阅读说明：本技术 一种保温隔热板用玄武岩纤维缝纫线及其制备方法 (Basalt fiber sewing thread for heat-insulation board and preparation method thereof ) 是由 余奕发 傅潇丽 金倩瑶 许加阳 王会忠 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种保温隔热板用玄武岩纤维缝纫线及其制备方法。本发明玄武岩纤维缝纫线的CODc不高于500mg/kg,可燃物含量为0.5～2.0％,单丝直径为12～17μm。本发明的制备方法包括如下步骤：选择CODc值不高于2000mg/kg玄武岩矿石；在熔炉中对玄武岩矿石进行熔融拉丝,通过控制氧化/还原气氛,使得玄武岩纤维组分中Fe<Sup>2+</Sup>/Fe<Sup>3+</Sup>摩尔比为0.28～0.56；将得到的玄武岩纤维通过表面浸润剂涂覆,然后烘干,再经退、并两道捻线工序,得到玄武岩纤维缝纫线。本发明的玄武岩纤维缝纫线具有优异的强度、隔热阻燃性、耐碱性和耐久性,且其耐腐蚀性能满足建筑保温隔热板场合。(The invention discloses a basalt fiber sewing thread for a heat-insulating board and a preparation method thereof. The CODC of the basalt fiber sewing thread is not higher than 500mg/kg, the combustible content is 0.5-2.0%, and the monofilament diameter is 12-17 mu m. The preparation method comprises the following steps: selecting basalt ore with CODc value not higher than 2000 mg/kg; basalt convection in a furnacePerforming melt drawing on the ore, and controlling the oxidation/reduction atmosphere to ensure that Fe is contained in the basalt fiber component 2+ /Fe 3+ The molar ratio is 0.28-0.56; and coating the obtained basalt fiber by using a surface impregnating compound, drying, and performing retreating and two-twisting processes to obtain the basalt fiber sewing thread. The basalt fiber sewing thread has excellent strength, heat insulation and flame retardance, alkali resistance and durability, and the corrosion resistance of the basalt fiber sewing thread meets the requirements of occasions of building heat preservation and insulation boards.)

1. The basalt fiber sewing thread for the heat-insulation and heat-insulation plate is characterized in that the CODc value of the basalt fiber sewing thread is not higher than 500mg/kg, the content of combustible substances is 0.5-2.0%, and the diameter of a monofilament is 12-17 mu m.

2. The basalt fiber sewing thread for the heat-insulating board according to claim 1, wherein the basalt fiber sewing thread component contains Fe²⁺/Fe³⁺The molar ratio is 0.28-0.56.

3. The basalt fiber sewing thread for the heat-preservation and insulation board as claimed in claim 1, wherein the linear density of the basalt fiber sewing thread is 264 to 1600 TEX.

4. The basalt fiber sewing thread for a heat-insulating panel according to claim 1, wherein the fracture strength of the basalt fiber sewing thread is 0.65 to 0.90N/Tex.

5. The basalt fiber sewing thread for the heat-insulating and heat-insulating plate according to claim 1, wherein the fracture strength retention rate of the basalt fiber sewing thread is more than 77% after the basalt fiber sewing thread is soaked in a 1mol/L NaOH solution at 60 ℃ for 2 hours.

6. A preparation method of basalt fiber sewing thread for a heat-insulating board is characterized by comprising the following steps:

step A: selecting basalt ore with CODc value not higher than 2000 mg/kg;

and B: melting and drawing the basalt ore in the step A in a smelting furnace, and controlling the oxidation/reduction atmosphere in the smelting furnace to ensure that the obtained basalt fiber component contains Fe²⁺/Fe³⁺The molar ratio is 0.28-0.56;

and C: and D, coating the basalt fiber obtained in the step B by using a surface impregnating compound, drying, and performing retreating and two twisting processes to obtain the basalt fiber sewing thread.

7. The method of claim 6, wherein said basalt ore has a total iron oxide content of not less than 8.0% and an acidity coefficient of not less than 5.5.

8. The production method according to claim 6, wherein the oxidizing atmosphere in step B is an oxygen or air atmosphere; the reducing atmosphere is an atmosphere in which nitrogen or air is not sufficiently supplied.

Technical Field

The invention belongs to the technical field of prefabricated material selection of heat-insulating boards, and particularly relates to a basalt fiber sewing thread for a heat-insulating board and a preparation method thereof.

Background

With the development of the green building industry and the improvement demand of old communities, the building energy-saving technology is changing day by day. The building wall heat preservation mainly comprises three forms of external wall heat preservation, internal wall heat preservation and sandwich heat preservation. The external wall external insulation places the heat preservation in the outside of main part walling, can alleviate the influence of cold bridge, protects main part walling not receive too big temperature deformation stress simultaneously, is the heat preservation way of using most extensively, the state is advocated vigorously at present. An external thermal insulation system (external thermal insulation system) is composed of an insulation layer, a protective layer and fixing materials (adhesive, anchoring parts and the like) and is suitable for a general name of a non-bearing insulation structure installed on the outer surface of an outer wall; mainly comprises a thin plastering system and a curtain wall heat preservation system.

Rock wool for heat preservation and heat insulation is often required to be combined with inorganic fiber mesh cloth for use, the traditional combination process is that an adhesive or a plastering adhesive is used for bonding, and the adhesive material is inorganic and organic.

At present, basalt fibers are used as sewing threads, and the traditional processes mainly comprise two types: firstly, the fiber is blended with organic fiber, such as CN203270156U utility model, which comprises three fibers of basalt fiber, wood fiber, polylactic acid corn fiber and the like, the process is complex and is not fire-resistant and corrosive; secondly, spun yarns with the diameter of less than 7 microns are adopted, for example, the diameter of the patent of CN 102041591A is 3.5-5.5 microns, the spun yarns are dipped for the second time, the diameter of the precursor of the CN 201420130Y utility model is less than or equal to 6 microns, the spun yarns are mainly applied to soft occasions such as fabrics or felts, the diameter of the precursor of the CN201981324U utility model is less than or equal to 5.5 microns, and the surface of the spun yarns has a sintering layer except for the dipping layer; small filament diameters result in low wire draw output and are not practical at high cost, and secondary processing increases combustible content and reduces softness. The traditional process does not consider the particularity of the rock wool sewing occasion for heat preservation and insulation, and can not meet the requirements of low practical cost, heat insulation and flame retardance of buildings, alkali resistance and durability of the buildings and the like.

The basalt fiber sewing thread for the heat-insulating plate has the advantages of adaptability to sewability and breaking strength of rock wool, adaptability to durability and corrosion resistance of a building energy-saving environment, controllable cost, capability of realizing large-scale continuous production, belonging to the blue sea market, and good practicability and market prospect.

Disclosure of Invention

The invention aims to provide a basalt fiber sewing thread for a heat-insulating plate and a preparation method thereof. The basalt fiber sewing thread has the advantages of good alkali resistance, high breaking strength, good flame retardant and heat insulation performance, good durability and the like, and the preparation method has low cost and can be used for large-scale continuous production.

In order to achieve the purpose, the invention adopts the following technical scheme:

the basalt fiber sewing thread for the heat-insulating and heat-insulating plate is characterized in that the CODC of the basalt fiber sewing thread is not higher than 500mg/kg, the content of combustible substances is 0.5-2.0%, and the diameter of a monofilament is 12-17 mu m.

Further, Fe in the basalt fiber sewing thread component²⁺/Fe³⁺The molar ratio is 0.28-0.56.

Further, the linear density of the basalt fiber sewing thread is 264-1600 TEX.

Further, the breaking strength of the basalt fiber sewing thread is 0.65-0.90N/Tex.

Further, after the basalt fiber sewing thread is soaked in 1mol/L NaOH solution at 60 ℃ for 2 hours, the breaking strength retention rate reaches more than 77%.

