CN110578256A - Anti-wrinkle finishing agent for cotton fabrics, preparation method and finishing process - Google Patents
Anti-wrinkle finishing agent for cotton fabrics, preparation method and finishing process Download PDFInfo
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- CN110578256A CN110578256A CN201910982461.6A CN201910982461A CN110578256A CN 110578256 A CN110578256 A CN 110578256A CN 201910982461 A CN201910982461 A CN 201910982461A CN 110578256 A CN110578256 A CN 110578256A
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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
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
- D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
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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
- D06M15/568—Reaction products of isocyanates with polyethers
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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
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
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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
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/20—Treatment influencing the crease behaviour, the wrinkle resistance, the crease recovery or the ironing ease
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
the invention relates to a finishing agent and the technical field of preparation and application thereof, in particular to a cotton fabric anti-wrinkle finishing agent, a preparation method and a finishing process, wherein the preparation method comprises the steps of kneading microcrystalline cellulose and low molecular weight polycaprolactone, kneading the kneaded materials with polyether polyol, diisocyanate and a catalyst again, kneading the kneaded materials with silicon dioxide aerogel, grinding the kneaded materials under the condition of liquid nitrogen freezing to obtain shape memory composite powder, mixing and dispersing the shape memory composite powder and a finishing agent emulsion to obtain the cotton fabric anti-wrinkle finishing agent, and the finishing process comprises the steps of soaking cotton fabrics in alkali liquor, and pad-dyeing the cotton fabric anti-wrinkle finishing agent to obtain the finished cotton fabrics.
Description
Technical Field
the invention relates to the technical field of finishing agents and preparation and application thereof, in particular to a crease-resistant finishing agent for cotton fabrics, a preparation method and a finishing process.
background
fabric finishing is the application of a finishing agent to a fabric which alters the surface properties of the fabric to impart specific functions to the fabric. For example, hydrophobic and oleophobic finishes are achieved by treating the fabric with a finish having a low surface tension to modify the surface characteristics of the fibers so that the fabric surface is not readily wetted and spread by water or oil. The antifouling finish and the easy-to-remove finish are processing technologies which change the surface performance or the surface state of the fiber, so that the fabric is not easy to adhere dirt under the wearing and using conditions, or the adhered dirt is easy to wash.
With the improvement of living standard of people and the requirement of health and environmental protection, the textile made of natural fibers gradually becomes a normal state. Cotton fiber has many advantages of softness, skin friendliness, air permeability, moisture absorption and the like, and textiles of the cotton fiber are favored by more and more people. However, cotton textiles have the defects of easy wrinkling and easy shrinkage, and are easy to deform, wrinkle and shrink due to continuous external force action in the processes of printing and dyeing processing and clothing washing. The reason for wrinkling is mainly caused by the performance of the cotton fiber material, the main component of the cotton fiber is cellulose, the molecular orientation degree of the cellulose is high, cellulose molecules are easy to move when the cotton fiber is washed, kneaded, worn and laminated, new hydrogen bonds are formed and fixed, and after external force is removed, the cellulose molecular hydrogen bonds cannot automatically return to the original positions, so that more wrinkles are generated.
In order to avoid the generation of wrinkles, the conventional method is to blend cotton fibers and chemical fibers, for example, polyester-cotton fabric is polyester-cotton blended fabric, and the problem of poor wrinkle resistance of cotton fabric is solved by using the wrinkle resistance of polyester and cotton fibers to weave textiles. However, the polyester-cotton blended fabric has the advantages of not good hand feeling and not good air permeability and sweat absorption.
the cotton fabric is plastically deformed to form wrinkles when being kneaded and extruded, and the cotton fabric with creases is difficult to restore to the original state due to the characteristics of the cotton fabric fibers. At present, N-hydroxymethyl amide resin, such as 2D resin commonly applied in industry, is mainly used as the crease-resistant finishing agent of cotton fiber fabrics. Although the 2D resin has better crease-resistant finishing property on cotton fabrics, the 2D resin has the disadvantages of formaldehyde release and poor permeability, so that the 2D resin is harmful to human health, and the resin is coated on the periphery of fibers to reduce the handfeel of cotton. The aldehyde-free crease-resistant finishing agent is the development direction of the existing cotton fabric finishing, and the prior art reports that the good crease-resistant treatment can be realized by adopting polybasic acid. BTCH and citric acid have better effects in polybasic acid, wherein BTCH has better crease-resistant effect but higher price; the citric acid is low in price and easy to apply on a large scale, but the citric acid has the problems of low crosslinking degree and washability, so that the citric acid is still insufficient for the anti-wrinkle finishing of cotton fabrics.
at present, the demand of pure cotton textiles is rapidly increased, and the research of efficient cotton fabric anti-wrinkle finishing agents becomes a key point. The shape memory material can be heated to a certain temperature after being processed and shaped, is deformed under the action of external force, has the shape memory function in a deformed state, and can automatically return to an initial memory state when reaching the temperature condition of the initial shape memory. The method has great potential for solving the problem of crease resistance of cotton fabrics. For example, the polyurethane-based shape memory material is spun and then blended in cotton fabric to achieve the purpose of wrinkle resistance. However, this method is complicated in process and requires a large amount of polyurethane to be mixed into textile products. The polyurethane-based shape memory material is expected to be prepared into a finishing agent in a coating state, however, the shape memory is a composite state of high polymer soft-hard phases, and the polyurethane prepared into emulsion does not have the function, so that the polyurethane shape memory material is limited to be used for resisting wrinkles in cotton textiles in a liquid finishing agent mode.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a crease-resistant finishing agent for cotton fabrics, a preparation method and a finishing process, which solve the problem that the cotton fabrics are easy to crease in the prior art, and the invention inlays low-molecular-weight polycaprolactone and microcrystalline cellulose in polyurethane in the polyurethane polymerization process to form a pasty material with shape memory at 30 ~ 40 ℃, so that the cotton fabrics can recover the memorized initial shape at 30 ~ 40 ℃, namely the memorized flat state at 30 ~ 40 ℃, and the flat state of the cotton fabrics is kept.
The purpose of the invention is realized by the following technical scheme:
A preparation method of a cotton fabric anti-wrinkle finishing agent comprises the following steps:
Mixing microcrystalline cellulose and low molecular weight polycaprolactone, kneading for the first time to obtain paste, adding polyether polyol, diisocyanate and a catalyst into the paste, and kneading for the second time;
step two, mixing the shape memory composite paste material obtained in the step one with silicon dioxide aerogel according to the mass ratio of 2 (0.1 ~ 0.5), kneading for the third time to obtain paste, standing for at least 30min, and grinding under the condition of liquid nitrogen freezing to obtain shape memory composite powder;
and step three, mixing and dispersing the shape memory composite powder and the finishing agent emulsion in the step two according to the mass ratio of 1 (5 ~ 10) to obtain the anti-wrinkle finishing agent for the cotton fabric.
The shape memory material refers to a material having a function of returning to an original shape. At present, polyurethane-based shape memory materials are compounded in textile varieties to achieve the purpose of wrinkle resistance, for example, the polyurethane-based shape memory materials are blended in cotton fabrics after spinning to achieve the purpose of wrinkle resistance. But the process of the method is complicated. The invention realizes the purpose of wrinkle resistance of cotton fabrics by preparing the finishing agent with shape memory.
in the polyurethane polymerization process, low molecular weight polycaprolactone and microcrystalline cellulose are embedded in polyurethane to form a pasty material with a shape memory function at 30 ~ 40 ℃, then the pasty material is filled in micropores of silicon dioxide aerogel, and finally the pasty material is ground into powder under the freezing of liquid nitrogen, so that the shape memory material is powdered.
The microcrystalline cellulose is uniformly embedded in polyurethane during polyurethane polymerization, has excellent water absorption and flexibility, and is used in a finishing agent for compensating and finishing the hardness of the cotton-making fabric.
polycaprolactone is a semi-crystalline polymer embedded in polyurethane, and has a reversible phase of softening-hardening reversible change due to the existence of two incompletely compatible phases in the material, so that the polycaprolactone has a shape memory function within the temperature range of 30 ~ 40 ℃.
when the cotton fabric is made into clothes and is worn, washed and kneaded to form wrinkles, the fibers and the surface of the cotton fabric are finished by the shape memory coating, the cotton fabric can recover the memorized initial shape at the ambient temperature of 30 ~ 40 ℃, namely the memorized flat state at 30 ~ 40 ℃, so that the flat state of the cotton fabric is kept.
Further, the temperature of the first kneading in the first step is 50 ~ 60 ℃, and the time of the first kneading is 30 ~ 60 min;
The temperature of the second kneading in the first step is 70 ~ 80 ℃, and the time of the second kneading is 1 ~ 2 h;
the temperature of kneading for the third time in the second step is 50 ~ 60 ℃, and the kneading time is 1 ~ 2 h.
The materials are kneaded and mixed uniformly for a plurality of times, wherein the time and the temperature of each kneading are correspondingly designed according to the mixing difficulty of the materials to be kneaded.
Further preferably, the mass ratio of the microcrystalline cellulose, the low molecular weight polycaprolactone, the polyether polyol, the diisocyanate and the catalyst in the step one is 1 (4 ~ 5): 3 ~ 4: (2 ~ 3): 0.002 ~ 0.004.004);
In the second step, the mass ratio of the shape memory composite paste material to the silicon dioxide aerogel is 2 (0.3 ~ 0.4.4);
the mass ratio of the shape memory composite powder to the finishing agent emulsion in the third step is 1 (7 ~ 8).
Embedding low molecular weight polycaprolactone and microcrystalline cellulose in polyurethane to form a pasty material with a shape memory function at the temperature of 30 ~ 40 ℃, filling the pasty material into micropores of silicon dioxide aerogel, and finally grinding the pasty material into powder under the freezing condition of liquid nitrogen so as to realize the powdering of the shape memory material.
Further preferably, the number average molecular weight of the low molecular weight polycaprolactone in the first step is 500 ~ 1200, and the hydroxyl value is 150 ~ 220 mgKOH/g;
In the first step, the polyether polyol is at least one of trimethylolpropane polyether, polyoxypropylene diol, polyoxypropylene triol and polytetrahydrofuran diol;
the diisocyanate in the first step is at least one of diphenylmethane diisocyanate and toluene diisocyanate;
And in the first step, the catalyst is dibutyltin laurate.
by controlling the number average molecular weight and the force of the low molecular weight polycaprolactone, the low molecular weight polycaprolactone and the microcrystalline cellulose can be better embedded in polyurethane, and the material utilization rate is improved.
further preferably, the number average molecular weight of the low molecular weight polycaprolactone in the first step is 500 ~ 800, the hydroxyl value is 160 ~ 200 mgKOH/g, and the polyether polyol in the first step is polyoxypropylene glycol.
further preferably, the porosity of the silica aerogel in the second step is more than or equal to 70 percent; and in the second step, the particle size of the shape memory composite powder is less than or equal to 0.05 mm. The porosity of the silica aerogel is controlled, and the silica aerogel with larger porosity is selected as far as possible, so that the loading capacity of the silica aerogel can be improved, the loading rate of the shape memory composite paste material in micropores of the silica aerogel is improved, and the utilization rate of the shape memory composite paste material is improved. The excellent porosity of the silica aerogel enables the shape memory composite paste material to be fully absorbed in the kneading process, and the purpose of the silica aerogel for absorbing the shape memory composite paste material is to enable the shape memory material to be ground into fine particles so as to be convenient for dispersion in a finishing agent.
Further, the finishing agent emulsion in the third step is at least one of organosilicon modified polyurethane emulsion, ethylene-vinyl acetate copolymer emulsion and silicon-containing acrylate core-shell emulsion.
preferably, the finishing agent emulsion in the third step is prepared by mixing organosilicon modified polyurethane emulsion, ethylene-vinyl acetate copolymer emulsion and silicon-containing acrylate core-shell emulsion according to the mass ratio of 1 (2 ~ 4) to (0.3 ~ 0.8.8).
The cotton fabric anti-wrinkle finishing agent is prepared by the preparation method.
