CN104295860B

CN104295860B - A kind of vacuum heat-insulating plate etching glass fibre

Info

Publication number: CN104295860B
Application number: CN201410404191.8A
Authority: CN
Inventors: 李载润; 梁京秀
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-08-18
Filing date: 2014-08-18
Publication date: 2016-08-24
Anticipated expiration: 2034-08-18
Also published as: CN104295860A

Abstract

The invention discloses a kind of vacuum heat-insulating plate etching glass fibre, including the glass fibre core being arranged in high-isolation bag and adsorbent, glass fibre core is the warming plate that the glass fibre of below diameter 3um is made in a wet process, is characterized in that using etching solution content is that the aqueous solution of 3 ~ 5 wt% is to the SiO in core₂It is etched, makes the SiO after etching₂Content reduce by 5 ~ 20 wt%, the structural component that the core after etching is cleaned, to be human body after drying harmless；Described etching solution is formulated by 33 ~ 47:7 ~ 8:45 ~ 60 wt% with Fluohydric acid. and water by ammonium fluoride；Described etching period is 10 ~ 20 minutes.The present invention compared with prior art has the feature that pyroconductivity is low and KI index is high, and core material structure component is harmless, is greatly improved heat-proof quality and the durability of vacuum heat-insulating plate, and processing technology is simple, easy to process, high insulating effect.

Description

A kind of vacuum heat-insulating plate etching glass fibre

Technical field

The present invention relates to building thermal insulation material technical field, a kind of vacuum heat-insulating plate etching glass fibre.

Background technology

Vacuum heat-insulating plate is heat-proof quality to be substantially improved by internal vacuum, by keeping the core of external morphology, intercepting extraneous gas and high-isolation bag that moisture flows into, adsorb and removes and be flowed into the adsorbent of internal gas and moisture and form.The heat-proof quality of usual vacuum heat-insulating plate is 10 times of polyurethane, and the field being used in the insulating efficiency requirements such as refrigerator, vending machine and building high is greatly decreased energy consumption and receives much concern.Core mainly uses fiber or the particle of porous inorganic material, selects to use according to purposes and price, and inorfil mainly uses price low, and low-thermal conductivity glass fibre of good performance is as core.It is generally divided into glass fibre (fibre diameter 3 ~ 6um), microfibre (below fibre diameter 3um), and the long fibre (fibre diameter 3 ~ 9um) strengthened for plastics.Glass fibre for vacuum heat-insulating plate has two dot characteristics to be very important at aspect of performance, and first is the solid thermal conductivity formed by point cantact in glass fiber laminates, and second is the pore size between glass fibre.Normally used glass fibre is diameter 3 ~ 9um, and now pore size is usually 40 ~ 80um, and solid thermal conductivity is more than 1mw/mk, and durability is 1st/1/5th ~ ten of silicon dioxide vacuum heat-insulating plate.The diameter of glass fibre uses the microfibre of below 3um, and its little durability in aperture is strong, and pyroconductivity is also greatly reduced, but is because relating to the problem that human body is harmful, and the glass fibre of below 3um is difficult to use.In EU criteria Directive 97/69/EC it can be seen that, it is stipulated that below average diameter 6um of inorfil, be unsatisfactory for during the condition of zoopery or special component having carcinogenic danger.The bio-soluble assay method of glass fibre is to utilize KI Index or solubility constant value, KI Index: KI=(Na₂O + K₂O + CaO + MgO + B₂O₃+ BaO) – 2XAl₂O₃, general KI index is more than 40 harmless for human body, but meets this structure and reach what the physical property of core material of vacuum heat insulation plate was very difficult to.

The glass fibre structure component being presently used for vacuum heat-insulating plate is SiO₂50~70 wt%,；Al₂O₃1~5wt%,；Na₂O+K₂O 5~10wt%,；CaO 5~15wt%,；MgO 1~5wt%,；B₂O₅ 2 ~ 10wt%, is converted by KI index and obtains less than 40, is the structural component that human body is harmful in the case of 6um diameter.

Summary of the invention

It is an object of the invention to provide a kind of vacuum heat-insulating plate etching glass fibre for the deficiencies in the prior art, use the etching solution that ammonium fluoride is formulated with Fluohydric acid., the glass fibre of below diameter 3um the core made is etched, to reduce SiO₂Structural component in glass fibre improves KI index, it is achieved low-thermal conductivity and the vacuum heat-insulating plate that core is the harmless structural component of human body, and processing technology is simple, easy to process, and high insulating effect significantly improves heat-proof quality and the durability of vacuum heat-insulating plate.

