High-temperature-resistant quartz roller for glass toughening furnace and preparation method thereof

Abstract

This invention proposes a high-temperature resistant quartz roller for glass tempering furnaces and its preparation method. The high-temperature resistant quartz roller includes a quartz roller body and a high-temperature resistant coating covering the surface of the quartz roller body. The high-temperature resistant coating comprises, by weight, 100 parts of alumina powder, 20-40 parts of silica powder, 15-25 parts of basalt fiber, and 3-7 parts of binder. This invention provides a high-temperature resistant quartz roller for glass tempering furnaces and its preparation method, which, by forming a high-temperature resistant coating composed of inorganic oxides and basalt fiber on the surface of the quartz roller, enables the quartz roller to achieve the advantages of high strength and low high-temperature deformation.

Description

Technical Field

[0001] This invention relates to the field of glass tempering production technology, and in particular to a high-temperature resistant quartz roller for a glass tempering furnace and its preparation method. Background Technology

[0002] A glass tempering furnace is an industrial heating device. Glass is conveyed and heated within the furnace via quartz rollers. The principle of tempering glass is that it needs to be heated to near its melting point in the furnace and then rapidly cooled to achieve the required stress for tempering. However, because the glass is in direct contact with the quartz rollers during the heating process, and crystals continuously overflow from the surface of the quartz rollers at temperatures above 650°C, this can easily lead to defects and flaws on the surface of the tempered glass.

[0003] Basalt fiber possesses excellent mechanical properties, high resistance to chemical media, and the ability to be used over a wide temperature range, making it a potential high-performance material. Therefore, using basalt fiber to reinforce quartz rollers could potentially overcome the limitation of quartz rollers being unusable at high temperatures. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a high-temperature resistant quartz roller for glass tempering furnace and its preparation method. By forming a high-temperature resistant coating composed of inorganic oxides and basalt fibers on the surface of the quartz roller, the quartz roller obtains the advantages of high strength and small high-temperature deformation.

[0005] The present invention proposes a high-temperature resistant quartz roller for a glass tempering furnace, comprising a quartz roller body and a high-temperature resistant coating covering the surface of the quartz roller body;

[0006] The high-temperature resistant coating comprises, by weight: 100 parts alumina powder, 20-40 parts silica powder, 15-25 parts basalt fiber, and 3-7 parts binder.

[0007] In this invention, a high-temperature resistant coating is formed on the surface of the quartz roller body. This high-temperature resistant coating is based on inorganic oxide powder containing alumina and silicon oxide, with the addition of basalt fiber. When sintered at high temperature, the basalt fiber and the inorganic oxide powder can form an interlocking network structure, which ensures that the coating still maintains good dimensional stability under high temperature conditions. Its high-temperature resistance and strength performance are both guaranteed.

[0008] Preferably, the quartz roller body is prepared by sintering quartz sand with a purity higher than 99.9%.

[0009] Preferably, the alumina powder has a particle size of 0.5-10 μm and a purity higher than 99.9%.

[0010] Preferably, the silica powder has a particle size of 0.5-10 μm and a purity higher than 99.9%.

[0011] Preferably, the basalt fiber is silica-coated basalt fiber;

[0012] Preferably, the silica-coated basalt fiber is formed by grafting an aminosilane coupling agent onto the surface of the basalt fiber and then mixing and curing it with silica sol.

[0013] In this invention, by grafting an aminosilane coupling agent onto the surface of basalt fiber, the surface of the basalt fiber becomes amino. When mixed with silica sol, the amino group reacts with the silanol group of the silica sol, thereby allowing the silica gel to adhere firmly to the surface of the basalt fiber. This not only improves the adhesion between the silica gel and the basalt fiber, but also, after curing, effectively coats the surface of the basalt fiber with silica, thereby further improving the temperature resistance of the basalt fiber. It also increases the wetting and entanglement effect of the basalt fiber with the inorganic oxide powders of alumina and silica, further improving the temperature resistance and strength of the resulting coating.

[0014] Preferably, the basalt fiber has a length of 10-100 μm and an aspect ratio of 5-10; the aminosilane coupling agent is 3-aminopropyltrimethoxysilane or 3-(2-aminoethylamino)propyltrimethoxysilane; and the silica sol contains 20-25 wt% silica.

[0015] Preferably, the adhesive is polyamic acid;

[0016] Preferably, the polyamic acid is formed by polycondensation of a rigid diacid anhydride and a flexible diamine;

[0017] Preferably, the rigid dicarboxylic acid anhydride is at least one of pyromellitic dianhydride, 1,4,5,8-naphthalenetetracarboxylic anhydride, 3,3',4,4'-diphenylsulfonetetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, or 3,3',4,4'-benzophenonetetracarboxylic dianhydride, and the flexible diamine is at least one of 1,3-bis(4'-aminophenoxy)benzene, 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 4,4'-diaminodiphenyl ether, or 2,2-bis[4-(4-aminophenoxy)phenyl]propane.

[0018] In this invention, polyamic acid is used as a binder. Its polyimide segments provide excellent high-temperature resistance and can still act as a binder during high-temperature sintering, promoting the effective formation of a high-temperature resistant coating to obtain better thermal stability and high-temperature resistance.

[0019] This invention also proposes a method for preparing a high-temperature resistant quartz roller for a glass tempering furnace, comprising the following steps:

[0020] S1. Provide the quartz roller body;

[0021] S2. Mix 100 parts by weight of alumina powder, 20-40 parts by weight of silica powder, 15-25 parts by weight of basalt fiber, 3-7 parts by weight of binder and 4-10 parts by weight of water, and ball mill to obtain a mixed slurry.

[0022] S3. The mixed slurry is coated onto the surface of the quartz roller body, dried, and sintered to obtain the high-temperature resistant quartz roller for glass tempering furnace.

[0023] Preferably, the ball milling rate is 50-200 rpm and the ball milling time is 6-12 h.

[0024] Preferably, the drying temperature is 60-80℃ and the drying time is 5-10 hours;

[0025] Preferably, the sintering process includes: heating to 500-600°C at a rate of 1-3°C / min and holding at that temperature for 1-3 hours, then heating to 1200-1300°C at a rate of 2-4°C / min and holding at that temperature for 3-5 hours.

[0026] This invention provides a high-temperature resistant quartz roller for glass tempering furnaces and its preparation method. By forming a high-temperature resistant coating on the surface of a conventional quartz roller body, the quartz roller body is protected, and the high-temperature resistance and strength performance of the quartz roller are improved. Detailed Implementation

[0027] The technical solution of the present invention will be described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0028] Example 1

[0029] A high-temperature resistant quartz roller for a glass tempering furnace, the preparation method of which includes:

[0030] (1) High-purity quartz sand (purity higher than 99.9%, average particle size D50 of 15μm) is slurry molded to obtain the quartz roller body;

[0031] (2) Mix 100 parts by weight of alumina powder (purity higher than 99.9%, average particle size D50 of 5μm), 30 parts by weight of silica powder (purity higher than 99.9%, average particle size D50 of 5μm), 20 parts by weight of basalt fiber (average length of 30μm, average aspect ratio of 3), 25 parts by weight of polyamic acid solution and 12 parts by weight of deionized water, add the mixture to a ball mill and ball mill for 8 hours. Zirconia balls are used as the ball milling medium during ball milling, and the ball milling speed is 100 rpm to obtain a mixed slurry.

[0032] The polyamic acid solution is prepared by the following method: 1,3-bis(4'-aminophenoxy)benzene and pyromellitic dianhydride are added to N-methylpyrrolidone (NMP) in a molar ratio of 1:1 and stirred until completely dissolved. After stirring and reacting for 4 hours under nitrogen protection, a polyamic acid solution with a content of 20 wt% is obtained.

