CN114164558A - Alkali-free glass fiber non-woven fabric and manufacturing method thereof - Google Patents
Alkali-free glass fiber non-woven fabric and manufacturing method thereof Download PDFInfo
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- CN114164558A CN114164558A CN202111434534.1A CN202111434534A CN114164558A CN 114164558 A CN114164558 A CN 114164558A CN 202111434534 A CN202111434534 A CN 202111434534A CN 114164558 A CN114164558 A CN 114164558A
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- 239000003365 glass fiber Substances 0.000 title claims abstract description 90
- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000004744 fabric Substances 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 238000007598 dipping method Methods 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims description 20
- 238000009960 carding Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 12
- 238000004513 sizing Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000004080 punching Methods 0.000 claims description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 239000000839 emulsion Substances 0.000 claims description 8
- 238000007790 scraping Methods 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000007596 consolidation process Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical group [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000009970 fire resistant effect Effects 0.000 abstract description 20
- 239000010445 mica Substances 0.000 abstract description 16
- 229910052618 mica group Inorganic materials 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- 238000009941 weaving Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- 239000002759 woven fabric Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 238000005096 rolling process Methods 0.000 description 2
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- 239000012467 final product Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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- 239000011782 vitamin Substances 0.000 description 1
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Images
Classifications
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
- D04H1/4218—Glass fibres
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
- D04H1/645—Impregnation followed by a solidification process
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention belongs to the technical field of non-woven fabrics, and particularly provides an alkali-free glass fiber non-woven fabric and a manufacturing method thereof. The alkali-free glass fiber non-woven fabric provided by the invention adopts the alkali-free glass fiber chopped fibers with the content of more than 90 as raw materials, and is prepared by a needling method or a thermal bonding method, so that the process is short, the supporting facilities are few, the cost is saved, and the construction period is shortened; the gram weight of the alkali-free glass fiber non-woven fabric is 15-210 g/m2The thickness of the woven cloth is 4-10% thinner than that of the alkali-free glass fiber woven cloth with the same specification, the cloth cover appearance flaws are few, the gum dipping performance is better, the tensile strength is higher, burrs are not easy to generate in tape cutting, and the woven cloth can be used on products such as fire-resistant mica tapes for fire-resistant cables, fire-resistant mica tapes for motors and the like, and has the advantages of being small in cloth cover appearance flaws, good in gum dipping performance, high in tensile strength, low in possibility of generating burrs in tape cutting, and capable of being used on products such as fire-resistant mica tapes for fire-resistant cables, fire-resistant mica tapes for motors and the likeHas good application value.
Description
Technical Field
The invention belongs to the technical field of non-woven fabrics, and particularly relates to an alkali-free glass fiber non-woven fabric and a manufacturing method thereof.
Background
The mica base cloth on the market is manufactured by a weaving method at present, the mica base cloth produced by the traditional shuttle loom and the traditional air jet loom has the defects of more appearance defects of cloth surfaces, poor adhesion with silicon resin, hard tape making, easy generation of burrs during slitting, influence on the integral fire-resistant insulating property of a fire-resistant tape and a motor tape, the weaving speed of the shuttle loom is 0.08-0.8 m/min, the weaving speed of the air jet loom is 0.4-4 m/min, the working procedure is long, the supporting facilities are more, the production and quality influence links are more, the cost is high, and the delivery period is long.
In recent years, rapid development of nonwoven technology and widespread use of products thereof have made nonwoven fabric products having multiple functions increasingly occupy the market. The development of the non-woven fabric keeps a higher growth speed all the time, and the non-woven fabric almost completely omits warping, slashing and weaving of the traditional textile in the textile aspect except the opening, carding and other pre-spinning processes of the textile from the technical characteristic, and forms a fiber product by a very short process, high efficiency (the production speed can reach 10-300 m/min generally) and basic realization of automation so as to meet various requirements of the application market. However, the non-woven technology is not used for producing mica base cloth at present, because the strength of the chopped fiber non-woven fabric is not enough, the invention provides a preparation method, and the alkali-free glass fiber non-woven fabric which is light and thin in quality, good in gum dipping performance and capable of meeting the tensile strength required by products such as a fire-resistant mica tape for a fire-resistant cable, a fire-resistant mica tape for a motor and the like is obtained by adjusting the proportion of alkali-free glass chopped fibers and a sizing agent in raw materials and the non-woven technology.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, mica base cloth has many defects on appearance of cloth surface, poor adhesion with silicon resin, hardness after belt making, easy generation of burrs during slitting, influence on the integral fire-resistant insulating property of a fire-resistant belt and a motor belt, high cost and long service life.
