameter less than 80 purpose light calcined magnesias again with after light calcined magnesia that described step 1 obtains mixes, grind;
Step 3, particle diameter is mixed greater than 150 orders and 80～150 purpose light calcined magnesias, obtain mineral insulated cable porcelain knob magnesium oxide, wherein, particle diameter is 3% of mineral insulated cable porcelain knob usefulness magnesium oxide total amount greater than the consumption of 150 purpose light calcined magnesias;
The mineral insulated cable porcelain knob that step 4, described step 3 obtain passes through the magnetic separation of strong magnetic machine again with magnesium oxide, the effective diameter of strong magnetic machine is less than 15cm.
The density of the light calcined magnesia that step 1 obtains described in the present embodiment is 1.5g/cm
3
Step 2, the binding agent of described step 1 preparation is dissolved in specific conductivity according to the mineral insulated cable porcelain knob with 2.5% ratio of magnesian quality is not higher than in 20 the water, and mix with magnesium oxide with the mineral insulated cable porcelain knob of described step 1 preparation, obtain magnesium oxide particle, the humidity of magnesium oxide particle is controlled at 13%;
Step 3, the magnesium oxide particle that described step 2 is obtained are suppressed under the pressure of 9 atmospheric pressures, obtain porcelain knob, and porcelain knob density is 2.1g/cm
3
Step 4, the porcelain knob calcining that described step 3 is obtained, calcining temperature is 750 ℃, and the calcining time length is 3h, and porcelain knob density is 1.91g/cm
3, the porcelain knob after the calcining is through overcooling.
Adopt the magnesium oxide of the present embodiment to produce porcelain knob, porcelain knob density is 1.91g/cm
3, insulation resistance surpasses 10000M Ω, withstand voltage 2500V, and indices meets the requirements.
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification sheets and the embodiment, it can be applied to various suitable the field of the invention fully, for those skilled in the art, can easily realize other modification, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the embodiment that describes.
Claims (10)
1. the preparation method of a mineral insulated cable porcelain knob is characterized in that, may further comprise the steps:
Step 1, preparation binding agent and mineral insulated cable porcelain knob magnesium oxide, wherein, binding agent prepares by the following method: step (1) adopts sodium hydroxide that the polymerization degree is carried out alkalinisation treatment 0.5～1h at 600～800 Mierocrystalline cellulose, the consumption of sodium hydroxide is 0.5～0.6 times of cellulosic quality, alkalization temperature is less than or equal to 50 ℃, the reaction product that step (2) adopts propylene oxide and monochloroethane that described step (1) is obtained is carried out etherificate and is processed 0.5～1h, wherein, the consumption of propylene oxide is respectively 0.1～0.2 times of cellulosic quality, the consumption of monochloroethane is 0.8～1.2 times of cellulosic quality, step (3) is carried out subsequent disposal to the reaction product that described step (2) obtains, and obtains binding agent;
Step 2, the binding agent of described step 1 preparation is soluble in water, and mix with magnesium oxide with the mineral insulated cable porcelain knob of described step 1 preparation, magnesium oxide particle obtained;
Step 3, the magnesium oxide particle that described step 2 is obtained are suppressed, and obtain porcelain knob;
Step 4, the porcelain knob calcining that described step 3 is obtained, calcining temperature is more than or equal to 750 ℃.
2. the preparation method of mineral insulated cable porcelain knob as claimed in claim 1, it is characterized in that, in the preparation method's of described binding agent the step (1), described Mierocrystalline cellulose is processed by sulfated waste cotton velvet and is obtained, wherein, the contained cellulosic polymerization degree is 600～800 in the described sulfated waste cotton velvet.
3. the preparation method of mineral insulated cable porcelain knob as claimed in claim 1 is characterized in that, in the preparation method's of described binding agent the step (1), described alkalinisation treatment is carried out under nitrogen environment, and pressure is less than or equal to 0.05MPa.
4. the preparation method of mineral insulated cable porcelain knob as claimed in claim 1 is characterized in that, in the preparation method's of described binding agent the step (1), the pressure of the reaction environment that described etherificate is processed is less than or equal to 0.15MPa.
5. the preparation method of mineral insulated cable porcelain knob as claimed in claim 1 or 2 is characterized in that, in the described step 1, described mineral insulated cable porcelain knob prepares by the following method with magnesium oxide:
Step (1) obtains light calcined magnesia to the temperature lower calcination of raw material magnesium oxide at 1100～1200 ℃;
The light calcined magnesia that step (2) adopts described step (1) to obtain makes the light calcined magnesia of two kinds of particle diameters, is respectively particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias;
Step (3) is mixed particle diameter greater than 150 orders and 80～150 purpose light calcined magnesias, obtain mineral insulated cable porcelain knob magnesium oxide, wherein, particle diameter is 3～5% of mineral insulated cable porcelain knob usefulness magnesium oxide total amount greater than the consumption of 150 purpose light calcined magnesias.
6. the preparation method of mineral insulated cable porcelain knob as claimed in claim 5, it is characterized in that, described mineral insulated cable porcelain knob is with in the step among the magnesian preparation method (1), and raw material magnesium oxide obtains by the following method: the screening diameter is less than the raw material magnesium oxide of 8mm from magnesite tailings.
7. the preparation method of mineral insulated cable porcelain knob as claimed in claim 6 is characterized in that, described mineral insulated cable porcelain knob is 1.5～1.7g/cm with the density of the light calcined magnesia that the step among the magnesian preparation method (1) obtains
3
8. the preparation method of mineral insulated cable porcelain knob as claimed in claim 5 is characterized in that, in the described step 2, the binding agent of described step 1 preparation is water-soluble with 2～3% ratio of magnesian quality according to the mineral insulated cable porcelain knob.
9. the preparation method of mineral insulated cable porcelain knob as claimed in claim 7 is characterized in that, in the described step 3, the magnesium oxide particle that described step 2 obtains is suppressed under the pressure of setting, so that the density of porcelain knob is 2.1～2.3g/cm
3
10. the preparation method of mineral insulated cable porcelain knob as claimed in claim 5 is characterized in that, in the described step 4, calcining temperature is 750 ℃.
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| CN103524120A (en) * | 2013-08-09 | 2014-01-22 | 上海胜华电气股份有限公司 | Magnesium oxide knob insulator and preparation method thereof |
| CN104464894A (en) * | 2014-12-15 | 2015-03-25 | 重庆科宝电缆股份有限公司 | Fire-resistant insulated cable containing calcined coal series kaolin |
| CN108726993A (en) * | 2018-06-05 | 2018-11-02 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable ceramics pole |
| CN108793972A (en) * | 2018-06-05 | 2018-11-13 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable Magnesium oxide knob insulator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103524120A (en) * | 2013-08-09 | 2014-01-22 | 上海胜华电气股份有限公司 | Magnesium oxide knob insulator and preparation method thereof |
| CN104464894A (en) * | 2014-12-15 | 2015-03-25 | 重庆科宝电缆股份有限公司 | Fire-resistant insulated cable containing calcined coal series kaolin |
| CN108726993A (en) * | 2018-06-05 | 2018-11-02 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable ceramics pole |
| CN108793972A (en) * | 2018-06-05 | 2018-11-13 | 博侃电气（合肥）有限公司 | A kind of preparation method of mineral insulated cable Magnesium oxide knob insulator |
| CN108793972B (en) * | 2018-06-05 | 2021-08-06 | 博侃电气（合肥）有限公司 | Preparation method of mineral insulated cable magnesium oxide knob insulator |
| CN108726993B (en) * | 2018-06-05 | 2021-08-06 | 博侃电气（合肥）有限公司 | Preparation method of mineral insulated cable ceramic column |
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| CN102850053B (en) | 2014-07-16 |
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