CN103539415B - Preparation method of kaolin geopolymer-based regenerated EPS (Expandable Polystyrene) insulating material of exterior wall of building - Google Patents

Abstract

The invention discloses a preparation method of a kaolin soil polymer-based regenerated EPS building exterior thermal insulation material. The main components include kaolin polymer cementitious material, recycled EPS core-shell masterbatch. The preparation process includes the following steps: 1) high-temperature calcination of kaolin to prepare metakaolin, 2) preparation of recycled EPS core-shell masterbatch, 3) preparation of alkali activator, and 4) preparation of thermal insulation material. Due to the use of geopolymer cementitious materials instead of traditional cement, and the use of waste polystyrene foam as the main body of heat preservation, the improved kaolin-based polymer-based recycled EPS building exterior insulation material of the present invention has low cost and high production process. Environmental protection and other advantages.

Description

Preparation method of kaolin polymer-based recycled EPS building exterior wall insulation material

technical field

The invention relates to the field of external thermal insulation materials for building exterior walls, in particular to a method for preparing kaolin polymer-based recycled EPS thermal insulation materials for building exterior walls.

Background technique

Geopolymers were first discovered by French scientist J.Davidovits in the 1970s, and the concept of geopolymers was first proposed in his US patent in 1985. The performance of geopolymer is similar to that of cement, but it is superior to cement, especially its high temperature resistance, durability, rapid hardening and early strength, fixing (solid sealing) metal ions and green environmental protection performance have attracted people's attention, and it has a good The application prospect, and the energy consumption in the preparation process is low, unlike cement (clinker), which requires high-temperature calcination, and releases a large amount of CO ₂ in the production process. In the literature, minerals or industrial wastes containing aluminosilicates are usually used as raw materials for the preparation of geopolymers. There are many proven reserves of kaolin in my country, covering 21 provinces (cities, districts), among which Guangdong Province is the province with the most proven reserves of kaolin resources, and its reserves of kaolin resources account for the national total. 30.9%, followed by Shaanxi, Fujian, Jiangxi, Guangxi, Hunan and Jiangsu. Therefore, the development of kaolin polymer cementitious materials has special significance in our country.

Under the background of environmental protection and green environment in today's world, the development of construction industry is gradually tending to energy saving and low consumption. The improvement of wall structure thermal insulation and energy saving has naturally become the focus of many countries in building energy conservation. There are two main forms of exterior wall insulation technology: exterior wall interior insulation technology and exterior wall exterior insulation technology. Compared with the internal thermal insulation technology, the external thermal insulation technology of the external wall is reasonable and has its obvious advantages. No matter in the case of the same insulation material specification, size, or similar performance, the external thermal insulation effect of the external wall is better than that of the internal thermal insulation. my country began to introduce EPS external thermal insulation technology in the late 1980s and early 1990s, and carried out pilot research and promotion of use, and prompted my country to promulgate the "Technical Regulations for External Wall External Thermal Insulation Engineering" in 2005, becoming a building external insulation technology recognized by my country. Insulation system. According to the survey in 2009, in the application of building exterior wall insulation technology, EPS external insulation technology accounts for 17.0%; in the use of civil building exterior wall, it accounts for 3.5%, and it is growing at a rate of 17.0%-18.0% every year. In recent years, among the many external wall insulation technologies used in the field of building energy conservation in my country, EPS external thermal insulation technology has always been the external thermal insulation technology with the highest utilization rate. It is also the energy-saving technology that is considered first. Among the EPS external wall insulation materials, EPS particles are mainly used as the light aggregate and the main body of insulation, and the cementitious material is selected from cement, and then added with external additives. If waste polystyrene foam is used as raw material, cement is replaced by a new type of green environmental protection material - geopolymer cementitious material, and the preparation of recycled EPS insulation material will be a very meaningful research topic.

Based on the above research ideas, the present invention proposes a preparation method of kaolin polymer-based recycled EPS building exterior wall thermal insulation material. The thermal insulation material prepared by the present invention has the characteristics of simple preparation method, excellent mechanical properties, and excellent thermal insulation performance.

Contents of the invention

The object of the present invention is to provide a kind of preparation method of kaolin soil polymer-based regenerated polystyrene foam particle (EPS) building exterior wall insulation material, to replace the traditional cement-based polystyrene particle building exterior insulation material with serious pollution.

The specific steps are:

1. Calcinate kaolin at 550-650°C for 4-8 hours, then pulverize it with a ball mill, and pass it through a 40-mesh sieve to obtain metakaolin with a bulk density of 0.6g/cm ³ .

2. Crushing waste polystyrene foam plastics to obtain polystyrene foam particles (EPS) with a bulk density of 0.012 g/cm ³ .

