CN111977983B - Glass composition having excellent alkali resistance and yarn for textile - Google Patents

Glass composition having excellent alkali resistance and yarn for textile Download PDF

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CN111977983B
CN111977983B CN202010915431.6A CN202010915431A CN111977983B CN 111977983 B CN111977983 B CN 111977983B CN 202010915431 A CN202010915431 A CN 202010915431A CN 111977983 B CN111977983 B CN 111977983B
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glass
yarn
alkali resistance
glass composition
mgo
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CN111977983A (en
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唐志尧
李永艳
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Taishan Fiberglass Inc
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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
    • C03C13/001—Alkali-resistant fibres
    • C03C13/002—Alkali-resistant fibres containing zirconium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
    • 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
    • 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
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/42—Glass

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Glass Compositions (AREA)

Abstract

The invention belongs to the technical field of glass fiber, and particularly relates to a glass composition with good alkali resistance and yarn for fabric. The composition comprises the following components in percentage by weight: SiO 22：60.0‑72.0wt.％，CaO：7.0‑14.0wt.％，MgO：5.0‑8.0wt.％，Al2O3：0‑5.0wt.％，TiO2：0‑3.0wt.％，Fe2O3：0‑1.0wt.％，R2O：8.0‑11.0wt.％，ZrO2: 0.5-5.0wt.%, R2O is Na2O+K2O and the balance of impurities. The yarn for fabrics prepared from the glass composition has good alkali resistance, high mechanical strength, less hairiness of finished products and lower cost, and can be used for producing general outer wall gridding cloth or other composite material matrixes with high alkali resistance.

Description

Glass composition having excellent alkali resistance and yarn for textile
Technical Field
The invention belongs to the technical field of glass fibers, and particularly relates to a glass composition with good alkali resistance and a yarn for fabrics.
Background
The glass fiber is an inorganic non-metallic material with the largest use amount and the widest application range in the composite material reinforced base material, and has wide application in the fields of new energy, traffic, industry, construction, environment and the like. With the rapid development of glass fibers, especially the requirements in the field of glass fibers with high alkali resistance, aging resistance and the like are continuously increased, and ordinary medium-alkali glass fibers and alkali-free glass fibers cannot meet the market demands. In order to improve the alkali resistance of the glass fiber, high-zirconium alkali-resistant glass fiber has been successfully developed, which has better alkali resistance, and the common ZrO in the alkali-resistant fiber2Not less than 14.5 percent, and ZrO is introduced2The raw material of the alkali-resistant glass is zircon powder, and the required raw material of the zircon powder is expensive, so that the alkali-resistant glass has high cost and relatively poor mechanical property. Therefore, there is a need in the art to develop a glass fiber with high alkali resistance and low cost.
Chinese patent CN102050572A discloses a boron-free neutral glass, which comprises the following components in percentage by mass: 65-72% SiO2、11-17％Al2O3、0.1-8％Na2O, 3-8% MgO, 4-12% CaO and 0-10% ZnO, the neutral glass having a first type of hydrolysis resistance according to DIN ISO719, and a second type of acid resistance according to DIN12116 and a second type of alkali resistance according to DIN ISO 695. The glass component is only suitable for the production of neutral glass, and the production process of the neutral glass and the manufacturing process of glass fiber are finishedAll differently, this component is not suitable for the production of continuous glass fibers.
Chinese patent CN103787593A discloses a method for preparing alkali-resistant glass fiber, which is mainly to remove the wetting agent on the surface of the glass fiber by baking, then to perform surface treatment on the glass fiber, and to obtain alkali-resistant glass fiber by post-treatment. The patent does not provide the alkali resistant glass fiber composition.