Therefore, the invention provides an alkali-free glass fiber non-woven fabric which is prepared by taking alkali-free glass fiber chopped fibers and a sizing agent as raw materials, wherein the content of the alkali-free glass chopped fibers is more than 90% and less than or equal to 100%; the weight of the alkali-free glass fiber non-woven fabric is 15-210 g/m2. Preferably, the gram weight of the alkali-free glass fiber non-woven fabric is 50 to 120 g/m2More preferably, alkali-free glass fibersThe gram weight of the vitamin non-woven fabric is 15-40 g/m2。
Specifically, the upper sizing agent is 5-30% of acrylic emulsion or 5-30% of waterborne polyurethane.
The invention also provides a manufacturing method of the alkali-free glass fiber non-woven fabric, which comprises the following steps:
(1) raw materials: selecting and preparing alkali-free glass fiber chopped fibers and a sizing agent, wherein the alkali-free glass fiber chopped fibers are not less than 90%;
(2) opening: putting the raw materials into an opener for pre-opening and opening to release the fibers;
(3) feeding: feeding by using a feeding machine;
(4) carding: carding, removing impurities and mixing by a carding machine;
(5) lapping: uniformly paving the carded alkali-free glass fiber chopped fibers into a fiber net with certain thickness and width by using a lapping device;
(6) consolidation: reinforcing the fiber net by adopting a needle punching method or a thermal bonding method to prepare alkali-free glass fiber non-woven fabric;
(7) and (4) adjusting the tension of the alkali-free glass fiber non-woven fabric, cutting, curling and warehousing.
Specifically, the lapping device in the step (5) comprises a lapping machine, an air suction channel and a drafting air channel; two ends of a net curtain of the net forming machine are provided with position-adjustable baffles which are used for controlling the net forming width and enabling the edges of the fiber net to be neat; the air suction channel is arranged at the lower part of the net curtain of the net forming machine and is connected with the suction fan; and an air outlet of the drafting air channel faces to the upper part of the net curtain of the net forming machine.
Specifically, the needling method in step (6) includes pre-needling and main needling, and the fiber web is needled and consolidated from top to bottom.
Specifically, the pre-needling density is 5-8 needles/inch2The needling depth is 3-8mm, and the needling speed is 8-36 times/minute; the needling density of the main needling is 10-60 needles/inch2The needling depth is 5-15mm, and the needling speed is 360-600 times/min.
Specifically, the thermal bonding method in the step (6) includes the steps of performing gum dipping treatment on the fiber web by using an adhesive in a gum dipping tank, scraping off redundant adhesive through a rubber scraping roller, drying and curing in a drying oven, extruding through a cloth pressing roller after curing, and winding on a core of the cloth rolling paper tube.
Specifically, the dosage of the adhesive is 8% -15%.
Specifically, the binder is an aqueous or solvent sizing material with a solid content of 10-40%.
Specifically, the binder is a phenol resin.
Specifically, the drying and curing are carried out in three temperature zones, namely a low temperature zone, a high temperature zone and a low temperature zone; the temperature of the low-temperature zone is 70-120 ℃; the temperature of the high-temperature zone is 150-180 ℃.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the alkali-free glass fiber non-woven fabric provided by the invention adopts the alkali-free glass fiber chopped fibers with the content of more than 90 as raw materials, and is prepared by a needling method or a thermal bonding method, so that the process is short, the supporting facilities are few, the cost is saved, and the construction period is shortened; the gram weight of the alkali-free glass fiber non-woven fabric is 15-210 g/m2The thickness of the woven cloth is 4-10% thinner than that of the alkali-free glass fiber woven cloth with the same specification, the cloth cover appearance flaws are few, the gum dipping performance is better, the tensile strength is higher, burrs are not easy to generate in tape cutting, the woven cloth can be used on products such as a fire-resistant mica tape for a fire-resistant cable and a fire-resistant mica tape for a motor, and the application value is good.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view showing the production of the alkali-free glass fiber nonwoven fabric of the present invention by a needle punching method.
Reference numerals: 1. laying a net; 2. pre-needling; 3. performing main needling; 4. adjusting tension; 5. and (6) trimming and winding.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Although representative embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the embodiments, but should be defined by the appended claims and equivalents thereof.
The invention provides an alkali-free glass fiber non-woven fabric which is prepared by taking alkali-free glass fiber chopped fibers and a sizing agent as raw materials, wherein the content of the alkali-free glass chopped fibers is more than 90%; the weight of the alkali-free glass fiber non-woven fabric is 15-210 g/m2(ii) a The size is 5-30% of acrylic emulsion or 5-30% of waterborne polyurethane. The manufacturing method comprises the following steps:
(1) raw materials: selecting and preparing alkali-free glass fiber chopped fibers and a sizing agent, wherein the alkali-free glass fiber chopped fibers are not less than 90%;
(2) opening: putting the raw materials into an opener for pre-opening and opening to release the fibers;
(3) feeding: feeding by using a feeding machine;
(4) carding: carding, removing impurities and mixing by a carding machine;
(5) lapping: the combed alkali-free glass fiber chopped fibers enter a net curtain of a net forming machine, the drafting air blown out from a drafting air channel at the upper end of the net curtain and the indoor air at the upper part are sucked away from the lower part of the net by virtue of an air suction channel at the lower part of the net curtain and a suction fan, so that the alkali-free glass fiber chopped fibers are adsorbed on the net curtain to form a uniform fiber net along with the uniform motion of the net curtain, and position-adjustable baffles arranged at the two ends of the net curtain are used for controlling the net forming width and ensuring the neat edges of the fiber net, and the fiber net is the basic structure of the needle-punched non-woven fabric.
The structure design of the web former and the air duct must be matched with each other, so that the fiber web runs stably, the uniform air suction and web formation are ensured, and the gram weight of the fiber web is controlled to be 15-210 g/m2In the range of (a), which is important for the grammage of the final alkali-free glass fiber nonwoven fabric.
(6) Consolidation: reinforcing the fiber net by adopting a needle punching method or a thermal bonding method to prepare alkali-free glass fiber non-woven fabric;
wherein the needle punching method comprises pre-punching and main punching: the pre-needling density is 5-8 needles/inch2The needling depth is 3-8mm, the needling speed is 8-36 times/min, and the needling density of the main needling is 10-60 needles/inch2The needling depth is 5-15mm, the needling speed is 360-;
the thermal bonding method comprises the steps of gluing with an adhesive, wherein the adhesive amount is 8% -15%, the fiber web is subjected to gum dipping through a gum dipping groove, and the adhesive is a water-based or solvent-based glue stock with the solid content of 10% -40%, and is preferably phenolic resin; after gum dipping, scraping redundant gum through five rubber scraping rollers, and drying and solidifying in a drying furnace, wherein the drying is carried out in three temperature areas, namely a low temperature area, a high temperature area and a low temperature area, the temperature of the low temperature area is 70-120 ℃, and the temperature of the high temperature area is 150-; after being dried, the mixture is extruded by a cloth pressing roller with the pressure of 4-8 kilograms and is wound on a cloth rolling paper tube core.
(7) And cutting, curling and warehousing the finished product of the alkali-free glass fiber non-woven fabric.
The effect of the alkali-free glass fiber nonwoven fabric of the present invention is examined by the following specific examples.
Example 1:
in this embodiment, the alkali-free glass fiber nonwoven fabric is prepared by a needle punching method, which comprises the following steps:
(1) raw materials: selecting 100% of EC9 alkali-free glass chopped fiber;
(2) opening: putting the raw materials into an opener for pre-opening and opening to release the fibers;
(3) feeding: feeding by using a feeding machine;
(4) carding: carding, removing impurities and mixing by a carding machine;
(5) lapping: the combed alkali-free glass fiber chopped fibers enter a net curtain of a net forming machine in a net laying device, the drafting air blown out from an air outlet nozzle of a drafting air channel and the indoor air on the upper part of the net curtain are sucked away from the lower part of the net by virtue of an air suction channel and a suction fan, so that the alkali-free glass fiber chopped fibers are adsorbed on the net forming curtain and form uniform fiber nets along with the uniform motion of the net curtain, and position-adjustable baffles arranged at two ends of the net curtain are used for controlling the net forming width and ensuring the net edges to be neat;
(6) consolidation: the fluffy fiber web sent by the web forming machine enters a pre-needling machine, is compacted and has certain strength under the impact of a needle plate and the piercing action of needles, and the density of the pre-needling needles is 5 needles/inch2The depth of the needling is 3 mm, the needling speed is 8 times/min, and then the needling is carried out in a main needling machine, the density of the main needling is 10 needles/inch2The needling depth is 5mm, the needling speed is 360 times/min, and the fiber web is needled and consolidated from top to bottom to obtain the alkali-free glass fiber non-woven fabric;
(7) and cutting, curling and warehousing the finished product of the alkali-free glass fiber non-woven fabric.
The obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Example 2:
an alkali-free glass fiber nonwoven fabric was prepared in the same manner as in example 1, except that 95% of EC9 alkali-free glass fiber chopped fibers and 5% of acrylic emulsion were selected as raw materials;
the obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Example 3:
an alkali-free glass fiber nonwoven fabric was prepared in the same manner as in example 1, except that 90% of EC9 alkali-free glass fiber chopped fibers and 10% of acrylic emulsion were selected as raw materials;
the obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Example 4:
an alkali-free glass fiber nonwoven fabric was produced in the same manner as in example 1, except that the pre-puncture needle density was 6 needles/inch2The needling depth is 3.5 mm, and the needling speed is 9 times/minute; the main needle density is 11 needles/inch2The depth of the needle penetration was 6 mm, and the needle penetration rate was 400 times/min.
The obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Example 5:
an alkali-free glass fiber nonwoven fabric was prepared in the same manner as in example 1, except that 100% of EC11 alkali-free glass fiber chopped fibers were selected as the raw material; the pre-pricking pin density is 7 pins/inch2The needling depth is 6 mm, and the needling speed is 10 times/minute; the main needle density is 12 needles/inch2The depth of the needle penetration was 7 mm, and the needle penetration rate was 500 times/min.
The obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Example 6:
an alkali-free glass fiber nonwoven fabric was prepared in the same manner as in example 1, except that 100% of EC13 alkali-free glass fiber chopped fibers were selected as the raw material; the pre-pricking pin density is 8 pins/inch2The needling depth is 8mm, and the needling speed is 36 times/minute; the main needle density was 60 needles/in 2, the needle depth was 15mm, and the needle speed was 600 times/min.
The obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Example 7:
in this embodiment, the alkali-free glass fiber nonwoven fabric is prepared by a thermal bonding method, which comprises the following steps:
(1) raw materials: selecting 100% of the alkali-free glass chopped fiber of EC 9;
(2) opening: putting the raw materials into an opener for pre-opening and opening to release the fibers;
(3) feeding: feeding by using a feeding machine;
(4) carding: carding, removing impurities and mixing by a carding machine;
(5) lapping: the combed alkali-free glass fiber chopped fibers enter a net curtain of a net forming machine in a net laying device, the drafting air blown out from an air outlet nozzle of a drafting air channel and the indoor air on the upper part of the net curtain are sucked away from the lower part of the net by virtue of an air suction channel and a suction fan, so that the alkali-free glass fiber chopped fibers are adsorbed on the net forming curtain and form uniform fiber nets along with the uniform motion of the net curtain, and position-adjustable baffles arranged at two ends of the net curtain are used for controlling the net forming width and ensuring the net edges to be neat;
(6) consolidation: carrying out gluing treatment by using 12% phenolic resin, and dipping the fiber web by a dipping tank; after gum dipping, scraping redundant gum off through five paths of gum scraping rollers, drying and solidifying in a drying furnace, wherein the drying is carried out in three temperature areas, namely a low temperature area, a high temperature area and a low temperature area, the temperature of the low temperature area is 70 ℃, and the temperature of the high temperature area is 180 ℃; after drying, extruding the mixture by a cloth pressing roller with the pressure of 6 kilograms to prepare alkali-free glass fiber non-woven fabric;
(7) and cutting, curling and warehousing the finished product of the alkali-free glass fiber non-woven fabric.
The obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Example 8:
an alkali-free glass fiber nonwoven fabric was produced in the same manner as in example 7, except that 90% of EC9 alkali-free glass fiber chopped fibers and 10% of acrylic emulsion were selected as raw materials.
The obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Comparative example 1:
an alkali-free glass fiber nonwoven fabric was prepared in the same manner as in example 1, except that 85% of EC9 alkali-free glass fiber chopped fibers and 15% of acrylic emulsion were selected as raw materials;
the obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Comparative example 2:
an alkali-free glass fiber nonwoven fabric was prepared in the same manner as in example 7, except that 85% of EC9 alkali-free glass fiber chopped fibers and 15% of acrylic emulsion were selected as raw materials;
the obtained finished product was subjected to quality inspection, and the results are shown in table 1.
Comparative example 3:
the quality of the finished product obtained by selecting 100% of EC9 chopped alkali-free glass fiber and weaving alkali-free glass fiber cloth by using a traditional loom is tested, and the results are shown in Table 1.
TABLE 1 quality test results of alkali-free glass fiber nonwoven fabrics
As can be seen from table 1, the tear strength of the alkali-free glass fiber non-woven fabric prepared in the embodiment of the present invention and the tear strength of the conventional woven alkali-free glass fiber fabric can satisfy the requirement of the mica tape, but the alkali-free glass fiber non-woven fabric of the present invention has a thickness of 4% to 10% thinner than the conventional woven fabric, and has the advantages of short process, low cost, and few appearance defects of the fabric surface; the results of comparative examples 1 to 3 show that the ratio of the alkali-free glass chopped fibers to the sizing agent in the raw material has an important influence on the quality of the final product, when the content of the alkali-free glass chopped fibers is between 90% and 100%, the alkali-free glass chopped fibers are light in weight and thin in thickness, and the warp-direction tear strength and the weft-direction tear strength can meet the requirements of the subsequent fire-resistant mica tape tensile strength, while as shown by the results of comparative examples 1 and 2, when the content of the alkali-free glass chopped fibers is 85%, and the obtained alkali-free glass fiber non-woven fabric is not suitable for industrial application because the warp-direction tear strength and the weft-direction tear strength are greatly reduced compared with the alkali-free glass fiber non-woven fabric with the content of 90% regardless of needle punching or thermal bonding.
In conclusion, the alkali-free glass fiber non-woven fabric provided by the invention adopts the alkali-free glass fiber chopped fibers with the content of more than 90% as the raw materials and is prepared by a needling method or a thermal bonding method, so that the process is short, supporting facilities are few, the cost is saved, and the construction period is shortened; the gram weight of the alkali-free glass fiber non-woven fabric is 15-210 g/m2Compared with the alkali-free glass fiber woven fabric with the same specification, the alkali-free glass fiber woven fabric is thinner, has light gram weight, less fabric surface appearance flaws, better gum dipping property and higher tensile strength, is not easy to generate burrs when being cut in belt making, can be used on products such as a fire-resistant mica tape for a fire-resistant cable, a fire-resistant mica tape for a motor and the like, and has good application value.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. An alkali-free glass fiber non-woven fabric, which is characterized in that: the glass fiber is prepared by adopting alkali-free glass chopped fibers and a sizing agent as raw materials, wherein the content of the alkali-free glass chopped fibers is not less than 90%; the weight of the alkali-free glass fiber non-woven fabric is 15-210 g/m2。
2. The alkali-free glass fiber nonwoven fabric according to claim 1, wherein: the size is 5-30% of acrylic emulsion or 5-30% of waterborne polyurethane.
3. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 1, comprising the steps of:
(1) raw materials: selecting and preparing alkali-free glass fiber chopped fibers and a sizing agent, wherein the alkali-free glass fiber chopped fibers are more than 90%;
(2) opening: putting the raw materials into an opener for pre-opening and opening to release the fibers;
(3) feeding: feeding by using a feeding machine;
(4) carding: carding, removing impurities and mixing by a carding machine;
(5) lapping: uniformly paving the carded alkali-free glass fiber chopped fibers into a fiber web by using a lapping device, and ensuring the gram weight of the fiber web to be within a specified range;
(6) consolidation: reinforcing the fiber net by adopting a needle punching method or a thermal bonding method to prepare alkali-free glass fiber non-woven fabric;
(7) and cutting, curling and warehousing the finished product of the alkali-free glass fiber non-woven fabric.
4. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 3, wherein: the needling method in the step (6) comprises pre-needling and main needling, and the fiber web is needled and consolidated from top to bottom.
5. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 4, wherein: the pre-needling density is 5-8 needles/inch2The needling depth is 3-8mm, and the needling speed is 8-36 times/minute; the needling density of the main needling is 10-60 needles/inch2The needling depth is 5-15mm, and the needling speed is 360-600 times/min.
6. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 3, wherein: and (6) the thermal bonding method comprises the steps of performing gum dipping treatment on the fiber web by using an adhesive in a gum dipping tank, scraping redundant adhesive by a rubber scraping roller, drying and curing in a drying oven, extruding by a cloth pressing roller after curing, and winding on a core of the rolled cloth paper.
7. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 6, wherein: the dosage of the binder is 8-15%.
8. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 6, wherein: the binder is an aqueous or solvent size with a solid content of 10-40%.
9. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 8, wherein: the binder is a phenolic resin.
10. The method for producing an alkali-free glass fiber nonwoven fabric according to claim 6, wherein: the drying and curing are carried out in three temperature areas, namely a low temperature area, a high temperature area and a low temperature area; the temperature of the low-temperature zone is 70-120 ℃; the temperature of the high-temperature zone is 150-180 ℃.
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