CN106477995A - A kind of expanded perlite thermal-nsulation plate and preparation method thereof - Google Patents

Abstract

The present invention discloses a kind of expanded perlite thermal-nsulation plate and preparation method thereof, specifically：First will be added to the water nothing aldehyde glue after stirring, in the slurry for adding cement, accelerator and hydrophober to be uniformly mixing to obtain；Then expanded perlite and wood-fibred are poured in slurry, stirring obtains warming plate compound；Finally warming plate compound is loaded mould, compressing rear quicker de-mold, blank conserve 6～10h under field conditions (factors).The preparation method without the need for high temperature sintering, simple production process, can fast demoulding, curing condition is simple, and production cost economy is cheap, warming plate function admirable, with good commercial promise.

Description

A kind of expanded perlite insulation board and preparation method thereof

technical field

The invention belongs to the field of building materials, and in particular relates to an expanded perlite insulation board and a preparation method thereof.

Background technique

Expanded perlite is an inorganic thermal insulation material obtained by roasting perlite at high temperature. Due to its excellent thermal insulation performance, it is widely used in thermal insulation panels. At present, the expanded perlite insulation boards on the market are mostly made of high-temperature sintering and curing processes, which generally have defects such as high thermal conductivity, high water absorption, and poor durability. Therefore, the modification research and development of expanded perlite insulation boards have great significance important practical significance.

The invention patent with the Chinese patent application number 201310577279.5 discloses an expanded perlite external wall insulation board and its preparation method. The main material composed of vitrified expanded perlite and inorganic binder is mixed with water and pressed into a kiln. , roasted at 700-900°C, the energy consumption and cost of the preparation process are relatively high.

The invention patent with the Chinese patent application number 201510198543.3 discloses a new type of expanded perlite insulation board and its preparation method. The expanded perlite insulation board is prepared by particle size grading, compression molding, sintering, and later waterproof treatment. The preparation process is in Sintering at 600°C consumes a lot of energy, and the obtained product has a relatively large dry density and thermal conductivity in specific embodiments, with a maximum dry density of 256kg/m ³ and a maximum thermal conductivity of 0.079W/(m·k) .

The invention patent with the Chinese patent application number 201610277743.2 discloses a modified expanded perlite insulation board and its production method, using cement, fly ash, triethoxysilane, polyacrylate emulsion, modified expanded perlite, Sodium dodecylbenzene sulfonate, additives, PP fibers and water are used as raw materials. This preparation method requires a wide variety of raw materials and a complicated preparation process. It needs to be cured at 20-70°C for 10-24 hours, and the preparation cycle is relatively long.

It can be seen that the preparation of expanded perlite insulation boards in the prior art has the problems of high temperature sintering, harsh curing conditions, long demoulding time and high cost, and unsatisfactory dry density and thermal conductivity of the prepared insulation boards.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides an expanded perlite insulation board and its preparation method to solve the problem of high cost, harsh maintenance conditions, and time required for demoulding due to high-temperature sintering required for the preparation of expanded perlite insulation boards in the prior art. Long and the problem of unsatisfactory dry density and thermal conductivity of the product.

In order to achieve the above technical problems, the present invention provides an expanded perlite insulation board, which includes the following components in parts by weight: 5-25 parts of cement, 2-6 parts of quick-setting agent, water-repellent 4-8 parts, 2-6 parts of formaldehyde-free glue, 80-100 parts of expanded perlite, 10-30 parts of wood fiber, 0.3-0.7 parts of water.

Preferably, the expanded perlite insulation board includes the following components in parts by weight: 10-20 parts of cement, 3-5 parts of quick-setting agent, 5-7 parts of water repellent, 3-5 parts of formaldehyde-free glue, expansion 85-95 parts of perlite, 15-25 parts of wood fiber, and 0.4-0.6 parts of water.

The present invention also provides a method for preparing the above-mentioned expanded perlite insulation board, which specifically includes the following steps:

(1) Put cement, quick-setting agent and water repellent in the mixer, and stir evenly to obtain a powdery mixture;

(2) Add the formaldehyde-free glue into the water and stir evenly, then add the powder mixture in step (1) and stir with a mixer to prepare a slurry;

(3) Pour the expanded perlite and wood fiber into the slurry in step (2), and continue stirring with the mixer to obtain the insulation board mixture;

(4) Put the insulation board mixture into the mold, and quickly release the mold after pressing and molding. The blank is cured under natural conditions for 6-10 hours, and the expanded perlite insulation board is obtained.

Preferably, the quick-setting agent is calcium chloride.

Preferably, the hydrophobic agent is sodium methyl siliconate.

Preferably, the stirring speed is 200-400 r/min, and the stirring time is 5-25 min.

Preferably, the stirring speed is 150-350 r/min, and the stirring time is 5-25 min.

Preferably, the stirring speed is 100-300 r/min, and the stirring time is 5-35 min.

In the present invention, expanded perlite is used as thermal insulation functional aggregate, wood fiber is used as modifier, and cement and formaldehyde-free glue are used as gelling materials. Among them, wood fiber can reduce the bulk density of the insulation board, reduce the shrinkage and expansion of the insulation board system, and improve the ability of the insulation board to prevent freezing and heat. No formaldehyde glue and water-repellent encapsulation and water-repellent effect, effectively protecting the structure from damage. The quick-setting agent can promote the rapid demoulding of the insulation board, and the curing conditions are simple.

Compared with the prior art, the beneficial effects obtained by the present invention are: (1) The thermal conductivity of the thermal insulation board of the present invention is ≤0.052W/(m·k), the dry density is ≤190kg/m ³ , and the volume water absorption is ≤6.5% , flexural strength ≥ 0.38MPa, compressive strength ≥ 0.62MPa. (2) The thermal insulation board of the present invention has corrosion resistance, does not require high-temperature sintering in the preparation process, has a simple production process, can be demolded quickly, has simple maintenance conditions, low production costs, non-toxic and harmless materials, and is conducive to energy saving and environmental protection.

detailed description

The technical solutions of the present invention will be further specifically described below in conjunction with specific embodiments.

Example 1

An expanded perlite insulation board, comprising the following components by weight: 80 parts of expanded perlite, 5 parts of cement, 2 parts of calcium chloride, 4 parts of sodium methyl siliconate, 2 parts of formaldehyde-free glue, and 10 parts of wood fiber , 0.3 parts of water. The production process of the expanded perlite insulation board includes the following steps: (1) Put cement, quick-setting agent calcium chloride and water-repellent sodium methyl siliconate into the mixer according to the ratio of 200r/min Stir at a high speed for 25 minutes, mix and stir evenly to obtain a powder mixture; (2) add formaldehyde-free glue to water, stir with a mixer at a speed of 150r/min for 25 minutes, mix with the powder mixture and then stir to obtain a slurry; (3) Add the expanded pearl Pour the rock and wood fiber into the stirred slurry, and the mixer continues to stir at a speed of 100r/min for 35 minutes to obtain the insulation board mixture; (4) Put the stirred insulation board mixture into the mold, and quickly release the mold after pressing , the billet is cured under natural conditions for 6 hours, and the expanded perlite insulation board is obtained.

After testing, the thermal conductivity of the expanded perlite insulation board in this example is 0.042W/(m·k), the dry density is 174kg/m ³ , the volumetric water absorption is 6.5%, the flexural strength is 0.38MPa, and the compressive strength is 0.38MPa. is 0.62MPa.

Example 2

An expanded perlite insulation board, comprising the following components by weight: 85 parts of expanded perlite, 10 parts of cement, 3 parts of calcium chloride, 5 parts of water repellent, 3 parts of formaldehyde-free glue, 15 parts of wood fiber, 0.4 parts of water share. The production process of the expanded perlite insulation board includes the following steps: (1) Weigh 10 parts of cement, 3 parts of quick-setting agent calcium chloride, and 5 parts of water repellent according to the ratio, and put them into a mixer at 250r Stir for 20 minutes at a speed of 200r/min, mix and stir evenly to obtain a powdery mixture; (2) Add 3 parts of formaldehyde-free glue to 0.4 parts of water and add it to the mixer, and the mixer stirs at a speed of 200r/min for 20min, and mix it with the powdery mixture Stir to obtain slurry; (3) Pour 85 parts of expanded perlite and 15 parts of wood fiber into the stirred slurry, and continue to stir at a speed of 150r/min for 30 minutes to obtain the insulation board mixture; (4) Mix well The mixed material is loaded into the mold, and the mold is quickly demoulded after pressing and forming. The blank is cured for 7 hours under natural conditions, and the expanded perlite insulation board is obtained.

After testing, the thermal conductivity of the expanded perlite insulation board in this example is 0.046W/(m·k), the dry density is 178kg/m ³ , the volumetric water absorption is 6.0%, the flexural strength is 0.40MPa, and the compressive strength is 0.40MPa. The strength is 0.64MPa.

Example 3

An expanded perlite insulation board, comprising the following components by weight: 90 parts of expanded perlite, 15 parts of cement, 4 parts of accelerator, 6 parts of water repellent, 4 parts of formaldehyde-free glue, 20 parts of wood fiber, 0.5 parts of water share. The production process of the expanded perlite insulation board includes the following steps: (1) Weigh 15 parts of cement, 4 parts of quick-setting agent, and 6 parts of water-repellent according to the ratio, and put them into a mixer at a rate of 300r/min. Stir for 15 minutes at a high speed, mix and stir evenly to obtain a powdery mixture; (2) Add 4 parts of formaldehyde-free glue to 0.5 parts of water and add it to the mixer, stir at a speed of 250r/min for 15 minutes, mix it with the powdery mixture and stir to obtain a slurry (3) Pour 90 parts of expanded perlite and 20 parts of wood fiber into the stirred slurry, and the mixer continues to stir at a speed of 200r/min for 25 minutes to obtain the insulation board mixture; (4) The stirred mixture Put it into the mold, demould quickly after pressing and forming, and the blank is cured for 8 hours under natural conditions, and the expanded perlite insulation board is obtained.

After testing, the thermal conductivity of the expanded perlite insulation board in this example is 0.050W/(m·k), the dry density is 186kg/m ³ , the volumetric water absorption is 5.0%, the flexural strength is 0.44MPa, and the compressive strength is 0.44MPa. The strength is 0.68MPa.

Example 4

An expanded perlite insulation board comprises the following components by weight: 95 parts of expanded perlite, 20 parts of cement, 5 parts of accelerator, 7 parts of sodium methyl siliconate, 5 parts of formaldehyde-free glue, 25 parts of wood fiber, water 0.6 parts. The production process of the expanded perlite insulation board includes the following steps: (1) Weigh 20 parts of cement, 5 parts of quick-setting agent, and 7 parts of water-repellent sodium methyl siliconate according to the ratio, and put them into the mixer Stir at a speed of 350r/min for 10min, mix and stir evenly to obtain a powdery mixture; (2) Add 5 parts of formaldehyde-free gum to 0.6 parts of water and add it to the mixer, stir at a speed of 300r/min for 10min, and mix with the powdery mixture After mixing, stir to obtain a slurry; (3) Pour 95 parts of expanded perlite and 25 parts of wood fiber into the stirred slurry, and the mixer continues to stir at a speed of 250r/min for 10 minutes; (4) Mix the mixed The material is loaded into the mold, and the mold is quickly demoulded after pressing and forming. The blank is cured for 9 hours under natural conditions, and the expanded perlite insulation board is obtained.

After testing, the thermal conductivity of the expanded perlite insulation board in this example is 0.048W/(m·k), the dry density is 182kg/m ³ , the volumetric water absorption is 5.5%, the flexural strength is 0.42MPa, and the compressive strength is 0.42MPa. The strength is 0.66MPa.

