CN102442777A

CN102442777A - Lead-free glass for energy-saving lamp

Info

Publication number: CN102442777A
Application number: CN2011102609985A
Authority: CN
Inventors: 孙晓玉; 方松金; 张海珍
Original assignee: XIAMEN TOPSTAR NEW MATERIALS CO Ltd
Current assignee: XIAMEN TOPSTAR NEW MATERIALS CO Ltd
Priority date: 2011-09-02
Filing date: 2011-09-02
Publication date: 2012-05-09

Abstract

The invention discloses lead-free glass for an energy-saving lamp, which is characterized by comprising the following components in percentage by mass: 60-70% of SiO2, 1.5-4.0% of Al2O3, 8-10% of Na2O, 3.5-7.0% of K2O, 0.5-1.5% of Li2O, 1.5-3.5% of CaO, 0.3-2.0% of MgO, 7-10% of BaO, 1.0-2.7% of SrO, 0-1.5% of B2O3 and 0-1.5% of CeO2. Beside satisfying the human health requirements for the lead-free environment and the appropriate expansion factor and softening point temperature, the technical scheme also has fine ultraviolet absorption capability. On one hand, the glass itself can keep favorable stability under ultraviolet irradiation when being used for energy-saving lamp tubes; and on the other hand, the influence of great ultraviolet projection on the human health can be avoided.

Description

A kind of electricity-saving lamp crown glass

Technical field

The present invention relates to a kind of glass, specifically is the crown glass that a kind of energy-saving lamp tube adopts.

Background technology

The crown glass that power saving fluorescent lamps adopted in the industry cycle has abundant kind.The characteristics of this type glass are not contain lead element; Simultaneously its machinery will reach relevant lighting criteria requirement with optical property, and these require relevant performances to relate to: be used to describe the coefficient of expansion, softening temperature, ultraviolet radiation stability, absorption ray ability of hot workability etc.Therefore, the used crown glass of this type fluorescent tube should be considered mechanical property and safety, considers the effect of environmental protection, healthy aspect again.At present, with regard to mechanical properties such as the coefficient of expansion, softening temperature, stability, most schemes have obtained considerable and stable progress, can meet the demands; But the right problem of demand side is the requirement that how to improve environmental protection, health further; Also promptly satisfy be easy to process, under the prerequisite of good stability; How to have good HUMAN HEALTH characteristic, this is the major issue that this type glass, fluorescent tube design face now as far as possible.

Summary of the invention

Based on the major issue that faces with upper glass, fluorescent tube design, the present invention proposes a kind of electricity-saving lamp crown glass, and its technical scheme is following:

A kind of electricity-saving lamp crown glass, it comprises following component and corresponding quality ratio range:

A preferred person as the present technique scheme is characterized in that: it comprises following component and corresponding quality proportioning:

The beneficial effect that the present invention brings is:

Except satisfy that unleaded HUMAN HEALTH requires and the suitable coefficient of expansion and softening point temperature; Also has the ultraviolet ability of excellent absorption; Keep this satisfactory stability property under uviolizing of glass when being used for power saving fluorescent lamps on the one hand; Avoid a large amount of ultraviolet ray projections that HUMAN HEALTH is exerted an influence on the other hand

Embodiment

Individual component and mass ratio thereof that one embodiment of the invention adopted are respectively:

Part description to above each component has:

SiO ₂Be the skeleton of silicate glass, form irregular continuous grids with the structure constituent element of silicon-oxy tetrahedron.It can reduce the thermal expansivity of glass in glass, improve glass heat, chemicalstability, physical strength etc.SiO ₂Content improve, then its fusing point can improve, and correspondingly founds difficulty, and easy crystallization, therefore all is controlled at the mass percent scope of 60%-70% usually, the ratio of this example employing 68% has suitable fusing point.

Al ₂O ₃Can improve the toughness of glass; Also promptly aspect intensity, can bring gain, but its negative impact is also bigger, increases the viscosity of glass; It is glass difficult forming in the process of founding; In drawing process, also make simultaneously glass itself produce striped easily, improved the temperature of clarification, homogenizing, so its content also needs strict control.

Alkalimetal oxide, Na ₂O can lower the viscosity of glass, is the good fusing assistant of glass, is beneficial to machine-shaping, but Na ₂O itself can increase the coefficient of expansion of glass, reduces thermostability, chemicalstability and the physical strength of glass simultaneously, so content must control, and is unsuitable too high; K ₂O can reduce the tendency towards devitrification of glass, increases the transparency and the gloss of glass; And Li ₂O can reduce the glass melting temperature of glass, the quality and the output of lifting glass processing.

This mainly plays function of stabilizer CaO in glass, can increase the chemicalstability and the physical strength of glass, but the higher meeting of the content of itself is the crystallization tendency increase of glass, thereby makes the glass embrittlement; If when having introduced CaO; Consider to introduce part MgO and substitute original component partial C aO, then can reduce the setting rate of glass, also reduced the crystallization tendency and the crystallization velocity of glass simultaneously; Therefore, the combination of CaO and MgO can more thorough ground lifting glass stability and physical strength.

BaO can be used for regulating the optical effect of glass, such as specific refractory power, glossiness, also can influence the density and the chemicalstability of glass simultaneously.

B ₂O ₃Can reduce the coefficient of expansion of glass, improve heat, chemicalstability and the mechanical property of glass, also can play the effect of fusing assistant, quicken the clarification of glass and the crystallizing power of reduction glass; But the also necessary careful control of its content, otherwise too high levels can make the coefficient of expansion increase on the contrary.

The effect of SrO is between CaO and BaO, and SrO can absorb the ray of considerable part, comprises ultraviolet portion;

CeO ₂Can be shared as oxygenant and finings with nitrate salt, improve the ultraviolet ability of absorption simultaneously, and improve the stability that glass receives uviolizing.Between this, SrO and CeO ₂On the HUMAN HEALTH performance of electricity-saving lamp glass, play an important role jointly, absorbed the ultraviolet ray of suitable composition, keep the stable of glass simultaneously.So, when the breakdown work of fluorescent tube, can prevent that its inner a large amount of ultraviolet rays from causing damage to glass itself and outside human body.

In the actual processing, the present technique scheme still can be used than common processes and make, and at first various raw materials are by proportioning, and process automatic weighing system and mixed organization are transported to furnace hopper through the batch can car after mixing, and reduce the layering of admixtion in the transportation; Compound adopts full electrical kiln to found, and utilizes automatic charging equipment to carry out blanket charging, through the thickness of control material blanket and stable liquid level, reduces volatilization and thermal losses simultaneously; Glass metal after the fusing clarification at last via swivel pipe, tube drawing bench, obtains the crown glass pipe that parameters such as external diameter, wall thickness meet particular requirement through behind the retort furnace under the intervention of laser detecting apparatus.The glass sample that obtains in this example, the national light industry glassy product quality surveillance of process inspection center is detected, and detects according to QB/T2298-1997, SJ/T11038-1996 standard, and its coefficient of linear expansion is 9.60 * 10 ^-6K ^-1(20 ℃-300 ℃), its softening temperature is 685 ℃, meets the hot workability index that is used for the electricity-saving lamp outer glass tube, it all has preferable performance for ultraviolet absorption and stability simultaneously.

The above is merely preferred embodiment of the present invention, so can not limit the scope that the present invention implements according to this, the equivalence of promptly doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.

Claims

1. electricity-saving lamp crown glass is characterized in that: it comprises following component and corresponding quality ratio range:

2. a kind of electricity-saving lamp crown glass according to claim 1 is characterized in that: it comprises following component and corresponding quality proportioning: