JP2017075079A - Glass strand, glass roving and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass strand excellent in dispersibility in a mortar and capable of easily being made as monofilament in water.SOLUTION: A glass strand consists of a plurality of glass filaments containing ZrOof 12 mass% or more and RO, where R is at least one kind selected from Li, Na and K, of 10 mass% or more, having a coating which coats a surface of the glass filament and the coating contains a substituted polyester resin having an aromatic ring, glass transition temperature of the unsaturated polyester resin is 10°C or less and content of the unsaturated polyester resin in the coating is 40 mass% or more.SELECTED DRAWING: None

Description

  The present invention relates to a glass strand, a glass roving, and a method for producing the glass roving.

  Glass strands made of alkali resistance are widely used as reinforcing materials for GRC (Glassfibre Reinforced Concrete), and are known as effective means for supplementing brittleness and improving tensile strength, bending strength, and impact strength to cement. ing.

  As a manufacturing method of GRC, for example, glass chopped strands obtained by cutting glass strands are mixed with mortar made of cement, aggregate, water, admixture, etc., which are mixed in advance, and then formed into a predetermined shape. A method of manufacturing by molding is known.

  Glass strands can be obtained by applying a sizing agent using an applicator to a glass filament obtained by drawing molten glass from a bushing having hundreds to thousands of nozzles, and then converging them. . The obtained glass strand is cut into a predetermined length and used as a glass chopped strand.

  There are a direct method and an indirect method as methods for cutting glass strands into glass chopped strands. The direct method is a method in which a glass strand obtained by bundling glass filaments using a sizing agent is not wound, but is cut and dried immediately after bundling.

  On the other hand, the indirect method is a spinning process in which a glass strand obtained by bundling glass filaments using a sizing agent is aligned and wound around a paper tube to produce a wound body, and wound. A drying process for drying the wound body and forming a sizing agent film on the surface of the glass strand, and a processing process for producing a glass chopped strand by cutting the glass strand from the dried wound body into a predetermined length. A method comprising:

  The sizing agent functions to prevent the glass filament surface formed in the spinning process from being scratched, to prevent the generation of fuzz and yarn breakage in the processing process, and to bind the glass strand, thereby forming the GRC. It has a function to improve workability and strength characteristics.

  As an example of such a sizing agent, the following Patent Document 1 discloses a sizing agent containing a (meth) acrylic acid ester copolymer as a film forming agent and polyethylene glycol lauryl ether as a surfactant. Has been. Moreover, the following patent document 2 discloses a sizing agent containing a polyacrylic ester resin and a cationic surfactant.

JP 59-217646 A Japanese Examined Patent Publication No. 61-25667

  However, the glass strands obtained by using sizing agents such as Patent Document 1 and Patent Document 2 have a problem in that they are not sufficiently opened in water and are difficult to form monofilaments in water. Therefore, the dispersibility in mortar containing water is not sufficient, and the strength characteristics of GRC cannot be sufficiently improved.

  Moreover, when manufacturing a glass strand by the indirect method using the sizing agent of patent document 1 and patent document 2, an alkaline component may elute from glass fiber in a drying process, and it may mix in the film of a sizing agent. there were. When an alkali component is mixed in the coating, it reacts with the constituent components of the coating, and the function of the coating may be impaired. For this reason, the coating obtained by drying the sizing agent is likely to be brittle and deteriorate, and it may be difficult to unwind the glass strand from the wound body. This phenomenon is particularly prominent when the moisture content of the glass strand is 0.5% by mass or less.

  An object of the present invention is to provide a glass strand excellent in dispersibility in mortar (which can be easily monofilarized in water), a glass roving using the same, and a method for producing the glass roving.

The glass strand according to the present invention contains, as a glass composition, a plurality of ZrO ₂ containing 12% by mass or more and R ₂ O (R is at least one selected from Li, Na and K) of 10% by mass or more. A glass strand made of a glass filament, having a coating covering the surface of the glass filament, the coating containing a saturated polyester resin having an aromatic ring, and a glass transition temperature of the saturated polyester resin being 10 ° C. The content of the saturated polyester resin in the coating is 40% by mass or more.

  In the glass strand according to the present invention, preferably, the coating further contains a nonionic surfactant.

  In the glass strand according to the present invention, preferably, the coating further contains polyvinylpyrrolidone.

  In the glass strand according to the present invention, preferably, the content of the saturated polyester resin in the coating is 90% by mass or less.