[0033] (3) The mixed slurry is coated on the surface of the quartz roller body, and then dried naturally at room temperature and in a shaded place for 12 hours. Then it is dried at 60°C for 8 hours. Next, the temperature is increased to 550°C at a rate of 2°C / min and held for 2 hours. Then the temperature is increased to 1250°C at a rate of 3°C / min and held for 4 hours. After natural cooling, a high-temperature resistant quartz roller for glass tempering furnace is obtained.

[0034] Example 2

[0035] A high-temperature resistant quartz roller for a glass tempering furnace, the preparation method of which includes:

[0036] (1) High-purity quartz sand (purity higher than 99.9%, average particle size D50 of 15μm) is slurry molded to obtain the quartz roller body;

[0037] (2) Mix 100 parts by weight of alumina powder (purity higher than 99.9%, average particle size D50 of 5μm), 20 parts by weight of silica powder (purity higher than 99.9%, average particle size D50 of 5μm), 25 parts by weight of basalt fiber (average length of 30μm, average aspect ratio of 3), 15 parts by weight of polyamic acid solution and 15 parts by weight of deionized water, add the mixture to a ball mill and ball mill for 12 hours. Zirconia balls are used as the ball milling medium during ball milling, and the ball milling rate is 50 rpm to obtain a mixed slurry.

[0038] The polyamic acid solution was prepared by the following method: 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane and 1,4,5,8-naphthalenetetracarboxylic anhydride were added to N-methylpyrrolidone (NMP) at a molar ratio of 1:1 and stirred until completely dissolved. After stirring and reacting for 4 hours under nitrogen protection, a polyamic acid solution with a content of 20 wt% was obtained.

[0039] (3) The mixed slurry is coated on the surface of the quartz roller body, and then dried naturally at room temperature and in a shaded place for 12 hours. Then it is dried at 80°C for 5 hours. Next, the temperature is increased to 600°C at a rate of 1°C / min and held for 1 hour. Then the temperature is increased to 1200°C at a rate of 4°C / min and held for 5 hours. After natural cooling, a high-temperature resistant quartz roller for glass tempering furnace is obtained.

[0040] Example 3

[0041] A high-temperature resistant quartz roller for a glass tempering furnace, the preparation method of which includes:

[0042] (1) High-purity quartz sand (purity higher than 99.9%, average particle size D50 of 15μm) is slurry molded to obtain the quartz roller body;

[0043] (2) Mix 100 parts by weight of alumina powder (purity higher than 99.9%, average particle size D50 of 5μm), 40 parts by weight of silica powder (purity higher than 99.9%, average particle size D50 of 5μm), 15 parts by weight of basalt fiber (average length of 30μm, average aspect ratio of 3), 35 parts by weight of polyamic acid solution and 5 parts by weight of deionized water, add the mixture to a ball mill and ball mill for 6 hours. Zirconia balls are used as the ball milling medium during ball milling, and the ball milling speed is 200 rpm to obtain a mixed slurry.

[0044] The polyamic acid solution is prepared by the following method: 4,4'-diaminodiphenyl ether and 3,3',4,4'-biphenyltetracarboxylic dianhydride are added to N-methylpyrrolidone (NMP) at a molar ratio of 1:1 and stirred until completely dissolved. After stirring and reacting for 4 hours under nitrogen protection, a polyamic acid solution with a content of 20 wt% is obtained.

[0045] (3) The mixed slurry is coated on the surface of the quartz roller body, and then dried naturally at room temperature and in a shaded place for 12 hours. Then it is dried at 70°C for 10 hours. Next, the temperature is increased to 500°C at a rate of 3°C / min and held for 3 hours. Then the temperature is increased to 1300°C at a rate of 2°C / min and held for 3 hours. After natural cooling, a high-temperature resistant quartz roller for glass tempering furnace is obtained.

[0046] Example 4

[0047] A high-temperature resistant quartz roller for a glass tempering furnace, the preparation method of which includes:

[0048] (1) High-purity quartz sand (purity higher than 99.9%, average particle size D50 of 15μm) is slurry molded to obtain the quartz roller body;

[0049] (2) Mix 100 parts by weight of alumina powder (purity higher than 99.9%, average particle size D50 of 5μm), 30 parts by weight of silica powder (purity higher than 99.9%, average particle size D50 of 5μm), 20 parts by weight of silica-coated basalt fiber, 25 parts by weight of polyamic acid solution and 12 parts by weight of deionized water, add the mixture to a ball mill and ball mill for 8 hours. Zirconia balls are used as the ball milling medium and the ball milling speed is 100 rpm to obtain a mixed slurry.

[0050] The silica-coated basalt fiber is prepared by the following method: basalt fiber (average length 30 μm, average aspect ratio 3) is added to an acetic acid solution (acetic acid content 0.05 wt%) containing 0.5 wt% 3-aminopropyltrimethoxysilane, and ultrasonically reacted at 60°C for 2 h. After filtration and drying, basalt fiber with surface grafted aminosilane coupling agent is obtained. Tetraethyl orthosilicate is dissolved completely in anhydrous ethanol, and then an aqueous nitric acid solution is added, with the amount of nitric acid being 1 times the molar amount of tetraethyl orthosilicate. The mixture is heated to 40°C and stirred for 2 h to obtain a silica sol with a silica content of 25 wt%. The basalt fiber with surface grafted aminosilane coupling agent is added to the silica sol and mixed evenly, with a mass ratio of basalt fiber to silica sol of 1:0.6. After drying, it is cured at 200°C for 24 h to obtain silica-coated basalt fiber.

[0051] The polyamic acid solution is prepared by the following method: 1,3-bis(4'-aminophenoxy)benzene and pyromellitic dianhydride are added to N-methylpyrrolidone (NMP) in a molar ratio of 1:1 and stirred until completely dissolved. After stirring and reacting for 4 hours under nitrogen protection, a polyamic acid solution with a content of 20 wt% is obtained.

[0052] (3) The mixed slurry is coated on the surface of the quartz roller body, and then dried naturally at room temperature and in a shaded place for 12 hours. Then it is dried at 60°C for 8 hours. Next, the temperature is increased to 550°C at a rate of 2°C / min and held for 2 hours. Then the temperature is increased to 1250°C at a rate of 3°C / min and held for 4 hours. After natural cooling, a high-temperature resistant quartz roller for glass tempering furnace is obtained.

[0053] Comparative Example 1

[0054] A high-temperature resistant quartz roller for a glass tempering furnace, the preparation method of which includes:

[0055] (1) High-purity quartz sand (purity higher than 99.9%, average particle size D50 of 15μm) is slurry molded to obtain the quartz roller body;

[0056] (2) Mix 100 parts by weight of alumina powder (purity higher than 99.9%, average particle size D50 of 5μm), 30 parts by weight of silica powder (purity higher than 99.9%, average particle size D50 of 5μm), 25 parts by weight of polyamic acid solution and 12 parts by weight of deionized water, add the mixture to a ball mill and ball mill for 8 hours. Zirconia balls are used as the ball milling medium during ball milling, and the ball milling speed is 100 rpm to obtain a mixed slurry.

[0057] The polyamic acid solution is prepared by the following method: 1,3-bis(4'-aminophenoxy)benzene and pyromellitic dianhydride are added to N-methylpyrrolidone (NMP) in a molar ratio of 1:1 and stirred until completely dissolved. After stirring and reacting for 4 hours under nitrogen protection, a polyamic acid solution with a content of 20 wt% is obtained.

[0058] (3) The mixed slurry is coated on the surface of the quartz roller body, and then dried naturally at room temperature and in a shaded place for 12 hours. Then it is dried at 60°C for 8 hours. Next, the temperature is increased to 550°C at a rate of 2°C / min and held for 2 hours. Then the temperature is increased to 1250°C at a rate of 3°C / min and held for 4 hours. After natural cooling, a high-temperature resistant quartz roller for glass tempering furnace is obtained.

