A kind of corrosion-resistant polyurethane ceramic and preparation method thereof

Abstract

The invention relates to the technical field of polyurethane ceramics, and discloses a corrosion-resistant polyurethane ceramic and a preparation method thereof. The invention provides a method for preparing the corrosion-resistant polyurethane ceramic by adding epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a stirrer, stirring and mixing to obtain a mixture, then pouring the mixture into a ceramic embryo, cooling and obtaining the corrosion-resistant polyurethane ceramic. The triazole group and the carbamate obtained under the action of hexamethylene diisocyanate both have good corrosion resistance, and chitosan and polyurethane themselves have good corrosion resistance. During the process of adding and blending, the epoxy group in the epoxy bentonite reacts with the hydroxyl group in the modified polyurethane to cause a ring-opening reaction, so that the bentonite and the polyurethane are closely cross-linked and evenly distributed in the polyurethane ceramic, thereby further enhancing the corrosion resistance.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane ceramics, in particular to corrosion-resistant polyurethane ceramics and a preparation method thereof. Background Art

[0002] Ceramics is a general term for pottery and porcelain, and is also a kind of arts and crafts. In the past hundred years, many new types of ceramics have appeared, and traditional ceramic materials such as clay, feldspar, and quartz are rarely used. Ceramics will be invaded by microorganisms when placed in the outside world for a long time, causing corrosion. How to enhance the corrosion resistance of ceramics is the key to solving the problem. Bentonite is a common waterproof material with excellent weather resistance and corrosion resistance. It can achieve good corrosion resistance when applied to ceramics. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a corrosion-resistant polyurethane ceramic and a preparation method thereof, which has good corrosion resistance effect.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing corrosion-resistant polyurethane ceramics, the method for preparing corrosion-resistant polyurethane ceramics comprising the following steps:

[0007] (1) Add purified polyurethane particles to dimethylformamide solvent, stir and dissolve at 80-110°C for 6-12 hours, and then dry to obtain a polyurethane film; add methyl methacrylate isothiocyanate to the polyurethane film, pass nitrogen for protection, then add triethylamine, and oil bath at 40-60°C for 8-14 hours. After the reaction, wash with acetonitrile and dry to obtain olefinic polyurethane;

[0008] (2) Adding olefinated polyurethane and acryl alcohol to N,N-dimethylformamide solvent, stirring evenly, adding azobisisobutyronitrile initiator, reacting at 80-120°C for 6-12h, and after the reaction is completed, distilling under reduced pressure, filtering and drying to obtain hydroxylated polyurethane;

[0009] (3) adding chitosan to an ethanol solvent to dissolve it, adding epoxide at a constant pressure, heating in a water bath at 70-90° C., reacting for 6-12 hours, washing with anhydrous ethanol, drying, dialyzing, concentrating, and drying to obtain acetylated chitosan;

[0010] (4) adding acetylated chitosan and azidopropylamine to N,N-dimethylformamide solvent for dissolution, degassing by freezing for 3-4 times, adding cuprous bromide catalyst, introducing nitrogen protection, reacting at 60-80°C for 20-24h, washing with tetrahydrofuran, concentrating by rotary evaporation, dialyzing, and drying to obtain triazole-modified chitosan;

[0011] (5) adding hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane to N,N-dimethylacetamide, heating to 90-110°C for reaction for 8-12h, centrifuging, washing with acetone, and drying to obtain modified polyurethane;

[0012] (6) Add epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a blender, stir and mix at 80-110° C. for 3-5 hours to obtain a mixture, then pour the mixture into a ceramic embryo, cool it, and obtain corrosion-resistant polyurethane ceramics.

[0013] Preferably, the mass ratio of the polyurethane particles, methacrylate isothiocyanate, polyurethane film and triethylamine in (1) is 1.3-1.7:2.1-2.6:1:0.02-0.03.

[0014] Preferably, the mass ratio of olefinic polyurethane, acryl alcohol and azobisisobutyronitrile initiator in (2) is 1:1.3-1.6:0.1-0.4.

[0015] Preferably, the mass ratio of chitosan to ethylene oxide in (3) is 1.1-2.1:1.6-2.5.

[0016] Preferably, the mass ratio of acetylated chitosan, propylamine azido and cuprous bromide catalyst in (4) is 1.1-1.4:1:0.1-0.3.

[0017] Preferably, the mass ratio of hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane in (5) is 0.8-1.2:1:1.1-1.5.

[0018] Preferably, the mass ratio of epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone in (6) is 1.2-1.5:2.1-2.5:3.1-4.4:10-12:8-15.

[0019] 3. Beneficial technical effects

[0020] The invention provides the method of adding epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a stirrer, stirring and mixing to obtain a mixture, then pouring the mixture into a ceramic embryo, cooling and obtaining the corrosion-resistant polyurethane ceramic.

[0021] Methyl methacrylate isothiocyanate is added to the polyurethane membrane, and olefinic polyurethane is obtained under the action of triethylamine catalyst; then, hydroxylated polyurethane is obtained under the action of azobisisobutyronitrile initiator, and then reacted with triazole-modified chitosan under the action of hexamethylene diisocyanate to obtain modified polyurethane, wherein the triazole group and the carbamate obtained under the action of hexamethylene diisocyanate both have good corrosion resistance, and chitosan and polyurethane themselves have good corrosion resistance. During the blending process, the epoxy groups in epoxy bentonite will undergo a ring-opening reaction with the hydroxyl groups in the modified polyurethane, so that the bentonite and polyurethane are tightly cross-linked and evenly distributed in the polyurethane ceramic, further enhancing the corrosion resistance. DETAILED DESCRIPTION

[0022] The preparation method of epoxy bentonite is as follows: adding bentonite to a hydrochloric acid solution for acidification to obtain acid-modified bentonite and dispersing it in ethanol, adding KH560 and stirring for reaction, filtering, washing and drying to obtain KH560 modified bentonite.

[0023] Example 1

[0024] (1) Add purified polyurethane particles to dimethylformamide solvent, stir and dissolve at 80°C for 6 hours, and then dry to obtain a polyurethane film; add methyl methacrylate isothiocyanate to the polyurethane film, introduce nitrogen for protection, and then add triethylamine, wherein the mass ratio of polyurethane particles, methyl methacrylate isothiocyanate, polyurethane film, and triethylamine is 1.3:2.1:1:0.02, and the reaction is carried out at 40°C in an oil bath for 8 hours. After the reaction, the polyurethane is washed with acetonitrile and dried to obtain an olefinated polyurethane;

[0025] (2) Adding olefinic polyurethane and acryl alcohol to N,N-dimethylformamide solvent, stirring evenly, and then adding azobisisobutyronitrile initiator, wherein the mass ratio of olefinic polyurethane, acryl alcohol and azobisisobutyronitrile initiator is 1:1.3:0.1, reacting at 80°C for 6h, and after the reaction is completed, distilling under reduced pressure, filtering and drying to obtain hydroxylated polyurethane;

[0026] (3) adding chitosan to an ethanol solvent to dissolve it, adding ethylene oxide at a constant pressure, wherein the mass ratio of chitosan to ethylene oxide is 1.1:1.6, heating in a water bath at 70° C., reacting for 6 h, washing with anhydrous ethanol after the reaction, drying, dialyzing, concentrating, and drying to obtain acetylated chitosan;

[0027] (4) adding alkynyl chitosan and azidopropylamine to N,N-dimethylformamide solvent for dissolution, degassing for 3 times, adding cuprous bromide catalyst, wherein the mass ratio of alkynyl chitosan, azidopropylamine and cuprous bromide catalyst is 1.1:1:0.1, passing nitrogen protection, reacting at 60°C for 20h, washing with tetrahydrofuran, concentrating by rotary evaporation, dialyzing and drying to obtain triazole-modified chitosan;

[0028] (5) adding hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane to N,N-dimethylacetamide, wherein the mass ratio of hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane is 0.8:1:1.1, heating to 90°C for reaction for 8h, centrifuging, washing with acetone, and drying to obtain modified polyurethane;

[0029] (6) Add epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a blender, wherein the mass ratio of epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone is 1.2:2.1:3.1:10:8, stir and mix at 80°C for 3 h to obtain a mixture, then pour the mixture into a ceramic embryo, cool it, and obtain corrosion-resistant polyurethane ceramics.

[0030] Example 2

[0031] (1) Add purified polyurethane particles to dimethylformamide solvent, stir and dissolve at 110°C for 12 hours, and then dry to obtain a polyurethane film; add methyl methacrylate isothiocyanate to the polyurethane film, introduce nitrogen for protection, and then add triethylamine, wherein the mass ratio of polyurethane particles, methyl methacrylate isothiocyanate, polyurethane film, and triethylamine is 1.7:2.6:1:0.03, and the reaction is carried out at 60°C in an oil bath for 14 hours. After the reaction, wash with acetonitrile and dry to obtain an olefinated polyurethane;

[0032] (2) Adding olefinic polyurethane and acryl alcohol to N,N-dimethylformamide solvent, stirring evenly, and then adding azobisisobutyronitrile initiator, wherein the mass ratio of olefinic polyurethane, acryl alcohol and azobisisobutyronitrile initiator is 1:1.6:0.4, reacting at 120°C for 12 hours, and after the reaction is completed, distilling under reduced pressure, filtering and drying to obtain hydroxylated polyurethane;

[0033] (3) adding chitosan to an ethanol solvent to dissolve it, adding ethylene oxide at a constant pressure, wherein the mass ratio of chitosan to ethylene oxide is 2.1:2.5, heating in a water bath at 90° C., reacting for 12 h, washing with anhydrous ethanol after the reaction, drying, dialyzing, concentrating, and drying to obtain acetylated chitosan;

[0034] (4) adding alkynyl chitosan and azidopropylamine to N,N-dimethylformamide solvent for dissolution, degassing for 4 times, adding cuprous bromide catalyst, wherein the mass ratio of alkynyl chitosan, azidopropylamine and cuprous bromide catalyst is 1.4:1:0.3, passing nitrogen protection, reacting at 80°C for 24h, washing with tetrahydrofuran, concentrating by rotary evaporation, dialyzing and drying to obtain triazole-modified chitosan;

[0035] (5) adding hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane to N,N-dimethylacetamide, wherein the mass ratio of hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane is 1.2:1:1.5, heating to 110° C. for reaction for 12 h, centrifuging, washing with acetone, and drying to obtain modified polyurethane;

[0036] (6) Add epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a blender, wherein the mass ratio of epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone is 1.5:2.5:4.4:12:15, stir and mix at 110° C. for 5 h to obtain a mixture, then pour the mixture into a ceramic embryo, cool it, and obtain corrosion-resistant polyurethane ceramics.

[0037] Example 3

[0038] (1) Add purified polyurethane particles to dimethylformamide solvent, stir and dissolve at 95°C for 9 hours, and then dry to obtain a polyurethane film; add methyl methacrylate isothiocyanate to the polyurethane film, pass nitrogen for protection, and then add triethylamine, wherein the mass ratio of polyurethane particles, methyl methacrylate isothiocyanate, polyurethane film, and triethylamine is 1.5:2.35:1:0.025, and react at 50°C in an oil bath for 11 hours. After the reaction, wash with acetonitrile and dry to obtain an olefinated polyurethane;

[0039] (2) Adding olefinic polyurethane and acryl alcohol to N,N-dimethylformamide solvent, stirring evenly, and then adding azobisisobutyronitrile initiator, wherein the mass ratio of olefinic polyurethane, acryl alcohol and azobisisobutyronitrile initiator is 1:0.95:0.25, reacting at 100°C for 9h, and after the reaction is completed, distilling under reduced pressure, filtering and drying to obtain hydroxylated polyurethane;

[0040] (3) adding chitosan to an ethanol solvent to dissolve it, adding ethylene oxide at a constant pressure, wherein the mass ratio of chitosan to ethylene oxide is 1.6:2.05, heating in a water bath at 80° C., reacting for 9 h, washing with anhydrous ethanol after the reaction, drying, dialyzing, concentrating, and drying to obtain acetylated chitosan;

[0041] (4) adding alkynyl chitosan and azidopropylamine to N,N-dimethylformamide solvent for dissolution, degassing by freezing for 3.5 times, adding cuprous bromide catalyst, wherein the mass ratio of alkynyl chitosan, azidopropylamine and cuprous bromide catalyst is 1.25:1:0.2, passing nitrogen protection, reacting at 70°C for 22h, washing with tetrahydrofuran, concentrating by rotary evaporation, dialyzing and drying to obtain triazole-modified chitosan;

[0042] (5) adding hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane to N,N-dimethylacetamide, wherein the mass ratio of hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane is 1.0:1:1.3, heating to 100° C. and reacting for 10 h, centrifuging, washing with acetone, and drying to obtain modified polyurethane;

[0043] (6) Add epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a blender, wherein the mass ratio of epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone is 2.35:2.3:3.75:11:11.5, stir and mix at 95°C for 4 h to obtain a mixture, then pour the mixture into a ceramic embryo, cool it, and obtain corrosion-resistant polyurethane ceramics.

[0044] Example 4

[0045] (1) Add purified polyurethane particles to dimethylformamide solvent, stir and dissolve at 80°C for 6 hours, and then dry to obtain a polyurethane film; add methyl methacrylate isothiocyanate to the polyurethane film, introduce nitrogen for protection, and then add triethylamine, wherein the mass ratio of polyurethane particles, methyl methacrylate isothiocyanate, polyurethane film, and triethylamine is 1.3:2.1:1:0.02, and the reaction is carried out at 40°C in an oil bath for 8 hours. After the reaction, the polyurethane is washed with acetonitrile and dried to obtain an olefinated polyurethane;

[0046] (2) Adding olefinic polyurethane and acryl alcohol to N,N-dimethylformamide solvent, stirring evenly, and then adding azobisisobutyronitrile initiator, wherein the mass ratio of olefinic polyurethane, acryl alcohol and azobisisobutyronitrile initiator is 1:1.3:0.1, reacting at 80°C for 6h, and after the reaction is completed, distilling under reduced pressure, filtering and drying to obtain hydroxylated polyurethane;

[0047] (3) adding chitosan to an ethanol solvent to dissolve it, adding ethylene oxide at a constant pressure, wherein the mass ratio of chitosan to ethylene oxide is 2.1:2.5, heating in a water bath at 90° C., reacting for 12 h, washing with anhydrous ethanol after the reaction, drying, dialyzing, concentrating, and drying to obtain acetylated chitosan;

[0048] (4) adding alkynyl chitosan and azidopropylamine to N,N-dimethylformamide solvent for dissolution, degassing for 4 times, adding cuprous bromide catalyst, wherein the mass ratio of alkynyl chitosan, azidopropylamine and cuprous bromide catalyst is 1.4:1:0.3, passing nitrogen protection, reacting at 80°C for 24h, washing with tetrahydrofuran, concentrating by rotary evaporation, dialyzing and drying to obtain triazole-modified chitosan;

[0049] (5) adding hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane to N,N-dimethylacetamide, wherein the mass ratio of hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane is 1.0:1:1.3, heating to 100° C. and reacting for 10 h, centrifuging, washing with acetone, and drying to obtain modified polyurethane;

[0050] (6) Add epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a blender, wherein the mass ratio of epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone is 2.35:2.3:3.75:12:15, stir and mix at 95°C for 4 h to obtain a mixture, then pour the mixture into a ceramic embryo, cool it, and obtain corrosion-resistant polyurethane ceramics.

[0051] Example 5

[0052] (1) Add purified polyurethane particles to dimethylformamide solvent, stir and dissolve at 110°C for 12 hours, and then dry to obtain a polyurethane film; add methyl methacrylate isothiocyanate to the polyurethane film, introduce nitrogen for protection, and then add triethylamine, wherein the mass ratio of polyurethane particles, methyl methacrylate isothiocyanate, polyurethane film, and triethylamine is 1.7:2.6:1:0.03, and the reaction is carried out at 60°C in an oil bath for 14 hours. After the reaction, wash with acetonitrile and dry to obtain an olefinated polyurethane;

[0053] (2) Adding olefinic polyurethane and acryl alcohol to N,N-dimethylformamide solvent, stirring evenly, and then adding azobisisobutyronitrile initiator, wherein the mass ratio of olefinic polyurethane, acryl alcohol and azobisisobutyronitrile initiator is 1:1.6:0.4, reacting at 120°C for 12 hours, and after the reaction is completed, distilling under reduced pressure, filtering and drying to obtain hydroxylated polyurethane;

[0054] (3) adding chitosan to an ethanol solvent to dissolve it, adding ethylene oxide at a constant pressure, wherein the mass ratio of chitosan to ethylene oxide is 1.6:2.05, heating in a water bath at 80° C., reacting for 9 h, washing with anhydrous ethanol after the reaction, drying, dialyzing, concentrating, and drying to obtain acetylated chitosan;

[0055] (4) adding alkynyl chitosan and azidopropylamine to N,N-dimethylformamide solvent for dissolution, degassing by freezing for 3.5 times, adding cuprous bromide catalyst, wherein the mass ratio of alkynyl chitosan, azidopropylamine and cuprous bromide catalyst is 1.25:1:0.2, passing nitrogen protection, reacting at 70°C for 22h, washing with tetrahydrofuran, concentrating by rotary evaporation, dialyzing and drying to obtain triazole-modified chitosan;

[0056] (5) adding hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane to N,N-dimethylacetamide, wherein the mass ratio of hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane is 0.8:1:1.1, heating to 90°C for reaction for 8h, centrifuging, washing with acetone, and drying to obtain modified polyurethane;

[0057] (6) Add epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a blender, wherein the mass ratio of epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone is 1.2:2.1:3.1:11.6:14, stir and mix at 80°C for 3 h to obtain a mixture, then pour the mixture into a ceramic embryo, cool it, and obtain corrosion-resistant polyurethane ceramics.

