CN114775325A - Dispersing agent for aramid fiber paper and preparation method and application thereof - Google Patents

Dispersing agent for aramid fiber paper and preparation method and application thereof Download PDF

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Publication number
CN114775325A
CN114775325A CN202210348474.XA CN202210348474A CN114775325A CN 114775325 A CN114775325 A CN 114775325A CN 202210348474 A CN202210348474 A CN 202210348474A CN 114775325 A CN114775325 A CN 114775325A
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China
Prior art keywords
aramid fiber
fatty alcohol
dispersing agent
polymer
solvent
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CN202210348474.XA
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Chinese (zh)
Inventor
杨玉敏
张瑞波
李克文
时东兴
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China Petroleum and Chemical Corp
Sinopec Engineering Group Co Ltd
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China Petroleum and Chemical Corp
Sinopec Engineering Group Co Ltd
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Priority to CN202210348474.XA priority Critical patent/CN114775325A/en
Publication of CN114775325A publication Critical patent/CN114775325A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/52—Epoxy resins
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

The invention discloses a dispersing agent for aramid fiber paper and a preparation method and application thereof, and relates to the technical field of chemical fiber paper manufacturing. The dispersing agent for the aramid fiber paper comprises polyol fatty acid ester, fatty alcohol-polyoxyethylene ether, a high-molecular epoxide polymer and a solvent. By adding the high molecular weight polymer as one of the main components of the dispersing agent, long molecular chains of the polymer are stretched in the slurry suspension, so that the surfaces of the fibers can be prevented from approaching each other, a layer of smooth and non-sticky hydrated film is formed on the surfaces of the fibers, the fiber pulp slurry keeps good suspension, an excellent dispersing effect is achieved, the dispersion of the aramid chopped fibers in water is effectively promoted, the uniformly dispersed fiber pulp suspension is obtained, the retention of the fibers on a forming net is reduced, and the uniformity, the tensile strength and the tearing strength of the material are improved.

Description

Dispersing agent for aramid fiber paper and preparation method and application thereof
Technical Field
The invention relates to the technical field of chemical fiber paper manufacturing, and particularly relates to a dispersing agent for aramid fiber paper, and a preparation method and application thereof.
Background
In the paper production process, fibers in the pulp suspension liquid have the tendency of flocculation and agglomeration, so that the fibers cannot be uniformly dispersed in water, a dispersing agent is required to be added to uniformly disperse the fibers, and excessive flocculation cannot occur, so that the uniformity and the strength of the paper are ensured.
Aramid fiber paper has excellent performances such as high temperature resistance, radiation resistance, flame retardance, electrical insulation and chemical stability, is applied more and more in the fields of safety protection, high-temperature filtration, electrical insulation, structural materials and the like, and becomes an important basic material in the fields of military, industry, science and technology and the like. Compared with other chemical fibers, the aramid fiber has stronger hydrophobicity, and particularly short fiber is easy to generate serious flocculation agglomeration. The dispersing effect of mechanical stirring is limited in the papermaking process, and new flocculation is generated in the dispersed fiber in the water filtration forming process, so that the evenness and the physical property of paper sheets are influenced, and a special dispersing agent is required to be added to stabilize a pulp water dispersing system.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a dispersing agent for aramid fiber paper and a preparation method and application thereof.
The invention is realized by the following steps:
in a first aspect, the invention provides a dispersing agent for aramid fiber paper, which comprises 1-20 wt% of polyol fatty acid ester, 1-20 wt% of fatty alcohol-polyoxyethylene ether, 0.5-5 wt% of high-molecular epoxide polymer and 50-97 wt% of a solvent.
In alternative embodiments, the high molecular epoxide polymer comprises any of a high molecular polymer of ethylene oxide or a high molecular polymer of propylene oxide.
Preferably, the molecular weight of the high molecular epoxide polymer is 300 to 800 ten thousand, and more preferably 500 to 700 ten thousand.
Preferably, the high molecular epoxide polymer is a high molecular polymer of ethylene oxide; more preferably, the high molecular weight polymer of ethylene oxide is polyoxyethylene.
Preferably, the addition amount of the high-molecular epoxide polymer is 1 to 3 wt%.
In an alternative embodiment, the polyol fatty acid ester is a synthetic ester of a polyol and a fatty acid.
