阅读说明：本技术 一种提高扁丝干网抗污稳定性的加工方法 (Processing method for improving anti-pollution stability of flat filament dry net ) 是由 刘林 于 2019-08-27 设计创作，主要内容包括：本发明属于扁丝干网加工技术领域,具体涉及一种提高扁丝干网抗污稳定性的加工方法,扁丝干网基材为1.5层结构,经线和纬线的材质均为高抗水解聚酯单丝,采用热风回缩式定型方式制备；制备方法包括：防污涂料制备、扁丝干网基材预处理和浸渍处理。本发明相比现有技术具有以下优点：本申请由防污涂料处理后的扁丝干网基材表面具有显著的成膜性和防污性能,在受高压冲洗的情况下,污物容易与扁丝干网分离,且其涂膜稳定性好,保护扁丝干网不被磨损,保持透气性、纸接触性以及透热性不受损坏,延长扁丝干网的使用寿命,使其在使用过程中保持尺寸稳定性。(The invention belongs to the technical field of processing of flat filament drying nets, and particularly relates to a processing method for improving the anti-fouling stability of a flat filament drying net, wherein the base material of the flat filament drying net is of a 1.5-layer structure, and warps and wefts are made of high hydrolysis-resistant polyester monofilaments and are prepared in a hot air retraction type shaping mode; the preparation method comprises the following steps: preparing an antifouling paint, pretreating a flat filament dry net substrate and performing immersion treatment. Compared with the prior art, the invention has the following advantages: the surface of the flat filament drying net substrate treated by the antifouling paint has obvious film forming property and antifouling property, under the condition of high-pressure washing, dirt is easy to separate from the flat filament drying net, the film coating stability is good, the flat filament drying net is protected from being abraded, the air permeability, the paper contact property and the heat permeability are kept from being damaged, the service life of the flat filament drying net is prolonged, and the size stability of the flat filament drying net is kept in the using process.)

1. A processing method for improving the anti-fouling stability of a flat filament drying net is characterized in that a base material of the flat filament drying net is of a 1.5-layer structure, and warps and wefts are made of high hydrolysis-resistant polyester monofilaments and are prepared in a hot air retraction type shaping mode; the method is characterized by comprising the following steps:

(1) preparation of antifouling paint

(1.1) modifying boron glass powder, namely adding 14-18 parts by weight of octyl silane coupling agent and 3-7 parts by weight of mercaptosilane coupling agent into 100 parts by weight of 60% ethanol solution, stirring for 5-10 minutes at a stirring speed of 600 plus 800 revolutions per minute, heating to 65-75 ℃, adding 12-16 parts by weight of boron glass powder, 1-3 parts by weight of titanium dioxide sol and 3-5 parts by weight of N, N-dicyclohexyl amine methylurea, reacting for 3-4 hours under an ultrasonic condition, filtering and drying to obtain modified boron glass powder for later use;

(1.2) mixing 22-26 parts of polyvinylidene fluoride, 6-10 parts of vinyl acetate, 3-5 parts of organic silicon resin containing silicon hydroxyl, 10-14 parts of modified boron glass powder, 1-3 parts of curing agent, 2-3 parts of ethyl acetate, 1-2 parts of cationic emulsifier, 60-80 parts of diluent and 4-7 parts of cosolvent according to parts by weight, and fully stirring to obtain the antifouling paint;

(2) pretreating a flat filament dry net substrate, namely soaking the flat filament dry net substrate in hydrochloric acid with the mass concentration of 8-10% for 10-15 minutes, drying, then flatly paving the flat filament dry net substrate, and respectively irradiating two surfaces of the flat filament dry net substrate by using an ultraviolet lamp with the power of 800W and the wavelength of 300nm, wherein the distance between the ultraviolet lamp and the upper surface of the flat filament dry net substrate is 20cm, and the treatment time of each surface is 6-10 minutes;

(3) dipping the pretreated flat filament dry net substrate into the coating, stirring for 30-40 seconds, draining, and treating for 3-5 minutes in an inert atmosphere at the temperature of 200-300 ℃ to obtain the coating.

2. The process of claim 1, wherein the high hydrolysis resistance polyester monofilament has a breaking strength of > 590 MPa; the warp is a flat filament, the length-width ratio of the rectangular size of the longitudinal section of the flat filament is not less than 1.8, and the weft is a round filament.