The invention also provides a preparation method of the basalt fiber sewing thread for the heat-insulating board, which comprises the following steps:

step A: selecting basalt ore with CODc value not higher than 2000 mg/kg;

and B: melting and drawing the basalt ore in the step A in a smelting furnace, and controlling the oxidation/reduction atmosphere in the smelting furnace to ensure that the obtained basalt fiber component contains Fe²⁺/Fe³⁺The molar ratio is 0.28-0.56;

and C: and D, coating the basalt fiber obtained in the step B by using a surface impregnating compound, drying, and performing retreating and two twisting processes to obtain the basalt fiber sewing thread.

Further, in the preparation method, the total content of iron oxide in the basalt ore is not less than 8.0%, and the acidity coefficient is not less than 5.5.

Further, in the above preparation method, the oxidizing atmosphere in the step B is an oxygen or air atmosphere; the reducing atmosphere is an atmosphere in which nitrogen or air is not sufficiently supplied.

Further, in the above preparation method, the surface treating compound of step C includes an epoxy emulsion, a lipid compound, and any one of 3-aminopropyltriethoxysilane, γ -glycidoxypropyltrimethoxysilane, and 3- (methacryloyloxy) propyltrimethoxysilane.

Compared with the traditional sewing thread, the basalt fiber sewing thread has the following advantages:

1. combination of alkali resistance and breaking strength: controlling Fe of sewing thread²⁺/Fe³⁺The molar ratio is not less than 0.28, so that the breaking strength is not less than 0.65N/Tex; fe²⁺/Fe³⁺The molar ratio is not higher than 0.56, so that the breaking strength retention rate can reach more than 77 percent after the material is soaked in 1mol/L NaOH solution at 60 ℃ for 2 hours.

2. Has practicability and low cost: when the diameter of the monofilament is controlled to be 12-17 mu m, the sewing thread has good wear resistance, flexibility and sewability, and the thread density can be realized to be 264-1600 TEX by twisting the thread once, so that the sewing connection between the rock wool and the mesh cloth with the thickness of 10-200 mm is met; the diameter of the single silk of the traditional basalt fiber sewing thread is usually below 7 mu m, the cost is doubled to be increased in quantity level, and the large-scale popularization and application are difficult.

3. Flame-retardant and heat-insulating properties: the outer layer of the invention does not need treatment such as a protective layer or secondary coating, the content of combustible is 0.5-2.0%, the fireproof performance reaches the incombustible A level, and the heat conductivity coefficient is 0.029-0.036; the traditional basalt fiber sewing thread is often combined with organic fiber or needs a secondary organic coating, so that the combustible content is greatly improved, the fire-proof grade is low, and the cost is increased.

4. Durability: according to the invention, by controlling the CODC values of the raw materials and the product, the total content of the iron oxide is not less than 8.0%, and the acidity coefficient is not less than 5.5, so that the water resistance and weather resistance of the product are greatly higher than those of a rock wool body, and the requirements of reinforcement and combination are met.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.

【CODc】

CODC is the amount of oxidant consumed to oxidize 1kg of reducing substances in the mineral raw materials or the batch under certain conditions, and is expressed in terms of C.

The total content of iron oxide in the selected basalt ore is not less than 8.0%, and the acidity coefficient is not less than 5.5. In order to measure CODC of basalt ore, the basalt ore is ground to pass through a 120-mesh sieve, and fine basalt ore powder is obtained to be measured in CODC value.

In the invention, the basalt fiber is ground and ground to pass through a 120-mesh sieve, and then the CODc value is measured.

In the invention, the basalt ore and the basalt fiber are subjected to CODC determination according to the building material industry standard JC/T2156-2012 of the people's republic of China.

[ detection of iron content ]

Fe in basalt ore or basalt fiber in the invention₂O₃The content is measured according to GB/T14506.5-2010, and the content of FeO is measured according to GB/T14506.14-2010.

