CN116043559A - Antistatic coating for drying net, drying net treatment process and application - Google Patents
Antistatic coating for drying net, drying net treatment process and application Download PDFInfo
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/224—Esters of carboxylic acids; Esters of carbonic acid
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/224—Esters of carboxylic acids; Esters of carbonic acid
- D06M13/2243—Mono-, di-, or triglycerides
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/244—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus
- D06M13/282—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing phosphorus
- D06M13/292—Mono-, di- or triesters of phosphoric or phosphorous acids; Salts thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/53—Polyethers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/10—Wire-cloths
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
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Abstract
The application discloses an antistatic drying net coating, which relates to the technical field of antistatic coatings and comprises an impregnating modification solution and a coating solution; the dipping modification liquid comprises the following components in parts by weight: 40-50 parts of polyurethane acrylic ester; 0.5-1.2 parts of initiator; 8-10 parts of polyethylene glycol; 0.8-1.5 parts of glyceryl monostearate; 1-2 parts of an antioxidant; the coating liquid comprises the following components in parts by weight: 100 parts of polymerized emulsion, 0.5 to 1.5 parts of antistatic agent TF-4816 and 2 to 5 parts of antioxidant. The application comprises impregnating modifying liquid and coating liquid, wherein an impregnating layer and a coating layer are respectively formed on the surface of a drying net, and after the coating layer is worn locally, the unworn coating layer can still form an antistatic layer with the impregnating layer, so that the wear resistance of the antistatic layer of the drying net is maintained.
Description
Technical Field
The application relates to the technical field of antistatic coatings, in particular to an antistatic drying net coating, a drying net treatment process for papermaking and application of the antistatic drying net coating in the papermaking field.
Background
In the paper-making production process, the paper is required to be laid flat and dried, and generally polyester monofilament (polyester) is woven into a drying net, and the paper is laid flat on the drying net for drying.
In the process of drying paper on the drying net, because the air humidity is low, after the paper is dried to a certain degree, the moisture on the surface of the drying net is low, static electricity is easy to generate, and fire is caused seriously.
Drying webs therefore typically use adjuvants to enhance antistatic properties; however, most of the existing auxiliary agents are attached to the surface of the drying net to form an antistatic layer, so that the antistatic effect is achieved;
in the continuous use process of the drying net, friction can occur, the antistatic layer can be abraded, the antistatic performance is reduced, and particularly after partial breakage, the antistatic layer can not be connected into a piece, and the antistatic performance is greatly reduced; it is therefore necessary to carry out the auxiliary attachment after a certain period of use.
However, if the local antistatic performance is lost, static risks may occur, so that the auxiliary agent is attached before the antistatic layer is worn out to expose the bottom layer; under the condition that judgment is difficult, the adhesion frequency of the auxiliary agent is too high, which causes labor and time consumption, and the local antistatic layer is possibly worn out due to the too low frequency.
Disclosure of Invention
In order to solve at least one of the above technical problems, a method has been developed for forming an abrasion-resistant antistatic layer on the surface of a drying wire, which does not significantly reduce the overall antistatic performance after partial abrasion; the application provides an antistatic drying net coating, a drying net treatment process for papermaking and application of the antistatic drying net coating in the papermaking field.
In a first aspect, the application provides an antistatic dry web coating, comprising an impregnating modifying solution and a coating solution; the dipping modification liquid comprises the following components in parts by weight: 40-50 parts of polyurethane acrylic ester; 0.5-1.2 parts of initiator; 8-10 parts of polyethylene glycol; 0.8-1.5 parts of glyceryl monostearate; 1-2 parts of an antioxidant; the coating liquid comprises the following components in parts by weight: 100 parts of polymerized emulsion, 0.5 to 1.5 parts of antistatic agent TF-4816 and 2 to 5 parts of antioxidant.
Optionally, the impregnation modifying liquid comprises the following components in parts by weight: 40-50 parts of polyurethane acrylic ester, 0.5-1.2 parts of initiator, 8-10 parts of polyethylene glycol, 1.1-1.2 parts of glyceryl monostearate and 1-1.5 parts of antioxidant.
Optionally, the coating liquid comprises the following components in parts by weight: 100 parts of polymeric emulsion, 1-1.2 parts of antistatic agent TF-4816 and 4-4.5 parts of antioxidant.
Optionally, the antioxidant in the impregnation modifying solution is selected from the group consisting of one or more of antioxidant 168, antioxidant 1010, and antioxidant 1076; the antioxidant in the coating liquid is selected from a combination of phosphorus antioxidant and hindered phenol antioxidant.
Optionally, the initiator adopts one or two of sodium persulfate and potassium persulfate.
Optionally, the coating liquid comprises the following components in parts by weight: 2-3 parts of hydrophobizing agent.
Optionally, the hydrophobizing agent is an organosilicon hydrophobizing agent.
In a second aspect, the present application provides a process for treating a drying wire for papermaking, comprising the steps of:
s1 preparation of an impregnating layer
S1.1, adding polyethylene glycol into polyurethane acrylic ester, and stirring and mixing to obtain a mixed solution;
s1.2, immersing a drying net into the mixed solution, adding an initiator, heating and carrying out ultrasonic homogenization for 15-25min;
s1.3, adding glyceryl monostearate and an antioxidant, homogenizing for 15-25min by ultrasound, keeping constant temperature, standing for 24h to form an impregnated layer, and taking out a drying net;
s2, preparing a coating layer
Uniformly mixing the polymerization emulsion, the electrostatic agent TF-4816 and the antioxidant to form a coating liquid, and spraying the coating liquid onto the surface of the dried net treated in the step S1.
By adopting the technical scheme, the impregnating layer and the coating layer are sequentially formed on the surface of the drying net, and the drying net, the impregnating layer and the coating layer are two-phase permeable, so that the bonding strength is improved, and the wear resistance is improved; and the coating layer can enhance antistatic properties in cooperation with the dipping layer while the degree of abrasion of the coating layer can be detected by seeing the dipping layer. Under the condition that the coating layer is worn locally to expose the impregnating layer, the coating layer which is not detached still can play a role in improving the antistatic property of the impregnating layer; the coating layer can also extend the antistatic aging of the antistatic agent in the impregnation layer by covering the impregnation layer.
Optionally, in S1, immersing the dry mesh in the impregnation modifying solution, and heating to 75-85 ℃.
By adopting the technical scheme, the degree of penetration of the impregnation layer into the drying net is improved, and the wear resistance is improved.
In a third aspect, the present application provides an antistatic dry web coating for use in papermaking.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. the antistatic coating is set as impregnating modifying liquid and coating liquid, an impregnating layer and a coating layer are respectively formed on the surface of the drying net, and after the coating layer is partially worn, the unworn coating layer can still form an antistatic layer with the impregnating layer, so that the antistatic performance of the drying net is maintained;
2. the polyurethane acrylic ester in the dipping modification liquid is crosslinked with polyester through an initiator and polyethylene glycol to form a dipping layer which is not easy to fall off, the antistatic agent glyceryl monostearate in the dipping layer and the polyurethane acrylic ester have good compatibility and are stably distributed in the dipping layer, the antistatic aging of the glyceryl monostearate is prolonged, and meanwhile the abrasion resistance of the antistatic agent in dry network friction is improved.
Detailed Description
The present application is described in further detail below with reference to examples.
The application designs an antistatic coating for a drying net, which comprises an impregnating modifying liquid and a coating liquid; the dipping modification liquid comprises the following components in parts by weight: 40-50 parts of polyurethane acrylic ester; 0.5-1.2 parts of initiator; 8-10 parts of polyethylene glycol; 0.8-1.5 parts of glyceryl monostearate; 1-2 parts of an antioxidant; the coating liquid comprises the following components in parts by weight: 100 parts of polymerized emulsion, 0.5 to 1.5 parts of antistatic agent TF-4816 and 2 to 5 parts of antioxidant.
The process for treating the drying net for papermaking comprises the following steps of:
s1 preparation of an impregnating layer
1.1 Adding polyethylene glycol into polyurethane acrylic ester, and stirring and mixing to obtain a mixed solution;
1.2 Immersing the drying net into the mixed solution, adding an initiator, heating and carrying out ultrasonic homogenization for 15-25min;
1.3 Adding glyceryl monostearate and antioxidant, homogenizing under ultrasound for 15-25min, standing at constant temperature for 24 hr to form an impregnated layer, and taking out;
s2, preparing a coating layer
Uniformly mixing the polymerization emulsion, the electrostatic agent TF-4816 and the antioxidant to form a coating liquid, and spraying the coating liquid onto the surface of the dried net treated in the step S1.
The application provides an application of antistatic drying net coating in the field of papermaking.
The application is to make the drying net possess antistatic ability, reduce the static phenomenon in the course of drying, develop a kind of coating that drying net antistatic use, in the course of developing, find that antistatic agent add too much while can improve antistatic performance, but have influence on mechanical properties of the drying net itself, cause the service life to drop, reduce the antistatic performance can reduce more if the additive amount, if make into the coating, although the mechanical properties influence on the drying net is smaller, in the course of use of the drying net, the continuous friction can cause the coating to abrade, further make antistatic performance reduce, after the local abrasion is unable to form the continuous antistatic layer, the antistatic performance is seriously reduced; if the antistatic performance is reduced to be very low and can not be replaced in time, the static risk is easy to occur; therefore, the coating needs to be replaced and re-sprayed after a large area of damage occurs.
In view of the above, the applicant has developed an antistatic coating for a dry web, comprising an impregnating modifying solution and a coating solution, forming an impregnating layer and a coating layer on the surface of the dry web, respectively, wherein urethane acrylate in the impregnating modifying solution is crosslinked with a polyester material of the dry web under the action of polyethylene glycol and an initiator, and glyceryl monostearate and urethane acrylate have certain compatibility and are tightly bound in the impregnating layer, but the antistatic performance of the glyceryl monostearate is remarkably reduced with the prolongation of time, so that after forming the impregnating layer on the surface of the dry web, a layer of coating solution is coated, using the following publication no: CN 115058894A, the name of which is: the polymerization emulsion disclosed in the coating for the hydrolysis-resistant drying net is added with a commercially available antistatic agent TF-4816 to form a long-acting antistatic coating layer with certain water-repellent capacity outside the dipping layer; forming a double-layer antistatic system of the impregnating layer and the coating layer.
In the use process of the drying net, the coating layer gradually wears along with the extension of time and the friction with paper, the antistatic performance and the hydrophobic performance are reduced, when the coating layer wears seriously, the impregnation layer is exposed, at this time, the drying net can be obviously observed to be replaced, the replaced drying net is immersed in the coating liquid again, the coating layer is formed on the surface again, and the drying net is reused. The continuous utilization of the drying net is realized, and the abrasion condition of the coating layer of the drying net is easily monitored in the period of time before replacement, so that the abrasion condition of the antistatic layer on the surface of the drying net is prevented from generating an antistatic blank area. Thereby ensuring the antistatic performance of the drying net in the use process.
In the examples herein below, the compounds referred to are commercial products, specifically purchased from the national drug group, unless otherwise specified.
And (3) an initiator: one or two of sodium persulfate and potassium persulfate.
Polymerization emulsion: selected from the publication nos.: CN 115058894A, the name of which is: in the patent of textile auxiliary for hydrolysis resistant drying webs, example 1 discloses a polymeric emulsion.
Antistatic agent TF-4816: purchased from the company zhihuang-zhihuang company, inc.
Hindered phenolic antioxidants: antioxidant 168, antioxidant 1010, and antioxidant 1076 are exemplified.
Phosphorus antioxidant TNP (CAS number: 3050-88-2): tris (nonylphenyl) phosphite.
Phosphorus antioxidant TBP (CAS number 31570-04-4): tris (2, 4-di-t-butylphenyl) phosphite.
Hydrophobing agent: is an organosilicon hydrophobing agent, and has high self-produced density; model Phobe 1401.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
In this embodiment, an antistatic dry web coating includes an impregnating modifying liquid and a coating liquid; the dipping modification liquid comprises the following components in parts by weight: 40 parts of polyurethane acrylate; 0.5 parts of an initiator; 10 parts of polyethylene glycol; 0.8 parts of glyceryl monostearate; 1 part of antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 0.8 part of an antistatic agent TF-4816 and 3 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 40kg of polyurethane acrylic ester and 10kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.5kg of sodium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 15min, adding 0.8kg of glyceryl monostearate and 1kg of antioxidant 168, carrying out ultrasonic homogenization for 15min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
100kg of the polymerization emulsion, 0.8kg of antistatic agent TF-4816, 1.5kg of TNP and 1.5kg of antioxidant 168 were uniformly mixed at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 2
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 45 parts of polyurethane acrylate; 1 part of an initiator; 9 parts of polyethylene glycol; 0.9 parts of glyceryl monostearate; 1.2 parts of an antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 0.6 part of an antistatic agent TF-4816 and 2 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 45kg of polyurethane acrylic ester and 9kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 1kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 20min, adding 0.9kg of glyceryl monostearate and 1.2kg of antioxidant 1010, carrying out ultrasonic homogenization for 20min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
Uniformly mixing 100kg of the polymerization emulsion, 0.6kg of antistatic agent TF-4816, 1kg of TBP and 1kg of antioxidant 1010 at room temperature to form a coating solution; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 3
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 50 parts of polyurethane acrylate; 0.6 parts of an initiator; 8 parts of polyethylene glycol; 1 part of glyceryl monostearate; 1.5 parts of an antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 0.5 part of an antistatic agent TF-4816 and 3.5 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 50kg of polyurethane acrylic ester and 8kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.3kg of sodium persulfate and 0.3kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 25min, adding 1kg of glyceryl monostearate and 1.5kg of antioxidant 1076, carrying out ultrasonic homogenization for 25min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
Uniformly mixing 100kg of the polymerization emulsion, 0.5kg of antistatic agent TF-4816, 1.5kg of TNP and 2kg of antioxidant 1076 at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 4
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 45 parts of polyurethane acrylate; 1.1 parts of an initiator; 10 parts of polyethylene glycol; 1.1 parts of glycerol monostearate; 1 part of antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 1 part of an antistatic agent TF-4816 and 4 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 45kg of polyurethane acrylic ester and 10kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.3kg of sodium persulfate and 0.8kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 20min, adding 1.1kg of glyceryl monostearate, 0.5kg of antioxidant 168 and 0.5kg of antioxidant 1010, carrying out ultrasonic homogenization for 20min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
100kg of the polymerization emulsion, 1kg of antistatic agent TF-4816, 2kg of TBP, 1kg of antioxidant 168 and 1kg of antioxidant 1010 were uniformly mixed at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 5
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 50 parts of polyurethane acrylate; 0.7 parts of an initiator; 9 parts of polyethylene glycol; 1.2 parts of glyceryl monostearate; 1.5 parts of an antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 1.2 parts of an antistatic agent TF-4816 and 4.5 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 50kg of polyurethane acrylic ester and 9kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.7kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 25min, adding 1.2kg of glyceryl monostearate, 0.5kg of antioxidant 168 and 0.5. 0.5kg of antioxidant 1076, carrying out ultrasonic homogenization for 25min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
100kg of the polymerization emulsion, 1.2kg of antistatic agent TF-4816, 2.5kg of TBP, 1kg of antioxidant 168 and 1kg of antioxidant 1076 were uniformly mixed at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 6
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 40 parts of polyurethane acrylate; 1.2 parts of an initiator; 9 parts of polyethylene glycol; 1.3 parts of glyceryl monostearate; 1.2 parts of an antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 0.9 part of an antistatic agent TF-4816 and 5 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 40kg of polyurethane acrylic ester and 9kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.4kg of sodium persulfate and 0.8kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 25min, adding 1.3kg of glyceryl monostearate, 0.6kg of antioxidant 168, 0.3kg of antioxidant 1010 and 0.3kg of antioxidant 1076, carrying out ultrasonic homogenization for 25min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
Uniformly mixing 100kg of the polymerization emulsion, 0.9kg of antistatic agent TF-4816, 1kg of TNP, 2kg of antioxidant 168, 1kg of antioxidant 1010 and 1kg of antioxidant 1076 at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 7
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 45 parts of polyurethane acrylate; 0.8 parts of an initiator; 8 parts of polyethylene glycol; 1.4 parts of glyceryl monostearate; 2 parts of an antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 0.7 part of an antistatic agent TF-4816 and 4.5 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 45kg of polyurethane acrylic ester and 8kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.8kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 25min, adding 1.4kg of glyceryl monostearate and 2kg of antioxidant 168, carrying out ultrasonic homogenization for 25min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
100kg of the polymerization emulsion, 0.7kg of antistatic agent TF-4816, 2.5kg of TBP and 2kg of antioxidant 168 were uniformly mixed at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 8
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 40 parts of polyurethane acrylate; 0.9 parts of an initiator; 8 parts of polyethylene glycol; 1.5 parts of glyceryl monostearate; 1.8 parts of an antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymeric emulsion, 0.8 part of an antistatic agent TF-4816 and 4 parts of an antioxidant.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 40kg of polyurethane acrylic ester and 8kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.4kg of sodium persulfate and 0.5kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 20min, adding 1.5kg of glyceryl monostearate and 1.8kg of antioxidant 1010, carrying out ultrasonic homogenization for 20min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
Uniformly mixing 100kg of the polymerization emulsion, 0.8kg of antistatic agent TF-4816, 2kg of TNP and 2kg of antioxidant 1010 at room temperature to form a coating solution; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 9
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 45 parts of polyurethane acrylate; 1.1 parts of an initiator; 10 parts of polyethylene glycol; 1.1 parts of glycerol monostearate; 1 part of antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymerization emulsion, 1 part of an antistatic agent TF-4816, 4 parts of an antioxidant and 2 parts of a hydrophobizing agent.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 45kg of polyurethane acrylic ester and 10kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.3kg of sodium persulfate and 0.8kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 20min, adding 1.1kg of glyceryl monostearate, 0.5kg of antioxidant 168 and 0.5kg of antioxidant 1010, carrying out ultrasonic homogenization for 20min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
Uniformly mixing 100kg of the polymerization emulsion, 1kg of antistatic agent TF-4816, 2kg of TBP, 1kg of antioxidant 168, 1kg of antioxidant 1010 and 2kg of hydrophobic agent at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Example 10
In this embodiment, the impregnation modifying liquid includes the following components in parts by weight: 50 parts of polyurethane acrylate; 0.7 parts of an initiator; 9 parts of polyethylene glycol; 1.2 parts of glyceryl monostearate; 1.5 parts of an antioxidant. The coating liquid comprises the following components in parts by weight: 100 parts of a polymerization emulsion, 1.2 parts of an antistatic agent TF-4816, 4.5 parts of an antioxidant and 3 parts of a hydrophobizing agent.
In this example, the drying net was treated with the antistatic coating material for drying net.
Adding 50kg of polyurethane acrylic ester and 9kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.7kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 25min, adding 1.2kg of glyceryl monostearate, 0.5kg of antioxidant 168 and 0.5. 0.5kg of antioxidant 1076, carrying out ultrasonic homogenization for 25min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
100kg of the polymerization emulsion, 1.2kg of antistatic agent TF-4816, 2.5kg of TBP, 1kg of antioxidant 168, 1kg of antioxidant 1076 and 3kg of hydrophobic agent are uniformly mixed at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A drying net with a composite antistatic layer on the surface is obtained.
Comparative example 1
The difference from example 4 is that this comparative example uses an existing antistatic finish to treat the dry web.
Immersing the drying net in the antistatic finishing agent, heating to 75-85 ℃, carrying out ultrasonic homogenization for 25min, standing for 24h, taking out, and drying to obtain the treated drying net.
The antistatic finish of this comparative example was purchased from ZJ-NW16 antistatic agent of Zhuang Jie chemical industry.
Comparative example 2
The difference from example 4 is that this comparative example forms an impregnated layer only on the surface of the dried web.
Adding 45kg of polyurethane acrylic ester and 10kg of polyethylene glycol into a reaction kettle, and stirring while adding to obtain a mixed solution; immersing the dry net in the mixed solution, adding 0.3kg of sodium persulfate and 0.8kg of potassium persulfate, raising the temperature to 75-85 ℃, carrying out ultrasonic homogenization for 20min, adding 1.1kg of glyceryl monostearate, 0.5kg of antioxidant 168 and 0.5kg of antioxidant 1010, carrying out ultrasonic homogenization for 20min, keeping the constant temperature and standing for 24h to form an impregnated layer, and taking out the dry net.
A dry web with only an impregnated layer on the surface was obtained.
Comparative example 3
Immersing the drying net into the coating liquid prepared in the example 4, standing at room temperature for 2 hours, taking out, and drying to obtain the treated drying net.
The difference from example 4 is that this comparative example forms a coating layer only on the dried web surface.
100kg of the polymerization emulsion, 1kg of antistatic agent TF-4816, 2kg of TBP, 1kg of antioxidant 168 and 1kg of antioxidant 1010 were uniformly mixed at room temperature to form a coating liquid; and spraying the prepared coating liquid on the surface of the taken-out drying net, and forming a coating layer on the surface of the drying net.
A dry web with a coating layer on the surface is obtained.
Three drying wires were used in each of examples 1 to 10 and comparative examples 1 to 3, according to part 1 of the GB/T12703.1-2021 textile static Performance test method: the corona charging method requires that half-life detection is carried out on a drying net, and an average value is calculated; horizontally placing a drying net on paper at a constant temperature of 85 ℃ and 90RH, applying 2N acting force, rubbing the drying net back and forth at a moving speed of 1m/min, and detecting half-life of the drying net after rubbing for 2h, 5h and 10 h; the results obtained in the drying wire are shown in Table 1:
table 1 half life test results of drying nets before and after friction test
As is clear from the preparation examples 1 to 10, the comparative examples 1 to 3 and Table 1, the comparative example 1 has a low half life initially and good antistatic property, and the antistatic property after 2 hours of rubbing is not excellent, but the half life is 12, and the antistatic property can be better, but after more than 5 hours of rubbing, the half life is suddenly increased, the antistatic property is poor, which means that the abrasion of the drying net increases with the use process and the glyceryl monostearate is lost with time, and the antistatic property is more reduced.
Comparative example 2 under the action of urethane acrylate, polyethylene glycol and an initiator, the urethane acrylate part is compatible with polyester, and the part is crosslinked with glyceryl monostearate to form an impregnating layer with antistatic function, and the abrasion speed is reduced and the antistatic performance is reduced in the use process; however, the effect of the glyceryl monostearate is obviously reduced along with the extension of the storage time, so that the antistatic performance of the impregnation layer is obviously reduced after 5 hours.
Comparative example 3 a coating layer was formed on the surface of the dry web, and initially the antistatic property was excellent, but the abrasion resistance was poor, and after friction, the half life was increased and the antistatic property was drastically reduced.
Preparation examples 1-8 an impregnating layer is formed on the surface of a drying net so that an antistatic layer can resist abrasion, and a coating layer is formed on the outer surface of the impregnating layer so that the antistatic performance of the drying net is further improved; the antistatic property is given to the coating layer by the commonly used antistatic agent, but after the impregnating layer is combined with the coating layer, the antistatic property is enhanced by a larger extent compared with the impregnating layer only in comparative example 2 and the coating layer only in comparative example 3, which means that the impregnating layer has the effect of adding one to be more than two after the coating layer is combined; the antistatic performance is reduced more after the friction for 2 hours when only the coating layer is arranged, but after the coating layer is combined with the impregnating layer, the coating layer can still cooperate with the impregnating layer after the friction for 10 hours, so that the antistatic performance of the drying net is improved; the antistatic agent TF-4816 in the coating layer is compatible and combined with the impregnating layer through the polymerization emulsion, so that the abrasion resistance of the coating layer is enhanced, and meanwhile, the methyl methacrylate and the butyl acrylate in the polymerization emulsion have certain hydrophobicity, so that the hydrophobicity of the dry net is improved.
Preparation examples 9 to 10 are prepared by adding a hydrophobizing agent into a coating layer to improve the hydrophobic property of the surface of a drying net, although the half life is increased and the antistatic property is reduced to some extent, the reduction is small, the antistatic property is still in an excellent grade at 10h of friction, but a proper amount of hydrophobizing agent is added, so that the hydrophobic property of the drying net can be improved, the mechanical property of the drying net is ensured, and the service life of the drying net is prolonged.
Three dry webs of preparation examples 1-10 and comparative examples 1-3 were each subjected to an aging resistance test. Maintaining at constant temperature of 85deg.C and 90RH for 7 days, 14 days, and 28 days, taking out, performing half-life detection, and calculating average value to obtain the results shown in Table 2:
TABLE 2 half-life test results table for aging test of drying net
From examples 1 to 10, comparative examples 1 to 3 and Table 2, it is understood that:
comparative example 1 was initially lower in half life and similar to the antistatic property of the present application, but after 7 days of aging test treatment, the half life was significantly increased and the antistatic property was lowered, whereas after 14 days and 28 days of aging test treatment, the half life was gradually 12.3, exceeded the excellent standard, and the antistatic property was lowered by one grade. However, examples 1 to 10 had slightly different half lives from comparative example 1 according to the formulation ratios before the aging test treatment, but the antistatic properties were at a level; after the aging test treatment, the half-life of examples 1 to 10 is very small, and the antistatic performance is always at an excellent level; therefore, after the paint is adopted to treat the drying, the antistatic performance of the drying net reaches an excellent level, and the aging speed is slower than that of the prior art under the high-temperature and high-humidity environment, so that the service life is obviously prolonged.
The comparative example 2 and the comparative example 3, after being subjected to the aging test treatment, have larger half-life change and increase, and particularly the comparative example 3, shows that the antistatic performance of the drying net can not be kept at an excellent level all the time by the single impregnation layer or coating layer formed on the surface of the drying net through the impregnation liquid treatment of the present application; the initial antistatic performance of a single impregnation layer is poor, but in an aging test, the aging resistance is strong, and the antistatic performance is reduced by a small margin along with the increase of the aging time; the aging resistance is better than that of the prior art; however, a single coating layer has a low adhesion to a dry web, forms a void with the dry web as the aging time increases, and has a phenomenon of partial falling off, and its half life increases sharply, and the antistatic property decreases seriously.
Examples 9 to 10 have smaller half-life increase than examples 1 to 8, and hardly have a decrease in antistatic property; the antistatic performance of the anti-aging agent is slightly lower than that of examples 4-5 without the hydrophobic agent in the initial stage due to the addition of the hydrophobic agent, but the anti-aging capability of the anti-aging agent is obviously higher than that of examples 1-8 in an anti-aging test; in examples 9 to 10, the proportion of the added hydrophobing agent is different, but the antistatic performance of example 10 with more addition is slightly lower than that of example 9 in the initial stage, and the antistatic performance of example 10 with more addition of the hydrophobing agent is gradually the same as that of example 9 along with the aging test, so that in practical application, the cost of the hydrophobing agent is saved and the aging speed of the drying net in a high-humidity environment is ensured not to be greatly changed according to the proportion of example 9 with lower addition of the hydrophobing agent.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. An antistatic coating for a dry net is characterized by comprising an impregnating modifying liquid and a coating liquid; the dipping modification liquid comprises the following components in parts by weight: 40-50 parts of polyurethane acrylic ester; 0.5-1.2 parts of initiator; 8-10 parts of polyethylene glycol; 0.8-1.5 parts of glyceryl monostearate; 1-2 parts of an antioxidant; the coating liquid comprises the following components in parts by weight: 100 parts of polymerized emulsion, 0.5 to 1.5 parts of antistatic agent TF-4816 and 2 to 5 parts of antioxidant.
2. The antistatic dry web coating according to claim 1, wherein the impregnating modifying liquid comprises the following components in parts by weight: 40-50 parts of polyurethane acrylic ester, 0.5-1.2 parts of initiator, 8-10 parts of polyethylene glycol, 1.1-1.2 parts of glyceryl monostearate and 1-1.5 parts of antioxidant.
3. An antistatic dry web coating according to claim 1, wherein the coating liquid comprises the following components in parts by weight: 100 parts of polymeric emulsion, 1-1.2 parts of antistatic agent TF-4816 and 4-4.5 parts of antioxidant.
4. An antistatic dry web coating according to claim 1, wherein the antioxidant in the impregnation modifying liquid is selected from the group consisting of one or more of antioxidants 168, 1010 and 1076; the antioxidant in the coating liquid is selected from a combination of phosphorus antioxidant and hindered phenol antioxidant.
5. An antistatic dry web coating according to claim 1, wherein the initiator is one or a combination of two of sodium persulfate and potassium persulfate.
6. An antistatic dry web coating according to claim 1, wherein the coating solution further comprises 2-3 parts by weight of a hydrophobizing agent.
7. An antistatic dry web coating according to claim 6, wherein the hydrophobe is a silicone hydrophobe.
8. A process for treating a drying wire for papermaking, characterized in that the drying wire is treated with an antistatic coating for a drying wire according to claim 1, comprising the steps of:
s1 preparation of an impregnating layer
S1.1, adding polyethylene glycol into polyurethane acrylic ester, and stirring and mixing to obtain a mixed solution;
s1.2, immersing a drying net into the mixed solution, adding an initiator, heating and carrying out ultrasonic homogenization for 15-25min;
s1.3, adding glyceryl monostearate and an antioxidant, homogenizing for 15-25min by ultrasound, keeping constant temperature, standing for 24h to form an impregnated layer, and taking out a drying net;
s2, preparing a coating layer
Uniformly mixing the polymerization emulsion, the electrostatic agent TF-4816 and the antioxidant to form a coating liquid, and spraying the coating liquid onto the surface of the dried net treated in the step S1.
9. The process according to claim 8, wherein the step of adding an initiator to the impregnated layer prepared in step S1 is followed by heating to 75-85 ℃.
10. Use of an antistatic dry wire coating according to claim 1 in the field of paper manufacture.
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