Example 5

An expanded perlite insulation board comprises the following components by weight: 100 parts of expanded perlite, 25 parts of cement, 6 parts of accelerator, 8 parts of water-repellent agent, 6 parts of formaldehyde-free glue, 30 parts of wood fiber, and 0.7 part of water . The production process of the expanded perlite insulation board includes the following steps: (1) Weigh 25 parts of cement, 6 parts of quick-setting agent, and 8 parts of water-repellent according to the ratio, and put them into a mixer at a rate of 400r/min. Stir at a high speed for 5 minutes, mix and stir evenly to obtain a powdery mixture; (2) Add 6 parts of formaldehyde-free gum to 0.7 parts of water and add it to the mixer, stir at a speed of 350r/min for 5 minutes, mix with the powdery mixture and stir to obtain a slurry (3) Pour 100 parts of expanded perlite and 30 parts of wood fiber into the stirred slurry, and the mixer continues to stir at a speed of 300r/min for 5 minutes; (4) Put the stirred mixture into a mold and press After forming, the mold is quickly demoulded, and the blank is cured for 10 hours under natural conditions, and the expanded perlite insulation board is obtained.

After testing, the thermal conductivity of the expanded perlite insulation board in this example is 0.052W/(m·k), the dry density is 190kg/m ³ , the volumetric water absorption is 4.5%, the flexural strength is 0.46MPa, and the compressive strength is 0.46MPa. The strength is 0.70MPa.

The expanded perlite insulation boards prepared in the above embodiments can be quickly demoulded, easy to maintain, low in thermal conductivity, excellent in mechanical properties, simple in process, low in production cost, conducive to energy saving and environmental protection, and have broad commercial application prospects.

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the present invention can be Modifications or equivalent replacements of the technical solutions without departing from the spirit and scope of the technical solutions of the present invention shall fall within the scope of the claims of the present invention.

Claims (8)

1. a kind of expanded perlite thermal-nsulation plate, it is characterised in that including each component of following weight portion：5～25 parts of cement, rapid hardening 2～6 parts of agent, 4～8 parts of hydrophober, nothing 2～6 parts of aldehyde glue, 80～100 parts of expanded perlite, 10～30 parts of wood-fibred, water 0.3～ 0.7 part.

2. expanded perlite thermal-nsulation plate according to claim 1, it is characterised in that including each component of following weight portion：Water 10～20 parts of mud, 3～5 parts of accelerator, 5～7 parts of hydrophober, nothing 3～5 parts of aldehyde glue, 85～95 parts of expanded perlite, wood-fibred 15 ～25 parts, 0.4～0.6 part of water.

3. a kind of preparation method of expanded perlite thermal-nsulation plate according to claim 1 or claim 2, it is characterised in that specifically include with Lower step：

(1) cement, accelerator and hydrophober are placed in mixer, stir to obtain pulverulent mixture；

(2) will be added to the water nothing aldehyde glue after stirring, mixer stirring in the pulverulent mixture of step (1) is added, is obtained Slurry；

(3) expanded perlite and wood-fibred is poured in the slurry of step (2), mixer continues to be uniformly mixing to obtain warming plate to be mixed Close material；

(4) warming plate compound is loaded mould, compressing rear quicker de-mold, blank conserve 6～10h under field conditions (factors), Expanded perlite thermal-nsulation plate is obtained.

4. the preparation method of expanded perlite thermal-nsulation plate according to claim 3, it is characterised in that：The accelerator is chlorine Change calcium.

5. the preparation method of expanded perlite thermal-nsulation plate according to claim 3, it is characterised in that：The hydrophober is first Base sodium silanolate.

6. expanded perlite thermal-nsulation plate preparation method according to claim 3, it is characterised in that step is stirred described in (1) The speed that mixes is 200～400r/min, the time is 5～25min.

7. expanded perlite thermal-nsulation plate preparation method according to claim 3, it is characterised in that：Step is stirred described in (2) The speed that mixes is 150～350r/min, the time is 5～25min.

8. expanded perlite thermal-nsulation plate preparation method according to claim 3, it is characterised in that：Step is stirred described in (3) The speed that mixes is 100～300r/min, the time is 5～35min.