Chinese patent CN102390934A discloses a glass fiber composition, which comprises the following components of 58-67 percent of SiO by mass percentage2、6-12％Al2O3、10-14.5％CaO、MgO≤4％、MgO+SrO+BaO:1-6.0％、Na2O＜12％、K2O＜2.0％，Na2O+Na2O＞8.0％，Fe2O3:0.1-1.5％、TiO2:0.1-2％，F20 to 1 percent. The technical problem mainly solved by the patent is to improve the water resistance of the glass fiber, and the glass fiber cannot be applied to a composite material matrix with special requirements on alkali resistance.
Chinese patent CN105753330A discloses an alkali-resistant glass fiber composition, alkali-resistant glass fibers and a preparation method of the alkali-resistant glass fibers. The glass fiber composition contains the following components: SiO 22 50-65％，CaO 10-24％，Al2O3 0.5-14％，MgO 2-7％，Na2O+K2O 0-15％，ZrO2 0-15％，TiO20.1-0.9%, iron oxide 0.1-0.5%, and other 0-0.5%, wherein "0" means that the content is infinitely close to 0 but not 0.
Chinese patent CN105800943A discloses a glass fiber composition using red mud and blast furnace slag as raw materials, alkali-resistant glass fiber and a preparation method of the alkali-resistant glass fiber. The glass fiber composition contains the following components: SiO 22 48-62％、CaO 5-20％、Al2O3 6-18％、MgO 0.2-6％、ZrO2 0-14.5％、Li2O+Na2O+K2O 0.5-6.5％、TiO20.01-2%, iron oxide 5-15%, and others 0-0.5%.
The technical problems solved by the two patents are that solid wastes are effectively recycled.
Chinese patent CN104261686A discloses an alkali-resistant glass fiber composition, which comprises the following components in percentage by weight: SiO 22 59.0-63.0％，ZrO2 14.5-16.5％，CaO 4.0-5.5％，R2O＝Li2O+Na2O+K2O 14.9-17.0％，Fe2O3 0-1.0％，TiO20 to 0.5 percent; wherein, K is2The weight percentage of O is 0.1-1.4%, and the Li2The weight percentage content of O is 0.1-1.0%, and the ratio C1 ═ Li2O+Na2O+K2O)/ZrO2Is 0.89-1.05. The alkali-resistant glass fiber composition of the patent has a high zirconium content, which increases the cost.
Disclosure of Invention
The invention aims to provide a glass composition with good alkali resistance; the invention also provides the yarn for the fabric, which has the advantages of good alkali resistance, high mechanical strength, less hairiness of a finished product and lower cost.
The glass composition with good alkali resistance comprises the following components in percentage by mass: SiO 22：60.0-72.0wt.％，CaO：7.0-14.0wt.％，MgO：5.0-8.0wt.％，Al2O3：0-5.0wt.％，TiO2：0-3.0wt.％，Fe2O3：0-1.0wt.％，R2O：8.0-11.0wt.％，ZrO2：0.5-5.0wt.％，R2O is Na2O+K2O and the balance of impurities.
Wherein:
preferably, the glass composition with good alkali resistance of the present invention comprises the following components by mass percent: SiO 22：68.0-71.0wt.％，CaO：8.0-12.0wt.％，MgO：5.0-8.0wt.％，Al2O3：0-5.0wt.％，TiO2：0-3.0wt.％，Fe2O3：0-1.0wt.％，Na2O：8.0-10.5wt.％，K2O：0-1.0wt.％，ZrO2: 0.5-5.0wt.%, with the balance being impurities.
MgO and Na2Mass percent of OMgO/Na2O is 0.5 to 0.9; the mass percentage of MgO to CaO is 0.5-1.0.
The fiber forming temperature of the glass composition is 1200-1300 ℃, and the liquidus temperature is 1100-1250 ℃.
The difference delta T between the fiber forming temperature and the liquidus temperature is 50-120 ℃, has good fiber forming process requirements, and can be continuously produced in large scale so as to meet market requirements.
The glass composition with good alkali resistance of the invention does not contain LiO2Fluorine-free, boron-free.
