CN106946464A - One kind, which has, carries high performance alkali-free glass fibre and preparation method thereof - Google Patents
One kind, which has, carries high performance alkali-free glass fibre and preparation method thereof Download PDFInfo
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- CN106946464A CN106946464A CN201710156604.9A CN201710156604A CN106946464A CN 106946464 A CN106946464 A CN 106946464A CN 201710156604 A CN201710156604 A CN 201710156604A CN 106946464 A CN106946464 A CN 106946464A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C13/00—Fibre or filament compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
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Abstract
Have the present invention relates to one kind and carry high performance alkali-free glass fibre and preparation method thereof, described have that to carry the chemical component weight percentage of high performance alkali-free glass fibre be SiO2:56‑57.5%；B2O3：3‑4.5%；Al2O3:13.5‑15%；CaO：19‑20.5%；MgO：2.8‑3.5%；R2O=K2O+Na2O：0.8‑1.1%；TiO2:0.2 0.6%, surplus is Fe2O3+ZnO+ZrO2+Cr2O3, it is 100% that each composition by weight percent sum is met during proportioning；And sequentially pass through that raw material is prepared, founded, wire drawing, doff, impregnation, drying and detection are prepared into high performance alkali-free glass fibre is carried.The advantage of the invention is that：The present invention passes through the adjustment to each component in formula, reduce the pollution that boron volatilization is caused, beneficial to environmental protection, while having saved resource, considerably reduce the manufacturing cost of powder, and the synergy by each component and the strict control to each component content, make the alkali-free glass fibre performance of preparation more preferably.
Description
Technical field
The invention belongs to new material technology field, more particularly to one kind, which has, carries high performance alkali-free
Glass fibre and preparation method thereof.
Background technology
Glass fibre is a kind of Inorganic Non-metallic Materials of excellent performance.English original name is：Glass fiber or
fiberglass.Composition is silica, aluminum oxide, calcium oxide, boron oxide, magnesia, sodium oxide molybdena etc..It is with glass marble or
Discarded glass is raw material through techniques such as high temperature melting, wire drawing, doff, impregnations.Various product is eventually formed, glass fiber single filament
Diameter is from several microns to twenties meters microns, equivalent to the 1/20-1/5 of a hairline, has number per bundle fiber precursor
Hundred even thousands of monofilament compositions, usually as the reinforcing material in multiple material, electrically insulating material and heat-insulating material, electricity
Base board etc., is widely used in national economy every field.Alkali-free glass fibre R2O content is less than 0.8%, is a kind of aluminium borosilicate
Hydrochlorate composition.Its chemical stability, electrical insulation capability, intensity are all fine.It is mainly used as the enhancing of electrically insulating material, fiberglass
Material and tire cord.
Through retrieval, existing document discloses a kind of alkali-free glass fibre, and it is made up of following components in parts by weight： SiO2:
55.2%；B2O3：7.3%；Al2O3:14.8%；CaO：18.4%；MgO：3.2%；R2O=K2O+Na2O：0.5%；F 2:0.3%, Fe2O3:
0.3%, the advantage of the alkali-free glass fibre prepared by the formula is good mechanical property, and tensile strength of fiber reaches 2200-
2350MPa, tensile modulus of elasticity reach 72-73MPa, and resistance to sintering temperature is up to 600-650 DEG C, but the alkali-free glass fibre by
The content of boron is of a relatively high in formula, and substantial amounts of boron is had in melting process and is thrown into air, boron pollution is caused, destruction
Natural environment, and cause the waste of resource；Meanwhile, the cost of boracic raw material in the alkali-free glass fibre cost of material of the formula
Accounting is higher, makes tonnage cost of material very high.
The content of the invention
Have the technical problem to be solved in the present invention is to provide one kind and carry high performance alkali-free glass fibre and its preparation side
Method, by the adjustment to each component in formula, and then reduces boron pollution, beneficial to environmental protection, meanwhile, resource has been saved, has been reduced
Cost；In addition, the synergy by each component and the strict control to each component content, make the alkali-free glass fibre of preparation
Can be more preferably.