An application method of a cotton fabric anti-wrinkle finishing agent is characterized in that: soaking cotton fabric in alkali liquor, then passing through a finishing agent, soaking twice and rolling twice, wherein the pressure is 1-2kgf/cm2, the liquid carrying rate is 60% -80%, pre-drying the finished cotton fabric at 80-100 ℃, flattening through a flattening roller, drying, and flattening through a compression roller at 40 ℃ and 30 ℃ in sequence, so that the cotton fabric forms a flattened initial shape at the temperature of 30-40 ℃.
When the shape memory composite powder is dispersed in the emulsion to be used as a finishing agent, the cotton fabric is bonded with the silica aerogel due to the soaking treatment of the cotton fabric alkali liquor, wherein the silica aerogel is used as a microporous material for loading shape memory, and then the shape memory composite powder and the cotton fabric are bonded into a whole in an auxiliary manner.
the invention has the advantages that in the polyurethane polymerization process, low molecular weight polycaprolactone and microcrystalline cellulose are embedded in polyurethane to form a pasty material with a shape memory function at 30 ~ 40 ℃, then the pasty material is filled in micropores of silicon dioxide aerogel, finally the pasty material is ground into powder under the freezing of liquid nitrogen, so that the shape memory material is powdered, when the shape memory composite powder is dispersed in emulsion as a finishing agent, cotton fabrics are bonded with the silicon dioxide aerogel due to the soaking treatment of alkaline liquor of the cotton fabrics, wherein the silicon dioxide aerogel is used as a microporous material for loading shape memory, and then the shape memory composite powder is bonded with the cotton fabrics into a whole, when the cotton fabrics are made into cotton fabrics which are worn, washed and kneaded to form folds, the fibers and the surfaces of the cotton fabrics are finished by the shape memory coating, and the cotton fabrics can recover the memorized initial shape at the environment temperature of 30 ~ 40 ℃, namely the shape memory flat state at 30 ~ 40 ℃, so that the flat state of the cotton fabrics is maintained, if the cotton fabrics are used for preparing the cotton fabrics, the human body temperature is just the shape memory temperature of the cotton fabrics, and the cotton fabrics can recover the shape memory temperature of the cotton fabrics at the close fitting temperature of the cotton fabrics.
Drawings
FIG. 1 is a crease pattern of a 1mm thick pure cotton fabric treated in example 1 after folding and pressing.
FIG. 2 is a crease pattern of a 1mm thick pure cotton fabric treated in comparative example 1 after folding and pressing.
Detailed Description
the present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
example 1
A preparation method of a cotton fabric anti-wrinkle finishing agent comprises the following steps:
step one, mixing microcrystalline cellulose and low molecular weight polycaprolactone, kneading for the first time to obtain a paste, wherein the temperature of the first kneading is 50 ℃, the time of the first kneading is 60min, adding polyether polyol, diisocyanate and a catalyst, namely succinic acid, butyltin laurate into the paste to carry out a second kneading reaction, the temperature of the second kneading is 70 ℃, the time of the second kneading is 2h, and the mass ratio of the microcrystalline cellulose to the low molecular weight polycaprolactone to the polyether polyol to the diisocyanate to the catalyst is 1: 5: 3: 2: 0.00, obtaining the shape memory composite paste material;
step two, mixing the shape memory composite paste material and the silicon dioxide aerogel in the step one according to the mass ratio of 2: 0.1, mixing, kneading for the third time to obtain paste, wherein the kneading temperature for the third time is 50 ℃, the kneading time is 2h, standing for at least 30min, and grinding under the condition of liquid nitrogen freezing to obtain shape memory composite powder;
step three, mixing the shape memory composite powder and the finishing agent emulsion in the step two according to the mass ratio of 1: 5, mixing and dispersing to obtain the anti-wrinkle finishing agent for the cotton fabrics.
specifically, the number average molecular weight of the low molecular weight polycaprolactone in the first step is 800, and the hydroxyl value is 150 mgKOH/g;
In the first step, the polyether polyol is trimethylolpropane polyether;
The diisocyanate in the first step is diphenylmethane diisocyanate;
The porosity of the silicon dioxide aerogel in the second step is more than or equal to 70 percent; the grain diameter of the shape memory composite powder in the second step is less than or equal to 0.05 mm;
And the finishing agent emulsion in the third step is organic silicon modified polyurethane emulsion.
