CN111138894A - Waterproof anticorrosive paint for historic building timber structure and preparation method thereof - Google Patents

Abstract

The invention relates to a waterproof anticorrosive paint for a wood structure of an ancient building and a preparation method thereof, belonging to the technical field of wood protection. The invention utilizes the mixed solution of triethylamine hydrogen trifluoride and ammonium hexafluorophosphate to prepare the wood impregnating compound, because the ionized ions in the mixed solution of triethylamine trihydrofluoride and ammonium hexafluorophosphate can penetrate into the amorphous area of the wood fiber and reach the outer surface of the crystalline area, the swelling in the amorphous area of the cellulose is generated by destroying the hydrogen bond combination between water and the cellulose, which is beneficial to the further penetration of the waterproof and anticorrosive coating, meanwhile, the invention also prepares the silica gel fixing copper mildew preventive by compounding tetraethoxysilane and copper ions, after the coating is infiltrated into the interior of the wood, the silicone gel can firmly fix the metal copper ions in the interior of the wood structure material, the protection performance of the historic building timber structure against mould is improved through the good mould-proof performance of the metal copper ions, and the waterproof performance of the wooden structure of the ancient building is also obviously improved after the wooden structure is used, and the wooden structure has wide application prospect.

Description

Waterproof anticorrosive paint for historic building timber structure and preparation method thereof

Technical Field

The invention relates to a waterproof anticorrosive paint for a wood structure of an ancient building and a preparation method thereof, belonging to the technical field of wood protection.

Background

China is a land big country and a sea big country, and the length of the coast line is 1.8 kilometers and occupies the fourth place in the world; along the continental coastline there are many gulf and port cities, north and south: rhizoma Coptidis, QINGHUANG island, TIANJIN, cigarette stand, QINGDAO, LIANYUNFANG, NANTONG, Shanghai, Ningbo, Wenzhou, Fuzhou, Xiamen, Guangzhou, Zhanjiang, North sea, etc. Different generations of wooden ancient building communities are distributed in the cities, are non-renewable precious historical heritages of the country, are important marks of the national civilization, and are precious wealth of the nationality. In these coastal cities, strong winds can bring salt fog in seawater to land, and a salt fog corrosive environment is formed.

Therefore, the wood ancient building protective coating in coastal areas is required to have good waterproof and anticorrosive performances, and in order to achieve the technical effects, the invention provides the wood structure waterproof and anticorrosive coating for the ancient building and the preparation method thereof.

Disclosure of Invention

The invention mainly solves the technical problem, and provides a wood structure waterproof anticorrosive paint for an ancient building and a preparation method thereof, aiming at the defect that the ancient building with a wood structure is damaged due to the fact that the ancient building with the wood structure is easily attacked by moisture and mould.

In order to solve the technical problem, the technical scheme adopted by the application is as follows:

a waterproof and anticorrosive paint for wooden structures of ancient buildings comprises functional emulsion, isophorone diisocyanate, maleic anhydride, glycerol and impregnating compound,

the impregnating compound is prepared from triethylamine hydrogen trifluoride and ammonium hexafluorophosphate;

the functional emulsion is prepared from a pre-emulsion and ammonia water;

the pre-emulsion is prepared from a self-made metal mildew inhibitor, tetraethyl orthosilicate, propanedione, n-butyl alcohol and stearic acid;

the self-made metal mildew preventive is prepared from tetraethoxysilane, absolute ethyl alcohol, deionized water, hydrochloric acid, a copper chloride solution and 3-aminopropyltriethoxysilane.

A preparation method of a waterproof anticorrosive paint for an ancient building timber structure comprises the following specific preparation steps:

(1) preparing a self-made metal mildew preventive: mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water, adjusting the pH value with hydrochloric acid, and adding a copper chloride solution and 3-aminopropyltriethoxysilane to react to prepare a self-made metal mildew preventive;

(2) preparation of a pre-emulsion: mixing the self-made metal mildew preventive, tetraethyl orthosilicate, propanedione, n-butyl alcohol and stearic acid for reaction to prepare pre-emulsion;

(3) preparation of functional emulsion: mixing the pre-emulsion and ammonia water for reaction to prepare functional emulsion;

(4) preparing a sizing agent: mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate to prepare a sizing agent;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps: the functional emulsion is prepared by mixing isophorone diisocyanate, maleic anhydride, glycerol and impregnating compound.

