CN111793969A - Light bleaching method of composite non-woven fabric - Google Patents
Light bleaching method of composite non-woven fabric Download PDFInfo
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- CN111793969A CN111793969A CN202010695939.XA CN202010695939A CN111793969A CN 111793969 A CN111793969 A CN 111793969A CN 202010695939 A CN202010695939 A CN 202010695939A CN 111793969 A CN111793969 A CN 111793969A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
- D06L4/13—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using inorganic agents
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
- D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
- D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
- D06L1/16—Multi-step processes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
- D06L4/12—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen combined with specific additives
Abstract
A light bleaching method of composite non-woven fabric comprises the following steps: adding a bleaching solution into a bleaching pot, soaking the composite non-woven fabric in the bleaching solution for bleaching, wherein the bleaching solution comprises softened water, liquid caustic soda and hydrogen peroxide, the concentration of the hydrogen peroxide is 12.5-25%, the bleaching temperature is 75-85 ℃, and the bleaching step time is 10-60 s. The concentration and the treatment time of the hydrogen peroxide are reduced, so that the bleaching effect on the composite non-woven fabric is achieved, the damage to the fibers of the composite non-woven fabric is reduced, the soft hand feeling of the fibers is kept, and the skin-friendly hydrophilicity of the whole composite non-woven fabric is improved, thereby achieving multiple purposes. The lower boiling and bleaching temperature reduces the damage to the non-woven fabric fiber and also can weaken the ineffective decomposition of hydrogen peroxide. Compared with the conventional bleaching method, the light bleaching method for the composite non-woven fabric is shorter in treatment time, lower in boiling and bleaching temperature, and capable of reducing energy consumption while improving efficiency.
Description
Technical Field
The invention relates to the technical field of non-woven fabrics, in particular to a light bleaching method of a composite non-woven fabric.
Background
The non-woven fabric after being compounded is subjected to high-pressure spunlace compounding, so that impurities in the cotton material can be taken away by high-pressure spunlace flow, water circulation is recycled, and the circulating water contains impurities such as cotton seeds and fiber seed crumbs carried by cotton fibers.
If the compounded non-woven fabric is not subjected to any treatment, the prepared compound non-woven fabric has dirty cloth surface, defects and uneven distribution of the defects, and a large amount of manpower and material resources are consumed in the subsequent link of inspecting and picking the defects. Moreover, the property stability is not good, resulting in non-uniform hydrophilic and water-repellent distributions.
Based on the problems of the non-treated compounded non-woven fabric, the method for bleaching the compounded non-woven fabric is provided, so that the problems of the non-treated compounded non-woven fabric can be effectively relieved, but in actual operation, the provided bleaching process can solve the problems of dirty cloth surface and uneven distribution of defects of the non-treated compounded non-woven fabric, but has negative effects. Therefore, further research is required for the treatment process of the non-woven fabric after the compounding.
Disclosure of Invention
The invention provides a light bleaching method of a composite non-woven fabric, and aims to further perfect a treatment process of the composite non-woven fabric.
The application provides a light bleaching method of composite non-woven fabric in an embodiment, and the light bleaching method comprises the following steps: adding a bleaching solution into a bleaching pot, soaking the composite non-woven fabric in the bleaching solution for bleaching, wherein the bleaching solution comprises softened water, liquid caustic soda and hydrogen peroxide, the concentration of the hydrogen peroxide is 12.5-25%, the bleaching temperature is 75-85 ℃, and the bleaching step time is 10-60 s.
In one embodiment, the method further comprises:
a hot washing step: soaking the composite non-woven fabric subjected to the boiling and bleaching step in heated softened water, and hot washing for 10-20 s, wherein the temperature of the softened water is 55-65 ℃;
and (3) water washing: and soaking the composite non-woven fabric subjected to the hot washing step in softened water at normal temperature for water washing, and adding dilute acid into the softened water for neutralization, wherein the dilute acid accounts for 1-2% of the composite non-woven fabric by mass.
In one embodiment, a refining agent, an oxygen bleaching stabilizer and an oxygen bleaching promoter are added into the bleaching solution in the bleaching step.
In one embodiment, the refining agent is an anionic surfactant complex, the oxygen bleaching stabilizer is sodium silicate, and the oxygen bleaching promoter is a mixture of a surfactant, bentonite, an oxide of an alkali metal element, an organic base, and a peroxygen substance.
In one embodiment, the refining agent, the oxygen bleaching stabilizer and the oxygen bleaching accelerant added in the boiling and bleaching step respectively account for 2% -5%, 4% -10% and 2% -5% of the composite non-woven fabric in percentage by mass in sequence.
