CN104944909A - Thermal insulation ceramic bowl with low heat conductivity coefficient and preparation method thereof - Google Patents

Abstract

The invention discloses a thermal insulation ceramic bowl with low heat conductivity coefficient and a preparation method thereof. The thermal insulation ceramic bowl is prepared from the following raw materials, by weight, 27-39 parts of dolomite, 20-30 parts of spodumene, 16-24 parts of vermiculite, 13-21 parts of fluorite, 10-15 parts of asbestos wool, 15-25 parts of magnesite, 14-22 parts of pitchstone, 4-8 parts of alumina hollow microspheres, 7-14 parts of floating beads, 5-8 parts of poly(ethylene oxide), 3-6 parts of sodium humate, 2-4 parts of calcium stearyl lactylate, 4-7 parts of hydroxypropyl distarch phosphate and 6-9 parts of antimicrobial powder. The heat conductivity coefficient of the prepared ceramic bowl is less than 0.3W/m.K. As the heat conductivity coefficient is low and heat-insulating property is excellent, heat conduction between the ceramic bowl and a hand is greatly reduced. Thus, the problem that a previous ceramic bowl is easy to burn hands when holding high-temperature food is well solved.

Description

A kind of low thermal conductivity thermal insulation ceramics bowl and preparation method thereof

Technical field

The present invention relates to a kind of low thermal conductivity thermal insulation ceramics bowl and preparation method thereof, belong to stupalith field.

Background technology

Bowl is closely related as important component part and the daily life of life, is indispensable of paramount importance apparatus in diet activity, especially in China's use very extensively, is the requisite in Chinese ware.China from ancient times just the raw material such as useful china clay, quartz sand fire meticulous ceramic bowl, use till today as foods utensil and because of its practicality and taste.Even to this day, due to the progress of science and technology, many materials that can replace china bowl are there is, as stainless steel, plastics etc., compared with the bowl made with these materials, it is high that traditional ceramics bowl also also exists thermal conductivity, the shortcoming of thermal insulation difference, make the problem easily scalded one's hand during ceramic bowl splendid attire high temperature food, encounter larger challenge; Also there is the shortcoming of antibacterial bacteriostatic performance difference in ceramic bowl in the market in addition, easily grows a large amount of bacterium, be unfavorable for healthy diet and safety.Therefore, a kind of low thermal conductivity thermal insulation ceramics bowl of exploitation is badly in need of, to improve the performance of ceramic bowl.

Summary of the invention

The object of the present invention is to provide a kind of low thermal conductivity thermal insulation ceramics bowl and preparation method thereof, the thermal conduction between ceramic bowl and hand is greatly reduced, the problem easily scalded one's hand when solving ceramic bowl splendid attire high temperature food in the past well.

For achieving the above object, the technical solution used in the present invention is as follows:

A kind of low thermal conductivity thermal insulation ceramics bowl, is made up of the raw material of following weight part: white clouds soil 27-39, triphane 20-30, vermiculite 16-24, fluorite 13-21, asbestos wool 10-15, wagnerite 15-25, pitchstone 14-22, hollow aluminum oxide microspheres 4-8, drift pearl 7-14, polyethylene oxide 5-8, Sodium salts humic acids 3-6, CSL 2-4, hydroxypropyl Staragel 90V 4-7, nano-antibacterial powder 6-9;

