WO2017088532A1

WO2017088532A1 - Core material used for vacuum heat-insulation plate, and vacuum heat-insulation plate

Info

Publication number: WO2017088532A1
Application number: PCT/CN2016/095795
Authority: WO
Inventors: 王振安; 吴志煌; 罗宇彦
Original assignee: 福建赛特新材股份有限公司
Priority date: 2015-11-23
Filing date: 2016-08-18
Publication date: 2017-06-01
Also published as: CN106015838A

Abstract

A core material used for a vacuum heat-insulation plate is formed by laminating multiple non-woven fabrics. The non-woven fabrics comprise glass fibers and low-melting-point organic fibers, and can be produced and manufactured by using a dry non-woven process. In the non-woven fabrics, most of the glass fibers extend in the direction basically parallel to the surfaces of the non-woven fabrics. The core material used for a vacuum heat-insulation plate has excellent heat insulation performance, a simple production process and low cost.

Description

Core material and vacuum insulation board used in vacuum insulation board

Technical field

The invention relates to a core material and a vacuum insulation board used in a vacuum insulation panel, in particular to a glass fiber core material without adding a binder.

Background technique

The vacuum insulation board is a high-efficiency new insulation insulation material combined with the vacuum insulation principle and the traditional insulation material. It is widely used in refrigerators, incubators, building walls, refrigerated containers, etc. It consists of membrane materials, core materials, getter materials and so on.

At present, the core material is mostly made of a material having a multi-void ratio, a pore connection, and a low thermal conductivity. Most of the core material production adopts the wet production process, that is, the glass fiber or glass wool, flame cotton, etc. are beaten, paper-made, dried, and cut to make the core material, but the energy consumption is high, the process is complicated, and the cost is high. .

The invention relates to a short glass fiber adopting an improved non-woven process technology to dryly produce a vacuum insulation plate core material, and solves the problem of the wet process production of the glass fiber core material.

Summary of the invention

The main technical problem to be solved by the present invention is to provide a core material for use in a vacuum insulation panel, which has excellent heat insulation performance, and has a simple production process and low cost.

In order to solve the above technical problems, the present invention provides a core material for use in a vacuum insulation panel, which is formed by laminating a plurality of nonwoven fabrics; the nonwoven fabric comprises glass fibers and low-melting organic fibers, which can be dry Non-woven process manufacturing.

In the nonwoven fabric, most of the glass fibers are in the nonwoven fabric The surfaces extend in substantially parallel directions.

In a preferred embodiment: the glass fibers have an average fiber diameter of from 7 to 15 μm and an average fiber length of from 10 to 50 mm.

In a preferred embodiment, the glass fiber is present in an amount of from 90% to 99%, and the low-melting organic fiber is present in an amount from 1% to 10%.

The low melting point organic fiber has a melting point in the range of 80 to 200 °C.

In a preferred embodiment, no adhesive is added between the plurality of nonwoven fabrics.

The invention also provides a vacuum insulation board, comprising:

Outsourced materials;

a core material housed inside the outer covering material;

The interior of the outer covering material can be maintained in a reduced pressure state, and the core material includes the core material used in the vacuum insulation panel of claim 1.

In a preferred embodiment, the core material used in the vacuum insulation panel has an average fiber diameter of 7-15 μm and an average fiber length of 10-50 mm.

In a preferred embodiment, the vacuum insulation panel uses a core material having a glass fiber content of 90-99% and a low melting point organic fiber content of 1%-10%.

In a preferred embodiment, no adhesive is disposed between the plurality of nonwoven fabrics in the core material used in the vacuum insulation panel.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The core material used in the vacuum insulation panel of the present invention is composed of a plurality of non-woven fabrics; the material of the non-woven fabric is manufactured by using a dry non-woven process for a plurality of glass fibers and low-melting organic fibers; Due to the use of the dry non-woven process, the glass fibers are substantially completely single-fibrillated, and then air-laid to form a very thin nonwoven fabric, and the single-layer gram weight can be about 30-100 g/m ² . Since the glass fiber is stretched during the mechanical carding process, the glass fiber is straight, the glass fiber is not bent, the glass fiber is evenly distributed in the horizontal plane, and there is no vertical nonwoven fabric plane through the glass fiber, so the laminated multiple non-woven fabrics There are many layers of cloth, and there is only a small amount of point contact between glass fiber and glass fiber. In addition, the non-woven fabric and the non-woven fabric layer are bonded by the melted organic fiber, so the point contact between the glass fibers and the void formed by the lamination of the non-woven fabric are not filled with the adhesive, which reduces the heat conduction area and the thermal insulation performance. Got a big boost.

DRAWINGS

1 is a production flow diagram of a preferred embodiment of the present invention.

detailed description

The invention is further illustrated by the accompanying drawings and specific embodiments.

Example 1

Referring to Figure 1, the present embodiment uses a dry non-woven process technology to produce a core material for a vacuum insulation panel, using glass fibers and a small amount of low-melting organic fibers, by opening, mixing, combing, air-laid, and gripping. Net machine, heat setting machine, hot roll, vertical and horizontal cutting machine and other equipment to produce the core material used in vacuum insulation board.

The specific production steps are as follows:

1 Raw material ratio: 90-99% of alkali-free glass fiber, the average fiber diameter of glass fiber is 7-15μm, the average fiber length is 10-50mm, and the low-melting polyester fiber is 1-10%.

2 process flow:

1) The glass fiber and the low-melting polyester fiber are dispersed and loosened by a two-way opening machine, and a part of the glass short fiber is monofilamentized.

2) The glass fiber and the low-melting polyester fiber which have passed through two opening machines are carded by a carding machine to further monofilamentize the glass fiber and the low-melting polyester fiber, and the glass fiber is straightened, and the impurities and the cleaning electrode are cleaned. Fine fibers, because of the extremely thin glass fibers that are easily filled in the gap space between the fibers of the formed core fibers, affect the thermal insulation properties.

Glass fiber and other organic fiber properties have the following different characteristics:

(1) The relative density of the glass fiber is about twice that of the synthetic chemical fiber;

(2) The glass fiber has a round bar shape, the surface is smooth, no curling, and the cohesion of the fiber and the fiber is small;

(3) Glass fiber brittle material, not resistant to folding, not wearable.

Therefore, in the selection of the carding machine, it is necessary to comprehensively screen and improve from the carding machine and the carding machine:

(1) Improve the feeding device, and the designed feeding device ensures that the glass fiber can enter the carding machine uniformly and smoothly;

(2) For the characteristics of glass fiber, choose a suitable card clothing, analogous to the use of horizontal stripes, increase the grip of the card fiber to increase the friction;

(3) Adjusting the gauge spacing of the card clothing to improve the carding effect;

(4) Control the speed of the licker, cylinder and transfer roller to reduce the damage to the fiber and improve the combing ability;

(5) The fiber entering the carding machine has some impurities, the fiberglass ratio is large, and it is smooth and has no cohesion. Therefore, a large amount of glass fiber short wire falls into the belly of the machine, causing waste, which requires adjusting the position of the dust removing knife and installing The angle and the distance from the licker roll minimize the amount of fiberglass that falls into the belly of the machine;

(6) Due to the brittleness of the glass fiber, the size of the gauge should be adjusted to avoid excessive combing damage to the glass fiber, and breakage, resulting in a large amount of glass fiber pulverization.

3) The glass fiber and the low-melting polyester fiber after the two opening machines and the carding machine are dropped on the perforated mesh curtain to form a non-woven fabric under the action of the working roller and the negative pressure of the air-laid machine.

Because glass fiber and low-melting polyester fiber should be rubbed with the moving machinery in the spinning equipment such as opening, carding, air-laid, etc., it is easy to accumulate electric charge on the surface of the fiber, so that the fiber and the fiber are repelled, and the fiber and the machine are The fibers are attracted to each other such that the glass fibers and the low-melting polyester fibers are agglomerated at the cylinders of the carding machine, the cages or corners of the air-laid machine. Therefore, the glass fiber and the low-melting-point polyester fiber are poorly combed, and the air-laid nonwoven fabric is poor in uniformity. In order to overcome the effects of static electricity, the following means are needed:

(1) Install anti-static devices on the opener, carding machine and air-laid machine. We use ion wind bar and ion wind nozzle:

The ion wind bar and the ion tuyere can generate a large number of air masses with positive and negative charges, which are blown out by the compressed gas at high speed, and can neutralize the electric charge on the object. When the static electricity on the surface of the object is negative, it attracts. The positive charge in the airflow, when the surface of the object is electrostatically positively charged, it will attract the negative charge in the airflow, so that the static electricity on the surface of the object is neutralized, so as to eliminate the static electricity on the surface of the fiber;

(2) spraying an antistatic agent on the glass fiber and the low melting point polyester fiber before opening;

(3) Glass fiber is added with antistatic agent in the production sizing agent;

(4) Humidifier is used in the production workshop to maintain the humidity of the production workshop at 60-75%.

4) The air-laid glass fiber and a small amount of low-melting organic synthetic fiber mixed non-woven fabric have a weight of 50-100g/m ² , and the non-woven fabric is laminated by a clamp cross-lapper to make a weight of 500-5000g. a glass fiber laminate of /m ² .

If it is necessary to make a 10 mm thick vacuum insulation panel, the glass fiber laminate core material has a basis weight of about 2500 g/m ² , and the cross-lapper is used to laminate 32 to 50 layers of the nonwoven fabric. If it is necessary to fabricate vacuum insulation panels of other thicknesses, adjust the number of layers of the nonwoven fabric laminate as needed.

5) Clamp the cross-lapper to make the glass fiber laminate into the hot press setting machine. The double-layer hot press setting machine consists of three sections: two sections with natural gas heating device, length 6 meters, control temperature is 200-250 °C Between the section and a section of the cooling zone with a chiller, 3 meters long. The heating temperature control is for the low melting point organic fiber to melt and bond the glass fiber to form a core material with better strength.

6) The glass fiber laminate from the hot press setting machine enters a pair of hot roll rolls, and the hot roll is heated by the heating oil to 200-250 ° C to compact the surface of the glass fiber laminate, and the surface is smooth and flat.

7) The glass fiber laminate which has passed through the hot roll has a density of 40-120 kg/m ³ , enters slitting, and is cross-cut to obtain a desired core material size.

After the above steps, the core material used in the vacuum insulation panel can be made by laminating a plurality of non-woven fabrics; the non-woven fabric is produced by a dry non-woven process using a plurality of glass fibers and low-melting organic fibers. Manufacture

In the nonwoven fabric, a majority of the plurality of glass fibers are oriented so as to extend in a direction substantially parallel to a surface of the nonwoven fabric.

And the glass fibers have an average fiber diameter of 7 to 15 μm and an average fiber length of 10 to 50 mm.

The content of the glass fiber is 90-99%, and the content of the low melting point organic fiber is 1%-10%.

Since the dry non-woven process is used, the glass fiber is substantially completely single-fibrillated, and then the air-laid nonwoven fabric is thin, and the basis weight can be about 30-100 g/m ² . Since the glass fiber is stretched in the carding machine, the glass fiber is straight, the glass fiber is not bent, the glass fiber is evenly distributed in the horizontal plane, and there is no through-glass fiber in the plane of the vertical nonwoven fabric, so the layer of the plurality of laminated nonwoven fabrics is laminated. A lot, glass fiber and fiberglass have only a few point contacts. In addition, the non-woven fabric and the non-woven fabric are bonded by the melted organic fiber, and the special combing and airflow machine have less damage to the glass fiber, less short fibers and easy meshing, so the glass fiber contact and the non-woven fabric are laminated. The voids are filled with binder and other broken short staple fibers, reducing the heat transfer area and greatly improving the thermal insulation properties.

The above-mentioned core material used for the vacuum insulation panel has a thermal conductivity of 1.0 to 1.8 mW/m·k. And because the two opening and improved carding machines make the glass fiber substantially completely single-fibrillated, the air-laid felt has a thin basis weight of about 50-80 g/m ² , because the fiber is stretched in the carding machine, the fiber Very straight, the fiber is not bent, there is no vertical felt plane through the fiber, the number of layers is many, the special combing and airflow machine has less damage to the glass fiber, less short fibers, only a few point contact between the fiber and the fiber, fiber contact The gap formed by the lamination is filled with no binder and other broken short fibers, which reduces the heat conduction area, and the thermal insulation performance is better than that of the non-woven fabric produced by the wet method, and has a simple process, low production cost, and energy saving. Advantages such as wastewater discharge.

Example 2

A vacuum insulation board comprising:

Outsourced materials;

a core material housed in the outer covering material;

The interior of the outer covering material can be maintained in a reduced pressure state (ie, a vacuum negative pressure state), and the core material includes the core material used in the vacuum insulation panel described in Embodiment 1.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Industrial applicability

The fibers of the insulating core material of the present invention have only a few point contacts between the fibers and the fibers, and the voids formed by the fiber contact and lamination are not filled with the binder and other broken fine short fibers, which reduces the heat conduction area, and the thermal insulation performance is compared with the wet method. The non-woven fabric produced is better.

Claims

A core material used in a vacuum insulation panel, characterized in that: a plurality of nonwoven fabrics are laminated; the nonwoven fabric comprises glass fibers and low-melting organic fibers, and the content of the glass fibers is 90-99%. The content of the low melting organic fiber is from 1% to 10%;

In the nonwoven fabric, most of the glass fibers extend in a direction substantially parallel to the surface of the nonwoven fabric.
A core material for use in a vacuum insulation panel according to claim 1, wherein said glass fibers have an average fiber diameter of 7 to 15 μm and an average fiber length of 10 to 50 mm.
A core material for use in a vacuum insulation panel according to claim 1, wherein no adhesive is added between the plurality of nonwoven fabrics.
A core material for use in a vacuum insulation panel according to any one of claims 1 to 3, characterized in that the nonwoven fabric is produced by a dry nonwoven process.
The core material used in a vacuum insulation panel according to claim 1, wherein the core material in which the plurality of nonwoven fabrics are laminated has a plate shape.
A core material for use in a vacuum insulation panel according to claim 1, wherein said low melting point organic fiber has a melting point in the range of 80 to 200 °C.
A vacuum insulation panel characterized by comprising:

Outsourced materials;

a core material housed inside the outer covering material;

The interior of the outer covering material can be maintained in a reduced pressure state, and the core material is a core material used in the vacuum insulation panel of claim 1.
A vacuum insulation panel according to claim 7, wherein the core material used in the vacuum insulation panel has an average fiber diameter of 7-15 μm and an average fiber length of 10-50mm.
A vacuum insulation panel according to claim 7, wherein said nonwoven fabric is produced by a dry nonwoven process.
A vacuum insulation panel according to claim 7, wherein said low melting point organic fiber has a melting point in the range of 80 to 200 °C.
A vacuum insulation panel according to claim 7, wherein no adhesive is added between the plurality of nonwoven fabrics in the core material used in the vacuum insulation panel.