Chemical adhesive modified polyester filament non-woven fabric for drain board filter membrane and preparation method of chemical adhesive modified polyester filament non-woven fabric

Abstract

The invention relates to a chemical adhesive modified polyester filament non-woven fabric for a drain board filter membrane and a preparation method of the chemical adhesive modified polyester filament non-woven fabric, and belongs to the technical field of textile production. The chemical adhesive modified polyester filament non-woven fabric for the drain board filter membrane comprises the following components in percentage by mass: 75-80% of a polyester filament fiber net and 20-25% of chemical adhesive, the chemical glue is attached to the surface of the polyester filament fiber, and the chemical glue comprises an acrylate adhesive and a curing agent. According to the method, the polyester filament fiber non-woven fabric is subjected to sizing treatment by adopting an acrylate adhesive, and a compact hydrophobic layer is formed on the surface of the polyester filament fiber after drying, so that water flow is facilitated, and the stiffness and the tensile property of a filter membrane product are improved; the combination of hot rolling shaping and chemical glue coating processes is beneficial to reducing the production energy consumption under the condition of ensuring the fiber bonding strength; the prepared product has excellent functions of deformation resistance, high permeability, strength attenuation resistance and the like, and can adapt to various use environments.

Description

Technical Field

[0001] This invention relates to the field of textile production technology, specifically to a chemically modified polyester filament nonwoven fabric for drainage board filter membranes and its preparation method. Background Technology

[0002] Nonwoven fabric, also known as non-woven cloth, is a type of fabric that does not require spinning or weaving. Instead, it is made by arranging short or long textile fibers in a directional or random manner to form a web structure, which is then reinforced by mechanical, thermal bonding, or chemical methods. It is a new generation of environmentally friendly material with advantages such as breathability, flexibility, light weight, easy decomposition, rich colors, low price, and recyclability. It has wide applications in fields such as smart wearables, artificial intelligence, and aerospace.

[0003] Currently, the sieve materials for existing drainage board filter membrane products are mainly short-fiber geotextiles and thermally bonded nonwoven fabrics (e.g., polypropylene or polyester), which heavily rely on fiber entanglement or thermal bonding technologies. However, short-fiber geotextiles and thermally bonded nonwoven fabrics are prone to clogging, and these traditional filter membranes have a wide pore size distribution, making O95 control inaccurate. Furthermore, because thermally bonded nonwoven fabrics use fiber melt bonding, the bonding force between fibers decreases after immersion in water, leading to a reduction in material performance. For example, polypropylene fibers are susceptible to microbial degradation and hydrolysis, causing a decline in product indicators. In addition, the thermal bonding temperature required during the production of thermally bonded nonwoven fabrics needs to reach above 200°C, resulting in high energy consumption and thus high production costs for drainage board filter membrane products.

[0004] Therefore, it is necessary to develop new materials for drainage board filter membranes to improve the performance and production cost of traditional drainage board filter membrane products and enhance their market competitiveness. Summary of the Invention

[0005] In view of this, the present invention provides a chemically modified polyester filament nonwoven fabric for drainage board filter membranes and its preparation method. The nonwoven fabric is prepared using polyester filaments. By changing the needle punching process and adding a chemical adhesive application process, the performance and production cost of traditional drainage board filter membrane products are improved, thereby enhancing the market competitiveness of the products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] In a first aspect, the present invention provides a chemically modified polyester filament nonwoven fabric for drainage board filter membranes, comprising, by weight percentage, 75-80% (e.g., 76% or 78%) of polyester filament fiber web and 20%-25% (e.g., 22% or 24%) of chemical adhesive, wherein the chemical adhesive is adhered to the surface of the polyester filament fibers; the chemical adhesive comprises an acrylic adhesive and a curing agent.

[0008] In this invention, both the acrylic adhesive and the curing agent are commercially available products conventional in the art. Optionally, the acrylic adhesive brand includes either Badifu or Hongpu; the curing agent includes Baolijia additive, model BLJ-6060A.

[0009] Optionally, the mass ratio of the acrylic adhesive to the curing agent is 25:1.

[0010] Optionally, the basis weight of the chemically modified polyester filament nonwoven fabric is 100–120 g / m². 2 .

[0011] Optionally, the equivalent pore size O of the drainage board filter membrane is obtained by using chemically modified polyester filament nonwoven fabric. 95 The diameter is 0.07–0.13 mm, preferably 0.10–0.13 mm, and the permeability coefficient k ≥ 5 × 10⁻⁶. -2 cm / s, dry longitudinal strength ≥30N / cm, 24h wet transverse strength ≥25N / cm.