The preparation method of described nano-antibacterial powder is as follows: (1) gets the raw material of following weight part: jade powder 4-8, oyster shell whiting 3-6, tetrabutyl titanate 10-15, dehydrated alcohol 50-60, distilled water 2-3, Glacial acetic acid 8-12, Silver Nitrate 4-6, cupric nitrate 3-5; (2) tetrabutyl titanate is mixed with the dehydrated alcohol accounting for alcohol total amount 55-65%, magnetic agitation 20-30min, obtain mixed liquor A; (3) distilled water, Glacial acetic acid and remaining dehydrated alcohol are mixed, magnetic agitation 15-25min, obtains mixed liquid B; (4) under magnetic stirring, mixed liquid B is dropwise joined in mixed liquor A, after dripping, add jade powder and oyster shell whiting, ultrasonic agitation 0.5-1h, at room temperature leave standstill 24-48h again, by the gel dry 10-15h at 70-80 DEG C obtained, grind into powder; (5) above-mentioned obtained powder is put into retort furnace, at 450-550 DEG C, thermal treatment 1-2h, cools to normal temperature with the furnace, pulverizes, sieves and obtain required nano-antibacterial powder.

A preparation method for low thermal conductivity thermal insulation ceramics bowl, comprises the following steps:

(1) get white clouds soil, triphane, diabase, vermiculite, fluorite, wagnerite, pitchstone mix, pulverize, be soaked in 20% aqueous hydrogen peroxide solution of 5-8 times amount after crossing 100-150 mesh sieve, soak 1-2h, then under the rotating speed of 1000-1500r/min, grind 15-20min with colloidal mill, slurries after grinding are left standstill 0.5-1h at lower than the temperature of-10 DEG C, be placed in ultrasonication 35-45min under normal temperature again, filter, washes clean, dry, stand-by;

(2) powder getting asbestos wool, hollow aluminum oxide microspheres, drift pearl and step (1) obtained mixes, add appropriate water making beating and make the slurries that concentration is 40-50%, UV-irradiation 1-2h, add remaining raw material again, heating in water bath is to 70-80 DEG C, under the rotating speed of 1000-1500r/min, grind 15-20min, then the slurry after grinding is put into mould by vacuum pressure injection forming, forming pressure is 24-28MPa;

(3) green compact that step (2) is obtained are carried out drying at the temperature of 50-60 DEG C, be dried to blank water content lower than 3%;

(4) be placed in HIP sintering stove by dry body obtained above and process, using nitrogen as pressure medium, pressurization 80-120MPa, is warming up to 1200-1250 DEG C, and insulation 1-2h, cools to normal temperature with the furnace;

(5) carry out colored drawing to the dry body after above-mentioned HIP sintering, then carry out glazing, then carry out gas pressure sintering process: be warming up to 520-580 DEG C first under vacuum conditions, insulation 0.5-1h, then at the N of 1-2MPa ₂be warming up to 810-860 DEG C under atmosphere, insulation 1-2h, then be warming up to 1160-1240 DEG C under the Ar atmosphere of 2-3MPa, insulation 1.5-2.5h, is finally cooled to 640-720 DEG C under vacuum conditions, and insulation 0.5-1h, furnace cooling normal temperature, packaging gets product.

Above-mentioned nano-antibacterial powder is with jade powder, oyster shell whiting for carrier, with Ag ⁺, Cu ²⁺for the modified Nano TiO that doping particle prepares ₂powder, safety and environmental protection, nontoxic, tasteless, nonirritant, not only there is excellent broad spectrum antibacterial performance, to comprise bacterium, fungi, mycoplasma multiple pathogens have and well suppress or killing action, sterilizing rate reaches more than 98%, also has good anti-ultraviolet aging and thermotolerance, does not decompose, non-volatile, nondiscoloration, to never degenerate under high temperature and intensive ultraviolet.

Beneficial effect of the present invention:

In the present invention, vermiculite and pitchstone two kinds of raw materials cooperatively interact, can undergoes rapid expansion in pyroprocessing lower volume, there is very strong heat-proof quality, significantly can reduce the thermal conductivity of ceramic bowl, the asbestos wool simultaneously added, hollow aluminum oxide microspheres and drift pearl, not only can improve the heat-proof quality of ceramic bowl, the chemical stability of ceramic tile, high thermal resistance and withstand voltage properties can also be improved.The ceramic bowl thermal conductivity that the present invention obtains is less than 0.3W/mK, and thermal conductivity is low, and heat-proof quality is excellent, the thermal conduction between ceramic bowl and hand is greatly reduced, the problem easily scalded one's hand when solving ceramic bowl splendid attire high temperature food in the past well.

