CN104710159B - Cellulose derivative reinforced light vitrified micro bubble heat insulation material and preparation method thereof - Google Patents

Abstract

The invention discloses a cellulose derivative reinforced light vitrified microsphere thermal insulation material and a preparation method thereof, wherein the raw materials for preparing the cellulose derivative reinforced light vitrified microsphere thermal insulation material comprise, by weight, 1.9-2.7% of sodium carboxymethylcellulose, 36.0-50.3% of glass microspheres, 7.2-10.1% of glass fibers and the balance of water, and the preparation method comprises the steps of mixing and stirring the sodium carboxymethylcellulose and the water until viscous liquid is formed; adding glass beads and glass fibers into a container, adding the obtained viscous liquid, stirring and mixing uniformly, putting the obtained mixture into a mold, compacting, molding, demolding, and drying at the temperature of 90-100 ℃ to obtain the cellulose derivative reinforced light vitrified microsphere thermal insulation material with the characteristics of low density, excellent thermal insulation performance, high mechanical strength and the like.

Description

A kind of lightweight vitrified microbead insulation material reinforced by cellulose derivatives and its preparation method

technical field

The invention relates to a light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives and a preparation method thereof, belonging to the field of thermal insulation materials.

Background technique

With the depletion of the traditional three major fossil energy sources, energy conservation and environmental protection have become an increasingly hot topic. At present, my country's building energy consumption has risen sharply year by year, reaching 45% of the country's total energy consumption, which has caused a huge burden on the development of the national economy. Therefore, building energy saving is imminent. Maintaining the temperature inside the building and reducing its heat loss is an effective way to improve the energy efficiency of the building. At present, the insulation materials used in more than 80% of domestic buildings are mainly organic materials such as expanded polystyrene board (EPS), extruded polystyrene board (XPS), sprayed polyurethane (SPU), and polystyrene particles. There is a fatal shortcoming of flammability, and many large-scale building fire accidents in China in recent years have a lot to do with organic thermal insulation materials. Therefore, there is an urgent need for a thermal insulation material with better performance to better meet the requirements of buildings in terms of energy saving, fire prevention, and thermal insulation.

Contents of the invention

One of the purposes of the present invention is to solve the problem that thermal insulation materials on the market have good fireproof performance but poor thermal insulation performance; The quality of the material increases the strength of the material, thereby providing a light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives that can meet both fire resistance and thermal insulation properties, high compressive strength, and low density.

The second object of the present invention is to provide a method for preparing the above-mentioned cellulose derivative-reinforced light-weight vitrified bead insulation material.

Technical principle of the present invention

Glass microspheres are hollow glass spheres with tiny dimensions. They have excellent thermal insulation and fireproof properties, and are environmentally friendly. They can be used as lightweight filler aggregates and thermal insulation, fireproof and thermal insulation materials in many fields. Glass beads can increase the porosity of the material and reduce the thermal conductivity, which is the main factor affecting the thermal insulation performance of this product;

Sodium carboxymethyl cellulose (CMC) is a cellulose derivative, used as a binder, which can be directly mixed with water to form a paste-like glue to thicken and strengthen;

The glass fiber plays the role of internal reinforcement, increases the mechanical strength of the material, and at the same time prevents the product from cracking during the heating process. In addition, the thermal conductivity of glass fiber is low, which also reduces the overall thermal conductivity to a certain extent.

Vitrified microbeads have excellent thermal insulation and fireproof properties. Sodium carboxymethyl cellulose is a cellulose derivative. Its solution can be used as a binder to increase the strength of the product. Properly change the mixing ratio of each component in the material , so that it has the advantages of low thermal conductivity, high strength, light weight, and not easy to crack and deform after drying. The obtained products meet the requirements of building energy saving and reducing environmental pollution, and the development trend that the state stipulates that A-level non-combustible materials should be used as thermal insulation systems, which can be relaxed to B1-level fireproof materials at most, and can be widely used in thermal insulation systems for building interior and exterior walls.

Technical scheme of the present invention

A light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives. The composition and content of the raw materials used in the preparation process are as follows:

Sodium Carboxymethyl Cellulose 1.9-2.7%

Glass beads 36.0-50.3%

Glass fiber 7.2-10.1%

The remainder is water;

The specific steps of its preparation process are as follows:

(1) Mix sodium carboxymethyl cellulose and water and stir until viscous liquid is formed;

(2.) Add glass microspheres and glass fibers into a stirring container, then add the viscous liquid obtained in step (1), stir and mix evenly to obtain a mixture;

(3) Put the mixture obtained in step (2) into the mold, compact and mold it, then demould it, and then dry it at a controlled temperature of 90-100°C for 4-6 hours to obtain a lightweight glass reinforced with cellulose derivatives. Chemical microbead insulation material.