In order to solve the above technical problems, the technical scheme is that：One kind, which has, carries high performance alkali-free glass fibre,
Its innovative point is：It is described have carry high performance alkali-free glass fibre chemical component weight percentage be SiO2:56-
57.5%；B2O3：3-4.5%；Al2O3:13.5-15%；CaO：19-20.5%；MgO：2.8-3.5%；R2O=K2O+Na2O：0.8-
1.1%；TiO2:0.2-0.6%, surplus is Fe2O3+ZnO+ZrO2+Cr2O3, each composition by weight percent sum is met during proportioning is
100%。
It is a kind of it is above-mentioned there is the preparation method for carrying high performance alkali-free glass fibre, comprise the following steps：Raw material preparation,
Found, wire drawing, doff, impregnation, drying, detection, its innovative point is：Above-mentioned found uses unit kiln, and natural gas is fuel, pure
The mode of oxygen burning is founded, and uses " mountain type " glass melting temperature system, and hot(test)-spot temperature is 1420-1450 DEG C, flame space
1530-1550 DEG C of maximum temperature, founds area's temperature for 1380-1400 DEG C, founds two area's temperature for 1390-1410 DEG C, founds
Three area's temperature are 1420-1450 DEG C, found four area's temperature for 1400-1420 DEG C, and bottom of pond uses general power for 850-900KW's
Electric boosting promotes founding and being homogenized for glass metal, meanwhile, the bubbling device that bottom of pond is set makes path temperature of glass liquid in 1260-
1280 DEG C, 1180-1260 DEG C of nozzle plate temperature.
Further, the raw material that the raw material preparation steps are chosen is pyrophyllite, albite, dolomite, lime stone, boron calcium
Stone, high territory, saltcake, fluorite and titanium dioxide.
Having for technical solution of the present invention is carried in high performance alkali-free glass fibre, formula, SiO2It is to form glass skeleton
Main oxides, and play stable each component, in the having and carry high performance alkali-free glass fibre of the present invention, limit
Determine SiO2Weight percentage ranges be 56-57.5wt%, ensure mechanical performance on the basis of, in order to not increase glass smelting
Specially silica content is controlled in not bery high level with clarifying in difficulty, the present invention, compared with existing alkali-free glass fibre,
Increase.
B2O3With SiO2Composition in glass network structure again it is constitute the composition of its skeleton, but not as SiO2Composition
Increase the high temperature viscometrics of melten glass like that, on the contrary with the effect for declining high temperature viscometrics, advantageously reduce glass smelting
Temperature and the material for adjusting glass；But it is of the invention by B2O3Weight percentage ranges be strict controlled in 3-4.5wt%, B2O3Introduce
Amount is unsuitable more, when content is excessive, in melting process, the waste for not only causing a large amount of boron to volatilize, and causes the boron pollution of air,
It is unfavorable for environmental protection.
Al2O3It is also the oxide to form glass skeleton, with SiO2With reference to when can play substance to the mechanical performance of glass
Effect, and played an important role in terms of glass phase-separating and water-resistance is prevented, and carry high performance in having for the present invention
In alkali-free glass fibre, Al is limited2O3Weight percentage ranges be 13.5-15wt%, can not obtain foot if its content is relatively low
Enough high mechanical performances, especially modulus；If the too high risk that glass phase-separating is easily significantly increased of its content.
CaO is the network modifying oxide of glass, can both adjust glass viscosity, control devitrification of glass, can also improve
The chemical stability and mechanical strength of glass, the CaO weight percentage ranges that the present invention is limited is 19-20.5wt%, if it contains
The too low above-mentioned effect of amount is not notable, if its too high levels, can increase the tendency towards devitrification of glass, cause to separate out brightness from glass
The danger of the crystal such as stone, wollastonite.
MgO belongs to the outer component of network, can effectively reduce the high temperature viscosity of glass, certain benefit has been founded to glass,
The present invention limits MgO weight percentage ranges as 2.8-3.5wt%, if its content is too high, can promote the crystallization of glass, improves
The recrystallization temperature of glass, if its content is too low, it is difficult to play due effect.
TiO is introduced in technical solution of the present invention2, not only with fluxing action, moreover it is possible to significantly improve the height of glass fibre
Elastic modelling quantity and the compactness for improving glass network structure, but due to TiO2Middle Ti4+It can excessively make glass generation inappropriate
Color, and cost is higher, introduction volume should not be excessive, therefore the present invention is strictly by TiO2Weight percentage ranges are controlled in 0.2-
0.6wt%。
And K is also introduced in technical solution of the present invention2O and Na2O, K2O and Na2O can reduce glass viscosity, be good
Cosolvent, but both introduction volumes are unsuitable more, and therefore, the present invention is by the percentage composition control of both summations in 0.8-
1.1wt%, to avoid the intensity and chemical stability that reduce glass.
But in actual production process, can also there is Fe2O3、ZnO、ZrO2And Cr2O3, although these impurity are to glass combination
There is certain influence in the performance of thing, but also have certain facilitation simultaneously.
The advantage of the invention is that：
（1）The present invention, which has, carries high performance alkali-free glass fibre, compared with existing alkali-free glass fibre, by introducing TiO2's
Consumption, relative changes SiO2, CaO and B2O3Consumption, reasonable control impurity F e2O3、ZnO、ZrO2And Cr2O3Consumption；To obtain
Requirement in cost and environmentally must be met and the elastic modelling quantity and sintering resistance energy of glass fibre can be improved, be i.e. present invention tool
The alkali-free glass fibre for being improved performance prepares cost compared with existing alkali-free glass fibre prepares cost, it is possible to decrease 10-20%,
Sintering resistance can improve 20~40 DEG C simultaneously, and elastic modelling quantity can improve 5~6GPa；
（2）The present invention, which has, carries high performance alkali-free glass fibre, compared with existing alkali-free glass fibre, by rationally controlling
R2O consumption, meets the requirement of fiber fusion and clarification, and introduce R with raw mineral materials albite2O, it is to avoid industrial chemicals draws
Enter R2The high situation of O costs；Meanwhile, the alternative part pyrophillite of albite introduces a certain amount of SiO2And Al2O3, it is former
Expect that cost ratio introduces SiO using pyrophillite2And Al2O3Advantageously.
（3）The present invention has the preparation method for carrying high performance alkali-free glass fibre, wherein, selected by raw material preparation
Raw material, although material composition is complicated, but the presence of many kinds of substance restrained effectively the crystallization of glass, can be prepared by the material list
Go out the glass of respective components；In addition, the strictly temperature in control melting process, and enter trip temperature zonal control, can meet cellar for storing things
The need for interior diverse location glass fluid fusing, clarification and homogenization.
Embodiment
The following examples can make professional and technical personnel that the present invention is more fully understood, but therefore not send out this
It is bright to be limited among described scope of embodiments.
Embodiment 1
The present embodiment, which has, to be put forward the component and percentage by weight of high performance alkali-free glass fibre and is：SiO2:56%；B2O3：4.5%；
Al2O3: 15%；CaO：19%；MgO：3.5%；R2O=K2O+Na2O：0.8%；TiO2:0.2% and Fe2O3+ZnO+ZrO2+Cr2O3：1%.
Said components have carry high performance alkali-free glass fibre be with made from following technique, it is specific as follows：
（1）Raw material is prepared：Take pyrophyllite 57.41g, albite 4.04g, dolomite 15.07g, lime stone 19.67g, bechilite
12.33g, high territory 14.47g and saltcake 0.25g, above-mentioned raw materials are well mixed, uniformity >=95%, the formula with it is above-mentioned
Composition and content are consistent.
Although the complicated component of raw material, corresponding regulation has all been done to raw materials used main component and impurity content,
The glass of said components can be prepared by above-mentioned material list.
（2）Found：The raw material prepared is added into unit kiln, using natural gas as fuel, the mode of pure oxygen burning is founded,
And founded using " mountain type " temperature, hot(test)-spot temperature is 1420-1450 DEG C, and 1530-1550 DEG C of flame space maximum temperature founds one
Area's temperature is 1380-1400 DEG C, founds two area's temperature for 1390-1410 DEG C, founds three area's temperature for 1420-1450 DEG C, founds
Four area's temperature be 1400-1420 DEG C, and bottom of pond use general power be 850-900KW electric boosting promotion glass metal found with
Change, meanwhile, the bubbling device that bottom of pond is set makes the bubble produced by being reacted in high-temperature glass liquid exclude as far as possible, to wire drawing
Shaping provides stable glass metal.Make path temperature of glass liquid at 1260-1280 DEG C, 1180-1260 DEG C of nozzle plate temperature meets fine
The need for dimension shaping.
（3）Wire drawing：The high-temperature liquid state glass clarified flows through porous bushing（1250℃）Outflow, and by high speed traction into elder generation
The alkali-free glass fibre entered（AE glass fibres）.When fiber forms AE glass fibres below bushing by traction, it is necessary to right
Filament root imposes pressure cooling provision, allows the fiber of high-temperature liquid state quickly to cross devitrification of glass humidity province to room temperature formation glass
Fiber.The temperature that AE glass separates out crystal is 1130 DEG C, and the density of AE glass is 2.55g/cm3。
（4）After wire drawing terminates, carry out doff, impregnation, impregnation beam yarn, drying, detection fibre strength and modulus are made, from examination
Impregnation yarn test tensile strength and elastic modelling quantity are removed in sample rack.