Embodiment

A kind of low thermal conductivity thermal insulation ceramics bowl, is made up of the raw material of following weight (kg): white clouds soil 33, triphane 25, vermiculite 22, fluorite 17, asbestos wool 12, wagnerite 20, pitchstone 18, hollow aluminum oxide microspheres 6, drift pearl 11, polyethylene oxide 7, Sodium salts humic acids 4, CSL 3, hydroxypropyl Staragel 90V 5, nano-antibacterial powder 7;

The preparation method of described nano-antibacterial powder is as follows: (1) gets the raw material of following weight (kg): jade powder 5, oyster shell whiting 5, tetrabutyl titanate 11, dehydrated alcohol 56, distilled water 2.5, Glacial acetic acid 9, Silver Nitrate 5, cupric nitrate 4; (2) tetrabutyl titanate is mixed with the dehydrated alcohol accounting for alcohol total amount 55%, magnetic agitation 20min, obtain mixed liquor A; (3) distilled water, Glacial acetic acid and remaining dehydrated alcohol are mixed, magnetic agitation 20min, obtains mixed liquid B; (4) under magnetic stirring, mixed liquid B is dropwise joined in mixed liquor A, add jade powder and oyster shell whiting after dripping, ultrasonic agitation 0.5h, more at room temperature leave standstill 24h, by the gel dry 10h at 80 DEG C obtained, grind into powder; (5) above-mentioned obtained powder is put into retort furnace, at 550 DEG C, thermal treatment 1h, cools to normal temperature with the furnace, pulverizes, sieves and obtain required nano-antibacterial powder.

A preparation method for low thermal conductivity thermal insulation ceramics bowl, comprises the following steps:

(1) get white clouds soil, triphane, diabase, vermiculite, fluorite, wagnerite, pitchstone mix, pulverize, be soaked in 20% aqueous hydrogen peroxide solution of 7 times amount after crossing 150 mesh sieves, soak 1.5h, then under the rotating speed of 1500r/min, grind 15min with colloidal mill, slurries after grinding are left standstill 1h at lower than the temperature of-10 DEG C, be placed in ultrasonication 35min under normal temperature again, filter, washes clean, dry, stand-by;

(2) powder getting asbestos wool, hollow aluminum oxide microspheres, drift pearl and step (1) obtained mixes, add appropriate water making beating and make the slurries that concentration is 50%, UV-irradiation 2h, add remaining raw material again, heating in water bath to 80 DEG C, under the rotating speed of 1000r/min, grind 20min, then the slurry after grinding is put into mould by vacuum pressure injection forming, forming pressure is 26MPa;

(3) green compact that step (2) is obtained are carried out drying at the temperature of 60 DEG C, be dried to blank water content lower than 3%;

(4) be placed in HIP sintering stove by dry body obtained above and process, using nitrogen as pressure medium, pressurization 100MPa, is warming up to 1220 DEG C, and insulation 1.5h, cools to normal temperature with the furnace;

(5) carry out colored drawing to the dry body after above-mentioned HIP sintering, then carry out glazing, then carry out gas pressure sintering process: be warming up to 560 DEG C first under vacuum conditions, insulation 0.5h, then at the N of 1.5MPa ₂be warming up to 840 DEG C under atmosphere, insulation 1h, then be warming up to 1240 DEG C under the Ar atmosphere of 2MPa, insulation 2h, is finally cooled to 690 DEG C under vacuum conditions, and insulation 0.5h, furnace cooling normal temperature, packaging gets product.