  In the glass strand according to the present invention, preferably, the content of the saturated polyester resin in the coating is 1.2 times or more the content of the nonionic surfactant.

  In the glass strand according to the present invention, the content of the nonionic surfactant in the coating is preferably 10% by mass or more and 50% by mass or less.

  In the glass strand according to the present invention, preferably, the content of the polyvinyl pyrrolidone in the coating is 0.1% by mass or more and 20% by mass or less.

  In the glass strand according to the present invention, preferably, the nonionic surfactant is a polyoxyalkylene alkyl ether having a molecular weight of 1500 or less.

  The glass strand according to the present invention preferably has a count of 20 tex or more and 1000 tex or less.

  The glass strand according to the present invention preferably has a cut length of 3 mm or more and 40 mm or less.

  The glass strand according to the present invention is preferably used as a reinforcing material for cementitious materials.

  The glass roving according to the present invention comprises a wound body of glass strands constructed according to the present invention.

  A glass roving manufacturing method according to the present invention is a glass roving manufacturing method configured according to the present invention, wherein a molten glass drawn from a nozzle is cooled to form a glass filament, and a plurality of said glasses Applying a sizing agent for forming the coating on the surface of the filament, converging the plurality of glass filaments, winding the glass strand obtained by concentrating the plurality of glass filaments, A step of producing a wound body, and a step of drying the wound body until the moisture content of the glass strand is 0.5% by mass or less.

  ADVANTAGE OF THE INVENTION According to this invention, the glass strand excellent in the dispersibility in mortar (it can be easily monofilarized in water) can be provided.

It is a typical perspective view which shows the glass roving which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments will be described. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments. Moreover, in each drawing, the member which has the substantially the same function may be referred with the same code | symbol.

The glass strand of the present invention contains, as a glass composition, a plurality of glasses containing 12% by mass or more of ZrO ₂ and 10% by mass or more of R ₂ O (R is at least one selected from Li, Na and K). It consists of a filament. The moisture content of the glass strand of this invention is 0.5 mass% or less. Moreover, as for the glass strand of this invention, the surface of the said glass filament is covered with the film. The coating contains a saturated polyester resin having an aromatic ring. The glass transition temperature of the saturated polyester resin is 10 ° C. or lower. Content of the said saturated polyester resin in the said film is 40 mass% or more. In addition, content of the said saturated polyester resin is content when the said whole film is 100 mass%.

Glass strands of the present invention has a glass composition, because it contains glass filaments containing a ZrO ₂ or 12 wt%, is excellent in alkali resistance. Therefore, even when used as a reinforcing material for a cement-based material, the glass strands are hardly eroded by the alkaline substance in the cement. Therefore, it can prevent that the mechanical strength of a glass strand falls by an alkaline substance.

However, glass containing 12% by mass or more of ZrO ₂ is difficult to melt, but the glass strand of the present invention contains 10% by mass or more of R ₂ O, and thus contains 12% by mass or more of ZrO _2. Even meltability is excellent. Note that the _{R 2} O is 10 wt% or more, _Li 2 O in the glass filaments, the total content of Na ₂ O and _{K 2} O, refers to at least 10 mass%.

  Since the film covering the surface of the glass filament is composed of a saturated polyester resin having no double bond, the reactivity with the alkali component eluted from the glass is low. Therefore, in the glass strand of this invention, the function of a film is hard to be inhibited by an alkali component, and the brittleness or deterioration of the film hardly occurs.

  In the glass strand of this invention, since the glass transition temperature of the saturated polyester resin which comprises the said film is 10 degrees C or less, the said film is hard to be solidified at normal temperature. Therefore, also from this point, in the glass strand of the present invention, the brittleness and deterioration of the coating due to drying hardly occur.

  In addition, since the above-mentioned coating is hard to be solidified at normal temperature, the glass filaments are not highly converging. Therefore, the glass strand of the present invention is excellent in dispersibility in mortar and can be easily monofilamentized in water. .

  In the glass strand of this invention, since the saturated polyester resin which comprises the said film has an aromatic ring, it has high hydrophobicity. For this reason, when moisture enters between the glass filaments, the moisture present between the glass filaments repels the saturated polyester resin constituting the coating. Therefore, the glass strand is opened by the repulsion between the saturated polyester resin and moisture between the glass filaments, and can easily be made into a monofilament.

  As described above, since the glass strand of the present invention can be easily monofilarized in water, it is preliminarily mixed with cement or aggregate not containing water and easily opened by adding water during use. be able to. In addition, the glass strand of the present invention is excellent in openability and can easily disperse monofilaments in the mortar, so that cracks hardly occur when the mortar shrinks by drying. Moreover, since it is excellent in dispersibility in mortar, the mechanical strength of the cementitious material can be effectively increased.

  Furthermore, since the content of the saturated polyester resin in the coating film is 40% by mass or more in the glass strand of the present invention, the opening property of the glass strand in water can be further improved.

  Since the mechanical strength of the cement-based material can be effectively increased, the glass strand of the present invention can be suitably used as a reinforcing material for the cement-based material. The glass strand of the present invention may be stored in a state where it is wound up into a glass roving, and the glass strand may be drawn from the glass roving during use.

  Hereinafter, the glass strand and the glass roving of the present invention will be described in more detail.

(Glass strand)
The glass strand of the present invention is a bundling body of a plurality of glass filaments. Although it does not specifically limit as the number of the glass filaments which comprise the said glass strand, For example, it can be set to about several dozen to several hundred. The glass filaments are focused by applying a sizing agent to the surface.

The glass strand is, for example, as a glass composition in mass%, SiO ₂ 54 to 65%, ZrO ₂ 12 to 25%, Li ₂ O 0 to 5%, Na ₂ O 10 to 17%, K ₂ O 0 to 0%. 8%, R′O (where R ′ represents Mg, Ca, Sr, Ba, Zn) 0-10%, TiO ₂ 0-7%, Al ₂ O ₃ 0-2%, preferably , by _{mass%, SiO 2 57~64%, ZrO} 2 14~24%, Li 2 O 0.5~3%, Na 2 O 11~15%, K 2 O 1~5%, R'O ( except , R ′ represents Mg, Ca, Sr, Ba, Zn) 0.2 to 8%, TiO ₂ 0.5 to 5%, Al ₂ O ₃ 0 to 1%.

  The count of the glass strand is not particularly limited, but is preferably 20 tex or more and 1000 tex or less. When the count of a glass strand exists in the said range, the dispersibility in mortar can be improved.

  The glass strand of the present invention is desirably used as a glass chopped strand by being cut into a predetermined length. Although it does not specifically limit as cut length of a glass strand, It is preferable that they are 3 mm or more and 40 mm or less. When the cut length is less than 3 mm, the mechanical strength of the cement-based material may not be expressed. On the other hand, if the cut length is larger than 40 mm, it becomes bulky in the mortar, which may make it difficult to knead.

  As described above, the surface of the glass strand of the present invention is covered with a coating. The coating is formed by applying a sizing agent to the surface of the glass filament.

  The ignition loss of the glass strand of the present invention is preferably 0.5% by mass or more and 1.5% by mass or less. The ignition loss is a value measured by the method described in JIS R3420 (2013).

  The coating includes a saturated polyester resin. Content of the said saturated polyester resin in the said film is 40 mass% or more. It is preferable that content of the said saturated polyester resin in the said film is 45 mass% or more. The content of the saturated polyester resin in the coating is preferably 90% by mass or more. Moreover, the said film may further contain the nonionic surfactant and polyvinylpyrrolidone.

(Saturated polyester resin)
The saturated polyester resin is not particularly limited as long as it has an aromatic ring and has a glass transition temperature of 10 ° C. or lower. In order to make the coating harder to solidify at room temperature, the glass transition temperature of the saturated polyester resin is preferably 0 ° C. or lower, more preferably −5 ° C. or lower.

  The saturated polyester resin is obtained by condensing a dibasic acid component and a glycol component.

  Examples of the dibasic acid component constituting the saturated polyester resin include succinic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and diphenyldicarboxylic acid as saturated aliphatic dicarboxylic acids. A dibasic acid having a phenyl group such as an acid can be used.

  As the glycol component constituting the saturated polyester resin, a general glycol component such as ethylene glycol or propylene glycol, or a glycol component having a phenyl group such as a bisphenol A alkylene oxide adduct may be used. it can.

  Since the saturated polyester resin has an aromatic ring, it has high hydrophobicity, and repulsion between glass filaments is easily obtained as described above.

  Content of the said saturated polyester resin in a film is 40 mass% or more. When content of the said saturated polyester resin is more than the said minimum, the openability of the glass strand in water can be improved further. From the viewpoint of further improving the openability of the glass strand, the content of the saturated polyester resin is preferably 1.2 times or more the content of the following nonionic surfactant.

