CN1064465A - The compound method of glaze of glazed coloured wall or floor tiles - Google Patents

The compound method of glaze of glazed coloured wall or floor tiles Download PDF

Info

Publication number
CN1064465A
CN1064465A CN 91101273 CN91101273A CN1064465A CN 1064465 A CN1064465 A CN 1064465A CN 91101273 CN91101273 CN 91101273 CN 91101273 A CN91101273 A CN 91101273A CN 1064465 A CN1064465 A CN 1064465A
Authority
CN
China
Prior art keywords
glaze
zircon
glass fibre
raw silk
compound method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN 91101273
Other languages
Chinese (zh)
Other versions
CN1026889C (en
Inventor
李浩义
戴长禄
王连海
苏明迪
李秀萍
纪长德
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANHUA CERAMICS FACTORY TANGSHAN CITY
Institute of Geology and Geophysics of CAS
Original Assignee
JIANHUA CERAMICS FACTORY TANGSHAN CITY
Institute of Geology and Geophysics of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JIANHUA CERAMICS FACTORY TANGSHAN CITY, Institute of Geology and Geophysics of CAS filed Critical JIANHUA CERAMICS FACTORY TANGSHAN CITY
Priority to CN 91101273 priority Critical patent/CN1026889C/en
Publication of CN1064465A publication Critical patent/CN1064465A/en
Application granted granted Critical
Publication of CN1026889C publication Critical patent/CN1026889C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C8/00Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
    • C03C8/02Frit compositions, i.e. in a powdered or comminuted form

Abstract

A kind of glaze of glazed coloured wall or floor tiles compound method belongs to the compound method of architectural pottery glaze.It is characterized in that the glass fibre raw silk of introducing 10-60% in the glaze process for preparation substitutes frit, preparation glaze of glazed coloured wall or floor tiles, several in the selection following raw materials according, its proportioning is: glass fibre raw silk 10-60%, zircon 0-15%, illite clay 0-40%, wollastonite and/or diopside 0-50%, feldspar 0-20%, aluminium sesquioxide 0-10%, zinc oxide 0-10%, quartzy 0-15%, kaolin 0-15%, pigment (adding) 0-15%.The present invention has that power consumption is low, and cost is low, avoids suffering the infringement of the toxic compounds that brings because of preparation clinker glaze process, also can avoid high temperature, noise, pollutions such as dust.

Description

The compound method of glaze of glazed coloured wall or floor tiles
A kind of compound method of color glazed tile glaze belongs to the compound method of architectural pottery glaze.
Advanced in the world country's production is adopted glaze wall floor tile and is all adopted cryogenic quick burning technology, for realizing cryogenic quick burning, all adopt the glaze system of clinker glaze, earlier with borax, boric acid, saltpetre, water-soluble or toxic chemical raw and quartz such as red lead, feldspar, zinc oxide, lime carbonate, raw materials such as wollastonite mix according to a certain ratio, at high temperature found solution based on glassy phase, obtain frit through water liquid again, then with frit again with quartz, feldspar, zinc oxide, wollastonite, lime carbonate, aluminum oxide, illite clay, a kind of or several raw materials mixing in the kaolin are milled down to certain fineness, promptly obtain glaze of glazed coloured wall or floor tiles, advantage is that glaze easily mates with various base substrates, reduces the stripping quantity of the toxic substance of glaze, its weak point is the cost height, power consumption is high, is subject to the murder by poisoning of toxic compounds in the process for preparation, in the production with high temperature, noise, infringements such as dust.
The compound method of a kind of glaze of glazed coloured wall or floor tiles that needn't frit that the objective of the invention is to avoid above-mentioned weak point of the prior art and provide, this method cost is low, it is low to consume energy, and can avoid suffering the infringement of the toxic compounds that brings because of preparation fritted glaze process, also can avoid pollutions such as high temperature, noise, dust.
Purpose of the present invention can realize by following measure: the compound method of glaze of glazed coloured wall or floor tiles, the compound method that belongs to the architectural pottery glaze, generally be with frit and other raw material based on glassy phase, generally with zircon, feldspar, quartz, zinc oxide, lime carbonate, wollastonite, red lead, aluminium sesquioxide, in illite clay, the kaolin several mix fine grinding according to a certain ratio, make glaze, its glaze can be divided into ground-coat enamel and cover-coat enamel.Prior art generally is the glaze system of fritted glaze, is the series of malpractice of avoiding bringing because of founding of clinker, and the proximate raw material of Chemical Composition of seeking a kind of and former frit is incorporated in the glaze process for preparation.The invention is characterized in that the glass fibre raw silk of introducing 10-60% in the supporting system process of glaze substitutes frit preparation glaze of glazed coloured wall or floor tiles.Glass fibre is to be smoked to dial by the vitreum of 1100 ℃ of fusings to form, and be under 1300 ℃ high temperature, to found based on the frit of glassy phase, and make through shrend, can substitute frit with glass fibre fully, and required other raw material reasonably allocated the preparation glaze.The glass fibre raw silk is fracture of wire, the waste silk that produces in the glass fibre production process, and a large amount of glass fibre raw silks brings harm for glass fibre factory, simultaneously again for the invention provides a large amount of raw materials, turns waste into wealth, and benefits the nation and the people.The preparation glaze of glazed coloured wall or floor tiles is selected several in the following raw materials according, its proportioning is: glass fibre raw silk 10-60%, zircon 0-15%, illite clay 0-40%, wollastonite or diopside 0-50%, feldspar 0-20%, aluminium sesquioxide 0-10%, zinc oxide 0-10%, quartzy 0-15%, kaolin 0-15%, pigment (adding) 0-15%.