[0058] Comparative Example 1

[0059] Add epoxy bentonite, yellow clay and porcelain stone into a stirrer, stir and mix at 95° C. for 4 hours to obtain a mixture, then pour the mixture into a ceramic embryo, cool it, and obtain a ceramic.

[0060] The corrosion-resistant polyurethane ceramics of Examples 1-5 and the ceramics of Comparative Example 1 were tested for alkali resistance and acid resistance. The acid resistance refers to placing the ceramic products in a hydrochloric acid solution with a mass fraction of 8% at a temperature of 25°C for 5 hours, and then observing the color of the ceramic surface. If it is unchanged, it is indicated by "++++", and if it fades or there are signs of corrosion on the surface, the number of "+" is reduced accordingly. The alkali resistance refers to placing the ceramic products in a sodium hydroxide solution with a mass fraction of 8% at a temperature of 25°C for 5 hours, and then observing the color of the ceramic surface. If it is unchanged, it is indicated by "++++", and if it fades or there are signs of corrosion on the surface, the number of "+" is reduced accordingly. The test results are shown in Table 1.

[0061] Table 1: Acid and alkali resistance test.

[0062] project Acid resistance Alkali resistance Example 1 +++++ +++++ Example 2 +++++ +++++ Example 3 +++++ +++++ Example 4 +++++ +++++ Example 5 +++++ +++++ Comparative Example 1 ++ ++

[0063] It can be seen from Table 1 that the corrosion-resistant polyurethane ceramic embodiments 1-5 of the present invention have better acid and alkali resistance than comparative example 1, and therefore have better corrosion resistance.

[0064] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing corrosion-resistant polyurethane ceramics, characterized in that: The preparation method of the corrosion-resistant polyurethane ceramic comprises the following steps: (1) Add purified polyurethane particles to dimethylformamide solvent, stir and dissolve at 80-110°C for 6-12 hours, and then dry to obtain a polyurethane film; add methyl methacrylate isothiocyanate to the polyurethane film, pass nitrogen for protection, then add triethylamine, and oil bath at 40-60°C for 8-14 hours. After the reaction, wash with acetonitrile and dry to obtain olefinic polyurethane; (2) Adding olefinated polyurethane and acryl alcohol to N,N-dimethylformamide solvent, stirring evenly, adding azobisisobutyronitrile initiator, reacting at 80-120°C for 6-12h, and after the reaction is completed, distilling under reduced pressure, filtering and drying to obtain hydroxylated polyurethane; (3) adding chitosan to an ethanol solvent to dissolve it, adding epoxide at a constant pressure, heating in a water bath at 70-90° C., reacting for 6-12 hours, washing with anhydrous ethanol, drying, dialyzing, concentrating, and drying to obtain acetylated chitosan; (4) adding acetylated chitosan and azidopropylamine to N,N-dimethylformamide solvent for dissolution, degassing by freezing for 3-4 times, adding cuprous bromide catalyst, introducing nitrogen protection, reacting at 60-80°C for 20-24h, washing with tetrahydrofuran, concentrating by rotary evaporation, dialyzing, and drying to obtain triazole-modified chitosan; (5) adding hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane to N,N-dimethylacetamide, heating to 90-110°C for reaction for 8-12h, centrifuging, washing with acetone, and drying to obtain modified polyurethane; (6) Adding epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone into a stirrer, stirring and mixing at 80-110° C. for 3-5 hours to obtain a mixture, and then pouring the mixture into a ceramic embryo, cooling it, and obtaining a corrosion-resistant polyurethane ceramic; The mass ratio of the polyurethane particles, methacrylate isothiocyanate, polyurethane film and triethylamine in (1) is 1.3-1.7:2.1-2.6:1:0.02-0.03; The mass ratio of olefinic polyurethane, acryl alcohol and azobisisobutyronitrile initiator in (2) is 1:1.3-1.6:0.1-0.4; The mass ratio of chitosan to ethylene oxide in (3) is 1.1-2.1:1.6-2.5; The mass ratio of acetylated chitosan, azidopropylamine and cuprous bromide catalyst in (4) is 1.1-1.4:1:0.1-0.3; The mass ratio of hexamethylene diisocyanate, triazole-modified chitosan and hydroxylated polyurethane in (5) is 0.8-1.2:1:1.1-1.5; The mass ratio of epoxy bentonite, modified polyurethane, polyurethane, yellow clay and porcelain stone in (6) is 1.2-1.5:2.1-2.5:3.1-4.4:10-12:8-15.

2. A corrosion-resistant polyurethane ceramic, characterized in that: The preparation method according to claim 1 is used to obtain the