阅读说明：本技术 一种仿荷叶结构的疏水材料及其制备方法 (Hydrophobic material with lotus leaf-like structure and preparation method thereof ) 是由 王发洲 雷鸣 刘志超 刘鹏 何永佳 于 2020-07-30 设计创作，主要内容包括：本发明公开了一种仿荷叶结构的疏水材料,由碳化胶凝材料、碳化增强剂、可成型有机物和固化剂热固性树脂组成。以荷叶为模板,将固化剂热固性树脂和可成型有机物混合后置于荷叶表面,通过固化剂对有机物的凝固作用制造仿荷叶结构模具片,此模具片表面具有同荷叶表面一样的乳突微结构；后将碳化胶凝材料置于模具片表面成型、压制并碳化,其中碳化过程中碳化增强剂的掺杂进一步提高材料的力学性能,最终通过纯物理手段使材料具有优异的疏水性能。本发明通过简单结构复制方法,将碳化胶凝材料改性为具有优异疏水性能的新型材料,水的接触角超过130°,碳化后的抗压强度达到120MPa。(The invention discloses a hydrophobic material with a lotus leaf-like structure, which consists of a carbonized cementing material, a carbonized reinforcing agent, a formable organic matter and a curing agent thermosetting resin. Mixing a curing agent thermosetting resin and a formable organic matter with lotus leaves as a template, placing the mixture on the lotus leaf surface, and manufacturing a lotus leaf structure-imitated mould sheet through the solidification effect of the curing agent on the organic matter, wherein the surface of the mould sheet has the mastoid microstructure which is the same as the lotus leaf surface; and then placing the carbonized cementing material on the surface of a die piece for molding, pressing and carbonizing, wherein the mechanical property of the material is further improved by doping a carbonization reinforcing agent in the carbonization process, and finally the material has excellent hydrophobic property by a pure physical means. According to the invention, by a simple structure replication method, the carbonized cementing material is modified into a novel material with excellent hydrophobic property, the contact angle of water exceeds 130 degrees, and the compressive strength after carbonization reaches 120 MPa.)

1. The hydrophobic material with lotus leaf-like structure is characterized by that its raw material includes carbonization gelatinizer, carbonization reinforcing agent, water, formable organic matter and solidifying agent thermosetting resin.

2. The lotus leaf-like structure-imitated hydrophobic material as claimed in claim 1, wherein the proportion relationship among the carbonized cementitious material, the carbonized reinforcing agent and water is as follows in parts by weight: 60-80 parts of carbonized cementing material, 0-0.8 part of carbonized reinforcing agent and 5-15 parts of water; the proportion relationship between the formable organic matter and the curing agent thermosetting resin is as follows according to the parts by weight: 60-100 parts of a formable organic matter and 6-10 parts of a curing agent thermosetting resin.

3. The preparation method of the lotus leaf-like structure-imitated hydrophobic material as claimed in claim 1 or 2, which is characterized by mainly comprising the following steps:

step 1: taking one lotus leaf, uniformly mixing curing agent thermosetting resin and formable organic matter according to a proportion, placing the mixture on the upper surface of the lotus leaf, and preparing the lotus leaf-like structure imitation sheet through the solidification effect of the curing agent thermosetting resin on the formable organic matter;

step 2: uniformly mixing the carbonized cementing material, a carbonization reinforcing agent and water according to a proportion to obtain a mixed material;

and step 3: placing the imitation sheet obtained in the step 1 at the bottom of a compression molding die, enabling the surface of the imitation sheet with the lotus leaf imitation structure to face upwards, adding the mixed material obtained in the step 2 above the imitation sheet, enabling the surface of the imitation sheet with the lotus leaf imitation structure to be in contact with the mixed material, pressing the imitation sheet into a blank body, and carbonizing the blank body to obtain the lotus leaf imitation structure hydrophobic material.

4. The hydrophobic material with the lotus leaf-like structure as claimed in claim 1, wherein the lotus leaf is a natural common lotus leaf.

5. The hydrophobic material with the lotus leaf-like structure as claimed in claim 1, wherein the carbonized gelled material is selected from one or more of gamma-type dicalcium silicate, monocalcium silicate, steel slag and tricalcium disilicate.

6. The hydrophobic material with the simulated lotus leaf structure as claimed in claim 1, wherein the carbonization enhancer is at least one selected from polyethylene glycol, polyvinyl alcohol, chitosan and amorphous silica materials.

7. The hydrophobic material imitating the lotus leaf structure as claimed in claim 1, wherein the formable organic substance is polydimethylsiloxane and the curing agent thermosetting resin is GLOZ-2M curing agent.

8. The lotus leaf-like structure-imitated hydrophobic material as claimed in claim 3, wherein the forming pressure in step 3 is 5-100 MPa.

9. The lotus leaf structure-imitated hydrophobic material as claimed in claim 3, wherein the carbonization process conditions in the step 3 are as follows: the temperature in the curing container is 5-50 ℃, the relative humidity is 50-100%, the concentration of carbon dioxide is 10-99.8%, the air pressure is 0.1-0.5MPa, and the carbonization time is 2-8 hours.

Technical Field

The invention relates to the technical field of building materials, in particular to a lotus leaf structure-imitated hydrophobic material and a preparation method thereof.

Background

The lotus leaves are sludge but not dyed, water drops can move freely on the water surface, and the natural phenomena are related to water drainage. Hydrophobic surface materials have attracted considerable attention in recent years. Researches show that the existence of the binary micro-nano structure is the root cause for realizing the hydrophobic property of the surface, and the special wettability of the hydrophobic surface ensures that the hydrophobic surface has wide application in various aspects, including self-cleaning, corrosion prevention, oil-water separation and the like. Furthermore, a rough surface structure and a low surface free energy are necessary conditions for preparing a hydrophobic surface. On this basis, many methods for preparing hydrophobic surfaces have been developed, such as etching, sol-gel methods, etc.

The durability of the traditional cement-based material is continuously improved along with the development of the technology, but the problems of self-cleaning, self-protection and pollution resistance are not well solved all the time. At present, a series of complex modes such as chemical synthesis and the like are adopted for a common surface coating, although the simple protection and self-cleaning effects can be achieved, the service life of the coating also needs to be cleaned for 2-3 years, the manual cleaning and the chemical maintenance are high in cost, and certain chemical corrosion and abrasion can be generated on the material in the cleaning process. Therefore, it is of great importance to develop a novel hydrophobic material with simple, durable, self-cleaning properties.

Disclosure of Invention

The invention aims to solve the technical problem of providing a hydrophobic material with a lotus leaf-like structure, and the carbonized cementing material is modified into a novel material with a certain function by a structure replication method, so that the hydrophobic and high-strength effects of the carbonized cementing material are realized.

The technical scheme adopted by the invention for solving the problems is as follows:

the hydrophobic material with lotus leaf imitating structure includes carbonizing gelatinizer, carbonizing reinforcer, water, formable organic matter and thermosetting curing agent resin.

According to the scheme, the raw materials comprise the following components in parts by weight: 60-80 parts of carbonized cementing material, 0-0.8 part of carbonized reinforcing agent, 5-15 parts of water, 60-100 parts of formable organic matter and 6-10 parts of curing agent thermosetting resin.

The preparation method of the hydrophobic material with the lotus leaf-like structure mainly comprises the following steps:

step 1: taking one lotus leaf, uniformly mixing a curing agent thermosetting resin and a formable organic matter according to a proportion, placing the mixture on the upper surface of the lotus leaf, and preparing the lotus leaf-like structure imitation sheet through the solidification effect of the curing agent thermosetting resin on the formable organic matter;

step 2: uniformly mixing the carbonized cementing material, the carbonization reinforcing agent and water according to a certain proportion;

and step 3: placing the imitation sheet obtained in the step 1 at the bottom of a compression moulding mould, enabling the surface with the lotus leaf imitation structure to face upwards, adding the mixed material obtained in the step 2 above the imitation sheet, pressing into a blank body, and carbonizing to obtain the hydrophobic material with the lotus leaf imitation structure.