Glaze of glazed coloured wall or floor tiles can be divided into ground-coat enamel and cover-coat enamel, below ground-coat enamel and cover-coat enamel is narrated respectively, and the proportioning of ground-coat enamel is glass fibre raw silk 20-40%, zircon 0-15%, illite clay 0-30%, feldspar 0-20%, aluminium sesquioxide 0-5%, quartzy 5-15%, kaolin 0-15%, its preferable proportioning is: glass fibre raw silk 20-40%, quartzy 5-15%, zircon 5-15%, feldspar 0-10%, kaolin 5-15%, illite clay 10-30%, aluminium sesquioxide 0-5%.The proportioning of cover-coat enamel is: glass fibre raw silk 10-60%, wollastonite and (or) diopside 10-50%, zircon 0-15%, illite clay 0-40%, feldspar 0-10%, aluminium sesquioxide 0-5%, or glass fibre raw silk 10-60%, wollastonite and (or) diopside 0-30%, zircon 5-15%, illite clay 0-25%, feldspar 0-20%, zinc oxide 0-10%, aluminium sesquioxide 5-15%, kaolin 0-15%.。The optimal components ratio of its cover-coat enamel is: glass fibre raw silk 25-50%, wollastonite and (or) diopside 20-35%, zircon 5-10%, illite clay 15-25%, feldspar 0-10%, aluminium sesquioxide 0-5%, perhaps glass fibre raw silk 25-35%, zircon 5-10%, wollastonite 15-25%, feldspar 10-15%, illite clay 10-15%, zinc oxide 0-5%, aluminium sesquioxide 5-10%, kaolin 0-5%.
The Chemical Composition (weight %) that the present invention is raw materials used
Figure 911012737_IMG1
The Chemical Composition of glass fibre raw silk following (weight %)
Glass fibre raw silk kind SiO 2 Al 2O 3 CaO MgO Na 2O K 2O B 2O 3
Middle alkali fiber raw silk 67.3±0.5 6.4±0.4 9.5±0.3 4.2±0.3 11.9±0.4 <0.5 -
No alkali fiber raw silk 54.1±0.5 14.6±0.4 16.6±0.3 4.6±0.3 - <0.8% 8.8±0.3
The present invention has compared to existing technology that cost is low, power consumption is low, and can avoid suffering encroaching on because of the toxic compounds that preparation fritted glaze process is brought, and also can avoid pollutions such as high temperature, noise, dust.
The present invention will now be further detailed embodiment:
The ground-coat enamel proportioning:
Embodiment 1, glass fibre raw silk 30%, zircon 10%, feldspar 15%, illite clay 25%, kaolin 5%.Quartzy 15%.
Embodiment 2, glass fibre raw silk 25%, zircon 15%, feldspar 20%, illite clay 25%, kaolin 15%.
The cover-coat enamel proportioning:
Embodiment 3, glass fibre raw silk 15%, zircon 15%, illite clay 40%, wollastonite 28%, aluminium sesquioxide 2%, pigment (adding) 6%.
Embodiment 4, glass fiber 30%, zircon 5%, diopside 5%, feldspar 10%, illite clay 20%, wollastonite 30%, aluminium sesquioxide 2%.
Embodiment 5, glass fibre raw silk 40%, zircon 5%, diopside 35%, feldspar 10%, illite clay 10%.
Embodiment 6, glass fibre raw silk 50%, wollastonite 40%, zircon 8%, illite clay 10%, aluminium sesquioxide 2%.
Embodiment 7, glass fibre raw silk 60%, wollastonite 30%, zircon 5%, aluminium sesquioxide 5%.
Embodiment 8, glass fibre raw silk 20%, feldspar 10%, zircon 5%, kaolin 5%, illite clay 25%, aluminium sesquioxide 10%.Zinc oxide 10%, wollastonite 15%.
Embodiment 9, glass fibre raw silk 30%, zircon 10%, feldspar 10%, aluminium sesquioxide 10%, zinc oxide 5%, illite clay 15%, wollastonite 20%.
Embodiment 10, glass fibre raw silk 40%, feldspar 20%, illite clay 15%, zircon clay 15%, diopside 20%.
Embodiment 11, glass fibre raw silk 50%, illite clay 15%, wollastonite 25%, zircon 5%, zinc oxide 5%.
Embodiment 12, glass fibre raw silk 60%, illite clay 15%, wollastonite 20%, zircon 5%,
The present invention can produce the matt glaze glaze and light (semi-matt) glaze is arranged, as the production matte glaze product, and available medium-alkali glass fibre raw silk, producing has light (semi-matt) glaze product, available alkali free glass fibre raw silk.The glaze of the present invention preparation is adapted at burning till in 1100-1150 ℃ the scope.
The glaze Chemical Composition scope following (weight %) of the present invention's preparation
Heavy glaze kind amount (%) composition Ground-coat enamel Unglazed cover-coat enamel Light (semi-matt) cover-coat enamel is arranged
SiO 2Al 2O 3 53.21-65.88 15.11-22.88 41.24-62.09 17.54-26.49 42.13-60.66 10.84-21.32
Fe 2O 3 0.20-0.44 0.12-0.41 0.15-0.30
TiO 2 0.18-0.48 0.10-0.30 0.07-0.38
CaO 1.62-4.08 8.03-17.12 10.78-25.03
MgO 0.94-1.65 0.88-5.54 0.72-8.87
K 2O 2.65-5.16 0.50-4.95 1.06-4.32
Na 2O 3.33-5.67 2.17-9.36 0.60-1.21
B 2O 3 -- -- 0.92-5.58
ZnO -- 0.00-11.23 --
ZrO 2Pigment (adding) 0.00-11.13 0.00-11.13 0-15% 0.00-11.13 0-15%

