阅读说明：本技术 废漆渣再生利用防污自洁水性建筑涂料的制备方法 (Preparation method of antifouling self-cleaning water-based architectural coating by recycling waste paint residues ) 是由 姚伯龙 王海潮 陈欢 王宇通 倪亚洲 程广鸿 张晋瑞 王利魁 于 2020-12-30 设计创作，主要内容包括：废漆渣再生利用防污自洁水性建筑涂料的制备方法,属于功能性可再生材料回收利用技术领域。本发明提供了一种利用纳米级二氧化硅、硅氧烷、废漆渣改性合成的具有疏水自洁特性的建筑涂料填充料。在填充料改性中,复合杂化一种硅溶胶使纳米粒子表面活化,利用湿浆法处理,使纳米硅包覆在废漆渣料的表面,使改性废漆渣具备了优异的疏水特性,可应用于真石漆填充料,建筑外墙等建筑材料领域。(A preparation method of an antifouling self-cleaning water-based architectural coating by recycling waste paint residues belongs to the technical field of functional renewable material recycling. The invention provides a building coating filler with hydrophobic self-cleaning property, which is synthesized by modifying nano-scale silicon dioxide, siloxane and waste paint residues. In the modification of the filling material, a silica sol is compounded and hybridized to activate the surfaces of nano particles, and the nano particles are treated by a wet slurry method to coat the surfaces of the waste paint slag, so that the modified waste paint slag has excellent hydrophobic property and can be applied to the fields of building materials such as stone paint filling materials, building external walls and the like.)

1. The preparation method of the antifouling self-cleaning water-based architectural coating by recycling the waste paint slag is characterized in that:

(1) pretreatment: taking waste paint slag to be dried in a drying oven for pretreatment; crushing the pretreated waste paint slag by using a powder grinding machine, grinding by using a ball mill, and then sieving;

(2) preparation of component 1: dispersing the powder sieved in the step (1) in water, and grinding and dispersing the powder by using a grinding and dispersing machine to obtain slurry with a finer particle size for later use; is marked as component 1;

(3) preparation of component 2: adding siloxane into ethanol, continuously stirring, reacting for a period of time, adding a silane coupling agent, hydrochloric acid and deionized water, heating, and continuously stirring for reacting to obtain a component 2;

(4) preparation of component 3: adding nano silicon dioxide into ethanol for ultrasonic dispersion; continuously adding siloxane, heating and continuously stirring, adding a nitrogen-containing silane coupling agent, continuously stirring for reaction, finally adding deionized water, and continuously stirring to obtain a component 3;

(5) compounding: compounding the component 1, the component 2 and the component 3 according to a certain proportion, dispersing with ethanol, placing in a container, and stirring at normal temperature; and (3) dropwise adding a silane coupling agent, continuously stirring for reaction, and performing ultrasonic treatment after the reaction to obtain the antifouling self-cleaning water-based architectural coating.

2. The method for preparing the antifouling self-cleaning water-based architectural coating by recycling the waste paint residues according to claim 1 is characterized in that: the waste paint slag is industrial equipment and/or automobile baking coating waste paint slag.

3. The method for preparing the antifouling self-cleaning water-based architectural coating by recycling the waste paint residues according to claim 1 is characterized in that: and (3) and (5) the silane coupling agent is a silane coupling agent containing epoxy groups and amino groups.

4. The method for preparing the antifouling self-cleaning water-based architectural coating by recycling the waste paint residues according to claim 3, is characterized in that: the silane coupling agent is specifically one of KH560, KH550, KH570, vinyl siloxane or perfluorooctyl siloxane.

5. The method for preparing the antifouling self-cleaning water-based architectural coating by recycling the waste paint residues according to claim 1 is characterized in that: the nitrogen-containing silane coupling agent in the step (4) is hexamethyldisilazane.

6. The preparation method of the antifouling self-cleaning water-based architectural coating recycled by the waste paint slag according to claim 1, which is characterized in that the step (1) is as follows: placing 8-10g of waste paint residues into a dry and clean conical flask, placing the conical flask into a drying oven with the temperature set at 120-150 ℃, and pretreating for 2-3 h; crushing the pretreated waste paint slag by using a powder grinding machine, and then grinding by using a ball mill; and sieving the ball-milled waste paint slag powder, and controlling the particle size to be 800-2000 meshes.

7. The preparation method of the antifouling self-cleaning water-based architectural coating recycled by the waste paint residues according to claim 1, which is characterized in that the preparation of the component 1 in the step (2) is as follows: dispersing the powder sieved in the step (1) in 20-40g of water, and grinding and dispersing for 5-8h by using a grinding and dispersing machine to obtain 2000-mesh slurry for later use; is marked as component 1.

8. The preparation method of the antifouling self-cleaning water-based architectural coating recycled by the waste paint residues according to claim 1, which is characterized in that the preparation of the component 2 in the step (3) is as follows: adding 2.80-2.90g of siloxane into 25-30g of ethanol, continuously stirring at 500r/min for 300-.

9. The preparation method of the antifouling self-cleaning water-based architectural coating recycled by the waste paint residues according to claim 1, which is characterized in that the preparation of the component 3 in the step (4) is as follows: adding 0.15g of nano silicon dioxide into 25-30g of ethanol, and performing ultrasonic dispersion for 15-25min at 28-40 KHz; continuing to add 2-3g of siloxane, heating to 50-60 ℃, continuously stirring for 10-20min, adding 1.5-1.7g of nitrogen-containing silane coupling agent, stirring for 25-35min at 500r/min of 300-;

further, the nano-silica is specifically fumed silica and/or ultrafine silica with the particle size of 30 nm.

10. The preparation method of the antifouling self-cleaning water-based architectural coating recycled by the waste paint slag according to claim 1, which is characterized in that the compounding in the step (5) is as follows: according to the component 1: and (2) component: the mass ratio of the component 3 is 40-50: 1: 8-10, dispersing with ethanol, and mixing the following raw materials: the mass ratio of the component 2 is 20-30: 1, placing the mixture into a dry and clean three-neck flask; stirring at normal temperature for 500 r/min; dropping a silane coupling agent at a speed of 3-6d/s by using a dropping funnel, wherein the silane coupling agent: the mass ratio of the component 2 is 0.5-1: 1, stirring for 2-3h at 500r/min and carrying out 28-40KHz ultrasonic treatment for 0.5-1h to obtain the antifouling self-cleaning water-based architectural coating.

Technical Field

The invention relates to a preparation method of an antifouling self-cleaning water-based architectural coating by recycling waste paint residues, belonging to the technical field of recycling of functional renewable materials.

Background

With the development of industrial production, the quantity of industrial waste is increasing day by day, and the quantity is huge, and the variety is great, and the composition is complicated, and the processing is quite difficult, and only limited industrial waste is utilized nowadays. For example, steel slag is used in the united states, sweden, etc., and fly ash and coal slag are used in japan, denmark, etc. Other industrial wastes are mainly stored in a passive manner, and part of harmful industrial solid wastes are treated by methods such as landfill, incineration, chemical conversion, microbial treatment and the like; some of the plants are thrown into the ocean, which not only pollutes the environment, but also generates a large amount of waste.

The economic development mode of recycling renewable resources and continuously recycling materials is becoming a global trend, the strategy of sustainable development is consistently recognized all over the world, and therefore, the development of a new technology for carrying out high-added-value utilization on the coating waste residues again becomes a selectable direction.

Because the waste paint slag of industrial equipment, automobile baking paint and the like has certain hydrophobicity and hardness, the mechanical properties of hydrophobicity, wear resistance and the like can be further improved after technical treatment, and the waste paint slag has good application prospect when being used as a filler of building paint, particularly in the application of real stone paint.

Disclosure of Invention

The invention aims to overcome the defects and provides a preparation method of an antifouling self-cleaning water-based building coating by recycling waste paint residues, so that the modified waste paint residues have excellent hydrophobic property and can be applied to the fields of building materials such as stone paint fillers and building exterior walls.

According to the technical scheme, the preparation method of the antifouling self-cleaning water-based architectural coating by recycling the waste paint residues comprises the steps of modifying and synthesizing the architectural coating filler with the hydrophobic self-cleaning characteristic by utilizing the nano-scale silicon dioxide, siloxane and the waste paint residues; in the modification of the filling material, a silica sol is compounded and hybridized to activate the surfaces of the nano particles, and the nano silicon is coated on the surface of the waste paint slag by utilizing a wet slurry method, so that the modified waste paint slag has excellent hydrophobic property.

The preparation method of the antifouling self-cleaning water-based architectural coating by recycling the waste paint slag comprises the following steps:

(1) pretreatment: taking waste paint slag to be dried in a drying oven for pretreatment; crushing the pretreated waste paint slag by using a powder grinding machine, grinding by using a ball mill, and then sieving;

(2) preparation of component 1: dispersing the powder sieved in the step (1) in water, and grinding and dispersing the powder by using a grinding and dispersing machine to obtain slurry with a finer particle size for later use; is marked as component 1;

(3) preparation of component 2: adding siloxane into ethanol, continuously stirring, reacting for a period of time, adding a silane coupling agent, hydrochloric acid and deionized water, heating, and continuously stirring for reacting to obtain a component 2;

(4) preparation of component 3: adding nano silicon dioxide into ethanol for ultrasonic dispersion; continuously adding siloxane, heating and continuously stirring, adding a nitrogen-containing silane coupling agent, continuously stirring for reaction, finally adding deionized water, and continuously stirring to obtain a component 3;

(5) compounding: compounding the component 1, the component 2 and the component 3 according to a certain proportion, dispersing with ethanol, placing in a container, and stirring at normal temperature; and (3) dropwise adding a silane coupling agent, continuously stirring for reaction, and performing ultrasonic treatment after the reaction to obtain the antifouling self-cleaning water-based architectural coating.

Further, the waste paint slag is industrial equipment baking paint waste slag and/or automobile baking paint waste paint slag.

Further, the silane coupling agent in steps (3) and (5) is a silane coupling agent containing epoxy groups and amino groups.