[0059] Comparative Example 2

[0060] A high-temperature resistant quartz roller for a glass tempering furnace, the preparation method of which includes:

[0061] (1) High-purity quartz sand (purity higher than 99.9%, average particle size D50 of 15μm) is slurry molded to obtain the quartz roller body;

[0062] (2) Mix 100 parts by weight of alumina powder (purity higher than 99.9%, average particle size D50 of 5μm), 30 parts by weight of silica powder (purity higher than 99.9%, average particle size D50 of 5μm), 20 parts by weight of basalt fiber (average length of 30μm, average aspect ratio of 3), 5 parts by weight of carboxymethyl cellulose fiber and 12 parts by weight of deionized water, add the mixture to a ball mill and ball mill for 8 hours. Zirconia balls are used as the ball milling medium and the ball milling speed is 100 rpm to obtain a mixed slurry.

[0063] (3) The mixed slurry is coated on the surface of the quartz roller body, and then dried naturally at room temperature and in a shaded place for 12 hours. Then it is dried at 60°C for 8 hours. Next, the temperature is increased to 550°C at a rate of 2°C / min and held for 2 hours. Then the temperature is increased to 1250°C at a rate of 3°C / min and held for 4 hours. After natural cooling, a high-temperature resistant quartz roller for glass tempering furnace is obtained.

[0064] Comparative Example 3

[0065] A high-temperature resistant quartz roller for a glass tempering furnace, the preparation method of which includes:

[0066] (1) High-purity quartz sand (purity higher than 99.9%, average particle size D50 of 15μm) is slurry molded to obtain the quartz roller body;

[0067] (2) Mix 100 parts by weight of alumina powder (purity higher than 99.9%, average particle size D50 of 5μm), 30 parts by weight of silica powder (purity higher than 99.9%, average particle size D50 of 5μm), 20 parts by weight of silica-coated basalt fiber, 25 parts by weight of polyamic acid solution and 12 parts by weight of deionized water, add the mixture to a ball mill and ball mill for 8 hours. Zirconia balls are used as the ball milling medium and the ball milling speed is 100 rpm to obtain a mixed slurry.

[0068] The silica-coated basalt fiber is prepared by the following method: tetraethyl orthosilicate is dissolved completely in anhydrous ethanol, and then an aqueous nitric acid solution is added, with the amount of nitric acid being 1 times the molar amount of tetraethyl orthosilicate. The mixture is heated to 40°C and stirred for 2 hours to obtain a silica sol with a silica content of 25 wt%. Basalt fiber (average length 30 μm, average aspect ratio 3) is added to the silica sol and mixed evenly, with a mass ratio of basalt fiber to silica sol of 1:0.6. After drying, the mixture is cured at 200°C for 24 hours to obtain silica-coated basalt fiber.

[0069] The polyamic acid solution is prepared by the following method: 1,3-bis(4'-aminophenoxy)benzene and pyromellitic dianhydride are added to N-methylpyrrolidone (NMP) in a molar ratio of 1:1 and stirred until completely dissolved. After stirring and reacting for 4 hours under nitrogen protection, a polyamic acid solution with a content of 20 wt% is obtained.

[0070] (3) The mixed slurry is coated on the surface of the quartz roller body, and then dried naturally at room temperature and in a shaded place for 12 hours. Then it is dried at 60°C for 8 hours. Next, the temperature is increased to 550°C at a rate of 2°C / min and held for 2 hours. Then the temperature is increased to 1250°C at a rate of 3°C / min and held for 4 hours. After natural cooling, a high-temperature resistant quartz roller for glass tempering furnace is obtained.

[0071] The compressive strength of the high-temperature resistant quartz rollers obtained in the examples and comparative examples was tested according to standard GB / T4740-1999, and the flexural strength was tested according to standard GB / T 4741-1999. The specific results are shown in Table 1 below:

[0072] Table 1 shows the performance results of the high-temperature resistant quartz rollers described in the examples and comparative examples.