The concrete technical scheme realizing the object of the invention is: a kind of vacuum heat-insulating plate etching glass fibre, including the glass fibre core being arranged in high-isolation bag and adsorbent, glass fibre core is the warming plate that the glass fibre of below diameter 3um is made in a wet process, is characterized in that using etching solution (BOE) content is that the aqueous solution of 3 ~ 5 wt% is to the SiO in glass fibre core₂It is etched, makes the SiO after etching₂Content in glass fibre reduces by 5 ~ 20 wt%, the structural component that the glass fibre core of etching is cleaned, to be human body after drying harmless；Described etching solution (BOE) is by ammonium fluoride (NH₄F) formulated by 33 ~ 47:7 ~ 8:45 ~ 60 wt% with Fluohydric acid. (HF) and water；Described etching period is 10 ~ 20 minutes；Described ammonium fluoride (NH₄And Fluohydric acid. (HF) is chemical pure F).

The present invention compared with prior art has the feature that pyroconductivity is low and KI index is high, and core material structure component is harmless, is greatly improved heat-proof quality and the durability of vacuum heat-insulating plate, and processing technology is simple, easy to process, high insulating effect.

Accompanying drawing explanation

Fig. 1 is present configuration schematic diagram.

Detailed description of the invention

Refering to accompanying drawing 1, the present invention is made up of the glass fibre core 2 being arranged in high-isolation bag 1 and adsorbent 3, glass fibre core 2 is the warming plate that the glass fibre of below diameter 3um is made in a wet process, will be further elaborated the etching of the present invention by specific embodiment below:

Embodiment 1

By chemical pure ammonium fluoride (NH₄F) it is configured to etching solution (BOE) with chemical pure Fluohydric acid. (HF) and water by 35:7:58 wt%, then etching solution (BOE) is diluted with water to aqueous solution that BOE content is 3wt% to the SiO in glass fibre core 2₂It is etched, glass fibre core 2 is put in the etching solution (BOE) of above-mentioned configuration and soak 20 minutes so that SiO₂Content in glass fibre is reduced to 11 wt%, glass fibre core 2 is cleaned, make the vacuum heat-insulating plate of the harmless structural component of human body after drying to etch taking-up after terminating, its pyroconductivity reduces about 15% after the etching, KI index is by being 32.61 to bring up to 40.04 before etching, and heat-proof quality significantly improves.

Embodiment 2

By chemical pure ammonium fluoride (NH₄F) it is configured to etching solution (BOE) with chemical pure Fluohydric acid. (HF) and water by 40:8:52 wt%, then etching solution (BOE) is diluted with water to aqueous solution that BOE content is 5wt% to the SiO in glass fibre core 2₂It is etched, glass fibre core 2 is put in the etching solution (BOE) of above-mentioned configuration and soak 20 minutes so that SiO₂Content in glass fibre is reduced to 15 wt%, glass fibre core 2 is cleaned, make the vacuum heat-insulating plate of the harmless structural component of human body after drying to etch taking-up after terminating, its pyroconductivity reduces about 20% after the etching, KI index is by being 31.05 to bring up to be 40.62 before etching, and heat-proof quality significantly improves.

After the glass fibre core 2 of the present invention is etched liquid (BOE) immersion, the SiO in its glass fibre₂Content is etched reduction, and the content of other compositions relatively increases, and makes the SiO of the microfibre of glass fibre and vertical direction₂It is etched and removes, reduce the effect of pyroconductivity, significantly improve heat-proof quality and the durability of vacuum heat-insulating plate.More than simply the present invention is further illustrated, and is not used to limit practicing of this patent, all implements for equivalence of the present invention, within being intended to be limited solely by the right of this patent.

Claims

1. the vacuum heat-insulating plate etching glass fibre, including the glass fibre core being arranged in high-isolation bag and adsorbent, glass fibre core is the warming plate that the glass fibre of below diameter 3um is made in a wet process, it is characterised in that using etching solution (BOE) content is that the aqueous solution of 3 ~ 5 wt% is to the SiO in glass fibre core₂It is etched, makes the SiO after etching₂Content in glass fibre reduces by 5 ~ 20 wt%, the structural component that the glass fibre core of etching is cleaned, to be human body after drying harmless；Described etching solution (BOE) is by ammonium fluoride (NH₄F) 33 ~ 47:7 ~ 8:45 ~ 60 wt% is pressed with Fluohydric acid. (HF) and water Formulated；Described etching period is 10 ~ 20 minutes；Described ammonium fluoride (NH₄And Fluohydric acid. (HF) is chemical pure F).