Further, the silane coupling agent is specifically one of KH560, KH550, KH570, vinyl siloxane or perfluorooctyl siloxane.

Further, the nitrogen-containing silane coupling agent in the step (4) is hexamethyldisilazane.

The step (1) is as follows: placing 8-10g of waste paint residues into a dry and clean conical flask, placing the conical flask into a drying oven with the temperature set at 120-150 ℃, and pretreating for 2-3 h; crushing the pretreated waste paint slag by using a powder grinding machine, and then grinding by using a ball mill; and sieving the ball-milled waste paint slag powder, and controlling the particle size to be 800-2000 meshes.

The step (2) is as follows: dispersing the powder sieved in the step (1) in 20-40g of water, and grinding and dispersing for 5-8h by using a grinding and dispersing machine to obtain 2000-mesh slurry for later use; is marked as component 1.

The step (3) is specifically as follows: adding 2.80-2.90g of siloxane into 25-30g of ethanol, continuously stirring at 500r/min for 300-.

The step (4) is specifically as follows: adding 0.15g of nano silicon dioxide into 25-30g of ethanol, and performing ultrasonic dispersion for 15-25min at 28-40 KHz; continuing to add 2-3g of siloxane, heating to 50-60 ℃, continuously stirring for 10-20min, adding 1.5-1.7g of nitrogen-containing silane coupling agent, stirring for 25-35min at 500r/min of 300-;

further, the nano-silica is specifically fumed silica and/or ultrafine silica with the particle size of 30 nm.

The step (5) is specifically as follows: according to the component 1: and (2) component: the mass ratio of the component 3 is 40-50: 1: 8-10, dispersing with ethanol, and mixing the following raw materials: the mass ratio of the component 2 is 20-30: 1, placing the mixture into a dry and clean three-neck flask; stirring at normal temperature for 500 r/min; dropping a silane coupling agent at a speed of 3-6d/s by using a dropping funnel, wherein the silane coupling agent: the mass ratio of the component 2 is 0.5-1: 1, stirring for 2-3h at 500r/min and carrying out 28-40KHz ultrasonic treatment for 0.5-1h to obtain the antifouling self-cleaning water-based architectural coating.

The invention has the beneficial effects that: in the modification of the filling material, the invention compounds and hybridizes silica sol to activate the surface of nano particles, and the nano silicon is coated on the surface of waste paint slag powder by using a wet slurry method, so that the modified waste paint slag has excellent hydrophobic property, and can be applied to the fields of stone paint filling materials, building external walls and other building materials.

Drawings

FIG. 1 shows the state of water dropping on the modified antifouling self-cleaning water-based architectural coating compressed waste paint slag powder cake.

FIG. 2 is a state where water drops are dropped on the compressed waste paint residue powder cake before modification.

Detailed Description

Example 1

(1) Pretreatment: putting 10g of waste paint residues into a dry and clean conical flask, putting the conical flask into a drying oven with the temperature set to 150 ℃, and pretreating for 2 hours; crushing the pretreated waste paint slag by using a powder grinding machine, and then grinding by using a ball mill; sieving the ball-milled waste paint slag powder, and controlling the particle size to be 2000 meshes;

(2) preparation of component 1: dispersing the powder sieved in the step (1) in 40g of water, and grinding and dispersing for 8 hours by using a grinding and dispersing machine to obtain slurry with a finer particle size, wherein the slurry is marked as a component 1 for later use;

(3) preparation of component 2: adding 2.85g of siloxane MTES into 28g of ethanol, continuously stirring, reacting for 0.5h, adding 1.85g of silane coupling agent KH560, 0.20g of 1mol/L hydrochloric acid and 1.4g of deionized water, setting the temperature to be 50 ℃, and continuously stirring for 3h to obtain a component 2;

(4) preparation of component 3: adding 0.15g of 30nm nano silicon dioxide into 25.5g of ethanol, ultrasonically dispersing for 20min, adding 2g of siloxane TEOS, heating to 50 ℃, continuously stirring for 10min, adding 1.5g of nitrogen-containing silane coupling agent HMDS, stirring for 30min, finally adding 6g of deionized water, and continuously stirring for 6h to obtain a component 3;

(5) compounding: component 1, component 2 and component 3 are compounded according to the proportion of 40g, 1g and 10g, dispersed by 20mL of ethanol and placed in a dry and clean three-neck flask; stirring at normal temperature for 300 r/min; 0.5g of silane coupling agent KH570 is dripped into the waste paint residue through a dropping funnel at the speed of 6d/s, the mixture is stirred for 3 hours at the speed of 300r/min, and the waste paint residue modified hydrophobic filler is obtained after 40KHz ultrasonic treatment for 1 hour.

FIG. 1 is a water droplet state of water droplets falling on the upper surface of a modified antifouling self-cleaning water-based architectural coating compressed waste paint slag powder cake; FIG. 2 is a water droplet state in which water droplets are dropped on the upper surface of the compressed waste paint slag powder cake before modification. As can be seen from fig. 1, the powder surface contact angle is 120 °, and the powder surface is hydrophobic, which is clearly improved as compared with fig. 2.