A finishing process for cotton fabrics comprises soaking cotton fabrics in alkali liquor, and performing double-soaking and double-rolling with the anti-wrinkle finishing agent under pressure of 1kgf/cm2The liquid carrying rate is 60 percent, the cotton fabric is pre-dried at the temperature of 80 ℃, pre-leveled on a leveling roller, and pressed and leveled by pressing rollers at the temperature of 40 ℃ and 30 ℃ in sequence after being dried, and the finished cotton fabric is obtained.
example 2
a preparation method of a cotton fabric anti-wrinkle finishing agent comprises the following steps:
Step one, mixing microcrystalline cellulose and low molecular weight polycaprolactone, kneading for the first time to obtain a paste, wherein the temperature of the first kneading is 60 ℃, the time of the first kneading is 30min, adding polyether polyol, diisocyanate and a catalyst, namely succinic acid, butyltin laurate into the paste to carry out a second kneading reaction, the temperature of the second kneading is 80 ℃, the time of the second kneading is 1h, and the mass ratio of the microcrystalline cellulose to the low molecular weight polycaprolactone to the polyether polyol to the diisocyanate to the catalyst is 1: 5: 4: 3: 0.003, obtaining the shape memory composite paste material;
Step two, mixing the shape memory composite paste material and the silicon dioxide aerogel in the step one according to the mass ratio of 2: 0.5 mixing, kneading for the third time to obtain paste, wherein the kneading temperature for the third time is 60 ℃, the kneading time is 1h, standing for at least 30min, and grinding under the condition of liquid nitrogen freezing to obtain shape memory composite powder;
step three, mixing the shape memory composite powder and the finishing agent emulsion in the step two according to the mass ratio of 1: 10, mixing and dispersing to obtain the anti-wrinkle finishing agent for the cotton fabrics.
Specifically, the number average molecular weight of the low molecular weight polycaprolactone in the first step is 1000, and the hydroxyl value is 180 mgKOH/g;
in the first step, polyether polyol is polyoxypropylene triol;
The diisocyanate in the first step is toluene diisocyanate;
The porosity of the silicon dioxide aerogel in the second step is more than or equal to 70 percent; the grain diameter of the shape memory composite powder in the second step is less than or equal to 0.05 mm;
And the finishing agent emulsion in the third step is ethylene-vinyl acetate copolymer emulsion.
A finishing process for cotton fabrics comprises soaking cotton fabrics in alkali liquor, and performing double-soaking and double-rolling with the anti-wrinkle finishing agent under pressure of 2kgf/cm2The liquid carrying rate is 80 percent, the cotton fabric is pre-dried at the temperature of 100 ℃, pre-leveled on a leveling roller, and pressed and leveled by pressing rollers at the temperature of 40 ℃ and 30 ℃ in sequence after being dried, and the finished cotton fabric is obtained.
example 3
A preparation method of a cotton fabric anti-wrinkle finishing agent comprises the following steps:
Step one, mixing microcrystalline cellulose and low molecular weight polycaprolactone, kneading for the first time to obtain a paste, wherein the temperature of the first kneading is 50 ℃, the time of the first kneading is 30min, adding polyether polyol, diisocyanate and a catalyst, namely succinic acid, butyltin laurate into the paste to carry out a second kneading reaction, the temperature of the second kneading is 70 ℃, the time of the second kneading is 2h, and the mass ratio of the microcrystalline cellulose to the low molecular weight polycaprolactone to the polyether polyol to the diisocyanate to the catalyst is 1: 4: 3: 3: 0.004, thus obtaining the shape memory composite paste material;
Step two, mixing the shape memory composite paste material and the silicon dioxide aerogel in the step one according to the mass ratio of 2: 0.2 mixing, kneading for the third time to obtain paste, wherein the kneading temperature for the third time is 50 ℃, the kneading time is 2h, standing for at least 30min, and grinding under the condition of liquid nitrogen freezing to obtain shape memory composite powder;
Step three, mixing the shape memory composite powder and the finishing agent emulsion in the step two according to the mass ratio of 1: 6, mixing and dispersing to obtain the anti-wrinkle finishing agent for the cotton fabrics.
Specifically, the number average molecular weight of the low molecular weight polycaprolactone in the first step is 600, and the hydroxyl value is 150 mgKOH/g;
in the first step, polyether polyol is polytetrahydrofuran diol;
in the first step, diisocyanate is less than one of diphenylmethane diisocyanate;
the porosity of the silicon dioxide aerogel in the second step is more than or equal to 70 percent; the grain diameter of the shape memory composite powder in the second step is less than or equal to 0.05 mm;
the finishing agent emulsion in the third step is prepared from organic silicon modified polyurethane emulsion, ethylene-vinyl acetate copolymer emulsion and silicon-containing acrylate core-shell emulsion according to the mass ratio of 1: 2: 0.3, and mixing.
A finishing process for cotton fabrics comprises soaking cotton fabrics in alkali liquor, and performing double-soaking and double-rolling with the anti-wrinkle finishing agent under pressure of 1kgf/cm2the liquid carrying rate is 70 percent, the cotton fabric is pre-dried at the temperature of 90 ℃, pre-leveled on a leveling roller, and pressed and leveled by pressing rollers at the temperature of 40 ℃ and 30 ℃ in sequence after being dried, and the finished cotton fabric is obtained.
Example 4
a preparation method of a cotton fabric anti-wrinkle finishing agent comprises the following steps:
step one, mixing microcrystalline cellulose and low molecular weight polycaprolactone, kneading for the first time to obtain a paste, wherein the temperature of the first kneading is 65 ℃, the time of the first kneading is 45min, adding polyether polyol, diisocyanate and a catalyst of succinic acid and tin dichloride into the paste, and then carrying out a second kneading reaction, wherein the temperature of the second kneading is 75 ℃, the time of the second kneading is 1.5h, and the mass ratio of the microcrystalline cellulose to the low molecular weight polycaprolactone to the polyether polyol to the diisocyanate to the catalyst is 1: 5: 4: 2: 0.002, obtaining the shape memory composite paste material;
Step two, mixing the shape memory composite paste material and the silicon dioxide aerogel in the step one according to the mass ratio of 2: 0.3 mixing, kneading for the third time to obtain paste, kneading at 55 deg.C for 1.5h, standing for at least 30min, and grinding under liquid nitrogen freezing condition to obtain shape memory composite powder;
Step three, mixing the shape memory composite powder and the finishing agent emulsion in the step two according to the mass ratio of 1: 8, mixing and dispersing to obtain the anti-wrinkle finishing agent for the cotton fabrics.
specifically, the number average molecular weight of the low molecular weight polycaprolactone in the first step is 700, and the hydroxyl value is 180 mgKOH/g;
in the first step, the polyether polyol is polyoxypropylene glycol;
The diisocyanate in the first step is diphenylmethane diisocyanate;
The porosity of the silicon dioxide aerogel in the second step is more than or equal to 70 percent; the grain diameter of the shape memory composite powder in the second step is less than or equal to 0.05 mm;
the finishing agent emulsion in the third step is prepared from organic silicon modified polyurethane emulsion, ethylene-vinyl acetate copolymer emulsion and silicon-containing acrylate core-shell emulsion according to the mass ratio of 1: 4: 0.8, and mixing.
a finishing process for cotton fabrics comprises soaking cotton fabrics in alkali liquor, and performing double-soaking and double-rolling with the anti-wrinkle finishing agent under pressure of 1kgf/cm2the liquid carrying rate is 70 percent, the cotton fabric is pre-dried at the temperature of 90 ℃, pre-leveled on a leveling roller, and pressed and leveled by pressing rollers at the temperature of 40 ℃ and 30 ℃ in sequence after being dried, and the finished cotton fabric is obtained.
Example 5
A preparation method of a cotton fabric anti-wrinkle finishing agent comprises the following steps:
Step one, mixing microcrystalline cellulose and low molecular weight polycaprolactone, kneading for the first time to obtain a paste, wherein the temperature of the first kneading is 55 ℃, the time of the first kneading is 60min, adding polyether polyol, diisocyanate and a catalyst of succinic acid and tin dichloride into the paste, and then carrying out a second kneading reaction, wherein the temperature of the second kneading is 75 ℃, the time of the second kneading is 2h, and the mass ratio of the microcrystalline cellulose to the low molecular weight polycaprolactone to the polyether polyol to the diisocyanate to the catalyst is 1: 5: 4: 3: 0.003, obtaining the shape memory composite paste material;
step two, mixing the shape memory composite paste material and the silicon dioxide aerogel in the step one according to the mass ratio of 2: 0.4, mixing, kneading for the third time to obtain paste, wherein the kneading temperature for the third time is 55 ℃, the kneading time is 2h, standing for at least 30min, and grinding under the condition of liquid nitrogen freezing to obtain shape memory composite powder;
step three, mixing the shape memory composite powder and the finishing agent emulsion in the step two according to the mass ratio of 1: 8, mixing and dispersing to obtain the anti-wrinkle finishing agent for the cotton fabrics.
specifically, the number average molecular weight of the low molecular weight polycaprolactone in the first step is 700, and the hydroxyl value is 170 mgKOH/g;
In the first step, the polyether polyol is polyoxypropylene glycol;
The diisocyanate in the first step is diphenylmethane diisocyanate;
the porosity of the silicon dioxide aerogel in the second step is more than or equal to 70 percent; the grain diameter of the shape memory composite powder in the second step is less than or equal to 0.05 mm;
the finishing agent emulsion in the third step is prepared from organic silicon modified polyurethane emulsion, ethylene-vinyl acetate copolymer emulsion and silicon-containing acrylate core-shell emulsion according to the mass ratio of 1: 3: 0.6, and mixing.
A finishing process for cotton fabrics comprises soaking cotton fabrics in alkali liquor, and performing double-soaking and double-rolling with the anti-wrinkle finishing agent under pressure of 1kgf/cm2The liquid carrying rate is 70 percent, the cotton fabric is pre-dried at the temperature of 90 ℃, pre-leveled on a leveling roller, and pressed and leveled by pressing rollers at the temperature of 40 ℃ and 30 ℃ in sequence after being dried, and the finished cotton fabric is obtained.
comparative example 1
Comparative example 1 compared with example 1, the shape memory material was not supported by silica aerogel, but was directly ground and dispersed in the emulsion. Because of the lack of silica aerogel, the directly dispersed shape memory material particles can only be connected by film formation of emulsion, so that the connection firmness of the shape memory material is poor, and good memory deformation cannot be formed.
And (3) detection and test:
Cutting 3 samples of pure cotton fabric of 40 × 15mm and 1mm in thickness treated in example 1, folding, pressing at 10 deg.C under 10N pressure for 5min at 15 × 15mm area, removing pressure, standing at 10 deg.C and 35 deg.C for 5min, and observing recovery state of crease, as shown in FIG. 1, wherein a is recovery state at 10 deg.C, and the folded sample does not rebound to plane; b is the recovery condition under the environment of 35 ℃, the folded sample rebounds to be a plane, and the crease is basically eliminated;
cutting 3 samples of the pure cotton fabric of 40 × 15mm and 1mm in thickness treated in comparative example 1, folding, pressing at 10 deg.C under 10N pressure for 5min at 15 × 15mm area, removing pressure, standing at 10 deg.C and 35 deg.C for 5min, and observing the recovery condition of crease, as shown in FIG. 2, wherein c is the recovery condition at 10 deg.C, and the folded sample does not rebound to a plane; d is the recovery condition under the environment of 35 ℃, and the folding sample rebounds but is not complete.
Claims (10)
1. The preparation method of the anti-wrinkle finishing agent for the cotton fabrics is characterized by comprising the following steps:
mixing microcrystalline cellulose and low molecular weight polycaprolactone, kneading for the first time to obtain paste, adding polyether polyol, diisocyanate and a catalyst into the paste, and kneading for the second time to obtain a shape memory composite paste material;
Step two, mixing the shape memory composite paste material obtained in the step one with silicon dioxide aerogel according to the mass ratio of 2 (0.1 ~ 0.5), kneading for the third time to obtain paste, standing for at least 30min, and grinding under the condition of liquid nitrogen freezing to obtain shape memory composite powder;
and step three, mixing and dispersing the shape memory composite powder and the finishing agent emulsion in the step two according to the mass ratio of 1 (5 ~ 10) to obtain the anti-wrinkle finishing agent for the cotton fabric.
2. The method for preparing the anti-crease finishing agent for the cotton textiles, which is characterized in that the temperature of the first kneading in the first step is 50 ~ 60 ℃, and the time of the first kneading is 30 ~ 60 min;
the temperature of the second kneading in the first step is 70 ~ 80 ℃, and the time of the second kneading is 1 ~ 2 h;
The temperature of kneading for the third time in the second step is 50 ~ 60 ℃, and the kneading time is 1 ~ 2 h.
3. The method for preparing the crease-resistant finishing agent for the cotton textiles in the step one as claimed in claim 1, wherein the mass ratio of the microcrystalline cellulose to the low molecular weight polycaprolactone to the polyether polyol to the diisocyanate to the catalyst in the step one is 1 (4 ~ 5) (3 ~ 4) (2 ~ 3) (0.002 ~ 0.004.004);
in the second step, the mass ratio of the shape memory composite paste material to the silicon dioxide aerogel is 2 (0.3 ~ 0.4.4);
The mass ratio of the shape memory composite powder to the finishing agent emulsion in the third step is 1 (7 ~ 8).
4. The method for preparing the cotton fabric anti-wrinkle finishing agent according to claim 1, wherein the number average molecular weight of the low molecular weight polycaprolactone in the first step is 500 ~ 1200, and the hydroxyl value is 150 ~ 220 mgKOH/g;
in the first step, the polyether polyol is at least one of trimethylolpropane polyether, polyoxypropylene diol, polyoxypropylene triol and polytetrahydrofuran diol;
the diisocyanate in the first step is at least one of diphenylmethane diisocyanate and toluene diisocyanate;
and in the first step, the catalyst is dibutyltin laurate.
5. The method for preparing the cotton fabric anti-wrinkle finishing agent according to claim 4, wherein the number average molecular weight of the low molecular weight polycaprolactone in the first step is 500 ~ 800, the hydroxyl value is 160 ~ 200 mgKOH/g, and the polyether polyol in the first step is polyoxypropylene glycol.
6. The preparation method of the cotton fabric anti-wrinkle finishing agent according to any one of the claim 1, wherein the porosity of the silica aerogel in the second step is more than or equal to 70%; and in the second step, the particle size of the shape memory composite powder is less than or equal to 0.05 mm.
7. The method for preparing the cotton fabric anti-wrinkle finishing agent according to claim 1, wherein the finishing agent emulsion in the third step is at least one of organosilicon modified polyurethane emulsion, ethylene vinyl acetate copolymer emulsion and silicon-containing acrylate core-shell emulsion.
8. the preparation method of the crease-resistant finishing agent for the cotton fabrics, according to claim 7, is characterized in that the finishing agent emulsion in the third step is prepared by mixing organic silicon modified polyurethane emulsion, ethylene-vinyl acetate copolymer emulsion and silicon-containing acrylate core-shell emulsion according to the mass ratio of 1 (2 ~ 4) to (0.3 ~ 0.8.8).
9. an anti-wrinkle finishing agent for cotton fabrics, which is prepared by the preparation method of any one of claim 1 ~ 8.
10. A finishing process of cotton fabrics is characterized in that the cotton fabrics are soaked in alkali liquor, then the finishing agent of claim 9 is used for soaking and rolling twice, the pressure is 1-2kgf/cm2, the liquid carrying rate is 60% -80%, the finished cotton fabrics are pre-dried at 80-100 ℃, flattened by flattening rollers, dried, and sequentially flattened by pressing rollers at 40 ℃ and 30 ℃ to form a flattened initial shape at 30-40 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112341597A (en) * | 2020-10-30 | 2021-02-09 | 西安工程大学 | Preparation method of waterborne polyurethane wet rubbing fastness improver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112341597A (en) * | 2020-10-30 | 2021-02-09 | 西安工程大学 | Preparation method of waterborne polyurethane wet rubbing fastness improver |
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Application publication date: 20191217 |