In one embodiment, the caustic soda concentration of the bleaching liquor is 10% -35%.
In one embodiment, the water washing step is performed by adding dilute sulfuric acid or dilute acetic acid to the softened water for neutralization.
In one embodiment, the composite nonwoven fabric comprises a first layer of nonwoven fabric and a second layer of nonwoven fabric, both of which are selected from cotton materials.
In one embodiment, the first layer of non-woven fabric is made of hydrophilic cotton material or water repellent cotton material; and/or the second layer of non-woven fabric is made of hydrophilic cotton material or water repellent cotton material.
In one embodiment, the cotton material is selected from at least one of an all cotton spunlace nonwoven, a degreased and bleached lap, an ungreased and unbleached lap, and a bleached and unbleached lap.
According to the light bleaching method of the composite non-woven fabric, the determined hydrogen peroxide concentration, the determined reaction temperature and the determined treatment time achieve the bleaching effect on the composite non-woven fabric, the oxidation effect of the hydrogen peroxide on fibers in the reaction process and other ineffective decomposition degrees are weakened to the greatest extent, the damage to the fibers of the composite non-woven fabric is reduced, the soft hand feeling of the fibers is kept, and the skin-friendly hydrophilicity of the whole composite non-woven fabric is improved.
Compared with the conventional bleaching method, the light bleaching method for the composite non-woven fabric can achieve the bleaching effect on the composite non-woven fabric, can reduce the damage to fibers of the composite non-woven fabric, is better, and can reduce energy consumption while improving efficiency due to the fact that the concentration of hydrogen peroxide, the reaction temperature and the treatment time are reduced.
Drawings
FIG. 1 is a flow chart illustrating a process for preparing a composite nonwoven fabric according to an embodiment of the present disclosure;
fig. 2 is a flow chart of a light bleaching method in an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the prior art, the compounded non-woven fabric usually adopts a conventional bleaching process (can be bleached, and can be used for treating cotton seeds, fiber seeds and the like). In the conventional bleaching method of the composite non-woven fabric, the skilled person generally considers that the higher the concentration of hydrogen peroxide in a certain range and the longer the time, the better the final bleaching effect is. Therefore, in the conventional bleaching method, the concentration of the generally used hydrogen peroxide is 30-50%, the time is 15-60 min, and the temperature is 100 ℃.
However, since the hydrogen peroxide concentration is high and the treatment time is long, the damage to the cotton fiber is large, which is mainly reflected in the influence of the fiber strength and the peeling force of the composite nonwoven fabric. And the conventional bleaching process is low in time consumption and long-term effect.
The application further researches the post-treatment process of the composite non-woven fabric, and finds that the adoption of hydrogen peroxide is really helpful for solving the problems of dirty cloth surface and uneven distribution of defects of the composite non-woven fabric. However, the concentration of the hydrogen peroxide used, the reaction temperature, and the treatment time of the composite nonwoven fabric can be studied again, and the difference between the concentration of the hydrogen peroxide, the reaction temperature, and the treatment time is relatively small in the treatment of the composite nonwoven fabric with dirty cloth surface and uneven distribution of defects, but has different degrees of influence on other aspects, such as damage to fibers of the composite nonwoven fabric, fiber strength, peeling force, and the like. The influences of the hydrogen peroxide concentration, the reaction temperature and the treatment time on the composite non-woven fabric are mutually related.
The research of the application finds that the treatment effect of the conventional bleaching process can be achieved by firstly reducing the concentration of hydrogen peroxide, which is different from the conventional cognition of the technical personnel in the field, and the effect is better because the concentration of the hydrogen peroxide is not higher. The decomposition rate of hydrogen peroxide increases with the increase in temperature, but it cannot be said whether bleaching is effectively performed only from the rate of hydrogen peroxide decomposition. Because of the side reactions such as the oxidation of the fiber by the hydrogen peroxide and other ineffective decompositions. On the premise that the concentration of hydrogen peroxide and the reaction temperature are proper, the setting of the reaction time needs to be further determined.
Regarding the reaction time, firstly, the reaction cannot be carried out in time, the problems of dirty cloth surface and uneven distribution of defects of the composite non-woven fabric are not solved completely, but the reaction time cannot be too long, and the degree of side reactions such as oxidation of fibers and other ineffective decomposition of hydrogen peroxide can be increased after too long time. Secondly, due to the technical prejudice of the skilled person, it is generally believed that reducing the concentration of hydrogen peroxide can achieve the treatment effect of the conventional bleaching process, but the reaction time should be longer. In fact, the inventors have found through studies that the reaction time of hydrogen peroxide is shorter than before and the effect is better when the hydrogen peroxide concentration is reduced. In a shorter time, the effective bleaching proportion is more, and side reactions such as ineffective decomposition and the like are less. However, if the time is prolonged, side reactions such as ineffective decomposition mainly occur for a long time. Therefore, the reaction time is not as good as the reaction time is longer at a low concentration.
Based on the research, the light bleaching method of the composite non-woven fabric, provided by the application, has the advantages that the determined hydrogen peroxide concentration, the determined reaction temperature and the determined treatment time achieve the bleaching effect on the composite non-woven fabric, the oxidation effect of the hydrogen peroxide on fibers in the reaction process and the degrees of other ineffective decomposition are weakened to the greatest extent, the damage to the fibers of the composite non-woven fabric is reduced, the soft hand feeling of the fibers is kept, and meanwhile, the skin-friendly hydrophilicity of the whole composite non-woven fabric is improved, so that the method achieves multiple purposes.
Specifically, in this embodiment, a method for gently bleaching a composite nonwoven fabric includes a boiling and bleaching step: adding a bleaching solution into a bleaching pot, soaking the composite non-woven fabric in the bleaching solution for bleaching, wherein the bleaching solution comprises softened water, liquid alkali and hydrogen peroxide, the concentration of the hydrogen peroxide is 12.5-25% (the concentration of the hydrogen peroxide comprises 12.5% and 25% of the end value of the given parameter range, the range values of all parameters in the application comprise the end value of the given range, and the subsequent description is omitted), the bleaching temperature is 75-85 ℃, and the bleaching step time is 10-60 s.
Compared with the conventional bleaching method, the light bleaching method for the composite non-woven fabric can achieve the bleaching effect on the composite non-woven fabric, can reduce the damage to fibers of the composite non-woven fabric, is better, and can reduce energy consumption while improving efficiency due to the fact that the concentration of hydrogen peroxide, the reaction temperature and the treatment time are reduced.
Preferably, in an embodiment, the boiling and bleaching step further includes:
a hot washing step: heating the softened water to 55-65 ℃, soaking the composite non-woven fabric subjected to the boiling and bleaching step in the heated softened water, and washing with hot water for 10-20 s;
and (3) water washing: and (3) soaking the composite non-woven fabric subjected to the hot washing step in softened water at normal temperature for water washing, and adding dilute acid into the softened water for neutralization, wherein the dilute acid accounts for 1-2% of the composite non-woven fabric by mass.
In the hot washing step, the boiling bleaching liquid in the bleaching pot can be directly removed, softened water is injected, and thus the hot washing device is formed. Of course, in other embodiments, a container containing softened water may be separately provided as the hot washing device.
Similarly, in the washing step, the boiling bleaching liquid in the bleaching pot or the softened water in the hot washing device can be directly removed, and the softened water at normal temperature is injected, so that the washing device is formed. Of course, in other embodiments, a container containing softened water at normal temperature may be separately provided as the water washing device.
And in the hot washing step and the water washing step, alkaline substances left on the composite non-woven fabric in the boiling and bleaching step are further diluted, and new softened water is adopted in each step, so that impurities on the composite non-woven fabric can be more fully removed. The dilute acid can neutralize alkaline matters on the non-woven fabric, and can remove metallic matters absorbed by the non-woven fabric from a liquid alkaline solution and spots caused by some reasons.
Preferably, in one embodiment, a refining agent, an oxygen bleaching stabilizer and an oxygen bleaching promoter are added into the scouring and bleaching liquid in the scouring and bleaching step.
Specifically, in one embodiment, the refining agent is an anionic surfactant complex, the oxygen bleaching stabilizer is sodium silicate, and the oxygen bleaching promoter is a mixture of a surfactant, bentonite, an oxide of an alkali metal element, an organic base and a peroxy substance. In one embodiment, the refining agent, the oxygen bleaching stabilizer and the oxygen bleaching accelerant added in the scouring and bleaching process respectively account for 2% -5%, 4% -10% and 2% -5% of the composite non-woven fabric in percentage by mass.
The light bleaching method of the composite non-woven fabric has the advantages that the influence of temperature, time and hydrogen peroxide concentration on the bleaching effect is correlated. The decomposition rate of the hydrogen peroxide is increased along with the increase of the temperature, and whether the bleaching is effectively carried out cannot be indicated only from the decomposition speed of the hydrogen peroxide because the hydrogen peroxide has side reactions such as oxidation of fibers and other ineffective decomposition. But under the action of the refining agent, the oxygen bleaching stabilizer and the oxygen bleaching accelerant, the temperature rise can accelerate the effective decomposition of hydrogen peroxide, improve the oxidation reaction speed of the pigment and other impurities, shorten the bleaching treatment time and greatly improve the light bleaching efficiency.
