CN103058623B - Foamed water glass expanded perlite heat-insulating board - Google Patents

Abstract

The invention provides a foamed water glass expanded perlite heat-insulation board which is formed by pressing and drying modified foamed water glass serving as an adhesive and expanded perlite serving as an aggregate. Wherein the water glass adhesive comprises the following components: sodium water glass, potassium water glass, silica sol, additives, a waterproof agent, a stabilizer and a foaming agent. The insulation board prepared by the invention has low price and wide application range; the density is low and the water resistance is good; the strength is high, and the heat preservation performance is good; through foaming, the use amount is saved, the cost is reduced and the like.

Description

A foamed water glass expanded perlite insulation board

technical field

The invention belongs to inorganic thermal insulation materials, in particular to a foamed water glass expanded perlite thermal insulation board and a preparation method thereof.

Background technique

Thermal insulation materials play an important role in people's daily life and production. At present, most thermal insulation materials on the market are organic thermal insulation materials. However, organic thermal insulation materials will cause some environmental pollution problems during production and use, which are harmful to human health and the environment. cause great harm. Moreover, organic thermal insulation materials have poor high temperature resistance and are easy to burn, so they have poor fire resistance. These shortcomings limit the further application of organic insulation materials. Inorganic thermal insulation materials not only have excellent high temperature resistance, but also do not produce harmful substances to pollute the environment during the production and preparation process. The most widely used inorganic thermal insulation materials are water glass as adhesive and expanded perlite as aggregate. However, the pure water glass adhesive has defects such as poor water resistance, low bonding strength, and long curing time. Therefore, its application is limited.

Contents of the invention

The object of the present invention is to provide a foamed water glass expanded perlite insulation board with reasonable formula and excellent performance. Another object of the present invention is to provide the preparation method of the foamed water glass expanded perlite insulation board.

The technical solution of the present invention is: a foamed water glass expanded perlite insulation board, which is characterized in that it is formed by mixing and pressing water glass adhesive and expanded perlite at a mass ratio of 0.8 to 1.5:1; wherein the water glass glue The components of the adhesive and the percentages of each component in the total weight of the water glass adhesive are: sodium water glass 30%~50%, potassium water glass 20%~40%, silica sol 5%~10%, additive 10% %~15%, waterproofing agent 2%~3%, stabilizer 2%~5%, foaming agent 1%~5%.

Preferably described stabilizer is coupling agent acidic aqueous solution, and coupling agent is silane coupling agent or titanate coupling agent; Wherein silane coupling agent is 3-aminopropyltriethoxysilane, γ-(2, 3-Glycidyloxy)propyltrimethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane base silane, methyl triethoxy silane or vinyl triethoxy silane, titanate coupling agent is isopropyl tris (dioctyl pyrophosphate acyloxy) titanate, isopropyl tris (di octylphosphoryloxy) titanate, isopropyl dioleyl (dioctylphosphonyloxy) titanate or monoalkoxy unsaturated fatty acid titanate; acids are hydrochloric acid, nitric acid, Acetic acid, sulfuric acid, oxalic acid or phosphoric acid; the pH value of the acidic aqueous solution of the coupling agent is 3-5; the preferred additive is high alumina powder, talcum powder, nano-alumina powder or calcium oxide powder; the preferred foaming agent It is hydrogen peroxide, rosin, sodium dodecylbenzenesulfonate or sodium dodecylsulfate; preferably the waterproofing agent is organic silicon waterproofing agent or sodium methyl silicate; the average particle diameter of the preferred aggregate expanded perlite is 1.25~1.45mm.

The present invention also provides the preparation method of the above foamed water glass expanded perlite insulation board, the specific steps are as follows: ①. Sodium water glass and potassium water glass are heated and stirred in a water bath; ②. Silica sol is added, and the water bath is heated and stirred; ③. Slowly add waterproofing agent and stabilizer, heat and stir in water bath; ④. Add additives and foaming agent, heat and stir in water bath, ⑤ pour out, mix with expanded perlite, compress and mold, and dry at 130°C-200°C.

The heating temperature of the water bath in the preferred step ① is 65-80 ° C; the stirring speed is 500-1500 rpm, and the stirring time is 5-10 minutes; the heating temperature of the water bath in step ② is 45-80 ° C; the stirring speed is 500-1500 rpm / min, stirring time is 5-10 minutes; step ③ water bath heating temperature is 45-80 ℃; stirring speed is 500-1500 rpm, stirring time is 15-35 minutes; step ④ water bath heating temperature is 45- 80°C; the stirring speed is 500-1500 rpm, and the stirring time is 15-30 minutes.

In the present invention, modified water glass is used as a binder, expanded perlite is used as an aggregate, and the thermal insulation board is obtained by drying. Potassium water glass and sodium water glass are mixed because potassium water glass has better collapsibility and better water resistance, and these shortcomings of sodium water glass can be improved. The addition of silica sol is to increase the bonding strength of the adhesive. Stabilizers are used to make the rubber compound store for a long time, prevent the rubber compound from curing, and also improve the water resistance of the adhesive. High alumina powder can improve the temperature resistance of the rubber compound and the compactness of the binder. The foaming agent can improve the strength, reduce the use of adhesives, reduce the dry density and reduce the cost. Use expanded perlite with a particle size of 1.25~1.45mm to reduce the surface area and reduce the amount of water glass added.

Beneficial effect:

(1), low price, wide range of applications;

(2), low density, good water resistance;

(3), high lightness, good thermal insulation performance;

(4) After foaming, the dosage is saved and the cost is reduced.

Detailed ways

For ease of description, the amounts of each component of the raw materials are weight percentages. The average particle size of perlite in the following examples is 1.25~1.45mm.

Example 1

The composition of the inorganic binder raw materials in this example is as follows:

Sodium water glass 33.95% Potassium silicate 39.30% Silica sol 7.32% Silicone waterproofing agent NYY 2.05% Vinyltriethoxysilane Aqueous solution of acetic acid (pH=5) 4.03% High aluminum powder 11.92% rosin 1.46%

The preparation process is as follows:

1. Mix sodium water glass and potassium water glass in a water bath, heat at 80°C, stir at 1000 rpm, and stir for 15 minutes to heat and age for modification. Cool to room temperature and set aside.

2. Add silica sol and stir for 5 minutes.

3. Slowly add waterproofing agent and stabilizer, and stir for 25 minutes.

4. Add high alumina powder and cement foaming agent, stir for 20 minutes, (step 2-4 water bath heating temperature is 50 ℃, and the speed is 1000 rpm);

5. Pour out, mix and stir with expanded perlite at a mass ratio of 0.83:1, and press to form. Put it in an oven, dry at 150°C for 2.5 hours and take it out.

The prepared sodium silicate expanded perlite insulation board has a density of 175-185Kg/m3 and a compressive strength of ≥0.7Mpa. The thermal conductivity is 0.04-0.06W/m.k.

Example 2

Sodium water glass 45.95% Potassium silicate 23.30% Silica sol 5.32% Sodium methyl silicate 2.95% Vinyltriethoxysilane Acetic acid aqueous solution (pH=3.2) 4.95% High aluminum powder 14.72% Hydrogen peroxide foaming agent 2.56%

The preparation process is as follows:

1. Sodium water glass and potassium water glass were mixed and stirred for 15 minutes for heating and aging modification. The whole preparation process was heated in a water bath at 80° C., and the stirring speed was 1000 rpm. Cool to room temperature and set aside.

2. Heat and stir the modified water glass in a water bath, add silica sol, and stir for 5 minutes.

3. Slowly add waterproofing agent and stabilizer, and stir for 25 minutes.

4. Add high alumina and then drop hydrogen peroxide foaming agent, stir for 20 minutes, (step 2-4 water bath heating temperature is 60 ℃, and the speed is 1000 rpm)

5. Then pour it out, mix and stir with expanded perlite 0.83:1, and press to form.

6. Put it in the oven, dry at 200°C for 2 hours and take it out.

The prepared insulation board has a density of 168-170Kg/m ³ , a compressive strength ≥ 0.45Mpa, and a thermal conductivity ≤ 0.05 W/mk.

Example 3

Sodium water glass 49.95% Potassium silicate 20.30% Silica sol 9.32% Silicone Water Repellent 2.98% KH560 Oxalic Acid Aqueous Solution (pH=5) 2.03% talcum powder 14.72% rosin 1.46%

The preparation process is as follows:

1. Mix sodium water glass and potassium water glass and stir for 15 minutes to heat and age for modification. Heating in a water bath at 65°C, with a stirring speed of 1000 rpm. Cool to room temperature and set aside.

2. Heat the modified water glass in a water bath and stir; add silica sol and stir for 5 minutes.

3. Slowly add waterproofing agent and stabilizer, and stir for 25 minutes.

4. Add talcum powder and rosin foaming agent, stir for 20 minutes, (step 2-4 water bath heating temperature is 70 ℃, speed is 1200 rpm), then pour it out, mix with expanded perlite 0.83:1, Pressing.

5. Put it in the oven, dry at 150°C for 2.5 hours and take it out.

The prepared sodium silicate expanded perlite insulation board has a density of 180-185Kg/m ³ and a compressive strength ≥ 0.7Mpa. The thermal conductivity is 0.04-0.06W/mk.

Example 4

The preparation process is as follows:

1. Mix sodium water glass and potassium water glass and stir for 15 minutes to heat and age for modification. The whole preparation process was heated in a water bath at 80° C., and the stirring speed was 1000 rpm. Cool to room temperature and set aside.

2. Heat the modified water glass in a water bath, stir, add silica sol, and stir for 5 minutes.

3. Slowly add waterproofing agent and stabilizer, and stir for 25 minutes.

4. Add high alumina powder and sodium lauryl sulfate foaming agent, stir for 20 minutes, (the heating temperature of the water bath in steps 2-4 is 50°C, and the speed is 1500 rpm)

5. Then pour it out, mix and stir with expanded perlite at a mass ratio of 0.83:1, and press to form.

6. Put it in the oven, dry at 150°C for 2.5 hours and take it out.

The prepared sodium silicate expanded perlite insulation board has a density of 180-185Kg/m ³ , a compressive strength ≥ 0.75MPa, and a thermal conductivity of 0.045-0.065W/mk.

