CN203336147U - Vacuum heat insulation panel core material and vacuum heat insulation panel - Google Patents

Abstract

The utility model relates to a core material of a vacuum heat insulation board which can be packaged by an aluminum-plated film, is not easy to fall off, is easy to form, and can prevent fibers from piercing the aluminum-plated film and a manufacturing method thereof. The core material of the vacuum insulation panel includes multi-layer laminated glass fiber sheet (namely chopped strand core material) formed by wet papermaking method, or glass fiber mat formed by dry-laid non-woven process (namely dry-laid glass fiber mat). Fiber cotton core material), or an intermediate core material composed of a laminate of glass fiber sheet and glass fiber felt (that is, a mixed core material); there are ultra-fine glass fiber cotton sheets on the upper and lower sides of the intermediate core material; The diameter of the fiber in the superfine glass fiber cotton sheet is 1-4um and the length is 1-5mm. Ultra-fine glass fiber cotton core material is suitable for production with aluminized film and aluminum foil composite film because the fiber itself is small in diameter, short in length, and soft in fiber, and is not easy to pierce the film bag; this avoids the need for chopped strand core material or dry method The glass fiber felt core material is in contact with the film bag in a large area, which effectively avoids the risk of the fiber piercing the film bag.

Description

A core material of a vacuum insulation panel and a vacuum insulation panel

technical field

The utility model relates to a core material of a vacuum heat insulation panel and a vacuum heat insulation panel using the core material, in particular to a core material of chopped strands (a laminate of chopped strand sheets formed by a wet method), or a core material formed in a dry state. Fiberglass mat core material, or the vacuum insulation panel core material with ultra-fine glass fiber cotton sheets on the upper and lower sides of the core material containing wet-formed chopped strands and dry-process glass fiber mat, which is suitable for It is used in home appliance insulation, cold chain logistics, building insulation and other fields.

Background technique

At present, the core material of vacuum insulation panels generally chooses porous media materials, such as powdered silica, aerogel, glass fiber or microporous polyurethane, and each material has its advantages and disadvantages. Secondly, when each core board is used, desiccant or getter must be added to remove the unremoved gas and moisture in the barrier film and the core material to ensure the vacuum degree, thereby improving the service life of the vacuum insulation board. Vacuum insulation panels have been used in various fields, and they meet customer requirements with the characteristics of energy saving, low carbon, environmental protection and safety. Through investigation and actual operation, it can be seen that the selection and production method of the core material inside the vacuum insulation panel has a great influence on its various properties. The core material is generally made of porous media materials, such as airgel, foamed polyurethane, silica powder, asbestos fiber, glass fiber, etc. For the core material of the vacuum insulation panel, it must have the following four characteristics: 1. It can support the interior of the vacuum insulation panel under high vacuum negative pressure to prevent the vacuum insulation panel from shrinking and sinking; 2. Minimize the heat conduction takes place. 3. It must have an open-pore structure so that the gas can be discharged at the fastest speed under negative pressure; 4. The material must have no gas release or as little release of gas as possible in a vacuum or ultra-low vacuum state.

At present, due to the different application fields of vacuum insulation panels, the selection of core materials is also different. Good heat resistance and low thermal conductivity are required for home appliance insulation and building insulation. At present, most thermal insulation materials have high thermal conductivity, large volume, and the thickness is generally between 1cm-5cm. After being used for household appliance insulation, cold chain logistics, and building insulation, the available space for household appliances and buildings is reduced and the insulation life is short. Vacuum insulation panels are just in line with the insulation needs of various fields, and it is hoped that the thickness of the insulation panel will be thinner and the thermal conductivity will be reduced.

Chinese Patent No.: ZL200880122390.2 discloses a core material for vacuum insulation materials, that is, a chopped strand core material, which uses glass fibers with a diameter of 6-13um and a length of 4-20mm; A nonwoven fabric comprising at least a plurality of glass fibers produced by a continuous fiber production process. In the nonwoven fabric, most of the glass fibers among the plurality of glass fibers extend in a direction substantially parallel to the surface of the nonwoven fabric.

The deficiencies of the above-mentioned prior art are: the fiber diameter is thicker, the length is longer (6-13um in diameter, 4-20mm in length), and the fiber is relatively hard; (VIP), in the actual production or use process, the fiber is easy to pierce the aluminized film; therefore, when producing VIP, the outsourcing sealing film generally does not use aluminized film; currently, aluminum foil composite film is used to produce VIP, To overcome the above problems; and this brings new problems, because the aluminum foil composite film contains pure aluminum layer (AL) and aluminum layer (VMPET), and the aluminum layer is relatively thick (generally about 7um), resulting in VIP in In the actual application process, there will be a relatively serious thermal bridge effect, which will inevitably lead to an increase in the overall thermal conductivity of VIP, thereby affecting energy saving effects and product quality.

The pure aluminum layer in the aluminum foil composite film is an extremely thin sheet formed by high-purity aluminum after repeated calendering. It is an excellent heat conductor, and the purity of the aluminum foil for packaging is above 99.5%.

The aluminized film contains an aluminized layer (VMPET) instead of a pure aluminum layer (AL). Therefore, the thermal conductivity of the aluminized film is much lower than that of the aluminum foil composite film.

Therefore, how to prevent the fibers from piercing the aluminum-coated film while using the aluminum-coated film for VIP packaging is a technical problem to be solved in this field.

Utility model content

The technical problem to be solved by the utility model is to provide a core material of a vacuum insulation panel that can be packaged with an aluminized film and can prevent fibers from piercing the aluminized film.

In order to solve the above technical problems, the utility model provides a vacuum insulation panel core material, which includes: a glass fiber sheet (that is, a chopped strand core material) formed by a wet papermaking method laminated by multiple layers, or a dry process Glass fiber mat formed by non-woven fabric technology (i.e. dry glass fiber cotton core material), or the intermediate core material composed of glass fiber sheet and glass fiber mat lamination (i.e. mixed core material); in the intermediate core material The upper and lower sides are covered with ultra-fine glass fiber cotton sheets; the fiber diameter in the ultra-fine glass fiber cotton sheets is 1-4um and the length is 1-5mm.

The ultra-fine glass fiber cotton sheet is formed by wet papermaking method or dry non-woven fabric process.

The glass fiber constituting the glass fiber mat has a diameter of 4-20um and a length of 4-15mm.

As a preference, the glass fiber sheet is formed by glass fiber chopped strands with a diameter of 6-13um and a length of 4-20mm produced by wire drawing.

The glass fibers in the glass fiber sheet and the glass fiber mat are distributed in layers, most of them are parallel to the top surface, and the glass fibers in the same plane are randomly distributed, and the thickness of the sheet is uniform to facilitate vacuuming.

As another optional embodiment, the glass fiber sheet includes: 70-100wt% glass fiber chopped strands with a diameter of 6-13um and a length of 4-20mm produced by wire drawing and 0-30wt%, Glass fiber wool produced by flame method with a diameter of 1.0-4um and a length of 1-5mm; glass fiber wool produced by a flame method has a thin diameter and a short length, so the correspondingly obtained glass fiber wool has a relatively high density and the resulting vacuum The thermal conductivity of the core material of the insulation panel is low, but if the glass fiber wool produced by the flame method is used alone to produce the core material of the vacuum insulation panel, the manufacturing cost will be high, and the thermal conductivity of the vacuum insulation panel made is difficult to reach 0.0025W/ Below m.k, the quality is unstable and the controllability is poor; in the utility model, glass fiber chopped strands produced by 70-100wt% wire drawing method and glass fiber wool produced by 0-30wt% flame method are used as the raw material of vacuum insulation board core material, glass The proportion of fiber cotton is small, which greatly reduces the production cost and improves the stability of product quality compared with the existing technology; the thermal conductivity of the core material of the vacuum insulation panel produced is below 0.030W/m.k, and the thermal conductivity of the insulation panel Compared with the glass fiber cotton core material produced by 100wt% flame method, the coefficient is lower, and the heat preservation effect is better; the thickness of the single core material is controlled at 0.5-5mm (under 10kpa pressure), and the density is controlled at 80kg/m3-200kg/m3, The compression ratio is slightly larger than the superfine glass fiber cotton core material produced by 100wt% flame method, but it will not have a great impact on the production process.

As another optional embodiment, between two adjacent layers of glass fiber sheets, or between adjacent glass fiber sheets and glass fiber mats, a 1-15mm thick layer of silica powder is provided or a The board formed by pressing silica powder; the mixed use of silica layer or board and glass fiber is beneficial to further improve the heat insulation effect and comprehensive performance of the core material of the vacuum insulation board.

As a further preference, most of the glass fibers in the glass fiber mat are distributed parallel to the top surface of the glass fiber mat to facilitate vacuuming.

The method for making the core material of the vacuum insulation panel includes the following steps:

(1) Take glass fiber chopped strands produced by wire drawing method with a diameter of 6-13um and a length of 4-20mm; or, take 70-100wt% glass produced by a wire drawing method with a diameter of 6-13um and a length of 4-20mm Fiber chopped strands are mixed with 0-30wt% glass fiber wool with a diameter of 1.0-4um and a length of 1-5mm produced by flame method;

(2) Disperse the above-mentioned glass fiber, then add water and stir, and after stirring evenly, send it to the mixing tank and add water to dilute, and the diluted concentration is 0.3-1.0wt%;

(3) Send the diluted slurry into the head box, and the slurry flowing out of the head box flows into a forming net in layers, and negative pressure suction ports are evenly distributed under the forming net for dehydration; the dehydrated fibers are deposited on the The forming net is uniform in thickness, distributed in layers, and parallel to the top surface to form a sheet of required thickness, that is, to obtain a wet board;

(4) Roll the above-mentioned wet board with a pressing roller to make its surface smooth and uniform in thickness;

(5) The wet plate that has completed the above step (4) is dehydrated and dried to form a glass fiber sheet;

(6) Take ultra-fine glass fiber cotton with a diameter of 1-4um and a length of 1-5mm, and repeat the above steps (2)-(4) to obtain a wet board, which is dehydrated and dried to form a super Fine glass fiber cotton sheet;

(7) Lay multiple layers of the above-mentioned glass fiber sheets to form an intermediate core material; lay ultra-fine glass fiber cotton sheets on the upper and lower sides of the intermediate core material and then cut them to make the required core material.

The glass fiber core material produced by the above method has technical effects: it is beneficial to vacuumize the vacuum insulation panel to reduce the thermal conductivity of the vacuum insulation panel, and can make the thermal conductivity of the vacuum insulation panel <0.0025W/m.k. The core material of the vacuum insulation panel of the utility model has simple molding process, low cost and stable and controllable quality.

As a preference, under the pressure condition of 10KPa, the thickness of the glass fiber sheet produced in the step (5) is 0.5-5mm, and the thickness of the ultrafine glass fiber cotton sheet in the step (5) is 0.2 -2mm. Since the diameter of the glass fiber chopped strands used in making the core board is 6-13um, the length is the glass fiber chopped strands produced by the drawing method of 4-20mm, so under the pressure condition of 10KPa, the optimal thickness of the glass fiber sheet blank is 0.5-5mm.

As a preference, when the forming wire dehydrates the glass fiber layer in the step (3), the speed of the forming wire is 12-30 m/min. Adopting this speed can effectively ensure that the density of the wet board produced by the forming screen is uniform, the arrangement is neat, and the overall thickness is relatively uniform, which improves the quality of the finished product of the core material of the vacuum insulation board.

As a preference, in the dilution process of the step (2), 0.005-0.015% of hydroxycellulose based on the total weight of the glass fiber chopped strands is added to reduce the electrostatic effect.