In one embodiment, the caustic soda concentration of the bleaching liquor is 10% -35%.
Preferably, in one embodiment, the hot washing temperature is 60 ℃, the hot washing step is more effective, and the water washing step is performed by adding dilute sulfuric acid or dilute acetic acid to the softened water for neutralization.
In one embodiment, the composite nonwoven fabric includes a first layer of nonwoven fabric and a second layer of nonwoven fabric, both of which are selected from cotton materials. The non-woven fabric compounded by the cotton material has better skin-friendly property and wider market popularization.
Preferably, in one embodiment, the first layer of non-woven fabric is made of hydrophilic cotton material or water repellent cotton material; and/or the second layer of non-woven fabric is made of hydrophilic cotton material or water repellent cotton material. The hydrophilic cotton material and the water repellent cotton material are compounded to obtain a pure cotton one-way diversion material, the hydrophilic cotton material and the hydrophilic cotton material are compounded to obtain a two-sided hydrophilic material, and the water repellent cotton material are compounded to obtain a single-sided weak water repellent material. Preferably, in some embodiments, the hydrophilic cotton material is selected from a hydrophilic all-cotton spunlace nonwoven fabric, the water-repellent cotton material is selected from a water-repellent all-cotton spunlace nonwoven fabric, and if the hydrophilic all-cotton spunlace nonwoven fabric and the water-repellent all-cotton spunlace nonwoven fabric are both subjected to degreasing bleaching treatment, the time of subsequent light bleaching treatment of the obtained composite nonwoven fabric is shorter.
Preferably, in one embodiment, the cotton material is selected from at least one of a spun lace nonwoven, a bleached and degreased cotton roll, an unbleached and unbleached cotton roll, and a bleached and ungreased cotton roll.
Further, in one embodiment, the composite non-woven fabric after the light bleaching treatment is soaked and bundled in finishing liquid containing quaternary ammonium salt antibacterial agent, the soaking and bundling liquid rate is 0.9-1.2, and then the composite non-woven fabric is dried and rolled to obtain the antibacterial composite non-woven fabric.
The following is a further description of a more specific embodiment.
Example 1
The light bleaching treatment method of the composite non-woven fabric comprises the following steps:
step S1, preliminary preparation: and (3) unwinding the hydrophilic all-cotton spunlace non-woven fabric and the water-repellent all-cotton spunlace non-woven fabric, and compounding the unwound hydrophilic all-cotton spunlace non-woven fabric and the water-repellent all-cotton spunlace non-woven fabric through high-pressure spunlace to obtain the composite non-woven fabric.
Step S2, boiling and bleaching step: adding a bleaching solution into a bleaching pot, soaking the composite non-woven fabric in the bleaching solution for bleaching, wherein the bleaching solution comprises softened water, liquid alkali and hydrogen peroxide, the concentration of the hydrogen peroxide is 17.5%, the concentration of the liquid alkali is 25%, the bleaching temperature is 80 ℃, and the bleaching step time is 45 s. 3 percent of refining agent, 8 percent of oxygen bleaching stabilizer and 3 percent of oxygen bleaching accelerant which respectively account for the composite non-woven fabric are added into the boiling and bleaching liquid in sequence. Wherein the refining agent is a complex of anionic surfactants, the oxygen bleaching stabilizer is sodium silicate, and the oxygen bleaching promoter is a mixture of a surfactant, bentonite, an oxide of an alkali metal element, an organic base and a peroxy substance.
Step S3, removing the boiling and bleaching liquid in the bleaching pot, injecting softened water, heating the softened water to 60 ℃, soaking the composite non-woven fabric subjected to the boiling and bleaching step in the heated softened water, and performing hot washing for 15S;
step S4, water washing step: and after the hot washing step, removing softened water in the bleaching pot, adding normal-temperature softened water, soaking the composite non-woven fabric subjected to the hot washing step in the softened water for normal-temperature washing, and adding dilute acetic acid into the softened water for neutralization, wherein the dilute acetic acid accounts for 1.5% of the composite non-woven fabric by mass.
Comparative example 1
Step S1, preliminary preparation: and (3) unwinding the hydrophilic all-cotton spunlace non-woven fabric and the water-repellent all-cotton spunlace non-woven fabric, and compounding the unwound hydrophilic all-cotton spunlace non-woven fabric and the water-repellent all-cotton spunlace non-woven fabric through high-pressure spunlace to obtain the composite non-woven fabric.
Step S2, bleaching step: and adding a bleaching solution into the bleaching pot, soaking the composite non-woven fabric in the bleaching solution for bleaching, wherein the bleaching solution comprises softened water, liquid alkali and hydrogen peroxide, the concentration of the hydrogen peroxide is 30%, the concentration of the liquid alkali is 25%, the boiling and bleaching temperature is 100 ℃, and the boiling and bleaching step time is 30 min.
The nonwoven composite fabrics prepared in the previous stage of example 1 and comparative example 1 were 40g/m2The composite nonwoven fabrics obtained in example 1 and comparative example 1 were subjected to the relevant performance tests, as shown in the following table:
under the condition of high temperature and alkalinity, the bleaching of cotton fibers by hydrogen peroxide is a very complex reaction process, the hydrogen peroxide has a destructive effect on cellulose and also has damage to the cellulose, wherein hydroxyl on the cellulose is oxidized, and the oxygen decomposed by the hydrogen peroxide can cause severe degradation effect on the cellulose. Therefore, the light bleaching method has less damage to cotton fibers or cotton cloth under the effect of meeting the bleaching. Compared with bleaching, the light bleaching has smaller damage to the fibers, and as shown in the table above, the light bleaching method has less influence on the dry fracture strength and the wet fracture strength of the composite non-woven fabric than the bleaching process.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. The light bleaching method of the composite non-woven fabric is characterized by comprising the following boiling and bleaching steps: adding a bleaching solution into a bleaching pot, soaking the composite non-woven fabric in the bleaching solution for bleaching, wherein the bleaching solution comprises softened water, liquid caustic soda and hydrogen peroxide, the concentration of the hydrogen peroxide is 12.5-25%, the bleaching temperature is 75-85 ℃, and the bleaching step time is 10-60 s.
2. The light bleaching method according to claim 1, further comprising:
a hot washing step: soaking the composite non-woven fabric subjected to the boiling and bleaching step in heated softened water, and hot washing for 10-20 s, wherein the temperature of the softened water is 55-65 ℃;
and (3) water washing: and soaking the composite non-woven fabric subjected to the hot washing step in softened water at normal temperature for water washing, and adding dilute acid into the softened water for neutralization, wherein the dilute acid accounts for 1-2% of the composite non-woven fabric by mass.
3. The light bleaching method according to claim 1, characterized in that a refining agent, an oxygen bleaching stabilizer and an oxygen bleaching promoter are added into the bleaching solution in the scouring and bleaching step.
4. The light bleaching process according to claim 3, wherein the refining agent is an anionic surfactant complex, the oxygen bleaching stabilizer is sodium silicate, and the oxygen bleaching promoter is a mixture of a surfactant, bentonite, an oxide of an alkali metal element, an organic base, and a peroxygen substance.
5. The light bleaching method according to claim 4, wherein the refining agent, the oxygen bleaching stabilizer and the oxygen bleaching promoter added in the boiling and bleaching step respectively account for 2% -5%, 4% -10% and 2% -5% of the composite non-woven fabric in sequence by mass.
6. The light bleaching method according to claim 1, characterized in that the caustic soda lye concentration of the bleaching liquor is 10% -35%.
7. A light bleaching process according to claim 2, wherein the water washing step is carried out by adding dilute sulphuric acid or dilute acetic acid to the demineralised water for neutralisation.
8. A light bleaching method according to any one of claims 1 to 7, characterized in that the composite nonwoven comprises a first layer of nonwoven and a second layer of nonwoven, both of which are selected from cotton material.
9. The light bleaching method according to claim 8, characterized in that the first layer of non-woven fabric is selected from hydrophilic cotton materials or water repellent cotton materials; and/or the second layer of non-woven fabric is made of hydrophilic cotton material or water repellent cotton material.
10. The light bleaching method according to claim 8, wherein the cotton material is selected from at least one of a whole cotton spunlace nonwoven, a degreased bleached cotton roll, a non-degreased unbleached cotton roll and a bleached non-degreased cotton roll.
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| CN112746388A (en) * | 2020-12-28 | 2021-05-04 | 应城市天润产业用布有限责任公司 | Processing method of spunlace non-woven fabric |
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| CN112746388A (en) * | 2020-12-28 | 2021-05-04 | 应城市天润产业用布有限责任公司 | Processing method of spunlace non-woven fabric |
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