The glass composition with good alkali resistance is prepared from the following raw materials: coal series kaolin, quartz powder, quicklime, magnesium oxide, albite, anhydrous sodium sulphate and zircon powder; the raw materials are common and the cost is low. Wherein: the average grain diameters of the coal-series kaolin, the quartz powder, the quicklime, the magnesia, the albite, the anhydrous sodium sulphate and the zircon powder are all 100-plus-200 mu m.
The yarn for the fabric prepared from the composition disclosed by the invention is prepared by the following steps:
(1) weighing the raw materials of the glass composition according to the proportion and mixing the raw materials to obtain a uniform batch;
(2) melting the batch to obtain glass liquid;
(3) drawing the glass liquid into fibers through a 1200-hole bushing, cooling the monofilaments through spraying, coating impregnating compound through an oiling device, preparing spinning cakes, conditioning and preparing the yarns for the fabrics.
Wherein:
the melting temperature is 1450-1500 ℃, and the bushing temperature is 1150-1250 ℃.
The conditioning temperature is 28-30 ℃, and the conditioning time is 16-18 h; the humidity during conditioning is 65-70%.
The application of the sizing and the conditioning steps are carried out according to the usual procedures of a person skilled in the art, the sizing being a commercially available product.
The hairiness amount of the fabric yarn with good alkali resistance is small, the single yarn hairiness amount of the fabric yarn is less than or equal to 1, the SIC test strength is kept above 500MPa, the fabric yarn is made into the mesh fabric, and the alkali resistance tensile breaking strength retention rate of the mesh fabric can reach above 80%.
The textile yarn prepared from the composition can be used for producing general outer wall gridding cloth or other composite material matrixes with high alkali resistance.
The invention has the following beneficial effects:
SiO2is an acidic oxide and is easy to react with NaOH to generate sodium silicate and SiO2Also a glass network former, which is the main component forming the glass, SiO2The mechanical properties of the glass fibers with too low a content are poor, SiO2The forming temperature of the glass with too high content is higher, and in order to give consideration to the good mechanical strength of the glass and the forming temperature of the fiber which allows the requirements of the tank furnace melting process, the SiO of the invention2The content is controlled to 60.0-72.0 wt.%, and SiO is further preferred2The content is 68.0-71.0 wt.%.
The alkaline earth metal oxide (RO) belongs to the external oxide of the network, CaO and MgO alkaline earth metals are selected from the glass components, BaO and SrO are not introduced, and the CaO and MgO mineral raw materials have wide sources and lower cost. The divalent alkaline earth metal basically follows the ionic radius size rule, when the amount of different ions reaches a certain proportion, the optimal stacking can be obtained, and the connection between the ions and the silica framework is firmer, which is also the reason for generating the mixed alkali effect. In the system, the content of MgO is increased, the alkali resistance of the glass can be obviously improved, the MgO can effectively reduce the high-temperature viscosity of the glass and is beneficial to melting the glass, but the crystallization of the glass can be promoted by too high MgO introduction amount, when the content of the MgO is lower than 5.0wt.%, the alkali resistance of the glass is not obviously improved, and when the content of the MgO is higher than 8.0 wt.%, the glass has higher crystallization tendency, so the content of the MgO is controlled to be 5.0-8.0 wt.%. The alkali resistance of MgO is improved more than that of CaO, and when the weight ratio of MgO/CaO is 0.5-1.0, the alkali resistance of the glass is better. CaO can reduce the forming temperature, but the content of CaO is too high, so that the Delta T value becomes small and can not meet the process requirement, and the content of CaO in the invention is controlled to be 7.0-14.0 wt.%, and the content of CaO is further preferably 8.0-12.0 wt.%.
Na2O has good alkali resistance, but is used as a network exo-oxide, Na2The addition of O will disconnect the networkCracking, lowering the strength and chemical stability of the glass; with Na2The increase in O content is good in alkali resistance but poor in water resistance. Na in glass2When the O content is in a certain range, it can form uniform structural component in network, and can make glass formed range be enlarged, and can make the formed glass more stable, and in the system of said invention the MgO/Na component can be used as2When the weight ratio of O is 0.5-0.9, the alkali resistance is better, and in order to ensure that each performance data is stable, the Na of the invention2The O content is controlled to be 8.0-10.5 wt.%.
In order to ensure low cost, preferably, albite and other raw materials are used, and a certain amount of K is introduced into the raw materials2O content, K2O+Na2The content of O is 8.0-11.0 wt.%, preferably K2The O content is 0.0-1.0 wt.%. Li2The cost of the O raw material is high, the advantage of alkali resistance is not obvious, and the invention is not specially introduced.
ZrO2When eroded by alkali solutions, ZrO2Zirconium enrichment can occur, a layer of protective film is formed on the surface, the protective film can effectively protect the continuous dissolution of other components, the alkali resistance of the glass can be effectively improved, and when the content of other components is unreasonable, a proper amount of ZrO is added2The alkali resistance desired in the present invention cannot be achieved. ZrO (ZrO)2The excessive use amount can obviously improve the melting temperature of the glass, increase the devitrification, increase the operation difficulty of the fiber in production, and introduce ZrO2The raw material of the high-temperature-resistant zirconia powder is zircon powder, and the price is high. The invention adds ZrO in 0.5-5.0 wt%2The alkali resistance can be improved, the melting temperature can be ensured, and the glass cost can not be increased too much.
TiO2The enthalpy of dissolution in alkali liquor is larger, which is beneficial to improving the alkali resistance of glass, but titanium is also a coloring element, which affects the color of glass products, the price of raw materials is higher, and the titanium can be introduced properly according to the requirements, the TiO of the invention2The content is controlled at 0-3 wt.%.
Al2O3Less enthalpy of dissolution in the lye, instability in the lye, Al2O3And amphoteric oxide, and can react with both alkali and acid, so Al2O3The content is in the bookThe invention is not very large, and part of Al is added into the glass composition2O3The difference between the fiber forming temperature and the liquidus temperature can be optimized, and the devitrification tendency of the glass can be reduced. Al (Al)2O3When the content exceeds 5.0 wt%, the crystallization tendency is obviously increased, and in order to ensure that the glass fiber has higher alkali resistance and also give consideration to the process properties of glass forming, fiber forming and the like, the Al-based glass fiber has the advantages of high glass fiber strength, high glass forming property, high glass fiber strength and the like2O3The content is controlled at 0-5.0 wt.%.
Fe2O3Is a coloring element, has great influence on the heat transfer performance of glass color and glass, and the heat transmission performance of the glass can be influenced when the content is too high. In order to make the glass have good appearance, reduce the operation difficulty of the product in production and ensure the whiteness of the product, the invention provides Fe2O3The content is less than or equal to 1.0 wt.%.
The invention controls Al2O3Adjusting CaO, MgO and Na while adjusting the content2The alkali resistance of the glass can be effectively improved only by properly adding zirconium and titanium according to the use proportion of the components O, and the alkali resistance of the glass cannot be obtained by singly adding a certain element or introducing the element in an improper proportion.
By optimizing the components, the glass fiber composition has the advantages of higher alkali resistance, lower liquidus temperature and fiber forming temperature, good process performance and relatively low energy consumption, and can be suitable for drawing refractory material in a tank furnace.
The yarn for the fabric prepared by the invention has less hairiness, the hairiness is an important quality index of the glass fiber, is greatly influenced by a formula system, has less hairiness, and is beneficial to the use of the subsequent procedures of grid cloth and the like.
The yarn for the fabric can be used for preparing a gridding cloth fabric, and the production of the gridding cloth fabric comprises three processes of warping, weaving and coating. If the amount of the used yarn hairiness is large, yarn breakage is easily caused, and the production efficiency is influenced. The fabric has the advantages of less yarn hairiness, less broken yarn, easy warping, high production efficiency, less woven grey cloth cover hairline, clear mesh in the coating process, no hole pasting, guarantee of the quality of the glue-coated mesh cloth and contribution to the penetration of cement mortar.