  On the other hand, the upper limit of the content of the saturated polyester resin is preferably 90% by mass. This is because when the content of the saturated polyester resin exceeds the upper limit, the film becomes viscous and may fluff when contacting the processed member in the processing step. In addition, content of the said saturated polyester resin is content when the said whole film is 100 mass%.

(Nonionic surfactant)
The coating may further contain a nonionic surfactant. Since the nonionic surfactant is amphiphilic and difficult to ionize, it is difficult to chemically adsorb to glass or other raw materials, enters into the saturated polyester resin, and penetrates moisture into the saturated polyester resin. Can be made easier. Therefore, when the coating contains a nonionic surfactant, moisture is easily taken into the resin, and the repulsion between the glass filaments described above can be more easily generated, and the glass strand can be more easily opened. Can be made fine.

  The nonionic surfactant is not particularly limited, but is ether type polyoxyethylene alkyl ether, polyoxyalkylene alkyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene polyoxypropylene glycol, and the like, ester type A higher alcohol fatty acid ester such as propylene glycol can be used. Polyoxyalkylene alkyl ether is preferably used because of its low toxicity.

  The molecular weight of the nonionic surfactant is preferably 1500 or less. When the molecular weight of the nonionic surfactant is not more than the above upper limit, the saturated polyester resin can enter more easily and moisture easily enters the resin, so that repulsion between the glass filaments is further generated. The glass strand can be opened more easily. The molecular weight of the nonionic surfactant is preferably 300 or more.

  The content of the nonionic surfactant is not particularly limited, but is preferably 10% by mass or more and 50% by mass or less. When the content of the nonionic surfactant is within the above range, repulsion between the glass filaments can be more easily generated, and the glass strand can be more easily opened.

  In addition, content of the said nonionic surfactant is content when the said whole film is 100 mass%.

(Polyvinylpyrrolidone)
The coating preferably further contains polyvinylpyrrolidone.

  Since the coating film contains the saturated polyester resin and polyoxyalkyl ether surfactant, which are difficult to solidify at room temperature, the coating film tends to be highly viscous. In that case, the polyvinyl pyrrolidone is added. Thereby, the viscosity of a film can be reduced.

  When polyvinyl pyrrolidone is contained in the coating, the viscosity of the coating can be lowered, and therefore, when processing by cutting or winding the glass strand, fluff and thread breakage are further generated. Can be suppressed. And since the said polyvinyl pyrrolidone is water-soluble, it does not inhibit the monofilament formation by opening of a glass strand.

  Although content of the said polyvinylpyrrolidone is not specifically limited, It is preferable that it is 0.1 to 20 mass%. When there is too little content of the said polyvinyl pyrrolidone, the viscosity of a film may not fully be reduced. On the other hand, if the content of the polyvinyl pyrrolidone is too high, the water strand is lower than other raw materials (saturated polyester resin, nonionic surfactant), so that the glass strand cannot be sufficiently opened instantly in water and monofilarized. It may be difficult.

  In addition, content of the said polyvinyl pyrrolidone is content when the said whole coating is 100 mass%.

(Glass roving)
FIG. 1 is a schematic perspective view showing glass roving according to an embodiment of the present invention. As shown in FIG. 1, the glass roving 10 has a cylindrical structure in which the glass strands 11 are stacked and wound so as to form a layer. The glass strand 11 is the glass strand configured according to the present invention. That is, the glass roving of the present invention is composed of a wound body of the above glass strand constituted according to the present invention.

  The manufacturing method of the glass roving of this invention is not specifically limited, For example, it can manufacture with the following method.

  First, after the glass raw material thrown into the glass melting furnace is melted to form molten glass, and the molten glass is brought into a homogeneous state, the molten glass is drawn out from a heat-resistant nozzle attached to the bushing. Thereafter, the drawn molten glass is cooled to form a glass filament.

  Next, a sizing agent for forming the above-described glass strand coating of the present invention is applied to the surface of the glass filament. In a state where the sizing agent is uniformly applied, several hundred to several thousand glass filaments are drawn and bundled to form glass strands. Although the obtained glass strand may be directly cut by the direct method, this production method exemplifies a method using the indirect method.