[ PRODUCTION OF basalt FIBER SEWING THREAD ]

A preparation method of basalt fiber sewing thread for a heat-insulating board comprises the following steps:

step A: selecting basalt ore with CODc value not higher than 2000 mg/kg;

and B: melting and drawing the basalt ore in the step A in a smelting furnace, and controlling the oxidation/reduction atmosphere in the smelting furnace to ensure that the obtained basalt fiber component contains Fe²⁺/Fe³⁺The molar ratio is 0.28-0.56;

and C: and D, coating the basalt fiber obtained in the step B with a surface impregnating compound through an oiling device, drying, and performing retreating and two twisting processes to obtain the basalt fiber sewing thread.

The basalt fiber is prepared by using basalt ore as a raw material, and is characterized by containing iron oxide in the components and presenting bronze metallic luster in appearance. Iron oxide having mainly FeO and Fe₂O₃Two forms exist, typically FeO/Fe₂O₃The higher the ratio of (a) is, the higher the breaking strength of the fiber is. Because the percentage content of FeO in most basalt ores is close to or higher than that of Fe₂O₃，Fe²⁺/Fe³⁺The molar ratio is generally greater than 0.8; therefore, the traditional basalt fiber production process does not encourage Fe²⁺To Fe³⁺And the alkali resistance of the traditional basalt fiber sewing thread is low or later sheath improvement is required. At another angle, Fe of the surface³⁺Can form Fe (OH)₃The alkali corrosion resistant protective film is helpful for improving the alkali resistance of the fiber, and Fe²⁺There is no similar function.

Hair brushThe CODc value and Fe of the fiber are realized by controlling the raw material composition, the CODc value and the melting atmosphere²⁺/Fe³⁺The mole ratio is in a specific range, so that the basalt fiber simultaneously obtains excellent strength, heat insulation and flame retardance, alkali resistance and durability, and meanwhile, the control of the acidity coefficient ensures that the corrosion resistance of the basalt fiber meets the requirement of the occasion of building heat insulation boards, and the basalt fiber can be used for sewing connection of rock wool and inorganic fiber mesh cloth.

In a preferred embodiment of the invention, the total iron oxide content of the basalt ore is not less than 8.0%, and the acidity coefficient is not less than 5.5.

In a preferred embodiment of the present invention, the oxidizing atmosphere in step B is an oxygen or air atmosphere; the reducing atmosphere is an atmosphere in which nitrogen or air is not sufficiently supplied.

In a preferred embodiment of the present invention, the surface wetting agent of step C is selected from, but not limited to, epoxy emulsion, lipid compound and any one of 3-aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane and 3- (methacryloyloxy) propyltrimethoxysilane.

[ basalt fiber Sewing thread ]

The basalt fiber sewing thread for the heat-insulating and heat-insulating plate has the advantages that the CODC of the basalt fiber sewing thread is not higher than 500mg/kg, the content of combustible substances is 0.5-2.0%, and the diameter of a monofilament is 12-17 mu m, so that the basalt fiber sewing thread has good fireproof performance, the fireproof performance reaches the incombustible A level through detection, the fireproof grade is high, the basalt fiber sewing thread is suitable for sewing rock wool with the thickness of 10-200 mm, and the sewing cost is reduced.

In a preferred embodiment of the present invention, the basalt fiber sewing thread component is Fe²⁺/Fe³⁺The molar ratio is 0.28-0.56

In a preferred embodiment of the invention, the linear density of the basalt fiber sewing thread is 264-1600 TEX.

In a preferred embodiment of the present invention, the breaking strength of the basalt fiber sewing thread is 0.65 to 0.90N/Tex; after being soaked in 1mol/L NaOH solution at 60 ℃ for 2 hours, the breaking strength retention rate reaches more than 77 percent, and the composite material has excellent strength and alkali resistance, meets the requirement of building heat-insulating partition plate occasions, and can be used for sewing and connecting rock wool and inorganic fiber mesh cloth.