Claims (16)

1, a kind of glaze of glazed coloured wall or floor tiles compound method belongs to the compound method of architectural pottery glaze, generally with zircon, and feldspar, quartz, zinc oxide, carbide of calcium, wollastonite, red lead, aluminium sesquioxide, illite clay, several in the kaolin and frit.Mix fine grinding according to a certain ratio; Make glaze, its glaze can be divided into ground-coat enamel and cover-coat enamel, and the present invention is characterised in that glaze process for preparation introducing 10-60% glass fibre raw silk replaces frit, the preparation glaze of glazed coloured wall or floor tiles, several in the selection following raw materials according, its proportioning is: glass fibre raw silk 10-60%, zircon 0-15%, illite clay 0-40%, wollastonite or diopside 0-50%, feldspar 0-20%, aluminium sesquioxide 0-15%, zinc oxide 0-10%, quartzy 0-15%, kaolin 0-15% pigment (adding) 0-15%.
2, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 is characterized in that the proportioning of ground-coat enamel is: glass fibre raw silk 20-40%, zircon 0-15%, illite clay 0-30%, feldspar 0-20%, aluminium sesquioxide 0-5%, quartzy 5-15%, kaolin 0-15%, the proportioning of cover-coat enamel is: glass fibre raw silk 10-60%, wollastonite or diopside 10-50%, zircon 0-15%, illite clay 0-40%, feldspar 0-10%, aluminium sesquioxide 0-5%, or glass fibre raw silk 10-60%, wollastonite or diopside 0-30%, zircon 5-15%, illite clay 0-25%, feldspar 0-20%, zinc oxide 0-10%, aluminium sesquioxide 5-10%, kaolin 0-15%.
3, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the ground-coat enamel proportioning is: glass fibre raw silk 20-40%, quartzy 5-15%, zircon 5-10%, feldspar 0-10%, kaolin 5-15%, the clay 10-30% of Erie, aluminium sesquioxide 0-5%.
4, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the ground-coat enamel proportioning is: glass fibre raw silk 30%, zircon 10%, feldspar 15%, illite clay 25%, kaolin 5%.Quartzy 15%.
5, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the ground-coat enamel proportioning is: glass fibre raw silk 25%, zircon 15%, feldspar 20%, illite clay 25%, kaolin 15%.
6, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 25-50%, wollastonite and (or) diopside 20-35%, zircon 5-10%, illite clay 15-25%, feldspar 0-10%, aluminium sesquioxide 0-50%, perhaps glass fibre raw silk 25-35%, zircon 5-10%, wollastonite 15-25%, feldspar 10-15%, illite clay 10-15%, zinc oxide 0-5%, aluminium sesquioxide 5-10%, kaolin 0-5%.
7, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 15%, zircon 15%, illite clay 40%, wollastonite 28%, aluminium sesquioxide 2%, pigment (adding) 6%.
8, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fiber 30%, zircon 5%, diopside 5%, feldspar 10%, illite clay 20%, wollastonite 30%, aluminium sesquioxide 2%.
9, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 40%, zircon 5%, diopside 35%, feldspar 10%, illite clay 10%.
10, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 50%, wollastonite 40%, zircon 8%, illite clay 10%, aluminium sesquioxide 2%.
11, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 60%, wollastonite 30%, zircon 5%, aluminium sesquioxide 5%.
12, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 20%, feldspar 10%, zircon 5%, kaolin 5%, illite clay 25%, aluminium sesquioxide 10%.Zinc oxide 10%, wollastonite 15%.
13, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 30%, zircon 10%, feldspar 10%, aluminium sesquioxide 10%, zinc oxide 5%, illite clay 15%, wollastonite 20%.
14, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 40%, feldspar 20%, illite clay 15%, zircon 5%, diopside 20%.
15, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 50%, illite clay 15%, wollastonite 25%, zircon 5%, zinc oxide 5%.
16, the compound method of glaze of glazed coloured wall or floor tiles according to claim 1 and 2 is characterized in that the cover-coat enamel proportioning is: glass fibre raw silk 60%, illite clay 15%, wollastonite 20%, zircon 5%.
CN 91101273 1991-03-04 1991-03-04 Method for compounding glaze of glazed coloured wall or floor tiles Expired - Fee Related CN1026889C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 91101273 CN1026889C (en) 1991-03-04 1991-03-04 Method for compounding glaze of glazed coloured wall or floor tiles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 91101273 CN1026889C (en) 1991-03-04 1991-03-04 Method for compounding glaze of glazed coloured wall or floor tiles

Publications (2)

Publication Number Publication Date
CN1064465A true CN1064465A (en) 1992-09-16
CN1026889C CN1026889C (en) 1994-12-07

Family

ID=4905013

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 91101273 Expired - Fee Related CN1026889C (en) 1991-03-04 1991-03-04 Method for compounding glaze of glazed coloured wall or floor tiles

Country Status (1)

Country Link
CN (1) CN1026889C (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1039489C (en) * 1993-12-21 1998-08-12 华南理工大学 Process for producing ceramic clinker clew with szaibelyite
CN101838152A (en) * 2009-04-30 2010-09-22 山东圣川陶瓷材料有限公司 Ceramic internal cylinder for dry method cement rotary cement kiln
CN101913910A (en) * 2010-07-30 2010-12-15 湖南醴陵红官窑瓷业有限公司 Multicolor furnace transmutation glaze ground coat and manufacturing method thereof
CN101306955B (en) * 2008-07-03 2011-05-04 醴陵腾瑞工贸有限公司 Method of making cedar glaze
CN102731164A (en) * 2012-06-27 2012-10-17 卡罗比亚釉料(昆山)有限公司 Anti-skid glaze for floor tiles
CN107777884A (en) * 2017-11-15 2018-03-09 金丽梅 A kind of preparation method of purple glaze
CN107793029A (en) * 2017-11-15 2018-03-13 金丽梅 A kind of preparation method of milky white colour glaze
CN107804973A (en) * 2017-11-21 2018-03-16 常州市奥普泰科光电有限公司 A kind of ceramic glaze
CN111285608A (en) * 2020-04-22 2020-06-16 姬存永 Formula and preparation method of zirconium silicate-free wear-resistant glaze
CN113880433A (en) * 2021-09-29 2022-01-04 福建省德化弘展艺品有限公司 Ceramic product prepared by pressureless sintering process