  In the manufacturing method based on the indirect method, first, a glass strand obtained by bundling glass filaments using a sizing agent is wound around a manufacturing paper tube to produce a cake (rolled body). . Subsequently, the wound cake is dried until the moisture content of the glass strand is 0.5% by mass or less, and a film derived from a sizing agent is formed on the surface of the glass strand to obtain glass roving. In addition, it is good also as glass roving by bundling together and winding up the glass strand unwound from the obtained several glass roving.

  The glass roving thus produced can be stocked in its shape and used as necessary. It can also be cut together. The glass roving can be used as a glass chopped strand by cutting while unwinding the glass strand.

  The glass roving wound up in a wound shape is packed with organic film materials, such as shrink wrap and stretch film, for the purpose of preventing dust and dirt and protecting the fiber surface. It will be supplied to customers in the state of being stacked in stages.

  According to the manufacturing method of the glass roving of the present invention, by performing the sizing agent application process in a state cooled to an appropriate temperature, uniform application can be performed without excess and deficiency, and by performing the winding process after these processes, Excellent quality glass roving can be obtained. Moreover, even if the moisture content of the glass strand is dried to 0.5% by mass or less, the coating is not easily brittle or deteriorated.

  The sizing agent includes a saturated polyester resin having an aromatic ring. The glass transition temperature of the saturated polyester resin is 10 ° C. or lower. The ratio of the said saturated polyester resin in the component which forms the film contained in the said sizing agent is 40 mass% or more. The sizing agent may contain a nonionic surfactant or polyvinyl pyrrolidone.

  The saturated polyester resin and nonionic surfactant constituting the sizing agent are the same as the saturated polyester resin and nonionic surfactant described in the column of the coating, respectively, with the addition amount described in the column of the coating. Can be used. Moreover, the said polyvinyl pyrrolidone can be used in the addition amount demonstrated in the column of the said film.

  Furthermore, the sizing agent may contain, for example, a silane coupling agent in addition to the above components. Specific examples of the silane coupling agent include amino silane, epoxy silane, vinyl silane, acrylic silane, chloro silane, mercapto silane, and ureido silane. In addition, the reactivity with the sizing agent on the surface of the glass strand can be improved by adding the silane coupling agent, and mechanical strength such as tensile strength can be further improved.

  In addition to the silane coupling agent described above, the sizing agent can contain components such as a lubricant, a nonionic surfactant, and an antistatic agent. The mixing ratio of each component is necessary. It may be determined according to.

  Since the sizing agent contains a saturated polyester resin having no double bond, it hardly reacts with an alkaline component eluted from the glass fiber. Therefore, in the glass roving manufacturing method of the present invention, the function of the sizing agent is hardly impaired during drying in the indirect method. And since the glass transition temperature of saturated polyester resin is 10 degrees C or less, since it does not solidify at normal temperature, the brittleness and deterioration of the film by drying hardly occur. Further, when the strand is unwound from the obtained glass roving, the unwinding resistance is hardly increased, and the occurrence of yarn breakage can be suppressed. Furthermore, when the content of the saturated polyester resin contained in the sizing agent is 40% by mass or more, the openability of the glass strand in water can be further enhanced.

  The coating amount of the sizing agent is preferably 0.5% by mass or more and 1.5% by mass or less. If the coating amount of the sizing agent is less than 0.5% by mass, the glass filaments do not converge, making it difficult to produce glass strands, or the convergence is weak, and fluff may be likely to occur. . On the other hand, if it exceeds 1.5% by mass, it is difficult for water to penetrate into the sizing agent.

  Hereinafter, the present invention will be described in more detail based on specific examples. The present invention is not limited to the following examples, and can be implemented with appropriate modifications without departing from the scope of the invention.

Example 1
(Preparation of sizing agent)
The mass ratio of the constituent components in the coating is 61.3% by mass of saturated polyester resin, 30.2% by mass of polyoxyalkylene alkyl ether, 8.2% by mass of polyvinyl pyrrolidone, and epoxy silane coupling agent 0 with respect to the total mass of the coating. A sizing agent was prepared by intimately mixing saturated polyester resin, polyoxyalkylene alkyl ether, polyvinylpyrrolidone and epoxysilane coupling agent in water so that the amount was 3% by mass.

  As the saturated polyester resin, a saturated polyester resin having a glass transition temperature (Tg) of −10 ° C. was used.

(Production of glass chopped strand)
First, SiO ₂ 57.9 mass%, ZrO ₂ 17.2 mass%, Li ₂ O 0.5 mass%, Na ₂ O 14.8 mass%, K ₂ O 1.3 mass%, CaO 0.9 mass. %, A glass filament was drawn from a bushing having hundreds to thousands of nozzles of molten glass obtained by melting a raw material having a composition of TiO ₂ 7.4% by mass.