The yarn for the fabric prepared by the invention has good alkali resistance, and SIC (cement mortar) strength retention can reach more than 500 MPa.
Detailed Description
The present invention is further described below with reference to examples.
Examples 1 to 8
The data for the content of each component of the glass compositions having good alkali resistance in examples 1 to 8 are shown in Table 1.
The glass composition with good alkali resistance is prepared from the following raw materials: coal-series kaolin, quartz powder, quicklime, magnesium oxide, albite and anhydrous sodium sulphate, wherein the particle size of each raw material is 150-200 mu m.
A yarn for textile fabrics made of a glass composition having good alkali resistance is prepared by the following steps:
(1) weighing the raw materials of the glass fiber composition according to the proportion, and then mechanically mixing the raw materials to obtain a uniform batch;
(2) melting the batch at 1450-1500 ℃ to obtain glass liquid;
(3) drawing the molten glass into fibers with the diameter of 10-20 mu m by a 1200-hole bushing with the temperature of 1150-1250 ℃, cooling the monofilaments by spraying, and coating impregnating compound by an oiling machine to prepare the yarn for the fabric. The diameter of the yarn for textile was 13 μm.
Comparative examples 1 to 3
Comparative example 1 is medium alkali yarn, comparative example 2 is alkali-free yarn, comparative example 3 is alkali-resistant yarn, and the content data of each component are shown in table 1.
The yarns of examples 1-8 and comparative examples 1-3 were subjected to fiberization performance, alkali resistance, alkali strength retention, acid strength retention, water strength retention, cement mortar retention, and the data are shown in table 1.
Wherein the fiberization properties of the yarn comprise: fiber forming temperature, liquidus temperature and Δ T. The fiber forming temperature was measured using a high temperature viscometer; the liquidus temperature is the highest temperature at which equilibrium exists between the liquid glass and its main crystalline phase, measured in a crystallization furnace, where the highest temperature at which crystals exist is considered the liquidus temperature, and at all temperatures above the liquidus, the glass has no crystals in its essential phase and below the liquidus temperature, crystals may form.
Δ T is the difference between the fiber forming temperature and the liquidus temperature. A glass fiber has a large Δ T, indicating a wider process window during the formation of the glass fiber, and helps prevent devitrification of the glass during melting and fiberization.
The alkali resistance of the yarn is tested by referring to GB/T32644-2016 standard, and the used chemical reagents and test conditions are as follows: 5.0% NaOH, etched at 80 ℃ for 96 hours.
The retention rate of alkali-resistant, acid-resistant and water-resistant strength of the yarn is tested according to a GB/T20102-2006 method, and the alkali-resistant test conditions are as follows: 5.0 percent of NaOH is corroded for 96 hours at the temperature of 30 +/-2 ℃; acid resistance test conditions: 10% H2SO4Erosion is carried out for 96 hours at the temperature of 30 +/-2 ℃, and water bath is carried out for 96 hours at the temperature of 80 ℃ under the water resistance test condition.
The cement mortar retention strength TEST is based on the precast concrete product-cement and TEST method of residual strength of glass fiber in concrete (SIC TEST).
TABLE 1 data table of the contents of the components and yarn properties for examples 1-8 and comparative examples 1-3
Figure BDA0002664859220000051
Figure BDA0002664859220000061
The total amount of the components listed in the compositions in the tables is not always 100%, and the amount of the remaining chemical components is less than 0.1 wt.%, which is a trace component, and has no substantial effect on the present invention.
To ensure the data are comparable, the yarns of the examples and comparative examples in table 1 were run under experimental conditions of uniform fiber diameter, uniform yarn diameter.
In table 1, comparative example 1 is medium alkali yarn, comparative example 2 is alkali-free yarn, and comparative example 3 is alkali-resistant yarn. Compared with the conventional alkali-free yarn, the yarn for the fabric has good alkali resistance; compared with medium-alkali yarn, the alkali-resistant yarn has outstanding alkali resistance and higher mechanical strength; compared with alkali-resistant yarns, the invention has lower glass cost and less hairiness.