According to the scheme, the lotus leaf is a natural common lotus leaf.

According to the scheme, the carbonized cementing material is selected from one or more of gamma-type dicalcium silicate, monocalcium silicate, steel slag, tricalcium disilicate and the like.

According to the scheme, the carbonization reinforcing agent is selected from at least one of polyethylene glycol, polyvinyl alcohol, chitosan, amorphous silica materials and the like.

According to the scheme, the formable organic matter and the curing agent thermosetting resin are binding materials, the curing agent thermosetting resin is doped to generate chemical reactions such as condensation, closed loop, addition or catalysis, the thermosetting resin is subjected to an irreversible change process, the formable organic matter is rapidly hardened, and the curing material inherently has chemical inertia and good chemical stability. Wherein the mouldable organic substance is Polydimethylsiloxane (PDMS), and the curing agent thermosetting resin is GLOZ-2M curing agent.

According to the scheme, the forming pressure in the step 3 is 5-100MPa, the thickness of a formed sample is determined by the addition amount of the carbonized cementing material, and the shape of the sample is determined by the shape of the imitation piece.

According to the scheme, the carbonization process conditions in the step 3 are as follows: the temperature in the curing container is 5-50 ℃, the relative humidity is 50-100%, the concentration of carbon dioxide is 10-99.8%, the air pressure is 0.1-0.5MPa, and the carbonization time is 2-8 hours.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, lotus leaves are used as a template, a curing agent thermosetting resin and a formable organic matter are mixed and then placed on the lotus leaf surface, and a lotus leaf structure imitation sheet is manufactured through the solidification effect of the curing agent on the organic matter, wherein the surface of the imitation sheet has the mastoid microstructure which is the same as that of the lotus leaf surface; and then placing the carbonized cementing material on the upper surface of the imitation slice for molding, pressing and carbonizing, wherein the mechanical property of the material is further improved by a carbonization reinforcing agent in the carbonization process in a doping mode, and the material has excellent hydrophobic property by a pressing and carbonizing means subsequently. According to the invention, by adopting a simple structure replication method, the carbonized cementing material is modified into a novel material with excellent hydrophobic property, the contact angle of water exceeds 130 degrees, and the compressive strength after carbonization reaches 120 MPa; human aging was measured by 4200 hours, and the stain resistance was rated 0.

The hydrophobic material with the lotus leaf-like structure has a wide application range, the surface self-cleaning mode can be applied to the inner and outer walls, tunnels, bridges, subway ports and the like of buildings, the surface of an outdoor object can be kept clean by means of rainwater and other natural conditions through the hydrophobicity and the self-cleaning capability of the hydrophobic material, the maintenance cost can be reduced, the labor force requirement can be reduced, the pollution degree to the environment can be minimized, the hydrophobic material in the current market almost needs to be doped with organic additives or coated with films on the surface, the material has the hydrophobic property, the manufacturing cost of the material is high, the manufacturing process is complex, part of the additives can also generate certain harm to the environment, and the environment-friendly concept is not met.

Detailed Description

In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the present invention is not limited to the following examples. The following detailed description of the embodiments, steps, features and effects of the lotus leaf-like hydrophobic material and the preparation method thereof according to the present invention will be made with reference to the preferred embodiments.

In the following examples, the carbonized cementitious material used was gamma-C₂S, a carbonization reinforcing agent adopts low molecular chitosan-chitin, a formable organic matter adopts Polydimethylsiloxane (PDMS), and a curing agent thermosetting resin adopts GLOZ-2M.

In the following examples, the shape of the molded sample is determined by the shape of the lotus leaf and the shape of the mold, but the cut size of the lotus leaf should not be larger than the size of the mold, and preferably, the cut shape of the lotus leaf and the size of the mold are consistent.