CN107639920A - A kind of compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity and preparation method thereof - Google Patents
A kind of compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to compound dry method hot pressing core material of vacuum heat insulation plate of a kind of low thermal conductivity and preparation method thereof, belong to glass-fibre technology field, the core is by mass percentage, cotton is rolled up by 70~80wt% ultra-fine fibre glasses dry method and 20~30wt% wet method core material of vacuum heat insulation plate hot pressing forms, the core realizes the seamless combination of ultra-fine fibre glass dry method volume cotton and wet method core material of vacuum heat insulation plate, its thermal conductivity factor is further reduced, and surface smoothness is higher.Methods described is included into fine, collection cotton, clot, paving cotton, hot pressing and cutting, ultra-fine fibre glass production it will be separated in the prior art with hot pressing, both are allow individually to carry out, solves the problems, such as hot pressing in the prior art and ultra-fine fibre glass production line both sides' speeds match, allow the production process of different performance ultra-fine fibre glass with the hot pressing process to coordinate to carry out, simultaneously, hot pressing mode is continuous hot-press in this method, it need not stop the dwell time, continuous production is realized, production efficiency is effectively improved and reduces production cost.
Description
Technical field
The invention belongs to glass-fibre technology field, and in particular to a kind of compound dry method hot pressing vacuum insulation of low thermal conductivity
Board core material and preparation method thereof.
Background technology
Vacuum heat-insulating plate has excellent heat-insulating property as a kind of novel heat insulation heat-barrier material.Vacuum heat-insulating plate be by
Core, membrane material and dry air-breathing auxiliary material three parts composition, core must as the framework material and maintenance vacuum of vacuum material
Standby condition, plays very important role.Air vent aperture inside core is smaller, and the convection current and conduction of gas are fewer, therefore
Vacuum insulation core material is thermally shielded using light porous material.Usual core material of vacuum heat insulation plate is all to be molded to make with wet processing
It is standby, but whole wet processing process is complicated, and production cost is high.Publication No. CN104370450A discloses a kind of super Rotating fields and surpassed
Thin centrifugal glass fibre dry method core preparation method, although this method is using dry process core material of vacuum heat insulation plate, the party
Centrifugal cotton production line is directly connected by method with hot-press equipment, and uses the forming method of static hot pressing in batches, and this method
Line speed matching problem in actual production be present, lead to not practical operation, and static hot pressing needs to grow in batches
The dwell time of time, low production efficiency is caused, yielded poorly, production cost is high.Therefore, how to prepare can continuous hot-press into
The compound dry method hot pressing core of low thermal conductivity of type is to prepare high-efficiency vacuum insulated panel core material urgent problem to be solved.
The content of the invention
In view of this, it is an object of the invention to：(1) a kind of compound dry method hot pressing vacuum heat-insulating plate of low thermal conductivity is provided
Core；(2) a kind of preparation method of the compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity is provided.
To reach above-mentioned purpose, the present invention provides following technical scheme：
1st, the compound dry method hot pressing core material of vacuum heat insulation plate of a kind of low thermal conductivity, by mass percentage, the vacuum is exhausted
Hot plate core cotton and 20~30wt% wet method core material of vacuum heat insulation plate hot pressing rolled up by 70~80wt% ultra-fine fibre glasses dry method and
Into.
Further, the normal distribution of diameter 93% of the ultra-fine fibre glass in the ultra-fine fibre glass dry method volume cotton exists
2.5~6 μm, the normal distribution of length 92% is in 25~50mm.
Further, by mass percentage, the ultra-fine fibre glass dry method volume cotton includes following component：SiO2：62.5
~72wt%, Na2O：5.5~10.5wt%, K2O：2~3.5wt%, Al2O3：2.5~6.5wt%, MgO：3~6wt%,
CaO：5~8wt%, B2O3：4~8.5wt%, Fe2O3：0.05~0.1wt%, ZnO：0.8~2.5wt%, BaO：0.5~
3.5wt%.
Further, the thickness of the wet method core material of vacuum heat insulation plate is 0.5~10mm, the uniformity≤5% of surface density/
m2, thermal conductivity factor is 28.5~32.1mW/MK.
Further, by mass percentage, the wet method core material of vacuum heat insulation plate includes following component：SiO2：63~
70wt%, Na2O+K2O：14.5~17.5wt%, Al2O3：2~4.5wt%, MgO：2~4wt%, CaO：5~8wt%, B2O3：
5~8wt%, Fe2O3：0.05~0.12wt%, ZnO：0.6~1.4wt%, BaO：0.8~1.2wt%.