The yarns of examples 1-3 and comparative examples 1-2 were prepared into a mesh fabric, and the mesh fabric was subjected to an alkali resistance test under the following conditions: the obtained product was immersed in a 5% NaOH solution at 80. + -. 2 ℃ for 6 hours, and the data are shown in Table 2.
TABLE 2 alkali resistance data sheet
Figure BDA0002664859220000071
As can be seen from comparison of the data in table 2, the retention rate of the alkali-resistant tensile breaking strength of the mesh fabric made of the yarn for fabric of the present invention is greater than that of the mesh fabric made of the yarns of comparative examples 1 to 2, and therefore the yarn for fabric of the present invention is excellent in alkali resistance.
The invention has the advantages that the glass component is obtained by optimizing the glass component, the design of the glass component not only needs to realize the expected performance index, but also needs to have process feasibility, the large-scale production can be carried out by adopting raw materials with low energy consumption and low emission and a manufacturing process while meeting the performance requirement, the adaptability of large tank furnace wire drawing is realized, and good cost benefit is provided for the composite material industry.

Claims (9)

1. A glass composition having excellent alkali resistance, characterized in that: the weight percentage of each component is as follows: SiO 22：60.0-72.0wt.%，CaO：7.0-14.0wt.%，MgO：5.0-8.0wt.%，Al2O3：0-5.0wt.%，TiO2：0-3.0wt.%，Fe2O3：0-1.0wt.%，R2O：8.0-11.0wt.%， ZrO2：0.5-5.0wt.%，R2O is Na2O+ K2O, and the balance of impurities;
the mass percentage of MgO to CaO is 0.5-1.0.
2. The glass composition with good alkali resistance according to claim 1, characterized in that: the weight percentage of each component is as follows: SiO 22：68.0-71.0wt.%，CaO：8.0-12.0wt.%，MgO：5.0-8.0wt.%，Al2O3：0-5.0wt.%，TiO2：0-3.0wt.%，Fe2O3：0-1.0wt.%，Na2O：8.0-10.5wt.%，K2O：0-1.0wt.%，ZrO2: 0.5-5.0wt.%, with the balance being impurities.
3. The glass composition with good alkali resistance according to claim 2, characterized in that: MgO and Na2MgO/Na in terms of the mass percentage of O2O is 0.5-0.9.
4. The glass composition with good alkali resistance according to claim 1, characterized in that: the fiber forming temperature of the glass composition is 1200-1300 ℃, and the liquidus temperature is 1100-1250 ℃.
5. The glass composition with good alkali resistance according to claim 4, characterized in that: the difference delta T between the fiber forming temperature and the liquidus temperature is 50-120 ℃.
6. The glass composition with good alkali resistance according to claim 1, characterized in that: the feed is prepared from the following raw materials: coal series kaolin, quartz powder, quicklime, magnesium oxide, albite, anhydrous sodium sulphate and zircon powder, wherein the average particle size is 100-200 mu m.
7. A textile yarn made from the composition of claim 1, wherein: the preparation process comprises the following steps:
(1) weighing the raw materials of the glass composition according to the proportion and mixing the raw materials to obtain a uniform batch;
(2) melting the batch to obtain glass liquid;
(3) drawing the glass liquid into fibers through a bushing, cooling, coating the fibers with a sizing agent, and preparing the yarns for the fabric.
8. The yarn of claim 7, wherein: the melting temperature is 1450-1500 ℃, and the bushing temperature is 1150-1250 ℃.
9. The yarn of claim 7, wherein: the single yarn hairiness amount of the fabric yarn is less than or equal to 1, the SIC strength is kept above 500MPa, the fabric yarn is made into the mesh fabric, and the alkali-resistant tensile breaking strength retention rate of the mesh fabric reaches above 80%.
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