Further, the preparation method comprises the following specific steps:

(1) preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water, then putting the mixture into a beaker, moving the beaker into a water bath kettle, heating, adding hydrochloric acid into the beaker to adjust the pH value, and stirring for reaction;

after the stirring reaction is finished, continuously stirring, slowly adding the copper chloride solution and the 3-aminopropyltriethoxysilane into the beaker under the stirring state, and continuously stirring for reaction to obtain the self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing the self-made metal mildew preventive, tetraethyl orthosilicate, propanedione, n-butyl alcohol and stearic acid, putting the weighed self-made metal mildew preventive, the tetraethyl orthosilicate, the propanedione, the n-butyl alcohol and the stearic acid into a beaker, putting the beaker into a thermostat, raising the temperature of the thermostat, and stirring and reacting at constant temperature by using a stirrer to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water into the beaker, adding the magnetic rotary beads into the beaker while dropwise adding the ammonia water, mixing and stirring, and continuously mixing and stirring after dropwise adding is finished to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate to obtain a sizing agent;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

and adding the functional emulsion, isophorone diisocyanate, maleic anhydride, glycerol and a sizing agent into a reaction kettle, heating, stirring, reacting, and discharging to obtain the waterproof and anticorrosive paint for the historic building wood structure.

Further, the preparation method comprises the following specific steps:

(1) preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 3:5:10, then putting the mixture into a beaker, then transferring the beaker into a water bath kettle, heating to 50-60 ℃, adding hydrochloric acid into the beaker to adjust the pH value to 3-4, and stirring and reacting for 30-40 min;

after the stirring reaction is finished, continuously stirring at 40-50 ℃, slowly adding a 1mol/L copper chloride solution with the mass of 2-3 times of that of the ethyl orthosilicate and 3-aminopropyl triethoxysilane with the mass of 50% of that of the ethyl orthosilicate into a beaker under the stirring state, and continuously stirring for reaction for 3-5 hours to obtain a self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing 10-12 parts by weight of the self-made metal mildew preventive, 10-15 parts by weight of tetraethyl orthosilicate, 5-8 parts by weight of propanedione, 15-16 parts by weight of n-butanol and 1-2 parts by weight of stearic acid, putting the beaker into a thermostat, raising the temperature of the thermostat to 60-70 ℃, and stirring and reacting for 80-100 min by using a stirrer at constant temperature to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water with the mass fraction of 16-20% and the mass of 12-16% of the pre-emulsion into the beaker, adding magnetic rotating beads into the beaker while dropwise adding the ammonia water, mixing and stirring at the rotating speed of 300-350 r/min, and continuously mixing and stirring at the rotating speed of 300-350 r/min for 50-60 min after dropwise adding to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate according to the mass ratio of 5:1 to obtain an impregnating compound;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

adding 70-80 parts by weight of the functional emulsion, 30-40 parts by weight of isophorone diisocyanate, 20-30 parts by weight of maleic anhydride, 10-15 parts by weight of glycerol and 10-12 parts by weight of impregnating compound into a reaction kettle, heating to 85-95 ℃, stirring for reaction for 3-4 hours, and discharging to obtain the waterproof and anticorrosive paint for the historic building wood structure.

The beneficial technical effects of the invention are as follows:

(1) the wood impregnating compound is prepared by using the mixed solution of triethylamine trihydrofluoride and ammonium hexafluorophosphate, and because ionized ions in the mixed solution of triethylamine trihydrofluoride and ammonium hexafluorophosphate can penetrate into an amorphous area of wood fibers and reach the outer surface of a crystalline area, swelling in the amorphous area of cellulose occurs by destroying hydrogen bond bonding between water and cellulose, the further penetration of the waterproof anticorrosive coating is facilitated, meanwhile, the silicone gel is prepared by compounding ethyl orthosilicate and copper ions, and after the coating penetrates into the wood, the silicone gel can firmly fix the metal copper ions in the wood structure material, and the protection performance of the wood structure of the historic building on mould is improved through the good mould resistance of the metal copper ions;

(2) the invention introduces tetraethyl orthosilicate into the coating directly, generates nano silicon dioxide particles through reaction with ammonia water, and after the nano silicon dioxide particles are immersed into the ancient building, the nano silicon dioxide particles are embedded among molecules in the microstructure of the ancient building, on one hand, the compactness of the wood structure of the ancient building is improved through the filling of the nano silicon dioxide, the water infiltration is prevented, simultaneously, a large amount of nano silicon dioxide particles are bonded on the wood molecules and fibers of the ancient building, the roughness of the surface of each molecule of the wood is enhanced, and microscopic rough bulges are formed on the surface and the inside of the wood structure of the ancient building, the existence of the bulge structures is similar to the microscopic synapse function on the surface of lotus leaves, the contact angle between the wood structure material and water can be improved, the water molecules are difficult to adhere after contacting the wood, a hydrophobic interface is further formed, and the corrosion and water resistance of the wood structure of the ancient building is further improved, has wide application prospect.

Detailed Description

(1) Preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 3:5:10, then putting the mixture into a beaker, then transferring the beaker into a water bath kettle, heating to 50-60 ℃, adding hydrochloric acid into the beaker to adjust the pH value to 3-4, and stirring and reacting for 30-40 min;

after the stirring reaction is finished, continuously stirring at 40-50 ℃, slowly adding a 1mol/L copper chloride solution with the mass of 2-3 times of that of the ethyl orthosilicate and 3-aminopropyl triethoxysilane with the mass of 50% of that of the ethyl orthosilicate into a beaker under the stirring state, and continuously stirring for reaction for 3-5 hours to obtain a self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing 10-12 parts by weight of the self-made metal mildew preventive, 10-15 parts by weight of tetraethyl orthosilicate, 5-8 parts by weight of propanedione, 15-16 parts by weight of n-butanol and 1-2 parts by weight of stearic acid, putting the beaker into a thermostat, raising the temperature of the thermostat to 60-70 ℃, and stirring and reacting for 80-100 min by using a stirrer at constant temperature to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water with the mass fraction of 16-20% and the mass of 12-16% of the pre-emulsion into the beaker, adding magnetic rotating beads into the beaker while dropwise adding the ammonia water, mixing and stirring at the rotating speed of 300-350 r/min, and continuously mixing and stirring at the rotating speed of 300-350 r/min for 50-60 min after dropwise adding to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate according to the mass ratio of 5:1 to obtain an impregnating compound;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

adding 70-80 parts by weight of the functional emulsion, 30-40 parts by weight of isophorone diisocyanate, 20-30 parts by weight of maleic anhydride, 10-15 parts by weight of glycerol and 10-12 parts by weight of impregnating compound into a reaction kettle, heating to 85-95 ℃, stirring for reaction for 3-4 hours, and discharging to obtain the waterproof and anticorrosive paint for the historic building wood structure.

Example 1

(1) Preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to the mass ratio of 3:5:10, then putting the mixture into a beaker, then transferring the beaker into a water bath kettle, heating to 50 ℃, adding hydrochloric acid into the beaker to adjust the pH value to 3, and stirring and reacting for 30 min;

after the stirring reaction is finished, continuously stirring at 40 ℃, slowly adding a copper chloride solution with the concentration of 1mol/L and 2 times of the mass of the tetraethoxysilane and 3-aminopropyl triethoxysilane with the mass of 50% of the tetraethoxysilane into a beaker under the stirring state, and continuously stirring for reaction for 3 hours to obtain the self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing 10 parts of the self-made metal mildew preventive, 10 parts of tetraethyl orthosilicate, 5 parts of propanedione, 15 parts of n-butyl alcohol and 1 part of stearic acid in parts by weight, putting the beaker into a thermostat, raising the temperature of the thermostat to 60 ℃, and stirring and reacting for 80min by using a stirrer at constant temperature to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water with the mass fraction of 16% and the mass percentage of 12% of the pre-emulsion into the beaker, adding magnetic rotating beads into the beaker while dropwise adding, mixing and stirring at the rotating speed of 300r/min, and continuously mixing and stirring at the rotating speed of 300r/min for 50min after dropwise adding to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate according to the mass ratio of 5:1 to obtain an impregnating compound;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

adding 70 parts of the functional emulsion, 30 parts of isophorone diisocyanate, 20 parts of maleic anhydride, 10 parts of glycerol and 10 parts of impregnating compound into a reaction kettle, heating to 85 ℃, stirring for reaction for 3 hours, and discharging to obtain the waterproof and anticorrosive paint for the historic building wood structure.

Example 2

(1) Preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to the mass ratio of 3:5:10, then putting the mixture into a beaker, then transferring the beaker into a water bath kettle, heating to 55 ℃, adding hydrochloric acid into the beaker to adjust the pH value to 3, and stirring and reacting for 35 min;

after the stirring reaction is finished, continuously stirring at 45 ℃, slowly adding a copper chloride solution with the concentration of 1mol/L and 2 times of the mass of the ethyl orthosilicate and 3-aminopropyl triethoxysilane with the mass of 50% of the ethyl orthosilicate into a beaker under the stirring state, and continuously stirring for reaction for 4 hours to obtain the self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing 11 parts of the self-made metal mildew preventive, 13 parts of tetraethyl orthosilicate, 6 parts of propanedione, 15 parts of n-butyl alcohol and 1 part of stearic acid in parts by weight, putting the beaker into a thermostat, raising the temperature of the thermostat to 65 ℃, and stirring and reacting for 90min by using a stirrer at constant temperature to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water with the mass fraction of 18% and the mass percentage of 14% of the pre-emulsion into the beaker, adding magnetic rotating beads into the beaker while dropwise adding, mixing and stirring at the rotating speed of 330r/min, and continuously mixing and stirring at the rotating speed of 330r/min for 55min after dropwise adding to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate according to the mass ratio of 5:1 to obtain an impregnating compound;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

according to the weight parts, 75 parts of the functional emulsion, 35 parts of isophorone diisocyanate, 25 parts of maleic anhydride, 13 parts of glycerol and 11 parts of impregnating compound are added into a reaction kettle, the temperature is raised to 90 ℃, the mixture is stirred and reacts for 4 hours, and then the mixture is discharged, so that the waterproof and anticorrosive paint for the historic building wood structure is obtained.

Example 3

(1) Preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to the mass ratio of 3:5:10, then putting the mixture into a beaker, then transferring the beaker into a water bath kettle, heating to 60 ℃, adding hydrochloric acid into the beaker to adjust the pH value to 4, and stirring and reacting for 40 min;

after the stirring reaction is finished, continuously stirring at 50 ℃, slowly adding a 1mol/L copper chloride solution with 3 times of the mass of the ethyl orthosilicate and 3-aminopropyltriethoxysilane with 50% of the mass of the ethyl orthosilicate into a beaker under the stirring state, and continuously stirring for reaction for 5 hours to obtain the self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing 12 parts of the self-made metal mildew preventive, 15 parts of tetraethyl orthosilicate, 8 parts of propanedione, 16 parts of n-butanol and 2 parts of stearic acid in parts by weight, putting the beaker into a thermostat, raising the temperature of the thermostat to 70 ℃, and stirring and reacting for 100min by using a stirrer at constant temperature to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water with the mass fraction of 20% and the mass percentage of 16% of the pre-emulsion into the beaker, adding magnetic rotating beads into the beaker while dropwise adding, mixing and stirring at the rotating speed of 350r/min, and continuously mixing and stirring at the rotating speed of 350r/min for 60min after dropwise adding to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate according to the mass ratio of 5:1 to obtain an impregnating compound;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

adding 80 parts of the functional emulsion, 40 parts of isophorone diisocyanate, 30 parts of maleic anhydride, 15 parts of glycerol and 12 parts of impregnating compound into a reaction kettle, heating to 95 ℃, stirring for reaction for 4 hours, and discharging to obtain the waterproof and anticorrosive paint for the historic building wood structure.

Comparative example 1: the preparation method is similar to that of example 1 of the present application, except that the impregnating compound of the present invention is not added;

comparative example 2: the preparation method is similar to that of example 1 of the present application, except that the homemade metal mold preventive of the present invention is not added;

comparative example 3: the preparation method is similar to that of example 1 of the present application, except that the functional emulsion of the present invention is not added;

the ancient building timber structure waterproof anticorrosive coating in the embodiment of this application and the comparative example carries out performance detection respectively, and the testing result is shown as table 1:

water resistance test method: the waterproof and anticorrosive paint is uniformly coated on the surface of an ancient building wood structure material sample with the same size according to the same coating amount, the sample is placed in hot water at 40-50 ℃ after the surface is naturally dried and cured, the sample is taken out after 96 hours, and the water absorption rate of the sample is detected.

And (3) mildew condition: the paints of examples 1 to 3 and comparative example were applied to the surface of a square, and the area of the applied paint was 1m²And keeping the brushing thickness consistent during brushing, standing for 2 weeks in an environment with the relative humidity of air of 70-80% and the temperature of 30-40 ℃ after brushing is finished, and calculating the average mildew area ratio of the coating surface, wherein the average mildew area ratio is the ratio of the average mildew area in the unit area of the coating to the average mildew area in the unit area of the coating of the comparative example.

TABLE 1 measurement results of Properties

As can be seen from the detection data in the above table, the comparative example 1 of the present invention has no impregnating compound added, so the water absorption rate is increased, the mildew area ratio is increased, and the bacteriostatic rate is reduced, and it can be seen that the water resistance and mildew resistance of the coating of the present invention are improved by the addition of the impregnating compound of the present invention, while the comparative example 2 of the present invention has no self-made metal mildew preventive added, so the average no-change area ratio is increased, and the bacteriostatic rate is reduced, and therefore, the addition of the self-made metal mildew preventive of the present invention improves the mildew resistance and mildew resistance of the coating of the present invention, and the comparative example 3 of the present invention has no functional emulsion, so the water absorption rate is increased, the mildew area ratio is increased, and the bacteriostatic rate is reduced, and it can be seen that the water resistance and mildew resistance of the coating of the present invention are improved by the addition of the functional emulsion.

Claims (4)

1. The waterproof anticorrosive paint for the historic building wood structure comprises functional emulsion, isophorone diisocyanate, maleic anhydride, glycerol and an impregnating compound, and is characterized in that:

the impregnating compound is prepared from triethylamine hydrogen trifluoride and ammonium hexafluorophosphate;

the functional emulsion is prepared from a pre-emulsion and ammonia water;

the pre-emulsion is prepared from a self-made metal mildew inhibitor, tetraethyl orthosilicate, propanedione, n-butyl alcohol and stearic acid;

the self-made metal mildew preventive is prepared from tetraethoxysilane, absolute ethyl alcohol, deionized water, hydrochloric acid, a copper chloride solution and 3-aminopropyltriethoxysilane.

2. A preparation method of a waterproof anticorrosive paint for an ancient building wood structure is characterized by comprising the following specific preparation steps:

(1) preparing a self-made metal mildew preventive: mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water, adjusting the pH value with hydrochloric acid, and adding a copper chloride solution and 3-aminopropyltriethoxysilane to react to prepare a self-made metal mildew preventive;

(2) preparation of a pre-emulsion: mixing the self-made metal mildew preventive, tetraethyl orthosilicate, propanedione, n-butyl alcohol and stearic acid for reaction to prepare pre-emulsion;

(3) preparation of functional emulsion: mixing the pre-emulsion and ammonia water for reaction to prepare functional emulsion;

(4) preparing a sizing agent: mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate to prepare a sizing agent;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps: the functional emulsion is prepared by mixing isophorone diisocyanate, maleic anhydride, glycerol and impregnating compound.

3. The preparation method of the waterproof and anticorrosive paint for the historic building wood structure according to claim 2 is characterized by comprising the following specific preparation steps:

(1) preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water, then putting the mixture into a beaker, moving the beaker into a water bath kettle, heating, adding hydrochloric acid into the beaker to adjust the pH value, and stirring for reaction;

after the stirring reaction is finished, continuously stirring, slowly adding the copper chloride solution and the 3-aminopropyltriethoxysilane into the beaker under the stirring state, and continuously stirring for reaction to obtain the self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing the self-made metal mildew preventive, tetraethyl orthosilicate, propanedione, n-butyl alcohol and stearic acid, putting the weighed self-made metal mildew preventive, the tetraethyl orthosilicate, the propanedione, the n-butyl alcohol and the stearic acid into a beaker, putting the beaker into a thermostat, raising the temperature of the thermostat, and stirring and reacting at constant temperature by using a stirrer to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water into the beaker, adding the magnetic rotary beads into the beaker while dropwise adding the ammonia water, mixing and stirring, and continuously mixing and stirring after dropwise adding is finished to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate to obtain a sizing agent;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

and adding the functional emulsion, isophorone diisocyanate, maleic anhydride, glycerol and a sizing agent into a reaction kettle, heating, stirring, reacting, and discharging to obtain the waterproof and anticorrosive paint for the historic building wood structure.

4. The preparation method of the waterproof and anticorrosive paint for the historic building wood structure according to claim 2 or 3, which is characterized by comprising the following specific preparation steps:

(1) preparing a self-made metal mildew preventive:

mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 3:5:10, then putting the mixture into a beaker, then transferring the beaker into a water bath kettle, heating to 50-60 ℃, adding hydrochloric acid into the beaker to adjust the pH value to 3-4, and stirring and reacting for 30-40 min;

after the stirring reaction is finished, continuously stirring at 40-50 ℃, slowly adding a 1mol/L copper chloride solution with the mass of 2-3 times of that of the ethyl orthosilicate and 3-aminopropyl triethoxysilane with the mass of 50% of that of the ethyl orthosilicate into a beaker under the stirring state, and continuously stirring for reaction for 3-5 hours to obtain a self-made metal mildew preventive;

(2) preparation of a pre-emulsion:

weighing 10-12 parts by weight of the self-made metal mildew preventive, 10-15 parts by weight of tetraethyl orthosilicate, 5-8 parts by weight of propanedione, 15-16 parts by weight of n-butanol and 1-2 parts by weight of stearic acid, putting the beaker into a thermostat, raising the temperature of the thermostat to 60-70 ℃, and stirring and reacting for 80-100 min by using a stirrer at constant temperature to prepare a pre-emulsion;

(3) preparation of functional emulsion:

dropwise adding ammonia water with the mass fraction of 16-20% and the mass of 12-16% of the pre-emulsion into the beaker, adding magnetic rotating beads into the beaker while dropwise adding the ammonia water, mixing and stirring at the rotating speed of 300-350 r/min, and continuously mixing and stirring at the rotating speed of 300-350 r/min for 50-60 min after dropwise adding to obtain a functional emulsion;

(4) preparing a sizing agent:

mixing triethylamine hydrogen trifluoride and ammonium hexafluorophosphate according to the mass ratio of 5:1 to obtain an impregnating compound;

(5) the preparation of the waterproof anticorrosive paint for the historic building timber structure comprises the following steps:

adding 70-80 parts by weight of the functional emulsion, 30-40 parts by weight of isophorone diisocyanate, 20-30 parts by weight of maleic anhydride, 10-15 parts by weight of glycerol and 10-12 parts by weight of impregnating compound into a reaction kettle, heating to 85-95 ℃, stirring for reaction for 3-4 hours, and discharging to obtain the waterproof and anticorrosive paint for the historic building wood structure.