Example 5

The preparation process is as follows:

1. Mix sodium water glass and potassium water glass and stir for 15 minutes to heat and age for modification. The water bath was heated to 70°C, and the stirring speed was 1200 rpm. Cool to room temperature and set aside.

2. Heat the modified water glass in a water bath and stir for 15 minutes. Add the silica sol and stir for 10 minutes.

3. Slowly add stabilizer and stir for 25 minutes.

4. Add nano-alumina powder and rosin foaming agent, stir for 20 minutes, (step 2-4 water bath heating temperature is 80 ℃, speed is 1000 rpm)

5. Then pour it out, mix and stir with expanded perlite at a mass ratio of 1.2:1, and press to form.

6. Put it in the oven, dry at 180°C for 2 hours and take it out.

The prepared sodium silicate expanded perlite insulation board has a density of about 180kg/ ^m3 , a compressive strength of ≥0.7Mpa, a flexural strength of ≥0.32Mpa, and a thermal conductivity of 0.04-0.06W/mk.

Example 6

The preparation process is as follows:

1. Mix sodium water glass and potassium water glass and stir for 15 minutes to heat and age for modification. Heat in a water bath to 80°C, and the stirring speed is 1000 rpm. Cool to room temperature and set aside.

2. Heat the modified water glass in a water bath and stir for 10 minutes. Add the silica sol and stir for 5 minutes.

3. Slowly add stabilizer and stir for 35 minutes.

4. Add high aluminum powder and sodium dodecylbenzenesulfonate foaming agent, stir for 30 minutes, (step 2-4 water bath heating temperature is 50 ℃, speed is 1000 rpm)

5. Pour out, mix and stir with expanded perlite 0.83:1, and press to form.

6. Put it in an oven, dry at 200°C for 2.5 hours and take it out.

The prepared sodium silicate expanded perlite insulation board has a density of about 152kg/ ^m3 , a compressive strength of ≥0.58Mpa, a flexural strength of ≥0.31Mpa, and a thermal conductivity of 0.05-0.06W/mk.

In the insulation board in the present invention, each component and its usage amount are not limited to the examples listed above.

Claims (2)

1. A method for preparing foamed water glass expanded perlite insulation board, which is formed by mixing and pressing water glass adhesive and expanded perlite in a mass ratio of 0.8 to 1.5:1; wherein the water glass adhesive composition and the percentages of each component in the total weight of the water glass adhesive are: 30% to 50% of sodium water glass, 20% to 40% of potassium water glass, 5% to 10% of silica sol, 10% to 15% of additives, 2% to 3% waterproofing agent, 2% to 5% stabilizer, and 1% to 5% foaming agent; the specific steps are as follows: ①. Sodium silicate and potassium silicate water bath heating and stirring; ②. Add silica sol, water bath Heat and stir; ③. Add waterproofing agent, stabilizer, heat and stir in water bath; ④. Add additives and foaming agent, heat and stir in water bath, ⑤ Pour out, mix with expanded perlite, compress and mold, and bake at 130°C-200°C dry, that is, the foamed water glass expanded perlite insulation board is obtained; the heating temperature of the water bath in step ① is 65-80°C; the stirring speed is 500-1500 rpm, and the stirring time is 5-10 minutes; the water bath in step ② The heating temperature is 45-80°C; the stirring speed is 500-1500 rpm, and the stirring time is 5-10 minutes; the heating temperature of the water bath in step ③ is 45-80°C; the stirring speed is 500-1500 rpm, and the stirring time is 15-35 minutes; the heating temperature of the water bath in step ④ is 45-80° C.; the stirring speed is 500-1500 rpm, and the stirring time is 15-30 minutes. 2. The method according to claim 1, wherein the stabilizing agent is an acidic aqueous solution of a coupling agent, and the coupling agent is a silane coupling agent or a titanate coupling agent; wherein the silane coupling agent is 3-ammonia Propyltriethoxysilane, γ-(2,3-glycidoxy)propyltrimethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, N-(β-aminoethyl Base)-γ-aminopropyl trimethyl (ethyl) oxysilane, methyl triethoxy silane or vinyl triethoxy silane, titanate coupling agent is isopropyl tri (dioctyl pyrophosphate oxy) titanate, isopropyl tris(dioctyl phosphate acyloxy) titanate, isopropyl dioleoyl acyl (dioctyl phosphate acyloxy) titanate or monoalkoxy Unsaturated fatty acid titanate; the acid is hydrochloric acid, nitric acid, acetic acid, sulfuric acid, oxalic acid or phosphoric acid; the pH value of the acidic aqueous solution of the coupling agent is 3-5; the additives are high alumina powder, talc powder, and nano-alumina powder Or calcium oxide powder; the foaming agent is hydrogen peroxide, rosin, sodium dodecylbenzenesulfonate or sodium dodecyl sulfate; the waterproofing agent is silicone waterproofing agent; the average particle size of expanded perlite is 1.25-1.45mm.