WO2013026247A1

WO2013026247A1 - Glass fiber chopped strand mat, preparation method, and core material for vacuum heat insulating plate

Info

Publication number: WO2013026247A1
Application number: PCT/CN2011/084968
Authority: WO
Inventors: 杨胜利; 洪国莹; 陈桂花
Original assignee: 福建赛特新材股份有限公司
Priority date: 2011-08-22
Filing date: 2011-12-30
Publication date: 2013-02-28
Also published as: CN102953230A; CN102953230B

Abstract

A glass fiber chopped strand mat uses glass fibers with the length being 4-25 mm and the fiber diameter being 5-15 um, is manufactured by adding a thickener, a dispersant and a defoamer to form a slurry dehydrated and dried, and has the thickness being 0.1-2.0 mm. The glass fibers are scraps of glass fiber manufacturers. A preparation method of the glass fiber chopped strand mat uses the papermaking process in the paper-manufacturing process to prepare the glass fiber chopped strand mat. With the same production method being used, the manufacturing costs of the core material of the present invention are obviously decreased, by 10-50%, and the thermal conductivity of the vacuum heat insulating plate made in this way is decreased by 25%-65%.

Description

Glass fiber chopped strand mat, preparation method and core material for vacuum insulation board

Technical field

The invention relates to a glass chopped strand mat, and a preparation method and application of the chopped strand mat.

Background technique

Glass fiber chopped strand mat is a main glass fiber non-woven reinforcing material, which is short-cut into continuous glass fiber to about 50mm, non-directional uniform distribution, powder or emulsion as adhesive, and deposited by felting. . It is characterized by low cost, but it is easy to cause breakage during large-area construction, and thus becomes the largest reinforcing material in the glass fiber reinforced polymer hand lay-up process, and is also widely used in mechanical forming processes such as winding and molding.

The vacuum insulation board is an upgraded product of the insulation material, and the core material is various, and a fiber or a porous medium material having excellent heat resistance is generally selected. According to the material of the core material, there are glass fiber (glass fiber VIP), open-cell polyurethane foam (open hole PU-VIP), open-cell polystyrene foam (open-cell PS-VIP), open-cell phenolic foam (opening) PF-VIP), fumed silica powder (silicon powder VIP), aerogel (aerogel VIP). At present, several patents have proposed different schemes, such as: patent number ZL 200410058742.6, ZL 00106049.X, ZL 200710031196.0, and the like.

In the vacuum insulation panel, the selection of the core material is very important. In addition to being used as a supporting material, it can also limit the movement space of some gas molecules remaining in the vacuum insulation panel, thereby preventing convection and gas conduction. . In addition, it can also absorb and scatter infrared radiation. In recent years, the successful development and large-scale commercialization of vacuum insulation panels with ultra-fine glass wool as the core material, the thermal conductivity of vacuum insulation panels is generally 3.5 to 4 mW/m•K. Ultrafine glass wool belongs to a category of glass fibers and is an artificial inorganic fiber produced by flame spraying a molten glass liquid. The ultra-fine glass wool fiber has an average diameter of not more than 4 micrometers (product is not more than 6 micrometers), is easily inhaled by the human body, and cannot be decomposed by itself in the lung after inhalation. Therefore, glass fibers having a fiber diameter of less than 4 μm have been banned internationally. Chinese patent number is ZL In the patent of 200410058742.6 "Production method of core material for vacuum insulation material", the inorganic fiber used has an average diameter of 3 to 5 μm and is located at the edge of a fiber diameter of 4 μm, and is not suitable for environmental protection.

Nowadays, all countries in the world are striving to build a conservation-oriented and environment-friendly society. As a result of the continuous development of national economies, more and more attention is paid to environmental protection and resource recycling. In the process of producing long and short glass fibers and preparing various glass fiber products, defective products and corner scraps are often produced. How to use corner scraps, improve material utilization to reduce secondary pollution to the environment, and how to reduce the cost of processing waste in enterprises has become the focus of attention of enterprises in various countries.