[0073]

[0074]

[0075] As can be seen from the table above, the quartz roller described in the examples has the advantages of high strength and low high-temperature deformation. In contrast, the quartz roller in the comparative example is less effective. Furthermore, as can be seen from Comparative Example 3, even if basalt fibers are coated with silica, if the basalt fibers are not modified beforehand with an aminosilane coupling agent, the improvement effect of the silica-coated basalt fibers on the performance of the quartz roller is very limited compared to the uncoated basalt fibers. This may be because if the basalt fibers are not modified beforehand with an aminosilane coupling agent, silica cannot effectively coat the basalt fibers.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature resistant quartz roller for a glass tempering furnace, characterized in that, Includes a quartz roller body and a high-temperature resistant coating covering the surface of the quartz roller body; The high-temperature resistant coating comprises, by weight: 100 parts alumina powder, 20-40 parts silica powder, 15-25 parts basalt fiber, and 3-7 parts binder. The basalt fiber is silica-coated basalt fiber; the silica-coated basalt fiber is formed by grafting an aminosilane coupling agent onto the surface of the basalt fiber and then mixing and curing it with silica sol.

2. The high-temperature resistant quartz roller for glass tempering furnace according to claim 1, characterized in that, The quartz roller body is formed by sintering quartz sand with a purity of higher than 99.9%.

3. The high-temperature resistant quartz roller for a glass tempering furnace according to claim 1 or 2, characterized in that, The alumina powder has a particle size of 0.1-10 μm and a purity higher than 99.9%.

4. The high-temperature resistant quartz roller for a glass tempering furnace according to claim 1 or 2, characterized in that, The silica powder has a particle size of 0.1-10 μm and a purity higher than 99.9%.

5. The high-temperature resistant quartz roller for a glass tempering furnace according to claim 1, characterized in that, The basalt fibers have a length of 10-100 μm and an aspect ratio of 5-10; the aminosilane coupling agent is 3-aminopropyltrimethoxysilane or 3-(2-aminoethylamino)propyltrimethoxysilane; the silica sol contains 20-25 wt% silica.

6. The high-temperature resistant quartz roller for a glass tempering furnace according to claim 1 or 2, characterized in that, The adhesive is polyamic acid.

7. The high-temperature resistant quartz roller for a glass tempering furnace according to claim 6, characterized in that, The polyamic acid is formed by the polycondensation of a rigid diacid anhydride and a flexible diamine. The rigid dicarboxylic acid anhydride is at least one of pyromellitic dianhydride, 1,4,5,8-naphthalenetetracarboxylic anhydride, 3,3',4,4'-diphenylsulfonetetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, or 3,3',4,4'-benzophenonetetracarboxylic dianhydride, and the flexible diamine is at least one of 1,3-bis(4'-aminophenoxy)benzene, 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 4,4'-diaminodiphenyl ether, or 2,2-bis[4-(4-aminophenoxy)phenyl]propane.

8. A method for preparing a high-temperature resistant quartz roller for a glass tempering furnace according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Provide the quartz roller body; S2. Mix 100 parts by weight of alumina powder, 20-40 parts by weight of silica powder, 15-25 parts by weight of basalt fiber, 3-7 parts by weight of binder and 6-17 parts by weight of water, and ball mill to obtain a mixed slurry. S3. The mixed slurry is coated onto the surface of the quartz roller body, dried, and sintered to obtain the high-temperature resistant quartz roller for glass tempering furnace.

9. The method for preparing a high-temperature resistant quartz roller for a glass tempering furnace according to claim 8, characterized in that, The ball milling rate is 50-200 rpm, and the ball milling time is 6-12 h.

10. The method for preparing a high-temperature resistant quartz roller for a glass tempering furnace according to claim 8 or 9, characterized in that, The drying temperature is 60-80℃, and the time is 5-10 hours; The sintering process includes: heating to 500-600℃ at a rate of 1-3℃ / min and holding for 1-3 hours, then heating to 1200-1300℃ at a rate of 2-4℃ / min and holding for 3-5 hours.

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