The ceramic bowl salient features that above-described embodiment is produced is as shown in the table:

Project	Unit	Detected result
			Strength at break	N	1272
The modulus of rupture	MPa	32
			Thermal conductivity	W/m·K	0.19
Sterilizing rate	％	98.6

Claims (2)

1. a low thermal conductivity thermal insulation ceramics bowl, it is characterized in that, be made up of the raw material of following weight part: white clouds soil 27-39, triphane 20-30, vermiculite 16-24, fluorite 13-21, asbestos wool 10-15, wagnerite 15-25, pitchstone 14-22, hollow aluminum oxide microspheres 4-8, drift pearl 7-14, polyethylene oxide 5-8, Sodium salts humic acids 3-6, CSL 2-4, hydroxypropyl Staragel 90V 4-7, nano-antibacterial powder 6-9;

The preparation method of described nano-antibacterial powder is as follows: (1) gets the raw material of following weight part: jade powder 4-8, oyster shell whiting 3-6, tetrabutyl titanate 10-15, dehydrated alcohol 50-60, distilled water 2-3, Glacial acetic acid 8-12, Silver Nitrate 4-6, cupric nitrate 3-5; (2) tetrabutyl titanate is mixed with the dehydrated alcohol accounting for alcohol total amount 55-65%, magnetic agitation 20-30min, obtain mixed liquor A; (3) distilled water, Glacial acetic acid and remaining dehydrated alcohol are mixed, magnetic agitation 15-25min, obtains mixed liquid B; (4) under magnetic stirring, mixed liquid B is dropwise joined in mixed liquor A, add jade powder and oyster shell whiting after dripping, ultrasonic agitation 0.5-1h, more at room temperature leave standstill 24-48h, by the gel dry 10-15h at 70-80 DEG C obtained, grind into powder; (5) above-mentioned obtained powder is put into retort furnace, at 450-550 DEG C, thermal treatment 1-2h, cools to normal temperature with the furnace, pulverizes, sieves and obtain required nano-antibacterial powder.

2. a preparation method for low thermal conductivity thermal insulation ceramics bowl as claimed in claim 1, is characterized in that comprising the following steps:

(1) get white clouds soil, triphane, diabase, vermiculite, fluorite, wagnerite, pitchstone mix, pulverize, be soaked in 20% aqueous hydrogen peroxide solution of 5-8 times amount after crossing 100-150 mesh sieve, soak 1-2h, then under the rotating speed of 1000-1500r/min, grind 15-20min with colloidal mill, slurries after grinding are left standstill 0.5-1h at lower than the temperature of-10 DEG C, be placed in ultrasonication 35-45min under normal temperature again, filter, washes clean, dry, stand-by;

(2) powder getting asbestos wool, hollow aluminum oxide microspheres, drift pearl and step (1) obtained mixes, add appropriate water making beating and make the slurries that concentration is 40-50%, UV-irradiation 1-2h, add remaining raw material again, heating in water bath is to 70-80 DEG C, under the rotating speed of 1000-1500r/min, grind 15-20min, then the slurry after grinding is put into mould by vacuum pressure injection forming, forming pressure is 24-28MPa;

(3) green compact that step (2) is obtained are carried out drying at the temperature of 50-60 DEG C, be dried to blank water content lower than 3%;

(4) be placed in HIP sintering stove by dry body obtained above and process, using nitrogen as pressure medium, pressurization 80-120MPa, is warming up to 1200-1250 DEG C, and insulation 1-2h, cools to normal temperature with the furnace;

(5) carry out colored drawing to the dry body after above-mentioned HIP sintering, then carry out glazing, then carry out gas pressure sintering process: be warming up to 520-580 DEG C first under vacuum conditions, insulation 0.5-1h, then at the N of 1-2MPa ₂be warming up to 810-860 DEG C under atmosphere, insulation 1-2h, then be warming up to 1160-1240 DEG C under the Ar atmosphere of 2-3MPa, insulation 1.5-2.5h, is finally cooled to 640-720 DEG C under vacuum conditions, and insulation 0.5-1h, furnace cooling normal temperature, packaging gets product.