  Next, using an applicator on the surface of the obtained glass filament, the sizing agent prepared in advance was applied so that the loss on ignition was 0.72% by mass, and the glass filaments were bundled by bundling the glass filaments. The cake was produced by winding the glass strand. The loss on ignition was measured by the method described in JIS R3420 (2013).

  Next, the cake was dried at 130 ° C. for 10 hours, and cut into 13 mm cut lengths while unraveling the strands from the cake, thereby producing glass chopped strands.

(Examples 2-9 and Comparative Examples 1-3)
A glass chopped strand was produced in the same manner as in Example 1 except that the composition of the sizing agent, the amount of sizing agent applied, and the cut length were set as shown in Tables 1 to 3 below.

  In preparing the sizing agent, in Comparative Example 1, a saturated polyester resin having a Tg of 20 ° C. was used instead of the saturated polyester resin having a Tg of −10 ° C. In Comparative Example 3, an unsaturated polyester resin having a Tg of −5 ° C. was used instead of the saturated polyester resin having a Tg of −10 ° C.

(Evaluation)
The following evaluation was performed about the glass chopped strand obtained in Examples 1-9 and Comparative Examples 1-3. The results are shown in Tables 1 to 3 below.

  The moisture content was measured according to JIS R3420 (2013).

  The spreadability was evaluated using each glass chopped strand obtained in Examples 1 to 9 and Comparative Examples 1 to 3. The spreadability was evaluated by counting the number of glass chopped strands that were not completely monofilamentated after the glass chopped strands were put into water.

  More specifically, 20 liters of water is first stirred using a stirrer at a rotation speed of 200 rpm. Subsequently, 10 g of chopped strands weighed are put into it and stirred for 30 seconds. Next, 20 liters of water mixed with glass chopped strands was transferred to a paper machine, and only glass chopped strands were picked up with a mesh having an opening of about 100 μm. Subsequently, the glass chopped strands remaining on the mesh were observed, and the number of glass chopped strands that were not completely monofilaments was counted.

10 ... Glass roving 11 ... Glass strand

Claims (13)

The glass composition is a glass strand composed of a plurality of glass filaments containing 12% by mass or more of ZrO ₂ and 10% by mass or more of R ₂ O (R is at least one selected from Li, Na and K). And
Having a coating covering the surface of the glass filament;
The coating contains a saturated polyester resin having an aromatic ring,
The glass strand whose glass transition temperature of the said saturated polyester resin is 10 degrees C or less, and whose content of the said saturated polyester resin in the said film is 40 mass% or more.   The glass strand of claim 1, wherein the coating further comprises a nonionic surfactant.   The glass strand according to claim 1 or 2 in which said coat further contains polyvinylpyrrolidone.   The glass strand of any one of Claims 1-3 whose content of the said saturated polyester resin in the said film is 90 mass% or less.   The glass strand of any one of Claims 2-4 whose content of the said saturated polyester resin is 1.2 times or more of content of the said nonionic surfactant in the said film.   The glass strand of any one of Claims 2-5 whose content of the said nonionic surfactant in the said film is 10 mass% or more and 50 mass% or less.   The glass strand of any one of Claims 3-6 whose content of the said polyvinyl pyrrolidone in the said film is 0.1 mass% or more and 20 mass% or less.   The glass strand according to any one of claims 2 to 7, wherein the nonionic surfactant is a polyoxyalkylene alkyl ether having a molecular weight of 1500 or less.   The glass strand of any one of Claims 1-8 whose count is 20 tex or more and 1000 tex or less.   The glass strand of any one of Claims 1-9 whose cut length is 3 mm or more and 40 mm or less.   The glass strand of any one of Claims 1-10 used for the reinforcing material of a cement-type material.   The glass roving which consists of a winding body of the glass strand of any one of Claims 1-11. It is a manufacturing method of the glass roving of Claim 12,
Cooling the molten glass drawn from the nozzle to form a glass filament;
Applying a sizing agent for forming the coating on the surface of a plurality of glass filaments, and bundling the plurality of glass filaments;
Winding a glass strand obtained by bundling the plurality of glass filaments to produce a wound body;
And a step of drying the wound body until the moisture content of the glass strand is 0.5% by mass or less.

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