2nd, the preparation method of the compound dry method hot pressing core material of vacuum heat insulation plate of described a kind of low thermal conductivity, including following step
Suddenly：
(1) into fibre：Cotton constituent is rolled up according to ultra-fine fibre glass dry method and chooses quartz sand, albite, potassium feldspar, boron
Sand, soda ash, calcite, dolomite, zinc oxide and barium carbonate, the transparent glass metal of free from admixture uniformly is smelted into after mixing, it is described
Glass metal throws away ultra-fine fibre glass by the centrifugal pan of high speed rotation again；
(2) cotton is collected：The ultra-fine fibre glass in step (1) is laid according to certain arrangement by negative pressure induced wind and had
On the cotton collecting machine guipure of plastic sheeting, glass fibre cotton is obtained；
(3) clot：Glass fibre cotton in step (2) is collected into ultra-fine fibre glass dry method by curler and rolls up cotton；
(4) cotton is spread：The plastic sheeting on the ultra-fine fibre glass dry method volume cotton in step (3) is gone using automatic paving cotton machine
Remove, wet method core material of vacuum heat insulation plate then is laid in into the ultra-fine fibre glass dry method rolls up cotton surface, obtains for dry method heat
The composite bed of pressure；
(5) hot pressing：Composite bed in step (4) is at the uniform velocity continuously tapped in the ball carry out in plate-type hot-pressing stove continuous hot-press into
Type, obtain the compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity.
Further, in step (1), the temperature of the glass metal is 1030 ± 10 DEG C；When the glass metal enters centrifugal pan
Glass liquid stream plume amount is 90~450kg/h；The temperature of the centrifugal pan is 985 ± 10 DEG C.
Further, in step (2), the frequency of the negative pressure induced wind is 15~45Hz, and the ultra-fine fibre glass falls speed
Spend for 25~40m/s.
Further, in step (2), the plastic sheeting is fusing point >=155 DEG C, and thickness is that 5~18 μm of polyvinyl chloride is thin
One kind in film or polyethylene film.
Further, in step (4), the surface density of the composite bed is 500~8000g/m2, thickness deviation≤4mm, edge
Range deviation≤3.5mm.
Further, in step (5), the screen plate hot pressing furnace have successively 400~580 DEG C, 580~680 DEG C and 450~
680 DEG C of three sections of temperature ranges, the distance between web plate up and down >=5mm of the screen plate hot pressing furnace, the screen plate hot pressing furnace
Web plate up and down speed it is identical with the speed that the composite bed is at the uniform velocity continuously pushed into, be 1~12m/min.
Further, methods described also includes cutting after hot-pressing, and the cutting is carried out using water jets under high pressure, the water under high pressure
The pressure of post is 30~150MPa.
The beneficial effects of the present invention are：The present invention provides a kind of compound dry method hot pressing vacuum insulation plate core of low thermal conductivity
Material and preparation method thereof, the core material of vacuum heat insulation plate realize ultra-fine fibre glass dry method volume cotton and wet method core material of vacuum heat insulation plate
Seamless combination, without bonding agent or artificial suture, the thermal conductivity factor for the core material of vacuum heat insulation plate for making to make further reduces, table
Surface evenness is higher, and this method is included into fine, collection cotton, clot, paving cotton, hot pressing and cutting, each anti-by controlling into the fine stage
The dosage and manufacturing condition of raw material are answered, finally prepares the normal distribution of diameter 93% at 2.5~6 μm, the normal state of length 92%
It is distributed in 25~50mm ultra-fine fibre glass；In the collection cotton stage, using the ultra-fine fibre glass as raw material, by controlling negative pressure to draw
The falling speed of wind frequency and ultra-fine fibre glass, the glass fibre cotton with excellent uniformity is prepared, and with the glass
Cellucotton is that raw material prepares dry method and rolls up cotton, then it is 0.5~10mm that dry method is rolled up into cotton and thickness, the uniformity≤5% of surface density/
m2, wet method core material of vacuum heat insulation plate hot pressing that thermal conductivity factor is 28.0~32.1mW/MK formed tensile strength be 0.5~
0.8MPa, bending strength are 0.3~0.5MPa, and thermal conductivity factor is 0.018~0.023W/ (mK), and density is 155~325Kg/
m3, thickness is 8~50mm core material of vacuum heat insulation plate；This method will ultra-fine fibre glass production process and hot pressing in the prior art
Process separates, and two-step is individually carried out, and not only solves hot pressing in the prior art and ultra-fine fibre glass production line is double
Square speeds match problem, the production process of different performance ultra-fine fibre glass is coordinated with the hot pressing process and carry out, meanwhile,
Hot pressing mode is continuous hot-press in this method, it is not necessary to stops the dwell time, realizes continuous production, effectively improves production effect
Rate and reduction production cost.
Embodiment
The preferred embodiments of the present invention will be described in detail below.
Embodiment 1
Prepare a kind of compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity
1) into fibre：67 parts of quartz sands, 5 parts of soda ash, 4.5 parts of potassium feldspars, 3.5 parts of albites, 4 parts of side's solutions are weighed in mass ratio
Stone, 6.5 parts of boraxs, 6 parts of dolomites, 2.5 parts of barium carbonates and 1 part of zinc oxide, kiln calcining is uniformly put into after mixing, and be smelted into
The glass metal that composition is uniform, free from admixture is transparent, the temperature of gained glass metal is 1040 DEG C；The glass metal again by bushing with
The temperature that 235kg/h flow flows into rotation at a high speed is to throw away ultra-fine fibre glass, gained superfine glass in 985 DEG C of centrifugal pan
Fiber is by mass percentage, composed of the following components：SiO2：67wt%, Na2O：7wt%, K2O：3wt%, Al2O3：
4.5wt%, MgO：3wt%, CaO：6wt%, B2O3：6wt%, Fe2O3：0.1wt%, ZnO：1.9wt%, BaO：1.5wt%,
Its normal distribution of diameter 93% is at 3.5~5 μm, and the normal distribution of fibre length 92% is in 35~40mm；；
(2) cotton is collected：The ultra-fine fibre glass in step (1) is pressed with 32m/s falling speed by 43Hz negative pressure induced winds
It is 155 DEG C, on the cotton collecting machine guipure of the polyethylene film of 14 μm of thickness to be laid according to certain arrangement with fusing point, acquisition glass
Cellucotton；
(3) clot：Glass fibre cotton in step (2) is collected into ultra-fine fibre glass dry method by curler and rolls up cotton；
(4) cotton is spread：Using the automatic cotton machine that spreads by the polyethylene film on the ultra-fine fibre glass dry method volume cotton in step (3)
Remove, be then 1.2mm, the uniformity≤5%/m of surface density by thickness2, thermal conductivity factor is 30.0mW/MK wet method vacuum
Insulated panel core material is laid in the ultra-fine fibre glass dry method volume cotton surface, obtains the composite bed for dry method hot pressing, wherein, institute
State wet method core material of vacuum heat insulation plate by mass percentage, it is composed of the following components：SiO2：65wt%, Na2O+K2O：14wt%,
Al2O3：3wt%, MgO：4wt%, CaO：6wt%, B2O3：6wt%, Fe2O3：0.1wt%, ZnO：1.0wt%, BaO：
0.9wt%；The surface density of the composite bed is 3200g/m2, thickness deviation≤4mm, Edge Distance deviation≤3.5mm, composite bed
The mass percent of middle ultra-fine fibre glass dry method volume cotton is 73wt%, and the mass percent of wet method core material of vacuum heat insulation plate is
27wt%.
(5) hot pressing：Dry method hot pressing raw cotton in step (4) is at the uniform velocity continuously pushed into by 3.5m/min speed to be had successively
Continuous hot-press shaping is carried out in the screen plate hot pressing furnace of 450 DEG C, 650 DEG C and 550 DEG C three sections of humidity provinces, the screen plate hot pressing furnace
The distance between upper and lower web plate 11mm, the speed of the web plate up and down of the screen plate hot pressing furnace is 3.5m/min, obtains low heat conduction
The compound dry method hot pressing core material of vacuum heat insulation plate of coefficient；
(6) cut：Water jets under high pressure that pressure is 120MPa is used to the compound dry method of low thermal conductivity for preparing in step (5)
Hot pressing core material of vacuum heat insulation plate size needed for is cut.
The compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity of above-mentioned preparation is detected, measures the core
Thickness is 12mm, density 195Kg/m3, thermal conductivity factor is 0.0215W/ (mK), tensile strength 0.55MPa, bending strength
For 0.35MPa.
Embodiment 2
Prepare a kind of compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity
1) into fibre：66 parts of quartz sands, 4 parts of soda ash, 3.5 parts of potassium feldspars, 4.5 parts of albites, 4 parts of side's solutions are weighed in mass ratio
Stone, 8 parts of boraxs, 5 parts of dolomites, 3.5 parts of barium carbonates and 1.5 parts of zinc oxide, kiln calcining is uniformly put into after mixing, and be smelted into
The glass metal that composition is uniform, free from admixture is transparent, the temperature of gained glass metal is 1040 DEG C；The glass metal again by bushing with
The temperature that 350kg/h flow flows into rotation at a high speed is to throw away ultra-fine fibre glass, gained superfine glass in 990 DEG C of centrifugal pan
Fiber is by mass percentage, composed of the following components：SiO2：68wt%, Na2O：5.5wt%, K2O：2wt%, Al2O3：
4.5wt%, MgO：4.5wt%, CaO：6wt%, B2O3：7wt%, Fe2O3：0.05wt%, ZnO：1.95wt%, BaO：
0.5wt%, its normal distribution of diameter 93% is at 2.5~3.4 μm, and the normal distribution of fibre length 92% is in 40~50mm；；
(2) cotton is collected：The ultra-fine fibre glass in step (1) is pressed with 40m/s falling speed by 45Hz negative pressure induced winds
It is 155 DEG C, on the cotton collecting machine guipure of the polyvinyl chloride film of 9 μm of thickness to be laid according to certain arrangement with fusing point, acquisition glass
Glass cellucotton；
(3) clot：Glass fibre cotton in step (2) is collected into ultra-fine fibre glass dry method by curler and rolls up cotton；
(4) cotton is spread：It is using automatic paving cotton machine that the polyvinyl chloride on the ultra-fine fibre glass dry method volume cotton in step (3) is thin
Film removes, and is then 0.7mm, the uniformity≤5%/m of surface density by thickness2, thermal conductivity factor is that 28.0mW/MK wet method is true
Empty insulated panel core material is laid in the ultra-fine fibre glass dry method volume cotton surface, obtains the composite bed for dry method hot pressing, wherein,
The wet method core material of vacuum heat insulation plate is by mass percentage, composed of the following components：SiO2：64wt%, Na2O+K2O：
15wt%, Al2O3：4wt%, MgO：4wt%, CaO：6wt%, B2O3：5.5wt%, Fe2O3：0.12wt%, ZnO：
1.38wt%, BaO：1.0wt%；The surface density of the composite bed is 6000g/m2, thickness deviation≤2mm, Edge Distance deviation
≤ 2mm, the mass percent of ultra-fine fibre glass dry method volume cotton is 80wt% in composite bed, the matter of wet method core material of vacuum heat insulation plate
Amount percentage is 20wt%.
(5) hot pressing：Dry method hot pressing raw cotton in step (4) is at the uniform velocity continuously pushed into by 9m/min speed to be had successively
Continuous hot-press shaping is carried out in the screen plate hot pressing furnace of 480 DEG C, 655 DEG C and 560 DEG C three sections of humidity provinces, the screen plate hot pressing furnace
The distance between upper and lower web plate 20mm, the speed of the web plate up and down of the screen plate hot pressing furnace is 9m/min, obtains low heat conduction system
The compound dry method hot pressing core material of vacuum heat insulation plate of number；
(6) cut：Water jets under high pressure that pressure is 120MPa is used to the compound dry method of low thermal conductivity for preparing in step (5)
Hot pressing core material of vacuum heat insulation plate size needed for is cut.
The compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity of above-mentioned preparation is detected, measures the core
Thickness is 20mm, density 285Kg/m3, thermal conductivity factor is 0.020W/ (mK), tensile strength 0.6MPa, and bending strength is
0.4MPa。
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (10)
1. a kind of compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity, it is characterised in that by mass percentage, described
Core material of vacuum heat insulation plate rolls up cotton and 20~30wt% wet method core material of vacuum heat insulation plate by 70~80wt% ultra-fine fibre glasses dry method
Hot pressing forms.
A kind of 2. compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity as claimed in claim 1, it is characterised in that institute
The normal distribution of diameter 93% of the ultra-fine fibre glass in ultra-fine fibre glass dry method volume cotton is stated at 2.5~6 μm, length 92% is just
State is distributed in 25~50mm.
3. a kind of compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity as claimed in claim 2, it is characterised in that press
Mass percent meter, the ultra-fine fibre glass dry method volume cotton include following component：SiO2：62.5~72wt%, Na2O：5.5~
10.5wt%, K2O：2~3.5wt%, Al2O3：2.5~6.5wt%, MgO：3~6wt%, CaO：5~8wt%, B2O3：4~
8.5wt%, Fe2O3：0.05~0.1wt%, ZnO：0.8~2.5wt%, BaO：0.5~3.5wt%.
A kind of 4. compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity as claimed in claim 1, it is characterised in that institute
The thickness for stating wet method core material of vacuum heat insulation plate is 0.5~10mm, the uniformity≤5%/m of surface density2, thermal conductivity factor be 28.5~
32.1mW/M·K。
5. a kind of compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity as claimed in claim 4, it is characterised in that press
Mass percent meter, the wet method core material of vacuum heat insulation plate include following component：SiO2：63~70wt%, Na2O+K2O：14.5
~17.5wt%, Al2O3：2~4.5wt%, MgO：2~4wt%, CaO：5~8wt%, B2O3：5~8wt%, Fe2O3：0.05
~0.12wt%, ZnO：0.6~1.4wt%, BaO：0.8~1.2wt%.
A kind of 6. preparation of the compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity described in any one of Claims 1 to 5
Method, it is characterised in that comprise the following steps：
(1) into fibre：Cotton constituent is rolled up according to ultra-fine fibre glass dry method and chooses quartz sand, albite, potassium feldspar, borax, pure
Alkali, calcite, dolomite, zinc oxide and barium carbonate, uniformly it is smelted into the transparent glass metal of free from admixture, the glass metal after mixing
Ultra-fine fibre glass is thrown away by the centrifugal pan of high speed rotation again；
(2) cotton is collected：The ultra-fine fibre glass in step (1) is laid in plastics according to certain arrangement by negative pressure induced wind
On the cotton collecting machine guipure of film, glass fibre cotton is obtained；
(3) clot：Glass fibre cotton in step (2) is collected into ultra-fine fibre glass dry method by curler and rolls up cotton；
(4) cotton is spread：The plastic sheeting on the ultra-fine fibre glass dry method volume cotton in step (3) is removed using automatic paving cotton machine,
Then wet method core material of vacuum heat insulation plate is laid in the ultra-fine fibre glass dry method and rolls up cotton surface, obtained for dry method hot pressing
Composite bed；
(5) hot pressing：Composite bed in step (4) is at the uniform velocity continuously tapped in the ball, and plate-type hot-pressing stove is interior to carry out continuous hot-press shaping, obtains
Obtain the compound dry method hot pressing core material of vacuum heat insulation plate of low thermal conductivity.
7. preparation method as claimed in claim 6, it is characterised in that in step (2), the frequency of the negative pressure induced wind for 15~
45Hz, the ultra-fine fibre glass speed of fall are 25~40m/s.
8. preparation method as claimed in claim 6, it is characterised in that in step (4), the surface density of the composite bed is 500
~8000g/m2, thickness deviation≤4mm, Edge Distance deviation≤3.5mm.
9. preparation method as claimed in claim 6, it is characterised in that in step (5), the screen plate hot pressing furnace has successively
400~580 DEG C, 580~680 DEG C and 450~680 DEG C three sections of temperature ranges, between the web plate up and down of the screen plate hot pressing furnace
Distance >=5mm, the speed phase that the speed of the web plate up and down of the screen plate hot pressing furnace is at the uniform velocity continuously pushed into the composite bed
Together, it is 1~12m/min.
10. the preparation method as described in any one of claim 6~9, it is characterised in that methods described also includes dividing after hot-pressing
Cut, the cutting is carried out using water jets under high pressure, and the pressure of the water jets under high pressure is 30~150MPa.
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| CN108754852A (en) * | 2018-05-29 | 2018-11-06 | 江苏九鼎新材料股份有限公司 | A kind of production method of continuous Glass Fiber Mat |
| CN113308795A (en) * | 2021-05-14 | 2021-08-27 | 安徽吉曜玻璃微纤有限公司 | Online continuous production system and method for glass microfiber dry-process insulation board core material |
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Application publication date: 20180130 |
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