3. The process of claim 2, wherein the rectangular dimensions of the longitudinal section of the flat filament are 0.95mm by 0.45 mm; the weft is including leveling the upper weft that supports 0.5 layer and stabilizing the lower floor's weft that the bottom was used, and the diameter of upper weft is 0.5mm, and the diameter of lower floor's weft is 0.9 mm.

4. The process of claim 1, wherein said octyl silane coupling agent is one of octyl trimethoxysilane, octyl triethoxysilane, isooctyl triethoxysilane, and n-decyl trimethoxysilane; the mercaptosilane coupling agent is one of 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldiethoxysilane and 3-mercaptopropylmethyldimethoxysilane.

5. The process of claim 1, wherein the titania sol is a nano anatase titania hydrosol or a nano rutile titania sol.

6. The process of claim 1, wherein the hydroxyl groups on the silicon hydroxyl groups of the silicone resin containing silicon hydroxyl groups account for 6-8% of the total amount of the silicone resin; the organic silicon resin is polyalkyl aryl organic silicon resin.

7. The process of claim 1, wherein the diluent is xylene mixed with any one of cyclohexanone, acetone, and butanone; the cosolvent is prepared by mixing acetyl dimethylamine and 2-methoxy ethyl ether in a weight ratio of 4-7: 1; the cationic emulsifier is dodecyl trimethyl ammonium bromide or hexadecyl trimethyl ammonium bromide; the curing agent is prepared by mixing ammonium chloride and urea in a weight ratio of 3: 1.

8. The process of claim 1, wherein the density of warp threads of the substrate of the flat filament dry net is 10-14 threads/cm, and the total density of weft threads is 12-15 threads/cm.

Technical Field

The invention belongs to the technical field of processing of flat filament drying nets, and particularly relates to a processing method for improving the anti-fouling stability of a flat filament drying net.

Background

The standard definition is carried out on the conventional flat filament dry net in China in the current national standard GB/T26456-2011, and for a 1.5-layer profiled filament drying net, the warp threads are mainly 0.56 multiplied by 0.38mm, and the diameter of the weft threads is not more than 0.70 mm; the warp threads of the 1.0-layer profiled yarn drying net YGWD11904-380 are 0.88 mm multiplied by 0.44mm, and the weft threads are 0.90 mm. The 1.5-layer structure meets the requirement of high-speed packaging paper on stability, and the problems of poor stability, low strength, large deformation and the like are caused during high-speed operation due to small warp size; the 1.0 layer structure has thick warp and high strength, and because the structure is single and the ventilation is large, net marks, paper shaking and package are easy to form on wet paper. The main raw material of the flat filament drying net with the 1.5-layer structure is high hydrolysis-resistant polyester monofilament, how to further increase the contact area and the flatness is a problem to be further researched, the water resistance of the high hydrolysis-resistant polyester monofilament reaches a corresponding standard, but in practical application, the flat filament drying net is found to have serious pollution problems due to the fact that old paper is increasingly used in paper production, the pollution types comprise resin, oil, grease, tar, hot melt, pulp, viscous dirt, plastic binder and other dirt, the dirt size is usually smaller than 150 mu m, the dirt is easy to form pollution on the net surface, particularly the cross joint of a warp and a weft of the drying net, the high hydrolysis-resistant polyester monofilament is easy to be compatible, if the cleaning effect is poor if the cleaning is low-pressure, if the cleaning is high-pressure cleaning, the cleaning is easy to be carried out, and the abrasion is accelerated, so that the net surface is easy to be dirty; the dirt adhesion can also damage the performance of the flat filament dry net, such as air permeability, paper contact property, heat permeability and the like, can prevent the paper web from being uniformly and completely conveyed, increases the energy required by drying, reduces the service life of the flat filament dry net, and has great influence on the later printability of the paper at the corresponding position; in order to change the situation, the application document with the application number of 2012100674895 provides a method for improving the hydrophilicity of a polyester forming net, which comprises heating the polyester forming net, atomizing the polyester forming net into a gasified state by using a hydrophilic polymer chemical solution, spraying the atomized polyester forming net onto the surfaces of the polyester forming net filaments, and then carrying out secondary heating setting, wherein the hydrophilic chemical solution is a group polymer solution, a hydrophilic monomer solution and a homopolymer solution thereof; the hydrophilicity of the surface of the polyester forming net is improved through surface treatment, the adsorption of the polyester forming net to hydrophobic substances such as resin and the like is reduced, and further the cleanability and the drainability of the traditional polyester forming net are improved.

Polyvinylidene fluoride is a highly non-reactive thermoplastic fluorine-containing polymer, can be synthesized through the polymerization reaction of 1, 1-difluoroethylene, has low density, is suitable for occasions needing solvent resistance and acid-base corrosion resistance, has excellent mechanical property, creep resistance, high and low temperature resistance, weather resistance and low flammability, is usually used in the fields of petrifaction, metallurgy, pharmacy, construction, lithium batteries, water treatment, military industry, aerospace and the like, is usually used as building coating or coil coating when used as coating, and has no related content of improving the stain resistance of a polyester forming net by using polyvinylidene fluoride as a raw material in the prior art.

Disclosure of Invention

The invention aims to provide a processing method for improving the anti-pollution stability of a flat filament dry net aiming at the existing problems.

The invention is realized by the following technical scheme: a processing method for improving the anti-fouling stability of a flat filament drying net is characterized in that a base material of the flat filament drying net is of a 1.5-layer structure, warps and wefts are made of high-hydrolysis-resistance polyester monofilaments, the water resistance of the warps and the wefts meets the high-level standard of the relevant international standard, the flat filament drying net is prepared in a hot air retraction type setting mode, the density of the warps of the base material of the flat filament drying net is 10-14/cm, the total density of the wefts is 12-15/cm, the air permeability control is detected to be less than or equal to 250cfm under the air pressure of 125Pa, and the setting process adopts an automatic and manual double detection mode to ensure that the swing of a set; the method comprises the following steps:

(1) preparation of antifouling paint

(1.1) modifying boron glass powder, namely adding 14-18 parts by weight of octyl silane coupling agent and 3-7 parts by weight of mercaptosilane coupling agent into 100 parts by weight of 60% ethanol solution, stirring for 5-10 minutes at a stirring speed of 600 plus 800 revolutions per minute, heating to 65-75 ℃, adding 12-16 parts by weight of boron glass powder, 1-3 parts by weight of titanium dioxide sol and 3-5 parts by weight of N, N-dicyclohexyl amine methylurea, reacting for 3-4 hours under an ultrasonic condition, filtering and drying to obtain modified boron glass powder for later use;

(1.2) mixing 22-26 parts of polyvinylidene fluoride, 6-10 parts of vinyl acetate, 3-5 parts of organic silicon resin containing silicon hydroxyl, 10-14 parts of modified boron glass powder, 1-3 parts of curing agent, 2-3 parts of ethyl acetate, 1-2 parts of cationic emulsifier, 60-80 parts of diluent and 4-7 parts of cosolvent according to parts by weight, and fully stirring to obtain the antifouling paint;

(2) pretreating a flat filament dry net substrate, namely soaking the flat filament dry net substrate in hydrochloric acid with the mass concentration of 8-10% for 10-15 minutes, drying, then flatly paving the flat filament dry net substrate, and respectively irradiating two surfaces of the flat filament dry net substrate by using an ultraviolet lamp with the power of 800W and the wavelength of 300nm, wherein the distance between the ultraviolet lamp and the upper surface of the flat filament dry net substrate is 20cm, and the treatment time of each surface is 6-10 minutes;

(3) dipping the pretreated flat filament dry net substrate into the coating, stirring for 30-40 seconds, draining, and treating for 3-5 minutes in an inert atmosphere at the temperature of 200-300 ℃ to obtain the coating.

The breaking strength of the high hydrolysis resistance polyester monofilament is more than 590 MPa; the warp is a flat filament, the length-width ratio of the rectangular size of the longitudinal section of the flat filament is not less than 1.8, and the weft is a round filament.

Preferably, the rectangular size of the longitudinal section of the flat wire is 0.95mm multiplied by 0.45 mm; the weft is including leveling the upper weft that supports 0.5 layer and stabilizing the lower floor's weft that the bottom was used, and the diameter of upper weft is 0.5mm, and the diameter of lower floor's weft is 0.9 mm.

Preferably, the octyl silane coupling agent is one of octyl trimethoxysilane, octyl triethoxysilane, isooctyl triethoxysilane and n-decyl trimethoxysilane; the mercaptosilane coupling agent is one of 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldiethoxysilane and 3-mercaptopropylmethyldimethoxysilane.

Preferably, the titanium dioxide sol is nano anatase type titanium dioxide hydrosol or nano rutile type titanium dioxide sol.

Preferably, the hydroxyl groups on the silicon hydroxyl groups in the silicone resin containing the silicon hydroxyl groups account for 6-8% of the total amount of the silicone resin; the organic silicon resin is polyalkyl aryl organic silicon resin.

Preferably, the diluent is obtained by mixing any one of xylene and cyclohexanone, acetone and butanone; the cosolvent is prepared by mixing acetyl dimethylamine and 2-methoxy ethyl ether in a weight ratio of 4-7: 1; the cationic emulsifier is dodecyl trimethyl ammonium bromide or hexadecyl trimethyl ammonium bromide; the curing agent is prepared by mixing ammonium chloride and urea in a weight ratio of 3: 1.

The octyl silane coupling agent is usually used for harbor engineering and has better anticorrosion effect and durability; the mercapto silane coupling agent has oxidation resistance, can enhance the adhesion between the filler and the high polymer material, and can also enhance the mechanical property of the coating.

The melting point of the boron glass powder is higher than that of common glass powder, and the boron glass powder is mainly used for preventing oxidation, and can reduce the shrinkage of a bonding agent and improve the strength and bonding strength of the bonding agent under the action of the boron glass powder and the bonding agent.

Compared with the prior art, the invention has the following advantages: according to the method, the surface of the flat filament dry net substrate is pretreated, so that the surface energy of the flat filament dry net substrate can be enhanced, and the antifouling paint and the flat filament dry net substrate can be better combined; the antifouling paint takes polyvinylidene fluoride, vinyl acetate and organic silicon resin containing silicon hydroxyl as main raw materials, can generate condensation reaction after the coating is cured to form a net-shaped polymer network, and compared with the method of singly using polyvinylidene fluoride, the antifouling paint can improve the binding performance and stability of the coating, avoid adsorbing dirt and expand the application range of polyvinylidene fluoride; the modified boron glass powder can be uniformly distributed in the coating while maintaining the excellent performance of the modified boron glass powder through modification, so that the surface of the coating is microscopically in a rough structure, liquid drops are not easy to permeate, the antifouling performance is enhanced, and the weather resistance and the mechanical strength of the coating are improved.

Drawings

FIG. 1 is a schematic representation of the warp yarn structure of the present invention.

FIG. 2 is a cross-hatch schematic of a flat filament dryer.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

A processing method for improving the anti-pollution stability of a flat filament dry net comprises the following steps:

1. preparation of flat filament dry net

The base material of the flat filament dry net is of a 1.5-layer structure, the warp and weft are made of high hydrolysis-resistant polyester monofilaments, the water resistance of the warps meets the high-grade standard of the relevant international standard, the warps are prepared in a hot air retraction type shaping mode, and the breaking strength of the high hydrolysis-resistant polyester monofilaments is more than 590 MPa; wherein the warp is flat filament, the structure is shown in figure 1, and the rectangular dimension of the longitudinal section is 0.95mm multiplied by 0.45 mm; the wefts comprise upper wefts for flatly supporting 0.5 layers and lower wefts for stabilizing the bottom layer, the diameter of the upper wefts is 0.5mm, and the diameter of the lower wefts is 0.9 mm; in the structure, the warp threads penetrate through the thick weft thread with the thickness of 0.90mm of the bottom layer to form a stable base layer; meanwhile, the warp threads penetrate through the upper layer weft threads which are 0.50mm above the oblique direction to form a surface layer with 0.5 layer; the reticulate pattern structure of the flat filament dry net is shown in figure 2, because the structure is 1.5 layers, the upper layer weft is above the lower layer weft, and because of the different sizes of the upper layer weft and the lower layer weft, the large oblique open holes are formed after the sizing treatment, so that the flatness of the surface layer and the large strength of the bottom layer are ensured. The high strength of the net body is ensured from the structure of the product; the density of warp threads of the base material of the flat filament dry net is 10-14/cm, the total density of weft threads is 12-15/cm, the air permeability is detected to be less than or equal to 250cfm under the air pressure of 125Pa, and the automatic and manual double detection mode is adopted in the shaping process to ensure that the swing of a shaped product is small and the tension and the size of the whole warp thread are stable;

2. antifouling treatment of flat filament drying net

(1) Preparation of antifouling paint

(1.1) modifying boron glass powder, namely adding 14-18 parts by weight of octyl silane coupling agent and 3-7 parts by weight of mercaptosilane coupling agent into 100 parts by weight of 60% ethanol solution, stirring for 5-10 minutes at a stirring speed of 600 plus 800 revolutions per minute, heating to 65-75 ℃, adding 12-16 parts by weight of boron glass powder, 1-3 parts by weight of titanium dioxide sol and 3-5 parts by weight of N, N-dicyclohexyl amine methylurea, reacting for 3-4 hours under an ultrasonic condition, filtering and drying to obtain modified boron glass powder for later use;

(1.2) mixing 22-26 parts of polyvinylidene fluoride, 6-10 parts of vinyl acetate, 3-5 parts of organic silicon resin containing silicon hydroxyl, 10-14 parts of modified boron glass powder, 1-3 parts of curing agent, 2-3 parts of ethyl acetate, 1-2 parts of cationic emulsifier, 60-80 parts of diluent and 4-7 parts of cosolvent according to parts by weight, and fully stirring to obtain the antifouling paint;

the octyl silane coupling agent and the mercapto silane coupling agent are purchased from Longkai chemical company Limited in Guangzhou;

(2) pretreating a flat filament dry net substrate, namely soaking the flat filament dry net substrate in hydrochloric acid with the mass concentration of 8-10% for 10-15 minutes, drying, then flatly paving the flat filament dry net substrate, and respectively irradiating two surfaces of the flat filament dry net substrate by using an ultraviolet lamp with the power of 800W and the wavelength of 300nm, wherein the distance between the ultraviolet lamp and the upper surface of the flat filament dry net substrate is 20cm, and the treatment time of each surface is 6-10 minutes;

(3) dipping the pretreated flat filament dry net substrate into the coating, stirring for 30-40 seconds, draining, and treating for 3-5 minutes in an inert atmosphere at the temperature of 200-;

3. network edge and interface enhancement processing

The net edge adopts PPS flat yarn or PET wear-resistant multifilament, warp according to the requirement of specification through calculating at weaving in-process net edge portion: the wear-resistant wire is prepared from the following raw materials in percentage by weight: 1. 2: 1 or 1: 2, finally ensuring that the width of the mesh edge of the wear-resistant warp threads is not less than 70 mm. Can be higher than the wire side a little after the wear-resisting line is stereotyped and is handled, glue or PP through AB glue infiltration dictyosome, guarantee that the glue film height highly is unanimous with the wear-resisting line height, improved the wearing and tearing thickness of glue film, increase the wear resistance of limit portion and then reduce the pollution of filth simultaneously from wire rod, glue film two aspects (the easy clean nature of glue film is higher than the easy clean nature of dictyosome far away).

The net edge is subjected to double-warp hot melting edge treatment, so that the net edge is smooth and has a wear-resistant edge of 1-3mm, and the wire and the edge are not easy to tear under the collision of the edge blocking device of the high-speed paper machine.

The connector adopts PEEK spiral ring monofilament or self-generated high hydrolysis resistance monofilament winding ring, and 2-3 rings on each side of the net connector adopt a back-penetrating net body reinforcing mode to reduce the risk of ring tearing. The weft at the joint of the spiral ring and the net body adopts a mode of replacing thin weft, so that the height difference between the position and the net body is reduced, a gentle ascending mode is formed, and more loop wires are lower than the net body; the spiral ring uses the patent clamping ring technique to handle the back ring and the handing-over department position of dictyosome is the same or is higher than a little, can effectively reduce the interface ring use because of the intensity reduction problem that wearing and tearing lead to, ensures the net and uses the intensity in later stage.