The polyhydric alcohol includes any one of ethylene glycol, propylene glycol, glycerin or trimethylolpropane, and preferably, the polyhydric alcohol is ethylene glycol or trimethylolpropane.
The fatty acid comprises C8～C30Preferably, the fatty acid is C12～C20The fatty acid of (2).
The synthetic lipid includes any one of a monoester, a diester, or a triester, and preferably, the synthetic lipid is a monoester.
Preferably, the addition amount of the polyol fatty acid ester is 5 to 15 wt%.
In an alternative embodiment, the fatty alcohol-polyoxyethylene ether is an adduct of a fatty alcohol and ethylene oxide.
The fatty alcohol comprises C8～C24Preferably, the fatty alcohol is C12～C20At least one of the fatty alcohols of (a).
The number of ethylene oxide units is 5 to 50, preferably 15 to 30.
Preferably, the addition amount of the fatty alcohol-polyoxyethylene ether is 4-15 wt%.
In alternative embodiments, the solvent comprises any one of ethanol or deionized water.
Preferably, the solvent is deionized water.
Preferably, the solvent is added in an amount of 70 to 90 wt%.
In an alternative embodiment, a polyoxyethylene fatty alcohol dibasic acid ester is also included, the polyoxyethylene fatty alcohol dibasic acid ester having the formula:
R1O(CH2CH2O)mOOCR2COO(CH2CH2O)mR1。
wherein R is1Is C4～C20Alkyl of (2), preferably C4～C18Alkyl groups of (a); r2Is C4～C24Alkylene of (3), preferably C4～C20An alkylene group of (a).
m is 3 to 30, preferably 6 to 20;
the dibasic acid is single organic acid or mixed acid.
The addition amount of polyoxyethylene fatty alcohol dibasic acid ester is 0.5-5 wt%, preferably 1-2.5 wt%.
In a second aspect, the present invention provides a method for preparing a dispersant for aramid fiber paper as in any one of the preceding embodiments, including melt-mixing a polyol fatty acid ester, a fatty alcohol-polyoxyethylene ether, a high-molecular epoxide polymer, and a polyoxyethylene fatty alcohol dibasic acid ester in proportion to obtain a mixed solution, and dissolving the mixed solution in a solvent.
In an alternative embodiment, the melt mixing temperature is 100 to 150 ℃.
In an alternative embodiment, dissolving the mixed solution in the solvent includes adding the mixed solution to the solvent under heating and stirring.
Wherein the heating temperature is more than 80 ℃, and the stirring time is 20-30 min after the solvent is completely added into the mixed solution.
In a third aspect, the present invention provides a use of the dispersant for aramid fiber paper according to any one of the above embodiments in the production of aramid fiber paper, wherein the amount of the dispersant for aramid fiber paper is 0.01 to 0.4 wt% based on the dry weight of the aramid fiber.
The invention has the following beneficial effects:
the invention provides a dispersing agent for aramid fiber paper, which is characterized in that a high molecular weight polymer is added as one of main components of the dispersing agent, long molecular chains of the polymer are spread in a slurry suspension to prevent the surfaces of fibers from approaching each other, a layer of smooth and non-sticky hydrated film is formed on the surface of the fiber, so that the slurry keeps good suspension property, excellent dispersion effect is achieved, the dispersion of the aramid chopped fiber in water is effectively promoted, and effectively solves the problems of fiber cutting, performance damage, large foam amount, high content of fine fiber and the like caused by that the fiber raw material is not suitable to be overlong and the pulping time is overlong, thereby obtaining evenly dispersed fiber pulp suspension, reducing the detention of fiber on a forming net, improving the uniformity of fiber pulp and the tensile strength and the tearing strength of aramid fiber paper, meanwhile, the dispersant has good pyrolysis performance and cannot be left in the dried paper sheet to influence the original performance of the fiber.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
The aramid fiber is a synthetic fiber, and has the excellent performances of ultrahigh strength, high modulus, high temperature resistance, acid resistance, alkali resistance, light weight and the like. The strength of the steel wire is 5-6 times of that of the steel wire, the modulus of the steel wire is 2-3 times of that of the steel wire or glass fiber, the toughness of the steel wire is 2 times of that of the steel wire, and the weight of the steel wire is only about 1/5 of that of the steel wire. The paint does not decompose or melt at the high temperature of 560 ℃, has long life cycle, good insulation and ageing resistance and excellent application prospect.
However, compared with other chemical fibers, the aramid fiber has stronger hydrophobicity, particularly short fiber, and is easy to generate serious flocculation agglomeration. The dispersion effect of mechanical stirring is limited in the papermaking process, and new flocculation is generated in the dispersed fiber in the water filtration forming process, so that the uniformity and physical properties of paper sheets are influenced, and a special dispersing agent is required to be added to stabilize a pulp water dispersion system.
In a first aspect, the invention provides a dispersing agent for aramid fiber paper, which comprises 1-20 wt% of polyol fatty acid ester, 1-20 wt% of fatty alcohol-polyoxyethylene ether, 0.5-5 wt% of high-molecular epoxide polymer and 50-97 wt% of a solvent.
By adding high molecular weight polymer as one of the main components of the dispersant, the long molecular chains of the polymer spread in the slurry suspension to prevent the fiber surfaces from approaching each other, a layer of smooth and non-sticky hydrated film is formed on the surface of the fiber, so that the slurry keeps good suspension property, excellent dispersion effect is achieved, the dispersion of the aramid chopped fiber in water is effectively promoted, and effectively solves the problems of fiber cutting, performance damage, large foam amount, high content of fine fiber and the like caused by the fact that fiber raw materials are not suitable for being overlong and the pulping time is overlong, thereby obtaining evenly dispersed fiber pulp suspension, reducing the retention of fiber on a forming net, improving the uniformity of fiber pulp and the tensile strength and the tearing strength of aramid fiber paper, meanwhile, the dispersing agent has good pyrolysis performance, and cannot stay in a dried paper sheet for a long time to influence the original performance of the aramid fiber.
In alternative embodiments, the high molecular epoxide polymer comprises any of a high molecular polymer of ethylene oxide or a high molecular polymer of propylene oxide. The macromolecular epoxide polymer is a colloidal solution in the pulp suspension due to the long molecular chain, and can prevent paper fibers from agglomerating when unfolded, so that the aramid chopped fibers can be dispersed in the colloidal solution.
Preferably, in order to ensure a better dispersion effect of the aramid chopped fibers, the molecular weight of the high-molecular epoxy polymer is 300 to 800 ten thousand, and more preferably 500 to 700 ten thousand. For example, the high molecular weight epoxide polymer may have a molecular weight of 300, 400, 500, 550, 600, 650, 700, or 800 ten thousand.
Preferably, the high molecular epoxide polymer is a high molecular polymer of ethylene oxide; more preferably, the high molecular weight polymer of ethylene oxide is polyoxyethylene.
Preferably, in order to ensure a good dispersing effect and prevent the aramid fiber from being dispersed too well due to too low addition of the high-molecular epoxide polymer, the uniformity of the paper is affected, and the tensile strength and the tearing strength of the aramid fiber paper are improved, wherein the addition of the high-molecular epoxide polymer is 1-3 wt%. For example, the high molecular epoxide polymer may be added in an amount of 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, or 3 wt%.
In an alternative embodiment, the polyol fatty acid ester is a synthetic ester of a polyol and a fatty acid. The polyol fatty acid ester is added as a smoothing agent, and can smooth paper after being added, so that the fiber paper with smooth surface touch feeling is obtained.
The polyhydric alcohol includes any one of ethylene glycol, propylene glycol, glycerin or trimethylolpropane, and preferably, the polyhydric alcohol is ethylene glycol or trimethylolpropane.
The fatty acid comprises C8～C30Preferably, the fatty acid is C12～C20The fatty acid of (2).
The synthetic lipid includes any one of a monoester, a diester, or a triester, and preferably, the synthetic lipid is a monoester. For example, glycol lauric acid diester, glycerin stearic acid monoester, and the like are preferable.
Preferably, the polyol fatty acid ester is added in an amount of 5 to 15 wt% for better smoothing effect.
In an alternative embodiment, the fatty alcohol polyoxyethylene ether is an adduct of a fatty alcohol and ethylene oxide. The fatty alcohol-polyoxyethylene ether is used as an emulsifier to be dispersed in the dispersing agent solution, so that raw material components form uniform emulsion, the interfacial tension of each component in the dispersing agent solution is reduced, the dispersion effect of the high-molecular epoxy polymer is matched, the agglomeration of aramid chopped fibers is avoided, and the tensile strength and the tearing strength of the aramid fiber paper are improved.
The fatty alcohol comprises C8～C24Preferably, the fatty alcohol is C12～C20At least one of the fatty alcohols of (a).
The number of ethylene oxide units is 5 to 50, preferably 15 to 30.
Preferably, in order to ensure uniform dispersion of the dispersing agent and reduce agglomeration of the aramid chopped fibers, the addition amount of the fatty alcohol-polyoxyethylene ether is 4-15 wt%.
In alternative embodiments, the solvent comprises any one of ethanol or deionized water.
Preferably, the solvent is deionized water.
Preferably, the solvent is added in an amount of 70 to 90 wt%.
In an alternative embodiment, in order to endow the aramid fiber paper with better surface tactility, the raw material further comprises polyoxyethylene fatty alcohol dibasic acid ester, and the formula of the polyoxyethylene fatty alcohol dibasic acid ester is as follows:
R1O(CH2CH2O)mOOCR2COO(CH2CH2O)mR1。
wherein R is1Is C4～C20Alkyl of (2), preferably C4～C18Alkyl groups of (a); r is2Is C4～C24Alkylene of (3), preferably C4～C20An alkylene group of (2).
m is 3 to 30, preferably 6 to 20. It is understood that m is the number of polyoxyethylene units, for example, in polyoxyethylene fatty alcohol dibasic acid ester, the number of polyoxyethylene units is 3 to 30, preferably 6 to 20.
The dibasic acid is single organic acid or mixed acid.
The addition amount of the polyoxyethylene fatty alcohol dibasic acid ester is 0.5-5 wt%, preferably 1-2.5 wt%.
In a second aspect, the present invention provides a method for preparing a dispersant for aramid fiber paper as in any one of the preceding embodiments, including melt-mixing a polyol fatty acid ester, a fatty alcohol-polyoxyethylene ether, a high-molecular epoxide polymer, and a polyoxyethylene fatty alcohol dibasic acid ester in proportion to obtain a mixed solution, and dissolving the mixed solution in a solvent.
In an alternative embodiment, the melt mixing temperature is 100 to 150 ℃.
In an alternative embodiment, dissolving the mixed solution in the solvent comprises adding the mixed solution to the solvent with heating and stirring.
Wherein the heating temperature is higher than 80 ℃, the mixed solution is completely added with the solvent and stirred for 20-30 min, and a white paste is obtained at room temperature.
In a third aspect, the present invention provides a use of the dispersant for aramid fiber paper according to any one of the above embodiments in the preparation of aramid fiber paper, wherein the amount of the dispersant for aramid fiber paper added is generally 0.01 to 0.4 wt% of the dry weight of the aramid fiber based on the mass of the dry fiber.
When the addition amount of the dispersing agent is lower than the range, the aramid fiber paper has low tensile strength, low tear resistance and low paper evenness; when the addition amount of the dispersing agent is higher than the range, the viscosity of a fiber paper pulp system is rapidly increased, the degree of freedom of movement of the aramid fiber in water is limited, the water filtration speed of the pulp in paper industry forming is reduced, the water filtration time is increased, the dispersing performance of the pulp is reduced, and the tensile strength and the tear resistance of the prepared paper are reduced on the contrary.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a dispersant for aramid fiber paper, which comprises the following components: 5 wt% of glycol lauric diester, 14 wt% of fatty alcohol-polyoxyethylene ether, 4 wt% of polyoxyethylene, 2 wt% of polyoxyethylene lauryl ether succinate and 75 wt% of water.
In the embodiment, the fatty alcohol in the fatty alcohol-polyoxyethylene ether is a mixed fatty alcohol of C14-20, and the number of units of ethylene oxide is 20; the molecular weight of the polyoxyethylene is 400 ten thousand; the polyoxyethylene lauryl ether succinate has polyoxyethylene unit number of 10.
The preparation method comprises the following steps:
and melting and mixing glycol lauric acid diester, fatty alcohol polyoxyethylene ether, polyoxyethylene and polyoxyethylene lauryl ether succinate according to the proportion to obtain a mixed solution, wherein the temperature of melting and mixing is 100 ℃.
Continuously stirring the solvent at the heating temperature of 85 ℃, adding the mixed solution into the solvent, stirring for 20min after the mixed solution is completely added, and obtaining a white paste at room temperature, namely the dispersing agent for the aramid fiber paper provided by the embodiment.
Example 2
The embodiment provides a dispersant for aramid fiber paper, which comprises the following components: 15 wt% of glycerol stearate monoester, 10 wt% of fatty alcohol-polyoxyethylene ether, 1.5 wt% of polyoxyethylene, 1 wt% of polyoxyethylene butyl ether succinate and 72.5 wt% of water.
In the embodiment, the fatty alcohol in the fatty alcohol-polyoxyethylene ether is a mixed fatty alcohol of C12-18, and the unit number of the ethylene oxide is 30; the molecular weight of the polyoxyethylene is 700 ten thousand; the unit number of polyoxyethylene in polyoxyethylene lauryl ether succinate is 20.
The preparation method comprises the following steps:
the glycerol stearate monoester, the fatty alcohol polyoxyethylene ether, the polyoxyethylene and the polyoxyethylene butanol ether succinate are melted and mixed according to the proportion to obtain a mixed solution, and the temperature of melting and mixing is 115 ℃.
Under the condition that the heating temperature is 85 ℃, the solvent is continuously stirred, the mixed solution is added into the solvent, the mixed solution is stirred for 30min after being completely added, and a white paste is obtained at room temperature, namely the dispersing agent for the aramid fiber paper provided by the embodiment.
Comparative example 1
This comparative example provides a dispersant for aramid fiber paper, which is the same as example 1 in terms of raw materials and preparation method, except that 0.5 wt% of polyoxyethylene having a molecular weight of 400 ten thousand is contained in the system, and the content of solvent water is 78.5%. Melting and mixing the raw materials at 100 deg.C to obtain a mixture, adding the mixture into solvent at 85 deg.C, stirring for 20min, and collecting white paste at room temperature.
Test example 1
Aramid 1414 chopped fibers (5 mm in length and 15 μm in diameter) were treated with the dispersant for aramid fiber paper prepared in examples 1 to 2 and comparative example 1, and the sheet basis weight was 40g/m2The dosage of the dispersant is 0.01-0.4 wt% of the dry weight of the short-cut aramid fiber 1414, and the performances of the aramid fiber paper after papermaking and hot pressing are shown in tables 1-3.
Table 1 properties of dispersant treated aramid fiber paper of example 1
Amount of dispersant (%) 0.05 0.1 0.2 0.35
Tensile Strength (kN/m) 2.63 2.72 2.79 2.75
Tear Rate (N) 1.60 1.75 1.89 1.92
Uniformity (appearance) In general Uniformity Uniformity Uniformity
Table 2 properties of dispersant treated aramid fiber paper of example 2
Amount of dispersant (%) 0.05 0.1 0.2 0.35
Tensile Strength (kN/m) 2.58 2.69 2.8 2.73
Tear Rate (N) 1.57 1.72 1.86 1.89
Uniformity (appearance) In general terms Uniformity Uniformity Uniformity
Table 3 properties of the dispersant treated aramid fiber paper of comparative example 1
Amount of dispersant (%) 0.05 0.1 0.2 0.35
Tensile Strength (kN/m) 2.04 2.13 2.18 2.27
Tear resistance (N) 1.15 1.19 1.30 1.46
Uniformity (appearance) Unevenness of the coating Unevenness of the coating In general terms Uniformity
The dispersing agent for the aramid fiber paper provided by the invention at least has the following advantages:
by adding the high molecular weight polymer as one of the main components of the dispersing agent, long molecular chains of the polymer are stretched in the slurry suspension, so that the surfaces of fibers can be prevented from approaching each other, a layer of smooth and non-sticky hydrated film is formed on the surfaces of the fibers, the slurry keeps good suspension, an excellent dispersing effect is achieved, the dispersion of the aramid chopped fibers in water is effectively promoted, the problems that the fibers are cut due to the fact that fiber raw materials are not too long and the beating time is too long, the performance is damaged, the foam quantity is large, the content of fine fibers is high and the like are effectively solved, the uniformly dispersed fiber slurry suspension is obtained, the retention of the fibers on a forming net is reduced, the uniformity and the performance of the materials are improved, and meanwhile, the dispersing agent has good pyrolysis performance, and cannot remain in dried paper sheets to influence the original performance of the fibers.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The dispersing agent for the aramid fiber paper is characterized by comprising 1-20 wt% of polyol fatty acid ester, 1-20 wt% of fatty alcohol-polyoxyethylene ether, 0.5-5 wt% of high-molecular epoxide polymer and 50-97 wt% of a solvent.
2. The dispersant of claim 1, wherein the high molecular epoxide polymer comprises any of a high molecular polymer of ethylene oxide or a high molecular polymer of propylene oxide;
preferably, the molecular weight of the high-molecular epoxide polymer is 300-800 ten thousand, and more preferably 500-700 ten thousand;
preferably, the high molecular epoxide polymer is a high molecular polymer of ethylene oxide; more preferably, the high molecular polymer of ethylene oxide is polyoxyethylene;
preferably, the addition amount of the high-molecular epoxide polymer is 1-3 wt%.
3. The dispersant of claim 1, wherein the polyol fatty acid ester is a synthetic ester of a polyol and a fatty acid;
the polyhydric alcohol comprises any one of ethylene glycol, propylene glycol, glycerol or trimethylolpropane, preferably the polyhydric alcohol is ethylene glycol or trimethylolpropane;
the fatty acid comprises C8～C30Preferably, the fatty acid has a carbon atom number of C12～C20The fatty acid of (a);
the synthetic lipid comprises any one of monoester, diester or triester, preferably, the synthetic lipid is monoester;
preferably, the addition amount of the polyol fatty acid ester is 5 to 15 wt%.
4. The dispersing agent according to claim 1, wherein the fatty alcohol-polyoxyethylene ether is an adduct of a fatty alcohol and ethylene oxide;
the fatty alcohol comprises C8～C24Preferably, the fatty alcohol is a C12～C20At least one of the fatty alcohols of (a);
the number of units of the ethylene oxide is 5-50, preferably 15-30;
preferably, the addition amount of the fatty alcohol-polyoxyethylene ether is 4-15 wt%.
5. The dispersant of claim 1, wherein the solvent comprises any one of ethanol or deionized water;
preferably, the solvent is deionized water;
preferably, the addition amount of the solvent is 70 to 90 wt%.
6. The dispersant of any one of claims 2 to 5, further comprising a polyoxyethylene fatty alcohol dibasic acid ester of the formula:
R1O(CH2CH2O)mOOCR2COO(CH2CH2O)mR1
wherein R is1Is C4～C20Is preferably C4～C18Alkyl groups of (a);
R2is C4～C24Alkylene of (3), preferably C4～C20An alkylene group of (a);
m is 3 to 30, preferably 6 to 20;
the dibasic acid is single organic acid or mixed acid;
the addition amount of the polyoxyethylene fatty alcohol dibasic acid ester is 0.5-5 wt%, and preferably 1-2.5 wt%.
7. A preparation method of the dispersing agent for the aramid fiber paper as defined in any one of claims 1 to 6, wherein the preparation method comprises the steps of melting and mixing the polyol fatty acid ester, the fatty alcohol-polyoxyethylene ether, the high-molecular epoxide polymer and the polyoxyethylene fatty alcohol dibasic acid ester in proportion to obtain a mixed solution, and dissolving the mixed solution in the solvent.
8. The method according to claim 7, wherein the melt-mixing temperature is 100 to 150 ℃.
9. The production method according to claim 7, wherein the dissolving of the mixed solution in the solvent includes adding the mixed solution to the solvent under heating and stirring;
the heating temperature is higher than 80 ℃, and the stirring time is 20-30 min after the mixed solution is completely added into the solvent.
10. The application of the dispersing agent for the aramid fiber paper as defined in any one of claims 1 to 6 in preparing the aramid fiber paper, wherein the addition amount of the dispersing agent for the aramid fiber paper is 0.01 to 0.4 wt% of the dry weight of the aramid fiber.
CN202210348474.XA 2022-04-01 2022-04-01 Dispersing agent for aramid fiber paper and preparation method and application thereof Pending CN114775325A (en)

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Citations (6)

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