Beneficial effects of the present invention

Compared with the prior art, the light-weight vitrified bead insulation material reinforced by cellulose derivatives of the present invention has remarkable progress. The present invention uses light inorganic thermal insulation aggregate vitrified microbeads and light organic gel material sodium carboxymethyl cellulose as main raw materials, so the light weight vitrified microbead thermal insulation materials reinforced by cellulose derivatives have light bulk density The advantages.

Further, the light-weight vitrified microbead thermal insulation material reinforced by a cellulose derivative of the present invention, since the vitrified microsphere used is a hollow sphere structure, the light-weight vitrified microbead thermal insulation material reinforced by a cellulose derivative There are countless tiny spherical closed cells, which greatly increases the porosity and improves the heat preservation effect. And compared with the inorganic gel gel material, the strength of the organic gel material sodium carboxymethyl cellulose is higher, and because the sodium carboxymethyl cellulose used is stable to heat, the coagulation time is equivalent to the preparation molding time, so it can be The light-weight vitrified microbead thermal insulation material reinforced by the cellulose derivative can obtain higher strength in a short time without affecting the flame-retardant performance of the lightweight vitrified micro-bead thermal insulation material reinforced by the cellulose derivative.

Further, the light-weight vitrified microbead insulation material reinforced by cellulose derivatives of the present invention is microscopically analyzed, and the results show that sodium carboxymethyl cellulose forms a "connecting bridge" structure between the vitrified microbead spheres, making the vitrified microbeads Connected into a tight whole, the structural strength of this structure is high, and the "connecting bridge" formed by the gel material sodium carboxymethyl cellulose is relatively thin, the contact area between each "connecting bridge" is small, and the heat is mainly blocked by the closed-cell structure , very little loss through sodium carboxymethyl cellulose, so this structure is also beneficial to the thermal conductivity of the lightweight vitrified bead insulation material reinforced by cellulose derivatives.

Further, a cellulose derivative-reinforced light-weight vitrified microbead thermal insulation material of the present invention does not react with the raw materials used in the preparation, so the final obtained cellulose-derivative-reinforced light-weight vitrified microbead The insulation material is durable and has excellent insulation performance, which can replace most organic insulation materials with poor flame retardancy.

The light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives of the invention has the characteristics of low density, excellent thermal insulation performance and high mechanical strength. Moreover, the raw materials used in the preparation are environmentally friendly, have wide sources and are low in price, so the production cost is low, the preparation process is simple, the forming can be completed at normal temperature, safe and reliable, no special equipment is required, and it is suitable for industrial production.

detailed description

The present invention is further illustrated below by specific examples, but the present invention is not limited.

Measurement method of thermal conductivity: steady-state plate method (measurement basis: GB/T 10294-2008 "Steady-state thermal resistance and related characteristics of thermal insulation materials measured by protective plate method"), instrument model: DP-TS1 temperature characteristic tester, produced Manufacturer: Shanghai Shangda Electronic Equipment Co., Ltd.;

The determination of compressive strength is based on the standard: GB/T 7314-2005 "Metallic Materials Compression Test Method at Room Temperature", instrument model: SUN-500 electronic universal testing machine, manufacturer: Shanxi Yusheng Electronic Technology Co., Ltd.

The determination method of density is based on the standard GB/T 5486-2008 "Test Methods for Inorganic Rigid Thermal Insulation Products".

The determination method of flame retardant grade is based on the standard GB 8624-2012 "Classification of Combustion Behavior of Building Materials and Products" and GB/T 5424-2010 "Test Method for Non-combustibility of Building Materials", instrument model: JCSY339 Non-combustibility testing machine for building materials, manufacturer : Dongguan Daxian Automation Instrument Equipment Co., Ltd.

Example 1

A light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives. The composition and content of the raw materials used in the preparation process are as follows:

Sodium Carboxymethyl Cellulose 1.9%

Glass beads 50.3%

Glass fiber 10.1%

The remainder is water;

The specific steps of its preparation process are as follows:

(1) Mix sodium carboxymethyl cellulose and water and stir until viscous liquid is formed;

(2.) Add glass microspheres and glass fibers into a stirring container, then add the viscous liquid obtained in step (1), stir and mix evenly to obtain a mixture;

(3) Put the mixture obtained in step (2) into the mold, compact and mold it, then demould it, and then dry it at a controlled temperature of 100°C for 5 hours to obtain light-weight vitrified microbeads reinforced by cellulose derivatives. Material.

The cellulose derivative-reinforced light-weight vitrified microbead thermal insulation material obtained above has been tested and found to have a thermal conductivity of 0.15W/(m·K), a compressive strength of 2.04MPa, a density of 278.75kg/m ³ , and a flame-retardant grade of A grade.

A flatness detector (instrument model: TS-50 flatness detector, manufacturer: Kunshan Xinpei Environmental Engineering Co., Ltd.) was used to scan the light-weight vitrified bead insulation material reinforced by cellulose derivatives obtained above, and the results Indicates that the surface is smooth and free of cracks.

Example 2

A light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives. The composition and content of the raw materials used in the preparation process are as follows:

Sodium Carboxymethyl Cellulose 2.5%

Glass beads 39.8%

Glass fiber 7.9%

The remainder is water;

The specific steps of its preparation process are as follows:

(1) Mix sodium carboxymethyl cellulose and water and stir until viscous liquid is formed;

(2) Add glass microspheres and glass fibers into a stirring container, then add the viscous liquid obtained in step (1), stir and mix evenly to obtain a mixture;

(3) Put the mixture obtained in step (2) into the mold, compact and mold it, then demould it, and then dry it at a controlled temperature of 100°C for 5 hours to obtain light-weight vitrified microbeads reinforced by cellulose derivatives. Material.

The cellulose derivative-reinforced light-weight vitrified microbead thermal insulation material obtained above has been tested and found to have a thermal conductivity of 0.16W/(m·K), a compressive strength of 2.66MPa, a density of 303.75kg/m ³ , and a flame-retardant grade of A grade. A flatness detector (instrument model: TS-50 flatness detector, manufacturer: Kunshan Xinpei Environmental Engineering Co., Ltd.) was used to scan the light-weight vitrified bead insulation material reinforced by cellulose derivatives obtained above, and the results Indicates that the surface is smooth and free of cracks.

Example 3

A light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives. The composition and content of the raw materials used in the preparation process are as follows:

Sodium Carboxymethyl Cellulose 2.7%

Glass beads 36.0%

Glass fiber 7.2%

The remainder is water;

The specific steps of its preparation process are as follows:

(1) Mix sodium carboxymethyl cellulose and water and stir until viscous liquid is formed;

(2) Add glass microspheres and glass fibers into a stirring container, then add the viscous liquid obtained in step (1), stir and mix evenly to obtain a mixture;

(3) Put the mixture obtained in step (2) into the mold, compact and mold it, then demould it, and then dry it at a controlled temperature of 100°C for 5 hours to obtain light-weight vitrified microbeads reinforced by cellulose derivatives. Material.

The cellulose derivative-reinforced light-weight vitrified microbead thermal insulation material obtained above has been tested and found to have a thermal conductivity of 0.17W/(m·K), a compressive strength of 2.78MPa, a density of 310.00kg/m ³ , and a flame-retardant grade of A grade. A flatness detector (instrument model: TS-50 flatness detector, manufacturer: Kunshan Xinpei Environmental Engineering Co., Ltd.) was used to scan the light-weight vitrified bead insulation material reinforced by cellulose derivatives obtained above, and the results Indicates that the surface is smooth and free of cracks.

Example 4

A light-weight vitrified microbead thermal insulation material reinforced by cellulose derivatives. The composition and content of the raw materials used in the preparation process are as follows:

Sodium Carboxymethyl Cellulose 2.2%

Glass beads 44.4%

Glass fiber 9.0%

The remainder is water;

The specific steps of its preparation process are as follows:

(1) Mix sodium carboxymethyl cellulose and water and stir until viscous liquid is formed;

(2) Add glass microspheres and glass fibers into a stirring container, then add the viscous liquid obtained in step (1), stir and mix evenly to obtain a mixture;

(3) Put the mixture obtained in step (2) into the mold, compact and mold it, then demould it, and then dry it at a controlled temperature of 100°C for 5 hours to obtain light-weight vitrified microbeads reinforced by cellulose derivatives. Material.