In summary, finding or developing a new type of material can not only meet the requirements of international and domestic environmental protection, but also effectively use resources, improve comprehensive utilization rate, and even turn waste into treasure, open up application fields, and create economic and social benefits. the trend of.

Summary of the invention

The invention aims to solve the above problems, and develops a glass fiber chopped strand mat, provides a preparation method of glass fiber chopped strand mat, and opens up a new application field of glass fiber chopped strand mat, namely for vacuum insulation. The core material of the plate further provides a vacuum insulation panel.

The glass fiber chopped strand mat of the present invention is selected from glass fibers, preferably having a length of 4 to 25 mm and a fiber diameter of 5 to 15 μm, and is formed into a slurry by adding a thickener, a dispersing agent and an antifoaming agent, and is dehydrated and dried. Made of dry, the thickness is 0.1 ~ 2.0mm; the above glass fiber is the corner scrap of the glass fiber production enterprise.

The preparation method of the glass fiber chopped strand mat provided by the invention is obviously different from the existing method for preparing the glass fiber mat by using the surface felt device, that is, the glass fiber chopped strand mat is prepared by the papermaking process in the papermaking process, and the invention can be called The wet preparation method includes the following steps:

(1) a glass fiber chopped strand having a preferred length of 4 to 25 mm and a fiber diameter of 5 to 15 μm, a thickener, a dispersing agent, and an antifoaming agent, which are put into a beater after being compounded, and are beaten and dispersed;

(2) uniformly arranging the slurry through a conveying device on a filter net of a single-mesh forming machine, and then performing forced vacuum dewatering and setting to obtain a wet continuous glass fiber chopped strand mat;

(3) conveying the wet continuous glass fiber chopped strand mat into an oven, drying at a temperature of 100-250 ° C, and conveying to a cutting area for cutting to obtain a sheet core material meeting the size requirement;

(4) Stack the continuous glass fiber chopped strand mats of the same size for use.

Wherein, after the shaped core material mentioned in the step (3) is shaped, the thickness thereof is 0.1 to 2.0 mm;

The new field of application of the glass chopped strand mat developed by the present invention refers to the core material of the product of the present invention for use in a vacuum insulation panel, and further provides a vacuum insulation panel.

The invention provides a vacuum insulation panel, which is composed of a core material provided by the invention, a getter or adsorbent, and a closed high barrier packaging bag. The core material is laminated by a plurality of sheet-shaped glass fiber chopped strand mats. composition. Such a vacuum insulation panel is prepared as follows: firstly, the wet-prepared glass fiber chopped strand mat is placed in a heat treatment furnace and heated, the maximum temperature is 120-220 ° C; when the temperature rises to a set value of 120 After -220 ° C, the temperature is kept for 30-240 min, then the heat treatment furnace is opened to take out the glass chopped strand mat; the laminated glass fiber chopped strand mat is placed into the high barrier packaging bag according to the thickness requirement, and the getter is placed in a specific position, and then The high-barrier packaging bag with the glass chopped strand mat is placed in a pre-set vacuum sealing machine for sealing to obtain a vacuum insulation panel, and finally the vacuum sealing machine is opened, and the vacuum insulation panel is taken out.

Compared with the existing vacuum insulation board, the glass fiber chopped strand mat of the invention is used for the core material of the vacuum insulation board, and under the premise of adopting the same production mode, the production cost of the core material is significantly reduced, and the drop rate can reach 10%. ~50%; and the thermal conductivity of the vacuum insulation panel thus produced is reduced by 25% to 65%.