The test result of embodiment 1 and prior art is contrasted：
Test result and alkali-free glass fibre in background technology in the alkali-free glass fibre as made from the component and technique of embodiment 1
Compare, data are as follows：
| Composition | Background technology（%） | Embodiment 1（%） |
| SiO2 | 55.2 | 56 |
| B2O3 | 7.3 | 4.5 |
| Al2O3 | 14.8 | 15 |
| CaO | 18.4 | 19 |
| MgO | 3.2 | 3.5 |
| R2O=K2O+Na2O | 0.5 | 0.8 |
| TiO2 | / | 0.2 |
| Fe2O3+ZnO+ZrO2+Cr2O3 | / | 1 |
| Fe2O3 | 0.3 | / |
| Prepare cost（Yuan/ton） | 1176 | 1030 |
| Liquidus temperature（℃） | 1140 | 1125 |
| Density（g/cm3） | 2.53 | 2.55 |
| Elastic modelling quantity（GPa） | 72 | 78 |
| Tensile strength（MPa） | 2270 | 2290 |
| Softening point（℃） | 835 | 859 |
As can be seen from the above table, in the implementation case, adjusted by the proportioning of glass ingredient, the cost of material of glass fibre declines
12.5%；The difference of the forming temperature of fiber and the liquidus temperature of glass is set to increase 15 DEG C so that drawing process is more stable；It is fine
The elastic modelling quantity of dimension improves 6GPa, the fragility of fiber is made moderate progress；The tensile strength of fiber is basically identical；The softening of glass
Point improves 24 DEG C, and the sintering resistance that mesh sheet finished product is made is improved.
Embodiment 2
Technique is same as Example 1, and the present embodiment, which has, to be put forward the component and percentage by weight of high performance alkali-free glass fibre and be：
SiO2:56.5%；B2O3：3.5%；Al2O3: 14.5%；CaO：20%；MgO： 3.0%；R2O=K2O+Na2O：1.0%；TiO2:0.5%
And Fe2O3+ZnO+ZrO2+Cr2O3：1%.
Material prescription correspondingly is as follows：Pyrophyllite 58.28g；Albite 5.75g；Dolomite 12.86g；Lime stone
24.08g；Bechilite 9.59g；High territory 11.76g；Saltcake 0.3g；Fluorite 0.16g and titanium dioxide 0.13g.
The test result of embodiment 2 and prior art is contrasted：
Test result and alkali-free glass fibre in background technology in the alkali-free glass fibre as made from the component and technique of embodiment 2
Compare, data are as follows：
| Composition | Background technology（%） | Embodiment 2（%） |
| SiO2 | 55.2 | 56.5 |
| B2O3 | 7.3 | 3.5 |
| Al2O3 | 14.8 | 14.5 |
| CaO | 18.4 | 20 |
| MgO | 3.2 | 3 |
| R2O=K2O+Na2O | 0.5 | 1.0 |
| TiO2 | / | 0.5 |
| Fe2O3+ZnO+ZrO2+Cr2O3 | / | 1 |
| Fe2O3 | 0.3 | / |
| Prepare cost（Yuan/ton） | 1176 | 970 |
| Liquidus temperature（℃） | 1140 | 1132 |
| Density（g/cm3） | 2.53 | 2.54 |
| Elastic modelling quantity（GPa） | 72 | 78.4 |
| Tensile strength（MPa） | 2270 | 2310 |
| Softening point（℃） | 835 | 864 |
As can be seen from the above table, in the implementation case, adjusted by the proportioning of glass ingredient, the cost of material of glass fibre declines
18.5%；The difference of the forming temperature of fiber and the liquidus temperature of glass is increased 8 DEG C, disclosure satisfy that fiber draw process is steady
It is fixed；The elastic modelling quantity of fiber improves 6.4GPa, the fragility of fiber is made moderate progress；The tensile strength of fiber is slightly higher；Glass
Softening point improves 29 DEG C, and the sintering resistance that mesh sheet finished product is made is improved.
Embodiment 3
Technique is same as Example 1, and the present embodiment, which has, to be put forward the component and percentage by weight of high performance alkali-free glass fibre and be：
SiO2:57.5%；B2O3：3%；Al2O3: 13.5%；CaO：20.5%；MgO： 2.8%；R2O=K2O+Na2O：1.1%；TiO2:0.6%
And Fe2O3+ZnO+ZrO2+Cr2O3：1%.
Material prescription correspondingly is as follows：Pyrophyllite 61.26g；Albite 7.24g；Dolomite 11.99g；Lime stone
26.09g；Bechilite 8.35g；High territory 6.81g；Saltcake 0.4g；Fluorite 0.25g and titanium dioxide 0.25g.