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1039489C (en) * 1993-12-21 1998-08-12 华南理工大学 Process for producing ceramic clinker clew with szaibelyite
CN101306955B (en) * 2008-07-03 2011-05-04 醴陵腾瑞工贸有限公司 Method of making cedar glaze
CN101838152A (en) * 2009-04-30 2010-09-22 山东圣川陶瓷材料有限公司 Ceramic internal cylinder for dry method cement rotary cement kiln
CN101838152B (en) * 2009-04-30 2013-06-26 山东圣川陶瓷材料有限公司 Ceramic internal cylinder for dry method cement rotary cement kiln
CN101913910A (en) * 2010-07-30 2010-12-15 湖南醴陵红官窑瓷业有限公司 Multicolor furnace transmutation glaze ground coat and manufacturing method thereof
CN102731164A (en) * 2012-06-27 2012-10-17 卡罗比亚釉料(昆山)有限公司 Anti-skid glaze for floor tiles
CN102731164B (en) * 2012-06-27 2013-12-25 卡罗比亚釉料(昆山)有限公司 Anti-skid glaze for floor tiles
CN107777884A (en) * 2017-11-15 2018-03-09 金丽梅 A kind of preparation method of purple glaze
CN107793029A (en) * 2017-11-15 2018-03-13 金丽梅 A kind of preparation method of milky white colour glaze
CN107804973A (en) * 2017-11-21 2018-03-16 常州市奥普泰科光电有限公司 A kind of ceramic glaze
CN111285608A (en) * 2020-04-22 2020-06-16 姬存永 Formula and preparation method of zirconium silicate-free wear-resistant glaze
CN113880433A (en) * 2021-09-29 2022-01-04 福建省德化弘展艺品有限公司 Ceramic product prepared by pressureless sintering process

Also Published As

Publication number Publication date
CN1026889C (en) 1994-12-07

Similar Documents

Publication Publication Date Title
CN101012105B (en) Glass fiber with low permittivity
CN1026778C (en) Glass fibres capable of decomposing in physiological medium
AU679536B2 (en) Alkali-resistant glass fibre
CN1064465A (en) The compound method of glaze of glazed coloured wall or floor tiles
ATE248780T1 (en) TRANSLUCENT GLASS CERAMIC, METHOD FOR PRODUCING A TRANSLUCENT GLASS CERAMIC AND THE USE THEREOF
RU2010133664A (en) GLASS THREADS FOR STRENGTHENING ORGANIC AND / OR INORGANIC MATERIALS
GB2046726A (en) Alkali-resistant glass fibres
Chiodelli et al. Ionic conductivity and glass transition of borophosphate glasses
CA2192839A1 (en) Glass compositions and fibers therefrom
DE2808647A1 (en) ALUMINUM BOROPHOSPHATE GLASS COMPOSITIONS
US2741008A (en) Method of producing glazed ceramic objects
Kuno Pigeonite-bearing andesite and associated dacite from Asio, Japan
JP2002179435A (en) Glass, ceramic color composition and glass sheet with ceramic color layer
CN1200898C (en) Leadfree lanthanum-contained crown glass and lanthanum-contained flint glass
CN87108257A (en) Method for making alkali-resisting glass fiber
US7073353B2 (en) Production of mineral wool
DE3679092D1 (en) ALKALI-RESISTANT GLASS FIBERS AND THEIR USE FOR CEMENT REINFORCEMENT.
CN101935163B (en) Glass tube of novel high-efficiency energy-saving lamp
CN1259268C (en) Preparation method of low ultraviolet absorption multipore and poreless high silica glass
CN1023698C (en) Formula for making porcelain glaze with Ti-containing slag
WO1985002395A1 (en) Boria modified alkaline-resistant glass
CN101054306A (en) Crystallite foaming structure ceramic composition and preparation method thereof
CN1063854A (en) A kind of novel glass fiber and manufacture method thereof
CN1028089C (en) Powdered coal ash water soaking bricks and its production method
SU1546444A1 (en) Enamel for steel

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee