Bio-induced permeable crystalline waterproofing coating for marine environments and method of preparation thereof

Abstract

This invention relates to a bio-induced penetrating crystallizing waterproof coating for marine environments and its preparation method. The waterproof coating is made from the following raw materials in parts by weight: 40-50 parts silane impregnating agent; 10-15 parts glycerol; 2-6 parts artificial inducing agent; 5-8 parts bio-calcium powder inducing agent; 3-5 parts pigment inducing agent; and 2-4 parts crystallizing precipitant. The artificial inducing agent is composed of norepinephrine and trimethylamine in a 1:1 mass ratio. The bio-induced penetrating crystallizing waterproof coating provided by this invention is an environmentally friendly coating with high-efficiency anti-corrosion and self-healing functions. Furthermore, it can utilize the aggregation effect of marine shellfish to further increase the corrosion resistance of the underlying concrete.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to a bio-induced penetrating crystallization waterproof coating for marine environments and its preparation method. Background Technology

[0002] The average salinity of seawater is as high as 3.5%, mainly consisting of sodium (Na₂O). + Mg 2+ Cl - SO4 2- The complex interplay of factors, including plasma, salinity, and climate in marine environments, creates what is widely recognized as the harshest service environment for concrete. Common corrosion types include chemical corrosion and physical corrosion. The deterioration of concrete under chemical erosion primarily falls into two categories: one is due to the presence of magnesium in the marine environment... 2+ and SO4 2- It can consume alkaline oxides in concrete, leading to a gradual decrease in the concrete's cementitious strength and even the detachment of the surface concrete, resulting in deterioration. Another type is high concentrations of Cl... - Through surface penetration, it infiltrates the concrete, destroys the passivation film on the steel reinforcement surface, and forms corrosion cells, thereby causing steel reinforcement corrosion and concrete rust expansion and cracking. Physical corrosion mainly includes the long-term scouring effect of ocean waves and tides on concrete, the drying process of concrete being wetted by seawater and water evaporation caused by changes in seawater level and wave splash, concrete damage caused by salt precipitation, and concrete freeze-thaw damage.

[0003] Currently, domestic and international scholars have discovered that marine mollusks attached to concrete surfaces can improve the impermeability and durability of concrete, and the protective effect becomes more significant with increasing attachment density. However, in actual engineering projects, due to the influence of the external environment, the attached organisms often exhibit sparse, loose, or even non-attached phenomena.

[0004] In addition, traditional waterproof coatings suffer from a significantly shortened lifespan under the long-term scouring action in marine environments, exhibiting drawbacks such as poor adhesion and durability, thus failing to achieve the expected protective effect.

[0005] Therefore, providing a waterproof coating that combines performance and environmental friendliness is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the prior art and provide a bio-induced penetrating crystallization waterproof coating for marine environments and its preparation method.

[0007] To achieve the above objectives, the present invention employs the following technical solution: a bio-induced permeation crystallization waterproof coating for marine environments, wherein the waterproof coating is made from the following raw materials in parts by weight:

[0008] 40-50 parts of silane impregnating agent;

[0009] 10-15 parts of glycerol;

[0010] 2-6 parts artificial inducer;

[0011] 5-8 parts of biological calcium powder inducer;

[0012] Pigment inducer 3-5 parts;

[0013] 2-4 parts crystallizing precipitant;

[0014] The artificial inducer consists of norepinephrine and trimethylamine in a 1:1 mass ratio.

[0015] Specifically, the bio-calcium powder inducer is composed of shell powder, fish scale powder, and seaweed powder in a mass ratio of 2:1:1.

[0016] Specifically, the pigment inducer is one or more of aniline black, copper chromate black, or antimony sulfide.

[0017] Specifically, the crystallizing precipitant is anhydrous sodium carbonate or potassium methylsilicate.

[0018] In particular, after the waterproof coating is applied to the concrete surface, it can penetrate into the pores inside the concrete, react with the cement hydration products to generate insoluble crystals, densify the capillary pores on the concrete surface and repair micro-cracks.

[0019] In particular, after the waterproof coating is applied to the concrete surface, it can induce marine shellfish to attach. The bio-glue and mineral secretions secreted by the shellfish participate in the penetration and crystallization reaction process of the coating, and undergo covalent bonding, ionic cross-linking, homogeneous mineralization and synergistic crystallization reactions with the coating components to generate an insoluble chemical crystal barrier. At the same time, the shellfish shells form a physical barrier, which synergistically compacts the concrete structure and further enhances the concrete's impermeability and corrosion resistance.

[0020] A method for preparing a bio-induced penetrating crystallization waterproof coating for marine environments includes the following steps:

[0021] S1. After wetting the mixer, add the biological calcium powder inducer, pigment inducer and artificial inducer and stir at low speed for 30 seconds.

[0022] S2. While maintaining low-speed stirring, add glycerol, ensuring that the addition is completed within 20s-30s, and then stir at high speed for 20s to obtain solution α.

[0023] S3. Mix solution α with silane impregnating agent and stir at low speed for 30s, then add crystallizing precipitant and stir at high speed for 20s to obtain solution β;

[0024] S4. Heat solution β to 70°C in a constant temperature water bath, stir at low speed to fully dissolve and react for 3 hours to obtain a bio-induced penetrating crystallization waterproof coating.

[0025] The beneficial effects of this invention are:

[0026] Penetrating crystalline waterproof coatings can penetrate into the pores inside the concrete structure and react with cement hydration products to generate insoluble crystalline compounds. This densifies the capillary pores on the concrete surface, increases the waterproofing capacity of the concrete base layer, and can also repair cracks on the concrete surface caused by freeze-thaw damage.

[0027] A bio-inducing method is employed to induce shellfish bio-adsorption on the surface of the waterproof layer. The dense bio-adhesive secreted by the shellfish and the protective shell further enhance the impermeability of the concrete surface. Shellfish secretions act as an active reaction medium, participating in the nucleation, growth, bonding, and curing processes of the penetrating crystallizing material. This couples the chemical penetration crystallization of the coating with biomineralization crystallization, forming an irreversible, integrated chemical barrier. This fundamentally solves the problems of concrete erosion and aging in marine environments, achieving long-term protection.

[0028] The protective effect is significant and extremely durable. As the amount of bio-adsorbed material increases, the impermeability of the concrete will continue to improve over time. Moreover, this material is green and environmentally friendly and will not pollute the waters in which it is located. Detailed Implementation

[0029] The present invention will be further described below with reference to embodiments:

[0030] A bio-induced penetrating crystallization waterproof coating for marine environments, comprising the following parts by weight of raw materials:

[0031] 40-50 parts of silane impregnating agent;

[0032] 10-15 parts of glycerol;

[0033] Artificial inducer 2-6 parts; composed of norepinephrine and trimethylamine in a 1:1 mass ratio.

[0034] 5-8 parts of biological calcium powder inducer; composed of shell powder, fish scale powder and seaweed powder in a mass ratio of 2:1:1.

[0035] Pigment inducer 3-5 parts; one or more of aniline black, copper chromium black or antimony sulfide.

[0036] 2-4 parts of crystallizing precipitant; anhydrous sodium carbonate or potassium methylsilicate.

[0037] After being applied to the concrete surface, this waterproof coating can penetrate into the pores inside the concrete, react with the cement hydration products to form insoluble crystals, thus denser the capillary pores on the concrete surface and repairing micro-cracks.

[0038] After being applied to the concrete surface, this waterproof coating can induce marine shellfish to attach. The bio-glue and mineral secretions secreted by the shellfish participate in the penetration and crystallization reaction of the coating, undergoing covalent bonding, ionic cross-linking, homogeneous mineralization, and synergistic crystallization reactions with the coating components to generate an insoluble chemical crystal barrier. At the same time, the shellfish shells form a physical barrier, thus synergistically compacting the concrete structure and further enhancing the concrete's impermeability and corrosion resistance.

[0039] The key reaction process by which shellfish secretions participate in the permeation and crystallization of materials is as follows:

[0040] (1) Covalent bonding reaction (silane impregnating agent and shellfish secretions)

[0041] Marine shellfish secretions (mussel adhesive protein, mucopolysaccharide) are rich in hydroxyl, carboxyl, and catechol (DOPA) active groups. These groups undergo dehydration condensation with the silanol groups of the silane impregnating agent in the coating to form stable Si–O–C covalent bonds. This firmly anchors the shellfish bio-adhesive to the interface between the coating and the concrete, forming an organic-inorganic covalent bond layer, which provides stable interfacial nucleation sites for infiltration and crystallization.

[0042] (2) Homogeneous mineralization and ionic bonding reaction (biological calcium powder inducer and shellfish secretions)

[0043] In coatings, bio-calcium powder inducers (shell powder, fish scale powder, seaweed powder, with calcium carbonate as the main phase) undergo homogeneous epitaxial crystallization with calcium carbonate precursors and chitin in shellfish secretions, resulting in tight intergranular bonding; simultaneously, the amino and carboxyl groups in the secretions react with the calcium carbonate in the coating. 2+ It forms ionic and coordination bonds, constructs a protein-calcium mineralization network, and simultaneously participates in the crystal growth of infiltration crystallization inside concrete, thereby improving crystal density and bonding strength.

[0044] (3) Polymer cross-linking and curing reaction (artificial inducer and shellfish secretions)

[0045] The artificial inducers in coatings (norepinephrine, trimethylamine) contain phenolic hydroxyl and amino active groups, which undergo amidation and Schiff base cross-linking reactions with carboxyl and DOPA quinone groups in shellfish secretions to form a three-dimensional polymer covalent cross-linking network. This rapidly solidifies the shellfish bio-adhesive layer, strengthens the interfacial bonding force of the penetration crystallization reaction, and accelerates the crystallization process.

[0046] (4) Synergistic crystallization reaction (crystallizing precipitant and shellfish secretions)

[0047] Paint crystallizing and precipitating agents (anhydrous sodium carbonate, potassium methylsilicate) release carbonate and silicate ions, which react with calcium in shellfish secretions. 2+ The hydroxyl groups undergo a synergistic precipitation reaction to generate insoluble crystals of calcium carbonate and calcium silicate, which fill the pores at the interface between the coating, secretions, and concrete, and form a continuous crystallization system with the cement hydration products inside the concrete, thus perfecting the dense structure of the penetrating crystals.

[0048] (5) Hydrogen bond plasticizing concerted reaction (glycerol and shellfish secretions)

[0049] The polyol hydroxyl groups of glycerol in the coating form high-density hydrogen bonds with shellfish secretions, plasticizing the cross-linked network structure, improving the toughness of the composite barrier, and ensuring that the penetration crystallization reaction can continue and remain stable in the high-salt and high-humidity marine environment.

[0050] A method for preparing a bio-induced penetrating crystallization waterproof coating for marine environments includes the following steps:

[0051] S1. After wetting the mixer, add the biological calcium powder inducer, pigment inducer and artificial inducer and stir at low speed for 30 seconds.

[0052] S2. While maintaining low-speed stirring, add glycerol, ensuring that the addition is completed within 20s-30s, and then stir at high speed for 20s to obtain solution α.

[0053] S3. Mix solution α with silane impregnating agent and stir at low speed for 30s, then add crystallizing precipitant and stir at high speed for 20s to obtain solution β;

[0054] S4. Heat solution β to 70°C in a constant temperature water bath, stir at low speed to fully dissolve and react for 3 hours to obtain a bio-induced penetrating crystallization waterproof coating.

[0055] Example 1

[0056] A bio-induced penetrating crystallizing waterproof coating for marine environments, the waterproof coating is made from the following raw materials in parts by weight: 40 parts silane impregnating agent, 10 parts glycerol, 2 parts artificial inducing agent, 5 parts bio-calcium powder inducing agent, 3 parts pigment inducing agent, and 2 parts crystallizing precipitant.

[0057] A method for preparing a bio-induced penetrating crystallization waterproof coating for marine environments includes the following steps:

[0058] S1. After wetting the mixer, add the biological calcium powder inducer, pigment inducer and artificial inducer and stir at low speed for 30 seconds.

[0059] S2. While maintaining low-speed stirring, add glycerol, ensuring that the addition is completed within 20s-30s, and then stir at high speed for 20s to obtain solution α.

[0060] S3. Mix solution α with silane impregnating agent and stir at low speed for 30s, then add crystallizing precipitant and stir at high speed for 20s to obtain solution β;

[0061] S4. Heat solution β to 70°C in a constant temperature water bath, stir at low speed to fully dissolve and react for 3 hours to obtain a bio-induced penetrating crystallization waterproof coating.

[0062] The method of use is as follows: When the tide recedes, use a cleaning agent or a high-pressure water gun to clean the concrete surface in the splash zone to remove dust, oil, and other impurities; dry the surface to ensure it is dry, clean, and dust-free; stir the bio-induced penetrating crystallizing waterproof coating prepared by this invention evenly before use. If stratification occurs during storage, it should be stirred again until homogeneous. No dilution is required; use directly; apply the coating evenly to the concrete surface using a brush, roller, or sprayer. If better protection is required, the coating can be applied repeatedly. When using, pay attention to safety precautions to avoid contact with skin and eyes; dry and cure again; after curing, when the coating is immersed in seawater, the inducing components in the coating begin to function, actively attracting shellfish larvae (such as oyster larvae) from the nearby sea area to attach.

[0063] Example 2

[0064] A bio-induced penetrating crystallizing waterproof coating for marine environments, the waterproof coating is made from the following raw materials in parts by weight: 40 parts silane impregnating agent, 15 parts glycerol, 6 parts artificial inducing agent, 8 parts bio-calcium powder inducing agent, 5 parts pigment inducing agent, and 2 parts crystallizing precipitant.

[0065] The preparation method and usage method are the same as in Example 1.

[0066] Example 3

[0067] A bio-induced penetrating crystallizing waterproof coating for marine environments, the waterproof coating is made from the following raw materials in parts by weight: 45 parts silane impregnating agent, 10 parts glycerol, 6 parts artificial inducing agent, 8 parts bio-calcium powder inducing agent, 5 parts pigment inducing agent, and 3 parts crystallizing precipitant.

[0068] The preparation method and usage method are the same as in Example 1.

[0069] Example 4

[0070] A bio-induced penetrating crystallizing waterproof coating for marine environments, the waterproof coating is made from the following raw materials in parts by weight: 45 parts silane impregnating agent, 12 parts glycerol, 4 parts artificial inducing agent, 6 parts bio-calcium powder inducing agent, 4 parts pigment inducing agent, and 3 parts crystallizing precipitant.

[0071] The preparation method and usage method are the same as in Example 1.

[0072] Example 5

[0073] A bio-induced penetrating crystallizing waterproof coating for marine environments, the waterproof coating is made from the following raw materials in parts by weight: 45 parts silane impregnating agent, 15 parts glycerol, 2 parts artificial inducing agent, 5 parts bio-calcium powder inducing agent, 3 parts pigment inducing agent, and 3 parts crystallizing precipitant.

[0074] The preparation method and usage method are the same as in Example 1.

[0075] Example 6

[0076] A bio-induced penetrating crystallizing waterproof coating for marine environments, the waterproof coating is made from the following raw materials in parts by weight: 50 parts silane impregnating agent, 10 parts glycerol, 2 parts artificial inducing agent, 5 parts bio-calcium powder inducing agent, 3 parts pigment inducing agent, and 4 parts crystallizing precipitant.

[0077] The preparation method and usage method are the same as in Example 1.

[0078] Example 7

[0079] A bio-induced penetrating crystallizing waterproof coating for marine environments, the waterproof coating is made from the following raw materials in parts by weight: 50 parts silane impregnating agent, 15 parts glycerol, 6 parts artificial inducing agent, 8 parts bio-calcium powder inducing agent, 5 parts pigment inducing agent, and 4 parts crystallizing precipitant.

[0080] The preparation method and usage method are the same as in Example 1.

[0081] The composition of the waterproof coating components in Examples 1-7 above is shown in Table 1.

[0082] Table 1. Composition of waterproof coating components in Examples 1-7

[0083]

[0084] The performance indicators of the penetrating crystalline waterproof coatings in Examples 1-7 were tested for 28 days. The test results are shown in Table 2 (bioadhesion not considered):

[0085] Table 2 Performance Indicators of Penetrating Crystalline Waterproof Coating after 28 Days

[0086]

[0087] As shown in Table 2, the bio-induced penetrating crystallizing waterproof coating prepared by this invention has good compressive strength, with a wet substrate bonding strength between 1.8 and 2.5 MPa; moreover, the permeability and resistance to harmful media intrusion of concrete are significantly improved, with a permeation pressure greater than 1.8 MPa and a chloride ion diffusion coefficient of 4.35 × 10⁻⁶. -12 m 3 / s-7.09×10-12 m 3 Between / s.

[0088] The oyster induction experiment was initiated by fixing concrete specimens (150mm×150mm×450mm) coated with a bio-induced penetrating crystallizing waterproof coating at certain intervals to the bottom of the cultivation tank. Seawater was then poured into the tank to a height of 400mm. Finally, oyster larvae with an abundance of 0.75 ind / ml were evenly scattered into the cultivation tank, and an oxygen pump was turned on to increase oxygen levels. The seawater temperature in the cultivation tank was maintained at 15±2℃, the salinity at 35±1, and the light duration at least 15 hours per day, with an intensity equivalent to ordinary fluorescent lighting. Chlorella was used as food and evenly added to the cultivation tank three times a day at regular intervals, the amount of food depending on the growth rate of the oyster larvae. The seawater in the cultivation tank was changed every two days. After 30 days of cultivation, the specimens were removed, and the number of attached oysters was counted. The specimens were then returned to their original positions, and the number of oysters was counted again after 60 days. The specific data of the oyster induction experiment are shown in Table 3 below.

[0089] Table 3 Oyster induction test data

[0090]

[0091] Note: The blank control group consists of concrete specimens of the same specifications that were not coated with the waterproof coating of this invention. The test conditions are completely consistent with those of each embodiment. It is used to verify the bio-inducing effect and the protective performance improvement effect of the coating.

[0092] Based on the number of oyster attachments, in terms of time, the number of oyster attachments at 60 days was significantly higher than at 30 days, consistent with the natural growth, development, and attachment of oyster larvae (larvae need a certain amount of time to complete metamorphosis and secrete bio-adhesive to adhere to the surface). In terms of formulation, Example 7, with the best basic performance (wet substrate adhesion strength 2.5 MPa, base osmotic pressure 2.6 MPa), had the highest number of attachments. This is because the coating adheres more firmly to the concrete substrate, and the ratio of biological inducers (artificial inducer and biological calcium powder inducer) is more reasonable, resulting in a stronger attraction for oyster larvae. In comparison with the control group, the number of attachments in the blank control group was only 1 / 4 to 1 / 8 of that in each example, proving that the biological induction system of this invention (artificial inducer and biological calcium powder inducer) can effectively solve the problem of "sparse natural attachment of shellfish," with a significant induction effect.

[0093] Logical analysis of the protective performance data shows that: The osmotic pressure after attachment is higher than that before attachment (In Example 1, the osmotic pressure before attachment was 1.8 MPa, after 30 days it was 2.7 MPa, and after 60 days it was 3.1 MPa), and the 60-day data is higher than the 30-day data. This is because the more oysters attached, the more complete the dense bio-glue secreted by them and the physical barrier formed by the shells, resulting in a stronger effect in preventing seawater penetration; Chloride ion diffusion coefficient: The value is significantly reduced after attachment (In Example 7, the chloride ion diffusion coefficient before attachment was 4.35 × 10⁻⁶). -12 m 3 The chloride ion diffusion coefficient after 30 days of adhesion is 2.51 × 10⁻⁶. -12 m 3 The chloride ion diffusion coefficient after 60 days of adhesion is 1.83 × 10⁻⁶. -12 m 3 / s), and is negatively correlated with the number of attached particles, because the composite barrier of bio-adhesive and shells can effectively block the penetration path of chloride ions and reduce their invasion into the concrete for corrosion; Control group comparison: Even with a small number of oysters attached, the protective performance of the blank control group is still far lower than that of each example, proving that the composite system of coating base protection and bio-attachment enhancement protection is the core of improving the durability of concrete in marine environments, rather than simply relying on bio-attachment.

[0094] This invention constructs a dual induction mechanism—active attraction through chemical signals and passive induction through the biological environment—by utilizing the synergistic effect of an artificial inducing agent and a biological calcium powder inducing agent. The artificial inducing agent, composed of norepinephrine and trimethylamine in a 1:1 mass ratio, simulates the natural chemical signals of marine shellfish larvae, actively attracting larvae to aggregate and accelerating their metamorphosis and attachment process. The biological calcium powder inducing agent, composed of shell powder, fish scale powder, and seaweed powder, simulates the substrate environment for natural attachment by marine shellfish, providing a suitable attachment surface for larvae. Experimental results (see Table 3) show that concrete specimens coated with this invention exhibited 22-43 oyster attachments per specimen after 30 days and 33-65 per specimen after 60 days, significantly higher than the 5-8 oysters per specimen in the uncoated control group. This improved induction efficiency solves the technical problem of sparse and loose natural attachment of marine shellfish in existing technologies, providing an active and controllable technical means for the ecological protection of marine engineering concrete.

[0095] This invention achieves dual enhancement of active repair and passive protection for concrete through a dual mechanism of penetration crystallization and bio-induced adhesion. The penetration crystallization mechanism involves the silane impregnating agent and crystallizing precipitant in the coating penetrating into the pores of the concrete, reacting with cement hydration products to generate insoluble crystals, thus densifying the capillary pores on the concrete surface and repairing micro-cracks. Experimental results (see Table 2) show that concrete coated with this invention exhibits a 28-day penetration pressure of 1.8-2.6 MPa and a chloride ion diffusion coefficient reduced to 4.35-7.09 × 10⁻⁶ MPa.-12 m 3 / s, significantly improving the initial impermeability of concrete. Biological protection mechanism: Inducing attached marine shellfish (such as oysters) to secrete dense bio-glue, whose shells form a physical barrier, further blocking harmful media (Cl) in seawater. - SO4 2- Mg 2+ The intrusion of chloride ions (etc.) was investigated. Experimental results (see Table 3) show that with the extension of adhesion time and the increase of the number of adherent particles, the osmotic pressure of the concrete further increased to 3.1-4.8 MPa, while the chloride ion diffusion coefficient further decreased to 1.83-4.15 × 10⁻⁶. -12 m 3 / s, the protective performance shows a continuous increasing trend. The two work together to form an initial dense and continuously enhanced protective system, breaking through the limitation of the traditional waterproof coating's protective performance decaying with service time.

[0096] The penetrating crystallizing component in the coating of this invention can continuously generate insoluble crystals in the pores and microcracks inside concrete, giving the coating a self-healing function. When microcracks appear in concrete due to factors such as freeze-thaw cycles and loads, the active component in the coating can react with water to generate crystals again, automatically filling the cracks. Experimental results (see Table 2) show that the self-healing performance index of the coating of this invention reaches 65%-78%, which can effectively delay the deterioration process of concrete and extend its service life in harsh marine environments.

[0097] This invention utilizes natural biomass materials such as bio-calcium powder inducers (shell powder, fish scale powder, seaweed powder), and artificial inducers (norepinephrine, trimethylamine) in small quantities that are biodegradable. It releases no heavy metals, no organic solvents, and no toxic or harmful substances. Neither the coating itself nor the shellfish it induces to adhere to cause pollution to the marine environment, meeting the requirements of green environmental protection and sustainable development, and possessing both engineering protection and ecological restoration functions.

[0098] The present invention has been described above by way of example. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A bio-induced penetrating crystallization waterproof coating for marine environments, characterized in that, This waterproof coating is made from the following raw materials in parts by weight: 40-50 parts of silane impregnating agent; 10-15 parts of glycerol; 2-6 parts artificial inducer; 5-8 parts of biological calcium powder inducer; Pigment inducer 3-5 parts; 2-4 parts crystallizing precipitant; The artificial inducer consists of norepinephrine and trimethylamine in a 1:1 mass ratio.

2. The bio-induced penetrating crystallization waterproof coating for marine environments according to claim 1, characterized in that, The biological calcium powder inducer is composed of shell powder, fish scale powder and seaweed powder in a mass ratio of 2:1:

1.

3. The bio-induced penetrating crystallization waterproof coating for marine environments according to claim 1, characterized in that, The pigment inducer is one or more of aniline black, copper chromium black, or antimony sulfide.

4. The bio-induced penetrating crystallization waterproof coating for marine environments according to claim 1, characterized in that, The crystallizing precipitant is anhydrous sodium carbonate or potassium methylsilicate.

5. The bio-induced penetrating crystallization waterproof coating for marine environments according to claim 1, characterized in that, After being applied to the concrete surface, this waterproof coating can penetrate into the pores inside the concrete, react with the cement hydration products to form insoluble crystals, thus denser the capillary pores on the concrete surface and repairing micro-cracks.

6. The bio-induced penetrating crystallization waterproof coating for marine environments according to claim 1, characterized in that, After being applied to the concrete surface, this waterproof coating can induce marine shellfish to attach. The bio-glue and mineralized secretions secreted by the shellfish participate in the penetration and crystallization reaction of the coating, undergoing covalent bonding, ionic cross-linking, homogeneous mineralization, and synergistic crystallization reactions with the coating components to generate an insoluble chemical crystal barrier. At the same time, the shellfish shells form a physical barrier, thus synergistically compacting the concrete structure and further enhancing the concrete's impermeability and corrosion resistance.

7. A method for preparing a bio-induced penetrating crystallization waterproof coating for marine environments according to any one of claims 1-6, characterized in that, Includes the following steps: S1. After wetting the mixer, add the biological calcium powder inducer, pigment inducer and artificial inducer and stir at low speed for 30 seconds. S2. While maintaining low-speed stirring, add glycerol, ensuring that the addition is completed within 20s-30s, and then stir at high speed for 20s to obtain solution α. S3. Mix solution α with silane impregnating agent and stir at low speed for 30s, then add crystallizing precipitant and stir at high speed for 20s to obtain solution β; S4. Heat solution β to 70°C in a constant temperature water bath, stir at low speed to fully dissolve and react for 3 hours to obtain a bio-induced penetrating crystallization waterproof coating.

Images