The test result of embodiment 3 and prior art is contrasted：
Test result and alkali-free glass fibre in background technology in the alkali-free glass fibre as made from the component and technique of embodiment 3
Compare, data are as follows：
| Composition | Background technology（%） | Embodiment 3（%） |
| SiO2 | 55.2 | 57.5 |
| B2O3 | 7.3 | 3 |
| Al2O3 | 14.8 | 13.5 |
| CaO | 18.4 | 20.5 |
| MgO | 3.2 | 2.8 |
| R2O=K2O+Na2O | 0.5 | 1.1 |
| TiO2 | / | 0.6 |
| Fe2O3+ZnO+ZrO2+Cr2O3 | / | 1 |
| Fe2O3 | 0.3 | / |
| Prepare cost（Yuan/ton） | 1176 | 940 |
| Liquidus temperature（℃） | 1140 | 1135 |
| Density（g/cm3） | 2.53 | 2.54 |
| Elastic modelling quantity（GPa） | 72 | 78.8 |
| Tensile strength（MPa） | 2270 | 2340 |
| Softening point（℃） | 835 | 862 |
As can be seen from the above table, in the implementation case, adjusted by the proportioning of glass ingredient, the cost of material of glass fibre declines
20%；Make liquidus temperature the and existing alkali-free liquidus temperature of glass basically identical, disclosure satisfy that fiber draw stable molding
Need；The elastic modelling quantity of fiber improves 6.8GPa, the fragility of fiber is made moderate progress；The tensile strength of fiber is slightly higher；Glass
Softening point improve 27 DEG C, be made mesh sheet finished product sintering resistance improve.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The skill of the industry
Art personnel are it should be appreciated that the present invention is not limited to the above embodiments, and described in above-described embodiment and specification is explanation
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and
Its equivalent thereof.
Claims (3)
1. one kind, which has, carries high performance alkali-free glass fibre, it is characterised in that：It is described fine with high performance alkali-free glass is carried
The chemical component weight percentage of dimension is SiO2:56-57.5%；B2O3：3-4.5%；Al2O3:13.5-15%；CaO：19-20.5%；
MgO：2.8-3.5%；R2O=K2O+Na2O：0.8-1.1%；TiO2:0.2-0.6%, surplus is Fe2O3+ZnO+ZrO2+Cr2O3, proportioning
When meet each composition by weight percent sum for 100%.
2. there is the preparation method for carrying high performance alkali-free glass fibre described in a kind of claim 1, comprise the following steps：It is former
Material prepare, found, wire drawing, doff, impregnation, drying, detection, it is characterised in that：Above-mentioned found uses unit kiln, and natural gas is combustion
Material, the mode of pure oxygen burning is founded, and uses " mountain type " glass melting temperature system, and hot(test)-spot temperature is 1420-1450 DEG C, flame
1530-1550 DEG C of space maximum temperature, founds area's temperature for 1380-1400 DEG C, founds two area's temperature for 1390-1410 DEG C,
Three area's temperature are founded for 1420-1450 DEG C, four area's temperature are founded for 1400-1420 DEG C, and bottom of pond uses general power for 850-
900KW electric boosting promotes founding and being homogenized for glass metal, meanwhile, the bubbling device that bottom of pond is set makes path temperature of glass liquid
In 1260-1280 DEG C, 1180-1260 DEG C of nozzle plate temperature.
3. according to claim 2 have the preparation method for carrying high performance alkali-free glass fibre, it is characterised in that：It is described
Raw material preparation steps choose raw material for pyrophyllite, albite, dolomite, lime stone, bechilite, high territory, saltcake, fluorite and
Titanium dioxide.
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| CN110106580A (en) * | 2019-04-30 | 2019-08-09 | 巢湖市翔宇渔具有限公司 | A kind of processing method of corrosion-resistant luminous fishing net |
| CN110395912A (en) * | 2019-08-27 | 2019-11-01 | 清远忠信世纪玻纤有限公司 | A kind of low-k electronic-grade glass and preparation method thereof |
| CN111533442A (en) * | 2020-06-15 | 2020-08-14 | 泰安顺茂新材料技术有限公司 | Corrosion-resistant glass composition and preparation method thereof |
| CN112046031A (en) * | 2020-08-05 | 2020-12-08 | 赵军 | Luminous technology for glass fiber reinforced plastic sculpture |
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| CN110395912A (en) * | 2019-08-27 | 2019-11-01 | 清远忠信世纪玻纤有限公司 | A kind of low-k electronic-grade glass and preparation method thereof |
| CN111533442A (en) * | 2020-06-15 | 2020-08-14 | 泰安顺茂新材料技术有限公司 | Corrosion-resistant glass composition and preparation method thereof |
| CN112046031A (en) * | 2020-08-05 | 2020-12-08 | 赵军 | Luminous technology for glass fiber reinforced plastic sculpture |
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