As a kind of preference, in order to produce the glass fiber sheet of above-mentioned structure, the top surface of described forming net is inclined to be arranged; Above forming net is provided with the diversion channel that links to each other with described headbox, the bottom plate of this diversion channel is connected with the The top surface of the forming net is parallel, and the bottom plate of the diversion channel is evenly distributed with slit nozzles perpendicular to the length direction of the forming net; the negative pressure suction ports are respectively arranged opposite to the slit nozzle and distributed on The downstream side of each slit nozzle is to facilitate the uniform distribution of the fibers in the slurry on the top surface of the forming net, and make the fiber layers distributed in the same plane, most of which are parallel to the surface of the glass fiber sheet.

As a preferred solution, the forming net is of a conveyor belt type to facilitate continuous production.

As a further preferred solution, the conveying direction of the top surface of the forming net is from bottom to top, which facilitates the deposition of fibers on the forming net with uniform thickness, layers distributed in the same plane, and mostly parallel.

A vacuum insulation panel, comprising the above-mentioned core material of the vacuum insulation panel, and an aluminized film or an aluminum foil composite film coated on the core material of the vacuum insulation panel for vacuuming, or an aluminum-coated film or an aluminum foil A bag made of composite film.

Technical effect of the present utility model:

1. In the utility model, the upper and lower layers of the chopped strand or dry-process glass mat core material are covered with ultra-fine glass fiber cotton core material, which constitutes a composite core material. The technical effect obtained is: ultra-fine glass fiber cotton core material Because the fiber itself is small in diameter, short in length, and soft in fiber, it is not easy to puncture the film bag (that is, it avoids the glass fiber with a diameter of 6-13um and a length of 4-20mm in the prior art that is easy to puncture the aluminized film bag situation), so it is suitable to produce VIP with aluminized film; this avoids the large area of chopped strand core material or dry glass fiber mat core material in contact with the film bag, effectively avoiding the risk of fibers piercing the film bag; of course, Aluminum foil composite film can be used to produce VIP according to needs;

2. The composite core material can be used to produce VIP with various types of membrane materials; through the matching scheme of this composite core material, it breaks through the limitation that the thick diameter core material can only be produced by using aluminum foil composite membranes, and the composite core material can be used with membranes arbitrarily materials to produce VIP boards actually needed;

3. The chopped strand core material and the dry-process fiberglass mat core material in the prior art are relatively fluffy. In order to improve the performance of the chopped strand and dry-process glass fiber mat core materials, the binder will be reduced as much as possible during the production process. Therefore, in the production process of chopped strand core material and dry glass fiber felt core material, it is easy to cause the core board to be damaged, the chopped strands fall off, it is not easy to bag, and the surface of the finished product is uneven. Layer wrapping can effectively solve these problems.

Description of drawings

Fig. 1 is a structural schematic diagram of a production device for a vacuum insulation panel core material;

Fig. 2 is a schematic cross-sectional structure diagram of a core material of a vacuum insulation panel, which is formed by alternate lamination of multiple layers of glass fiber sheets formed by wet papermaking and glass fiber mats formed by dry-laid non-woven fabrics;

Figure 3 is another schematic cross-sectional structure diagram of the core material of the vacuum insulation panel, which is composed of multi-layer glass fiber sheet formed by wet papermaking method, glass fiber mat and silica powder layer formed by dry non-woven fabric process or Plates formed by pressing silica powder are alternately stacked.

Detailed ways

Below in conjunction with specific examples, the utility model is described in further detail.

Example 1

As shown in Figure 2, the vacuum insulation panel core material of this example includes an intermediate core material composed of 10 to 30 laminated glass fiber sheets 8 formed by a wet papermaking method (that is, a chopped strand core material); The upper and lower sides of the upper and lower sides are completely covered with at least one layer of ultra-fine glass fiber cotton sheet 9; the fiber diameter in the ultra-fine glass fiber cotton sheet 9 is 1-4um, and the length is 1-5mm, which is made of the core material The thermal conductivity of the vacuum insulation panel is ≤0.0025W/m.k.

As a variable embodiment, the intermediate core material is arranged in a bag made of the above-mentioned ultra-fine glass fiber cotton sheet, or the above-mentioned ultra-fine glass fiber cotton sheet 9 wraps the surrounding edges of the intermediate core material To avoid direct contact between the edge of the glass fiber sheet 8 and the aluminized film or aluminum foil composite film.

The glass fiber sheet is formed by a wet papermaking method from glass fiber chopped strands produced by a drawing method with a diameter of 6-13um and a length of 4-20mm.

The above-mentioned manufacturing method of the core material of the vacuum insulation panel, the specific steps of the manufacturing method are as follows:

(A) Take glass fiber chopped strands produced by drawing method with a diameter of 6-13um and a length of 4-20mm;

(B) Disperse the above-mentioned glass fibers, then add water and stir them, and then send them to the mixing pool to dilute with water to a concentration of 0.8wt%, and add 0.012% of the total weight of the above two kinds of glass fibers to reduce the electrostatic effect;

(C) Send the diluted glass fiber slurry into the storage tank;

(D) Send the slurry in the stock tank into the head box 2, and the slurry 3 flowing out of the head box 2 flows through the multi-layer nozzle 4 to the forming wire 1 in layers. The corresponding fan suction port (that is, the negative pressure suction port 5) and perform layered vacuum dehydration. The fibers after dehydration are deposited on the forming wire 1 to form uniform and orderly sheets, that is, to make a glass fiber chopped strand wet board; when the forming wire 1 dehydrates the glass fiber slurry in this step, the speed of the forming wire 1 is 20-25m/min;

(E) Use roller 6 to horizontally roll the glass fiber wet plate to make the surface smooth, and at the same time adjust the thickness of the glass fiber wet plate to adjust the thickness of the glass fiber wet plate to 1.5mm;

(F) Transfer the shaped glass fiber wet board to the vacuum negative pressure conveyor belt to remove 60% of the water in the glass fiber wet board, so that the water content of the glass fiber wet board is controlled below 40%;

(G) Then send the moisture-removed glass fiber wet plate into the oven 8 for drying and curing. The temperature in the oven 8 is controlled at 280 degrees Celsius, and the baking time is 15 minutes; after the baking is completed, the glass fiber core sheet is formed ;

(H) Take ultra-fine glass fiber cotton with a diameter of 1-4um and a length of 1-5mm, and repeat the above steps (B)-(F) to obtain a wet plate, and send the wet plate to the oven 8 for drying Dry curing, the temperature in the baking oven 8 is controlled at 280 degrees Celsius, and the baking time is 15 minutes; after the baking is completed, an ultra-fine glass fiber cotton sheet is formed;

(1) According to the production requirements, the multi-layer glass fiber sheets are laminated to form an intermediate core material; the upper and lower sides of the intermediate core material are laid with ultra-fine glass fiber cotton sheets, and then cut into 600mm × 600mm, That is, the finished product of the core material of the vacuum insulation panel is obtained.

Fig. 1, the top surface of the forming net 1 is inclined; the top of the forming net 1 is provided with a diversion channel 7 connected to the headbox 2, and the bottom plate of the diversion channel 7 is connected to the top surface of the forming net 1 Parallel, a plurality of slit nozzles 4 perpendicular to the length direction of the forming net 1 are evenly distributed on the bottom plate of the diversion channel 7; The downstream side of each slit nozzle 4 is beneficial to uniformly distribute the fibers in the slurry on the top surface of the forming wire. The width of the slit nozzle 4 is 1-8 mm.

The forming net 1 is of conveyor belt type to facilitate continuous production; the conveying direction of the top surface of the forming net 1 is from bottom to top, which is conducive to the deposition of fibers on the forming net with uniform thickness and layered distribution. parallel to the top surface of the wood.

As an optional solution, in the step (I), between two adjacent layers of glass fiber sheets 8, or between adjacent glass fiber sheets 8 and ultrafine glass fiber cotton sheets 9, A 10 mm thick layer of silica powder or a board 10 formed by pressing silica powder.

Example 2

The intermediate core material of the vacuum insulation panel core material in this example is made of a multi-layer glass fiber sheet formed by wet papermaking after uniformly mixing glass fiber chopped strands and glass fiber cotton, and at least one layer is made of dry-laid non-woven fabric. The formed single-layer glass fiber mats are alternately laminated, and then the superfine glass fiber cotton sheets are laid on the upper and lower sides of the middle core material. The thermal conductivity of the vacuum insulation panel made of the core material is ≤0.0025W/m.k.

Example 3

The intermediate core material of the vacuum insulation panel core material in this example is made of a glass fiber mat formed by a dry-laid non-woven fabric process, and then the ultra-fine glass fiber cotton sheet is laid on the upper and lower sides of the intermediate core material. The thermal conductivity of the vacuum insulation panel made of core material is ≤0.0030W/m.k.

The above-mentioned glass fiber mat adopts the centrifugal blowing method (abbreviated as centrifugal method) to produce glass microfibers; the production process of centrifugal glass microfibers includes: raw material system, melting system, fiber forming system, combustion gas mixing supply system, etc. The raw materials are mixed according to the ratio and sent to the glass melting furnace. The molten glass flows out through the drain plate at the end of the material channel and enters the centrifuge. Driven by the high-speed rotating centrifuge, nearly 10,000 thin streams of glass thrown off the side wall of the centrifuge are further drawn and cut into fibers of a certain length under the high-temperature and high-speed flame generated by the combustion chamber. This process first throws out the initial thin glass stream from the holes on the wall of the centrifugal head, and then stretches the thin glass stream a second time by the high-temperature and high-speed flame generated by the combustion chamber.

Example 4

A vacuum insulation panel, comprising the core material of the vacuum insulation panel described in any one of the above-mentioned embodiments 1-3, and an aluminized film or an aluminum foil composite coated on the core material of the vacuum insulation panel for vacuuming film, or a vacuum bag made of the above-mentioned aluminized film or aluminum foil composite film.

The aluminized film includes 2 to 5 layers of laminated, 12um thick polyester aluminized layer (VMPET), and a 50um thick linear low density polyethylene layer at the bottom of each polyester aluminized layer (VMPET) (LLDPE).

The aluminum foil composite film includes a nylon layer (15um), a polyester aluminized layer (12um), a pure aluminum layer (7um) and a linear low-density polyethylene (50um) layered up and down in sequence.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the utility model, rather than limiting the implementation manner of the utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or variations derived from the spirit of the present utility model are still within the protection scope of the present utility model.

Claims (4)

1. a core material of vacuum heat insulation plate, it is characterized in that comprising: by the glass fibre sheet of multilayer laminated employing wet type paper process moulding, or the glass fiber mat of employing dry method non-woven fabrics craft moulding, or the middle core of the lamination of glass fibre sheet and glass fiber mat formation; Be coated with the cotton sheet material of superfine glass fiber in the both sides up and down of this centre core;

Fiber diameter in the cotton sheet material of described superfine glass fiber is that 1-4um, length are 1-5mm.

2. core material of vacuum heat insulation plate as claimed in claim 1 is characterized in that: described glass fibre sheet comprises that diameter is that 6-13um, length are the glass chopped silk that the 4-20mm fiber elongation method is produced;

The diameter that forms the glass fibre of described glass fiber mat is that 4-20um, length are 4-15mm.

3. core material of vacuum heat insulation plate as claimed in claim 1, is characterized in that: between the adjacent two layers glass fibre sheet, or be provided with the silica bisque between adjacent glass fibre sheet and glass fiber mat or adopt the compressing plate of silicon dioxide powder.

4. a vacuum heat-insulating plate is characterized in that comprising: core material of vacuum heat insulation plate as described as one of claims 1 to 3, and be coated on aluminizer or the foil laminated film on this core material of vacuum heat insulation plate.

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