3. Weigh 2-4g of polystyrene foam particles (EPS) prepared in step (2) with a volume of 200-300mL, put them into a plastic beaker, add 6-9mL of the analytical solution prepared at a volume ratio of 1:1 The mixed liquid of pure triethanolamine and the redispersible emulsion with a mass percentage concentration of 40% was stirred evenly, and then 12 g of metakaolin prepared in step (1) was added, and added while stirring, to obtain modified EPS.

4. Transfer the modified EPS obtained in step (3) into a paper cup, put it in an oven, and dry it at 50°C for 24 hours to obtain the recycled EPS core-shell masterbatch.

5. Mix 70.4mL of industrial grade water glass with a modulus of 3.26 and 14.8g of NaOH to obtain a water glass with a modulus of 1.4.

6. Pour 200-250g of the metakaolin obtained in step (1) and 200-300mL of the EPS core-shell masterbatch obtained in step (4) into the mortar mixer, and then slowly add 65-75 mL of the obtained modulus in step (5). 1.4 Water glass solution (as alkali activator) and 25-35mL water, stir evenly to get thermal insulation mortar.

7. Pour the thermal insulation slurry obtained in step (6) into the prepared mold, smooth it, and cure it at room temperature for 1 day, demould, and continue curing for 4 days to obtain the thermal insulation material.

In the present invention, the traditional cement is replaced by the geopolymer cementitious material, and waste polystyrene foam is used as the heat preservation body, so that the improved kaolin-based polymer-based recycled EPS building exterior insulation material of the present invention has low cost, The production process has the advantages of environmental protection and so on.

Detailed ways

Example:

1. Kaolin was calcined at 600°C for 6 hours, then pulverized by a ball mill, and passed through a 40-mesh sieve to obtain metakaolin with a bulk density of 0.6g/cm ³ .

2. Crushing waste polystyrene foam plastics to obtain polystyrene foam particles (EPS) with a bulk density of 0.012 g/cm ³ .

3. Weigh 3g of polystyrene foam particles (EPS) prepared in step (2) with a volume of 250mL and put them into a plastic beaker, add 7.5mL of analytically pure triethanolamine prepared at a volume ratio of 1:1 and The mixed solution of the redispersible emulsion with a percentage concentration of 40% was stirred evenly, and then 12 g of metakaolin prepared in step (1) was added, and added while stirring, to obtain modified EPS.

4. Transfer the modified EPS obtained in step (3) into a paper cup, put it in an oven, and dry it at 50°C for 24 hours to obtain the recycled EPS core-shell masterbatch.

5. Mix 70.4mL of industrial grade water glass with a modulus of 3.26 and 14.8g of NaOH to obtain a water glass with a modulus of 1.4.

6. Pour 225g of the metakaolin obtained in step (1) and 250mL of the EPS core-shell masterbatch obtained in step (4) into the mortar mixer, and then slowly add 72 mL of the water glass solution with a modulus of 1.4 obtained in step (5) (as Alkali activator) and 30mL water, stir evenly to obtain thermal insulation mortar.

7. Pour the thermal insulation slurry into the prepared mold (4cm×4cm×16cm), smooth it, cure it at room temperature for 1 day, remove the mold, and continue curing for 4 days to obtain the thermal insulation material.

Claims (1)

1. a preparation method for kaolin ground polymers base regenerated polystyrene foam beads and EPS architecture exterior wall insulating materials, is characterized in that concrete steps are:

(1) kaolin is calcined 4-8 hour at 550-650 DEG C, then pulverized by ball mill, cross 40 mesh sieve, obtained tap density is 0.6g/cm ³metakaolin;

(2) waste polystyrene foamed plastics is broken, acquisition tap density is 0.012g/cm ³polystyrene foam particles and EPS;

(3) take 2-4g, EPS that step (2) that volume is 200-300mL is obtained puts into plastic beaker, add the mixed solution that the 6-9mL analytical pure trolamine that 1:1 is formulated by volume and mass percent concentration are the redispersible emulsion of 40%, stir, add the metakaolin that 12g step (1) is obtained again, add while stirring, obtain modified EPS;

(4) modified EPS that step (3) obtains is transferred in dixie cup, puts into baking oven, dry 24 hours at 50 DEG C, namely obtain regenerating EPS nuclear shell master batch;

(5) by 70.4mL modulus be 3.26 industrial-grade sodium silicate mix with 14.8g NaOH, obtain the water glass that modulus is 1.4;

(6) EPS nuclear shell master batch of the metakaolin of 200-250g step (1) gained and 200-300mL step (4) gained is poured in mortar mixer, the modulus slowly adding 65-75 mL step (5) gained is again 1.4 water glass solutions and 25-35mL water, stirs and obtains thermal insulation mortar;

(7) heat preservation slurry of step (6) gained is poured in ready mould, floating, maintenance 1 day under normal temperature condition, the demoulding, then continue maintenance 4 days, obtain architecture exterior wall insulating materials.