Waterproof coating and application thereof, and preparation method of water-blocking yarn

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a waterproof coating, application thereof and a preparation method of water-blocking yarn. The invention provides a waterproof coating which is prepared from the following components in parts by mass: 100 parts of a monomer, 0.1 to 5 parts of a cross-linking agent, 30 to 65 parts of a pH value regulator, 5 to 100 parts of a toughening agent, 0.01 to 2 parts of an initiator and 100 to 200 parts of water, the monomer is carboxylic acid or anhydride containing double bonds; the toughening agent comprises a water-based emulsion. The water-blocking yarn prepared from the waterproof coating provided by the invention can effectively relieve the powder falling phenomenon in the use process.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a waterproof coating and application thereof, and a preparation method of a water-blocking yarn. Background Art

[0002] During the laying and operation of wires and cables, when mechanical stress causes damage to the wires and cables, moisture in the surrounding environment will penetrate into the wires and cables, causing interruption of communication cable signal transmission, and may cause water tree breakdown of the cable, leading to major power outages. In order to solve the above problems, water-blocking powder is now mostly used to coat polyester and other synthetic fibers to make water-blocking yarn. When water vapor invades, the water-blocking yarn can quickly absorb water, swell to form gel, and block all possible water seepage channels, thereby providing completely reliable sealing and waterproof performance.

[0003] At present, the production of water-blocking yarn generally adopts the method of coating polymerization of water-soluble precursors combined with roller pressing, which has the advantages of large amount of sizing and no use of organic solvents. However, the water-blocking yarn produced by this method generally has the undesirable phenomenon of serious powder loss during use. Summary of the invention

[0004] The purpose of the present invention is to provide a waterproof coating and its application, and a method for preparing a water-blocking yarn. The water-blocking yarn prepared by the waterproof coating provided by the present invention can effectively alleviate the occurrence of powder falling during use.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a waterproof coating, which comprises the following components by weight: 100 parts of a monomer, 0.1 to 5 parts of a cross-linking agent, 30 to 65 parts of a pH regulator, 5 to 100 parts of a toughening agent, 0.01 to 2 parts of an initiator, and 100 to 200 parts of water;

[0007] The monomer is a carboxylic acid or anhydride containing a double bond;

[0008] The toughening agent includes an aqueous emulsion.

[0009] Preferably, the monomer includes one or more of acrylic acid, methacrylic acid, maleic anhydride and itaconic acid.

[0010] Preferably, the crosslinking agent includes one or more of polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, methylenebisacrylamide, trihydroxyethylpropane tri(meth)acrylate and pentaerythritol tetra(meth)acrylate.

[0011] Preferably, the aqueous emulsion includes one or more of VAE emulsion, EVA emulsion, acrylic emulsion, PU emulsion, styrene-butadiene emulsion and chloroprene emulsion.

[0012] Preferably, the pH adjuster includes one or more of sodium hydroxide, potassium hydroxide, lithium hydroxide and ammonia water;

[0013] The initiator includes ammonium persulfate.

[0014] Preferably, the waterproof coating further comprises an auxiliary polymerization monomer, and the auxiliary polymerization monomer comprises one or more of acrylamide, 2-acrylamide-2-methylpropane sulfonic acid and p-styrene sulfonic acid;

[0015] The mass fraction of the auxiliary polymerization monomer is 1 to 30 parts based on the mass fraction of the monomer.

[0016] The present invention also provides application of the waterproof coating described in the above technical solution in water-blocking yarn.

[0017] The present invention also provides a method for preparing a water-blocking yarn, comprising the following steps:

[0018] After the fiber is immersed in the coating, it is polymerized to obtain the fiber to be treated; the coating is the waterproof coating described in the above technical solution;

[0019] The fiber to be treated is subjected to roller pressing treatment to obtain the water-blocking yarn.

[0020] Preferably, the polymerization temperature is 120-190° C. and the polymerization time is 60-90 seconds.

[0021] Preferably, the pressure of the roller pressing treatment is 0.1-0.4 MPa;

[0022] During the roller pressing treatment, the speed at which the fiber to be treated passes through the roller press is 30-45 m / min.

[0023] The present invention provides a waterproof coating, which comprises the following components by mass: 100 parts of monomer, 0.1-5 parts of cross-linking agent, 30-65 parts of pH value regulator, 5-100 parts of toughening agent, 0.01-2 parts of initiator and 100-200 parts of water; the monomer is a carboxylic acid or anhydride containing a double bond; the toughening agent comprises an aqueous emulsion. The present invention adds an aqueous emulsion as a toughening agent to the coating, utilizes the elasticity and elongation of the aqueous emulsion to improve the brittleness of polyacrylic acid sodium salt, reduces the damage of mechanical friction to the highly absorbent resin coating of the water-blocking yarn, plays a toughening role, and can effectively alleviate the occurrence of powdering of the water-blocking yarn during use. DETAILED DESCRIPTION

[0024] The present invention provides a waterproof coating, which comprises the following components by weight: 100 parts of a monomer, 0.1 to 5 parts of a cross-linking agent, 30 to 65 parts of a pH regulator, 5 to 100 parts of a toughening agent, 0.01 to 2 parts of an initiator, and 100 to 200 parts of water;

[0025] The monomer is a carboxylic acid or anhydride containing a double bond;

[0026] The toughening agent includes an aqueous emulsion.

[0027] The waterproof coating provided by the present invention comprises 100 parts of monomers by weight. In the present invention, the monomers preferably comprise one or more of acrylic acid, methacrylic acid, maleic anhydride and itaconic acid.

[0028] Based on the mass fraction of the monomer, the waterproof coating provided by the present invention includes 0.1 to 5 parts of a crosslinking agent, specifically 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, and 5 parts. In the present invention, the crosslinking agent preferably includes one or more of polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, methylenebisacrylamide, trihydroxyethylpropane tri(meth)acrylate, and pentaerythritol tetra(meth)acrylate.

[0029] Based on the mass fraction of the monomer, the waterproof coating provided by the present invention includes 30 to 65 parts of a pH adjuster, specifically 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, and 65 parts. In the present invention, the pH adjuster preferably includes one or more of sodium hydroxide, potassium hydroxide, lithium hydroxide, and ammonia water.

[0030] Based on the mass fraction of the monomer, the waterproof coating provided by the present invention includes 5 to 100 parts of a toughening agent, specifically 5 parts, 10 parts, 20 parts, 30 parts, 40 parts, 50 parts, 60 parts, 70 parts, 80 parts, 90 parts, and 100 parts. In the present invention, the toughening agent includes an aqueous emulsion, and the aqueous emulsion preferably includes one or more of a VAE emulsion, an EVA emulsion, an acrylic emulsion, a PU emulsion, a styrene-butadiene emulsion, and a chloroprene emulsion.

[0031] Based on the mass fraction of the monomer, the waterproof coating provided by the present invention includes 0.01 to 2 parts of initiator, specifically 0.01 parts, 0.1 parts, 0.5 parts, 1 parts, 1.5 parts, and 2 parts. In the present invention, the initiator preferably includes ammonium persulfate.

[0032] Based on the mass fraction of the monomer, the waterproof coating provided by the present invention includes 100 to 200 parts of water, specifically 100 parts, 150 parts, or 200 parts.

[0033] In the present invention, the waterproof coating preferably further includes auxiliary polymerization monomers, and the auxiliary polymerization monomers preferably include one or more of acrylamide, 2-acrylamide-2-methylpropane sulfonic acid and p-styrene sulfonic acid. Based on the mass fraction of the monomers, the mass fraction of the auxiliary polymerization monomers is 1 to 30 parts, specifically 1 part, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts.

[0034] The present invention also provides application of the waterproof coating described in the above technical solution in water-blocking yarn.

[0035] The present invention also provides a method for preparing a water-blocking yarn, comprising the following steps:

[0036] After the fiber is immersed in the coating, it is polymerized to obtain the fiber to be treated; the coating is the waterproof coating described in the above technical solution;

[0037] The fiber to be treated is subjected to roller pressing treatment to obtain the water-blocking yarn.

[0038] The present invention immerses the fiber in the coating and then polymerizes it to obtain the fiber to be treated.

[0039] In the present invention, the fiber includes polyester fiber or aramid fiber; the fineness of the fiber is preferably 50 to 10000D. In a specific embodiment of the present invention, the fineness of the polyester fiber is preferably 1260D; the fineness of the aramid fiber is preferably 1580D.

[0040] The present invention has no special limitation on the impregnation process, and the process known to those skilled in the art can be adopted. After the impregnation, the present invention also preferably removes excess coating from the impregnated fibers using double rollers. In the present invention, the polymerization temperature is preferably 120 to 190°C, specifically 120°C, 130°C, 140°C, 150°C, 155°C, 160°C, 170°C, 180°C, 190°C, and the time is preferably 60 to 90s, specifically 60s, 70s, 80s, 90s.

[0041] After obtaining the fiber to be treated, the present invention performs roller pressing on the fiber to be treated to obtain the water-blocking yarn.

[0042] In the present invention, the pressure of the roller pressing treatment is preferably 0.1-0.4 MPa, specifically 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa; during the roller pressing treatment, the speed at which the treated fiber passes through the roller press is preferably 30-45 m / min, specifically 30 m / min, 35 m / min, 40 m / min, 45 m / min. After the roller pressing treatment, the present invention also preferably rolls up the treated fiber.

[0043] In the present invention, the sizing amount of the water-blocking yarn is preferably 15-30%.

[0044] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0045] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Examples and Comparative Examples

[0047] The coating used, in parts by mass, includes 100 parts of acrylic acid, 10 parts of acrylamide, 0.6 parts of methylenebisacrylamide, 40 parts of sodium hydroxide, a toughening agent, 0.5 parts of ammonium persulfate and 100 parts of water;

[0048] The fiber is immersed in the coating, and the excess coating is removed by passing the immersed fiber through a double roller, and then the fiber is passed through a hot channel, the channel temperature is 155°C, the heat treatment time is 1.5 minutes, and a resin layer is formed on the fiber surface by in-situ polymerization to obtain the fiber to be treated;

[0049] The fiber to be treated is subjected to roller pressing treatment, wherein the pressure of the roller pressing treatment is 0.2 MPa. During the roller pressing treatment, the fiber to be treated passes through the roller press at a rate of 40 m / min. The treated fiber is rolled up to obtain a water-blocking yarn.

[0050] The yarns of different specifications and treatment methods of the embodiments and comparative examples are shown in Table 1;

[0051] The expansion ratio and powder loss of the water-blocking yarn obtained in the embodiment and the comparative example were tested;

[0052] Swelling ratio test method: The amount of water absorbed by the water-blocking yarn when immersed in water for 1 minute is expressed as the ratio of the water absorbed volume when immersed in water for 1 minute to the mass of the water-blocking yarn. The unit is milliliter per gram (mL / g), which is used to measure the volume expansion rate of the water-blocking yarn (test standard: YD / T1115.2-2003 Water-blocking materials for communication cables and optical cables Part 2: Water-blocking yarn).

[0053] Powder loss test method: pass the water-blocking yarn through a tension wire clamp with 5 wire guide ports, rewind the water-blocking yarn at a tension of 10N and a speed of 150m / min, rewind 1000m of water-blocking yarn, collect the powder, and weigh it.

[0054] The test results obtained are shown in Table 1;

[0055] Table 1 Processing conditions and test results of embodiments and comparative examples

[0056]

[0057] It can be seen from Table 1 that the powder loss of polyester yarn (1260D) is about 350 mg / km when no toughening agent is added, and the powder loss is reduced to about 40 mg / km when the toughening agent is used, and the powder loss is significantly reduced. Comparative Example 1 is a water-blocking yarn using polyethylene glycol 1000 reported in the literature, and its powder loss is about 150 mg / km, and the powder loss is in the form of flakes. At the same time, the waterproof coating provided by the present invention also shows the same characteristics on aramid yarn (1580D).

[0058] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A waterproof coating, characterized in that: The waterproof coating comprises the following components in parts by mass: 100 parts of monomer, 0.1 to 5 parts of cross-linking agent, 30 to 65 parts of pH value adjuster, 5 to 100 parts of toughening agent, 0.01 to 2 parts of initiator and 100 to 200 parts of water; The monomer is a carboxylic acid or anhydride containing a double bond; The toughening agent includes an aqueous emulsion.

2. The waterproof coating according to claim 1, characterized in that: The monomers include one or more of acrylic acid, methacrylic acid, maleic anhydride and itaconic acid.

3. The waterproof coating according to claim 1, characterized in that: The crosslinking agent includes one or more of polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, methylenebisacrylamide, trihydroxyethylpropane tri(meth)acrylate and pentaerythritol tetra(meth)acrylate.

4. The waterproof coating according to claim 1, characterized in that: The aqueous emulsion includes one or more of VAE emulsion, EVA emulsion, acrylic emulsion, PU emulsion, styrene-butadiene emulsion and chloroprene emulsion.

5. The waterproof coating according to claim 1, characterized in that: The pH value adjusting agent includes one or more of sodium hydroxide, potassium hydroxide, lithium hydroxide and ammonia; The initiator includes ammonium persulfate.

6. The waterproof coating according to any one of claims 1 to 5, characterized in that: The waterproof coating also includes auxiliary polymerization monomers, which include one or more of acrylamide, 2-acrylamide-2-methylpropane sulfonic acid and p-styrene sulfonic acid; The mass fraction of the auxiliary polymerization monomer is 1 to 30 parts based on the mass fraction of the monomer.

7. Use of the waterproof coating according to any one of claims 1 to 6 in water-blocking yarn.

8. A method for preparing a water-blocking yarn, characterized in that: The following steps are involved: After the fiber is immersed in the coating, polymerization is performed to obtain the fiber to be treated; the coating is the waterproof coating according to any one of claims 1 to 6; The fiber to be treated is subjected to roller pressing treatment to obtain the water-blocking yarn.

9. The preparation method according to claim 8, characterized in that: The polymerization temperature is 120-190° C. and the polymerization time is 60-90 seconds.

10. The preparation method according to claim 8, characterized in that: The pressure of the roller pressing treatment is 0.1-0.4 MPa; During the roller pressing treatment, the speed at which the fiber to be treated passes through the roller press is 30-45 m / min.

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