Compared with the existing glass fiber mat, the glass fiber chopped strand mat of the present invention and the existing glass fiber mat are used for the core material of the vacuum insulation board, and the thermal conductivity of the vacuum insulation board thus obtained is compared. There are significant differences. The main reason is that the glass fiber chopped strands of the glass fiber chopped strand material of the invention are non-twisted glass fiber long yarns (formed by bundles of monofilaments drawn from numerous leaking plates) and cut into a certain length by a cutting machine. Therefore, the aspect ratio of the chopped strands is stable, and a relatively uniform core structure can be obtained; and the glass fibers in the existing glass fiber mat raw materials are usually blown by flame method or centrifugally. The length-diameter ratio of the glass fiber obtained by the two methods fluctuates greatly and is unstable, and the obtained core material structure is relatively disordered and irregular.

In addition, the traditional glass chopped strand mat can not be used as the core of the vacuum insulation board, because the preparation process generally adopts the sizing process to increase the strength of the felt, and the glue used is mostly easy to deflate under vacuum, which seriously affects The heat-resisting property of the VIP; and the glass fiber chopped strand mat of the present invention uses a thickener as a felt forming agent, and the thickener is characterized in that it is deflated under vacuum and has a shaping effect, and the obtained vacuum is obtained. The insulation board can still obtain better initial value and retention without adding a getter.

detailed description

The invention is further illustrated by the following examples.

Example 1

The novel glass fiber chopped strand mat of the present invention has the following wet preparation process:

(1) a glass fiber chopped strand having a preferred length of 6 mm and a fiber diameter of 9 μm, a thickener, a dispersing agent, an antifoaming agent, and a compounding agent are put into a beater for beating and dispersing;

(2) uniformly arranging the slurry suitable for a certain quality through the conveying device on the filter net of the single-mesh forming machine, and then performing forced vacuum dewatering and setting to obtain a wet continuous glass fiber chopped strand mat;

(3) conveying the wet continuous glass fiber chopped strand mat to an oven of 100-250 ° C for drying, and conveying to a cutting area for cutting to obtain a sheet core material meeting the size requirement;

Wherein the shaped core material mentioned in the step (3) has a thickness of 0.2 mm;

Example 2

The glass fiber chopped strand mat of the invention is used for the core material of the vacuum insulation board, and the preparation process of the vacuum insulation board is as follows:

(1) The new glass fiber chopped strand mat of Example 1 is placed in a heat treatment furnace and heated, the maximum temperature is 170 ° C;

(2) When the temperature rises to the set value of 170 ° C and then keep warm for 60 min, open the heat treatment furnace to take out the new glass fiber chopped strand mat;

(3) The laminated glass fiber chopped strand mat is placed in a high barrier packaging bag according to the thickness requirement, and the getter is placed in a specific position;

(4) placing a high-barrier packaging bag with a glass chopped strand mat into a pre-set vacuum sealing machine for sealing to obtain a vacuum insulation panel;

(5) Open the vacuum sealer and take out the vacuum insulation board.

The key indicators of the vacuum insulation panel of this embodiment - thermal conductivity and cost comparison are as follows:

Comparison 1:

项目 project	本实施例真空绝热板 Vacuum insulation board of the embodiment	超细玻璃棉芯材真空绝热板 Ultra-fine glass wool core vacuum insulation board
导热系数（ mW/m.k ） Thermal conductivity (mW/m.k)	1.5 1.5	3.5 3.5
成本降低（ % ） Reduce costs( % )	50 50	--- ---

Comparison 2:

项目 project	本实施例真空绝热板 Vacuum insulation board of the embodiment	传统玻璃纤维毡芯材真空绝热板 Traditional glass fiber felt core vacuum insulation board
导热系数（ mW/m.k ） Thermal conductivity (mW/m.k)	1.2~2.5 1.2~2.5	4.0 ～7 4.0 to 7

Example 3

The glass fiber chopped strand mat of the present invention has a wet preparation process as follows:

(1) 50 Kg of an alkali-free glass fiber chopped strand having a preferred length of 6 mm and a fiber diameter of 9 μm and a thickener (chemical name: hydroxypropylmethylcellulose) 1.2 kg, dispersant (chemical name: fatty alcohol polymerization) Oxyethylene ether silane) 1.2Kg, defoamer (organopolysiloxane mixture) 5g, other additives (preservative: chlorothalonil or sodium nitrite) 4g according to the mass ratio of the ingredients into the beater, beating dispersion;

(2) uniformly arranging the slurry of 0.5 ‰ concentration through the conveying equipment on the filter net of the single-mesh forming machine, and then performing forced vacuum dewatering and setting to obtain a wet continuous glass fiber chopped strand mat;

(3) conveying the wet continuous glass fiber chopped strand mat to an oven of 50-180 ° C for drying, and conveying to a cutting area for cutting to obtain a sheet core material meeting the size requirement;

Wherein the shaped core material mentioned in the step (3) has a thickness of 0.3 mm;

Example 4

(1) The glass fiber chopped strand mat of Example 1 was placed in a heat treatment furnace and heated, the maximum temperature was 170 ° C;

(2) After the temperature rises to the set value of 170 ° C and then kept for 60 min, the heat treatment furnace is opened to take out the glass fiber chopped strand mat;

(5) Open the vacuum sealer and take out the vacuum insulation board.

Comparison 1:

项目 project	本实施例真空绝热板 Vacuum insulation board of the embodiment	超细玻璃纤维（棉）毡芯材真空绝热板 Ultra-fine glass fiber (cotton) felt core vacuum insulation board
导热系数（ mW/m.k ） Thermal conductivity (mW/m.k)	2.0 2.0	3.5 3.5
成本降低（ % ） Reduce costs( % )	25 25	--- ---

Comparison 2:

项目 project	本实施例真空绝热板 Vacuum insulation board of the embodiment	传统玻璃纤维原丝毡芯材真空绝热板 Traditional glass fiber strand felt core vacuum insulation board
导热系数（ mW/m.k ） Thermal conductivity (mW/m.k)	2.2 2.2	4.3 4.3
成本降低（ % ） Reduce costs( % )	25 25	--- ---

Industrial applicability

The glass fiber chopped strand mat of the invention is used for the core material of the vacuum insulation board, and under the premise of adopting the same production mode, the production cost of the core material is obviously reduced, and the thermal conductivity of the vacuum insulation board thus obtained is lowered. 25% to 65%.

Claims

The invention discloses a glass fiber chopped strand mat, which comprises a glass fiber having a length of 4 to 25 mm and a fiber diameter of 5 to 15 μm, which is prepared by adding a thickener, a dispersing agent and a defoaming agent, and is prepared by dehydration and drying.
A glass chopped strand mat according to claim 1 wherein said glass fibers are corner scraps of a glass fiber producer.
A glass chopped strand mat according to claim 1, characterized by a core material for a vacuum insulation panel.
A glass chopped strand mat according to claim 3, wherein the core material of the vacuum insulation panel is composed of a core material prepared according to claim 3, a getter or adsorbent, and a closed high barrier packaging bag. The core material is made of a laminate of a plurality of sheet-like glass fiber chopped strand mats.
The invention relates to a method for preparing a glass fiber chopped strand mat, which is characterized in that it is prepared by forced vacuum dewatering by using a papermaking process in a papermaking process, and comprises the following steps:

(1) a glass fiber chopped strand having a preferred length of 4 to 25 mm and a fiber diameter of 5 to 15 μm, a thickener, a dispersing agent, and an antifoaming agent, which are dosed into a beater for beating and dispersing;

(2) uniformly arranging the slurry through a conveying device on a filter net of a single-mesh forming machine, and then performing forced vacuum dewatering and setting to obtain a wet continuous glass fiber chopped strand mat;

(3) The wet continuous glass fiber chopped strand mat is conveyed to an oven at 100-250 ° C for drying.
A method of preparing a glass chopped strand mat according to claim 5, wherein the core material formed by the step (3) has a thickness of 0.1 to 2.0 mm.