[0012] In this invention, in the chemically modified polyester filament nonwoven fabric for drainage board filter membranes, both the polyester filament fiber web and the acrylate adhesive have ester structures, which can effectively combine with each other to enhance the bonding strength between the polyester filament fibers. The acrylate adhesive also has an organic long-chain structure, which forms a tight hydrophobic layer on the surface of the polyester filament fiber web, which helps to prevent the hydrolysis of the polyester filament fibers by water and prevents the degradation of the polyester filament fibers by microorganisms, thus improving the performance of the drainage board filter membrane product.

[0013] Secondly, the present invention provides a method for preparing the above-mentioned chemically modified polyester filament nonwoven fabric for drainage board filter membrane, comprising the following steps:

[0014] Step 1: The polyester chips are subjected to crystallization drying, melt spinning, cooling stretching, filament separation and web laying, needle punching reinforcement, round web shaping and hot rolling to obtain polyester filament fiber nonwoven fabric;

[0015] Step 2: Impregnate and dry the polyester filament nonwoven fabric with a chemical adhesive solution (including impregnation finishing and cylinder drying) to obtain the chemical adhesive modified polyester filament nonwoven fabric for the drainage board filter membrane.

[0016] Optionally, during the crystallization drying process in step 1, the drying temperature is 165℃~175℃ (e.g., 170℃).

[0017] In this invention, the polyester chips are crystallized and dried to remove moisture from the polyester chips.

[0018] Optionally, in step 1, the nonwoven fabric obtained by splitting and laying the filaments has a basis weight of 100-115 g / m². 2 .

[0019] Optionally, in step 1, the acupuncture reinforcement includes pre-acupuncture and main acupuncture; the acupuncture density of the pre-acupuncture is 18-25 needles / cm². 2 The needle insertion depth is 8–10 mm; the needle insertion density of the main needle is 25–32 needles / cm². 2 The needle insertion depth is 8-10 mm.

[0020] This invention ensures fiber entanglement by adjusting the needle punching density, while controlling the equivalent pore size and permeability coefficient of the product, thus guaranteeing that the filter membrane product meets the required standards.

[0021] Optionally, during the hot rolling process in step 1, the hot rolling temperature is 140–160°C (e.g., 145°C, 150°C, or 155°C).

[0022] In existing technologies, conventional drainage board filter membrane product manufacturing processes do not include a chemical adhesive application process; typically, fibers are thermally bonded using a high hot rolling temperature (200–210°C). This invention employs a lower hot rolling temperature combined with a chemical adhesive application process (i.e., impregnation finishing using acrylic adhesives) to enhance the fiber bonding strength in the filter membrane product, which helps reduce production energy consumption while ensuring fiber bonding strength.

[0023] Optionally, during the hot rolling process in step 1, the hot rolling pressure is 40 to 50 bar (e.g., 45 bar).

[0024] Optionally, in step 2, the solid content of the chemical adhesive aqueous solution is 9% to 11%.

[0025] Optionally, in step 2, the mass ratio of acrylate adhesive, water, and curing agent in the chemical adhesive aqueous solution is 100:300:4.

[0026] Optionally, in step 2, the amount of chemical adhesive applied to the chemically modified polyester filament nonwoven fabric for the drainage board filter membrane prepared by impregnation and drying is 20% to 25%.

[0027] In this invention, by controlling the amount of adhesive applied to the product for drainage plate filter membrane, it is beneficial to control the product's resistance to deformation, vertical permeability coefficient, equivalent pore size, as well as its strength and elongation after immersion in water, thereby obtaining a high-quality filter membrane product.

[0028] This invention modifies traditional drainage board filter membranes using acrylic chemical adhesives, resulting in a novel, highly stable drainage board filter membrane with deformation resistance, high permeability coefficient, small equivalent pore size, and stable performance under influent conditions. This significantly improves upon the poor deformation resistance and significant changes in strength and elongation after immersion in water that are produced by traditional hot-melt bonding processes.

[0029] In this invention, the above-mentioned technical features can be freely combined to form new technical solutions, provided they do not conflict with each other.

[0030] Compared with the prior art, the above-mentioned technical solution provided by the present invention has the following beneficial technical effects:

[0031] (1) The present invention uses acrylic adhesive to coat polyester filament nonwoven fabric (impregnation finishing), and enhances the bonding degree of polyester filament fibers in filter membrane products through the bonding effect of chemical adhesive. After drying by round screen, a dense hydrophobic layer is formed on the surface of polyester filament fibers, which is conducive to water flow and improves the stiffness and tensile strength of filter membrane products.

[0032] (2) This invention ensures the entanglement between fibers by controlling the needle density in the needle-punching reinforcement process, and at the same time ensures the equivalent pore size and permeability coefficient of the prepared product.

[0033] (3) The present invention uses a lower hot rolling temperature and combines a chemical adhesive coating process (i.e., using acrylic adhesives for impregnation and finishing) to strengthen the fiber bonding strength in the filter membrane product, which is beneficial to reduce production energy consumption while ensuring fiber bonding strength.

[0034] (4) The chemically modified polyester filament nonwoven fabric for drainage board filter membrane produced by the preparation method of the present invention has excellent functions such as deformation resistance, high permeability and strength attenuation resistance, and can adapt to a variety of use environments. Attached Figure Description

[0035] Figure 1 This is a process flow diagram for preparing chemically modified polyester filament nonwoven fabric for drainage board filter membrane in this invention. Detailed Implementation

[0036] To make the objectives, 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 with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, this specification shall prevail.

[0038] Example 1

[0039] A method for preparing chemically modified polyester filament nonwoven fabric for drainage board filter membranes, such as... Figure 1 As shown, the process includes raw material feeding, crystallization drying, melt spinning, cooling and stretching, filament splitting and web laying, needle punching reinforcement, cylinder web shaping, hot rolling treatment, impregnation and drying (i.e., impregnation finishing and cylinder web drying) and slitting and winding. The specific steps are as follows.

[0040] Step S1: Polyester chips are added to the main feed hopper (i.e., raw material feeding). After crystallization and drying to remove moisture from the chips, they are then fed into the screw extruder for melting. The drying temperature is 170℃. During the melting process, the polyester chips are mixed and then melt-extruded through the screw extruder. The temperatures of the screw extruder are 275℃ in zone 1, 280℃ in zone 2, 280℃ in zone 3, 285℃ in zone 4, 283℃ in zone 5, and 280℃ in zone 6. After being filtered and metered by a metering pump, the melt enters the spinning box for spinning. After being cooled by side blowing (air temperature 20℃), it is conveyed by the drawing tube to the splitting sheet. After splitting on the splitting sheet, the fibers are evenly spread onto the forming curtain to obtain a nonwoven fabric with a basis weight of 100-115 g / m². 2 Then, the nonwoven fabric web is reinforced by needle punching, including pre-needle punching and main needle punching, to give it a certain strength. In the pre-needle punching process, the needle density is 4385 needles / m and the needle punching density is approximately 21 needles / cm. 2 During the main acupuncture procedure, the needle placement density was 4385 needles / m, and the acupuncture density was 29 needles / cm. 2 The needle-punching depth is 8-10 mm; then, the needle-punched and reinforced product is shaped into a circular mesh, and then hot-rolled using an online thickness control device to obtain a polyester filament nonwoven fabric; wherein, the hot-rolling temperature is 140-160℃ and the hot-rolling pressure is 40-50 bar.

[0041] Step S2: Impregnate the polyester filament nonwoven fabric with a chemical adhesive, and then dry the impregnated fabric through an eight-circle wire to obtain the chemically modified polyester filament nonwoven fabric (i.e., Figure 1 (Immersion and drying in the process). The impregnation machine pressure is approximately 1 bar, and the chemical adhesive is made from a badifu acrylic adhesive aqueous solution. The chemical adhesive formula is: 3.0 ml of soft water... 31000 kg of badifu acrylic adhesive and 40 kg of badifu additives; the solid content of the chemical adhesive is 9% to 11%.

[0042] Finally, products of different widths are cut according to customer needs.

[0043] Examples 2-6

[0044] Examples 2-5 use the preparation method of Example 1 to prepare chemically modified polyester filament nonwoven fabrics for drainage board filter membranes. In step S2, chemically modified polyester filament nonwoven fabrics with adhesive amounts of 17%, 20%, 25%, and 30% are obtained by impregnation finishing as drainage board filter membrane products.

[0045] Example 6 prepared a chemically modified polyester filament nonwoven fabric for a drainage board filter membrane using the preparation method of Example 1. The difference from Example 1 is that the acrylate adhesive was changed from Badifu acrylate adhesive to Hongpu HP978 acrylate adhesive; that is, the chemical adhesive formulation was: 3.0 ml of soft water. 3 The following materials were used: 1000 kg of Hongpu HP978 acrylic adhesive and 40 kg of Baolijia additives. Compared with Badifu acrylic adhesive, Hongpu HP978 acrylic adhesive has a lower acrylic acid content. In this embodiment, the adhesive application rate of the chemically modified polyester filament nonwoven fabric for the drainage board filter membrane was controlled at 25%.

[0046] Performance testing

[0047] The dry properties and wet properties after immersion in water for 24 hours of the chemically modified polyester filament nonwoven fabrics for drainage board filter membranes obtained in Examples 2-6 were tested according to JTS / T245-2023. The equivalent pore size was tested according to GB / T 14799-2005, and the vertical permeability coefficient was tested according to GB / T 15789-2016. Table 2 shows the relevant properties of each chemically modified polyester filament nonwoven fabric for drainage board filter membranes.

[0048] Table 1. Relevant properties of chemically modified polyester filament nonwoven fabrics for drainage board filter membranes prepared in Examples 2-6.

[0049]

[0050] As shown in Table 1, the performance of polyester filament nonwoven fabrics modified with acrylate adhesives for use as drainage board filter membranes can all reach the dry and wet performance indicators of nonwoven filter membranes. The polyester filament nonwoven fabrics obtained with an acrylate adhesive content between 20% and 25% have the best performance and are more suitable for use as drainage board filter membranes.

[0051] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A chemically modified polyester filament nonwoven fabric for drainage board filter membranes, characterized in that, The product comprises, by weight percentage, 75-80% polyester filament fiber web and 20-25% chemical adhesive; the chemical adhesive is adhered to the surface of the polyester filament fibers, and the chemical adhesive includes acrylate adhesives and curing agents.

2. The chemically modified polyester filament nonwoven fabric for drainage board filter membrane according to claim 1, characterized in that, The mass ratio of the acrylate adhesive to the curing agent is 25:

1.

3. The chemically modified polyester filament nonwoven fabric for drainage board filter membrane according to claim 1 or 2, characterized in that, The chemically modified polyester filament nonwoven fabric has a basis weight of 100-120 g / m². 2 .

4. The chemically modified polyester filament nonwoven fabric for drainage board filter membrane according to claim 1 or 2, characterized in that, The equivalent pore size O of the chemically modified polyester filament nonwoven fabric used for the drainage board filter membrane is... 95 The thickness is 0.07–0.13 mm, and the permeability coefficient k ≥ 5 × 10⁻⁶. -2 cm / s, dry longitudinal strength ≥30N / cm, 24h wet transverse strength ≥25N / cm.

5. A method for preparing a chemically modified polyester filament nonwoven fabric for a drainage board filter membrane according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1: The polyester chips are subjected to crystallization drying, melt spinning, cooling stretching, filament separation and web laying, needle punching reinforcement, round web shaping and hot rolling to obtain polyester filament fiber nonwoven fabric. Step 2: Impregnate and dry the polyester filament nonwoven fabric with a chemical adhesive aqueous solution to obtain the chemical adhesive modified polyester filament nonwoven fabric for the drainage board filter membrane.

6. The method for preparing chemically modified polyester filament nonwoven fabric for drainage board filter membrane according to claim 5, characterized in that, During the crystallization drying process in step 1, the drying temperature is 165℃~175℃; In step 1, the acupuncture reinforcement includes pre-acupuncture and main acupuncture; the acupuncture density of the pre-acupuncture is 18-25 needles / cm. 2 The needle insertion depth is 8–10 mm; the needle insertion density of the main needle is 25–32 needles / cm². 2 The needle insertion depth is 8–10 mm; During the hot rolling process in step 1, the hot rolling temperature is 140–160°C and the hot rolling pressure is 40–50 bar.

7. The method for preparing chemically modified polyester filament nonwoven fabric for drainage board filter membrane according to claim 5 or 6, characterized in that, In step 1, the filament splitting and web laying process yields a nonwoven fabric with a basis weight of 100–115 g / m². 2 .

8. The method for preparing chemically modified polyester filament nonwoven fabric for drainage board filter membrane according to claim 5, characterized in that, In step 2, the solid content of the chemical adhesive aqueous solution is 9% to 11%.

9. The method for preparing chemically modified polyester filament nonwoven fabric for drainage board filter membrane according to claim 5, characterized in that, In the chemical adhesive aqueous solution, the mass ratio of acrylate adhesive, water and curing agent is 100:300:

4.

10. The method for preparing chemically modified polyester filament nonwoven fabric for drainage board filter membranes according to any one of claims 8-9, characterized in that, In step 2, the amount of chemical adhesive applied to the chemically modified polyester filament nonwoven fabric for the drainage plate filter membrane prepared by impregnation and drying is 20% to 25%.

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