The cellulose derivative-reinforced light-weight vitrified microbead thermal insulation material obtained above has been tested and found to have a thermal conductivity of 0.18W/(m·K), a compressive strength of 3.13MPa, a density of 317.50kg/m ³ , and a flame-retardant grade of A grade. A flatness detector (instrument model: TS-50 flatness detector, manufacturer: Kunshan Xinpei Environmental Engineering Co., Ltd.) was used to scan the light-weight vitrified bead insulation material reinforced by cellulose derivatives obtained above, and the results Indicates that the surface is smooth and free of cracks.

In summary, a light-weight vitrified bead insulation material reinforced by cellulose derivatives of the present invention has a thermal conductivity of 0.15-0.18W/(m K), a compressive strength of 2.04-3.13MPa, and a density of 278.75-317.50kg/m ³ , the flame retardant grade reaches A grade, so it has the characteristics of low density, excellent thermal insulation performance and high mechanical strength. Moreover, the raw materials used in the preparation are green and environment-friendly, have wide sources and are low in price, so the production cost is low, the preparation process is simple, no special equipment is needed, and it is suitable for industrialized production.

The foregoing is only an example of the embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and Modifications should also be regarded as the scope of protection of the present invention.

Claims (7)

1. the light vitreous granular thermal insulation material that a cellulose derivative strengthens, it is characterised in that count by weight percentage, raw material composition and content used by its preparation process are as follows for the light vitreous granular thermal insulation material that described cellulose derivative strengthens:

Sodium carboxymethyl cellulose 1.9-2.7%

Glass bead 36.0-50.3%

Glass fibre 7.2-10.1%

Surplus is water；

Its preparation process specifically comprises the following steps that

(1), sodium carboxymethyl cellulose and water being mixed, stirring is until forming thick liquid；

(2), by glass bead and glass fibre add in the container of band stirring, add the thick liquid of step (1) gained, be uniformly mixed, obtain compound；

(3), the compound of step (2) gained is put in mould, the demoulding after compaction moulding, control after the demoulding to be dried at temperature is 90-100 DEG C, obtain the light vitreous granular thermal insulation material that cellulose derivative strengthens.

The light vitreous granular thermal insulation material that a kind of cellulose derivative the most as claimed in claim 1 strengthens, it is characterised in that count by weight percentage, raw material composition and content used by its preparation process are as follows:

Sodium carboxymethyl cellulose 1.9%

Glass bead 50.3%

Glass fibre 10.1%

Surplus is water.

The light vitreous granular thermal insulation material that a kind of cellulose derivative the most as claimed in claim 1 strengthens, it is characterised in that count by weight percentage, raw material composition and content used by its preparation process are as follows:

Sodium carboxymethyl cellulose 2.5%

Glass bead 39.8%

Glass fibre 7.9%

Surplus is water.

The light vitreous granular thermal insulation material that a kind of cellulose derivative the most as claimed in claim 1 strengthens, it is characterised in that count by weight percentage, raw material composition and content used by its preparation process are as follows:

Sodium carboxymethyl cellulose 2.7%

Glass bead 36.0%

Glass fibre 7.2%

Surplus is water.

The light vitreous granular thermal insulation material that a kind of cellulose derivative the most as claimed in claim 1 strengthens, it is characterised in that count by weight percentage, raw material composition and content used by its preparation process are as follows:

Sodium carboxymethyl cellulose 2.2%

Glass bead 44.4%

Glass fibre 9.0%

Surplus is water.

6. the preparation method of the light vitreous granular thermal insulation material that cellulose derivative as described in claim 1-5 is arbitrary strengthens, it is characterised in that specifically include following steps:

(1), sodium carboxymethyl cellulose and water being mixed, stirring is until forming thick liquid；

Glass bead and glass fibre are joined in the container of band stirring by (2), add the thick liquid of step (1) gained, are uniformly mixed, obtain compound；

(3), the compound of step (2) gained is put in mould, the demoulding after compaction moulding, then control to be dried 4-6h at temperature is 90-100 DEG C, obtain the light vitreous granular thermal insulation material that cellulose derivative strengthens.

7. the preparation method of the light vitreous granular thermal insulation material that cellulose derivative as claimed in claim 6 strengthens, it is characterised in that controlling temperature in step (3) is to be dried 5h at 100 DEG C.