A low-temperature multifunctional scouring agent and its application in a low-temperature scalding and bleaching one-bath process

Abstract

The invention discloses a low-temperature multifunctional scouring agent and its application in a low-temperature scalding and bleaching one-bath process, and relates to the technical field of textile printing and dyeing auxiliaries. Cationic surfactants and nonionic surfactants with good low-temperature scalding effects are preferably used as main components, so that the product has excellent scouring, penetration, emulsification and slurry cracking properties under low-temperature conditions, giving the fabric an excellent hair effect, compounding with a suitable amount of persulfate to exert an oxidative desizing effect, compounding with a high-molecular-weight coordinated manganese compound as an activator for low-temperature hydrogen peroxide bleaching, and improving the whiteness of low-temperature treated fabrics to the level of conventional one-scalding and one-bleaching; with a stabilizer, a maleic anhydride-acrylic acid chelating agent with excellent chelating and dispersing ability, and a small amount of an organic phosphorus dispersing chelating agent component, it is possible to control heavy metal impurities and chelate Ca in water. 2+ , Fe 3+ Mg 2+ At the same time, it can also disperse the complex evenly and stably, providing a strong guarantee for the flexibility and safety of the process.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing and dyeing technology, and specifically relates to a low-temperature multifunctional scouring agent and application thereof in a low-temperature boiling and bleaching one-bath process. Background Art

[0002] The textile printing and dyeing industry is a high-energy-consuming and high-polluting industry. As society pays more attention to environmental protection, the sustainable development of the printing and dyeing industry has attracted more and more attention. The key to the sustainable development strategy is to improve its own production technology level, which not only improves the quality and efficiency of finished product production, but also reduces the discharge of sewage.

[0003] The traditional boiling and bleaching process is used for pure cotton, polyester-cotton blended and interwoven fabrics. The process is highly safe and the treated fabrics have good wool effect, good whiteness and good desizing effect. However, the process has disadvantages such as long processing flow and high consumption of water, electricity and steam. It is not in line with the sustainable development path of environmental protection, energy conservation and emission reduction, and clean production in the printing and dyeing industry.

[0004] In order to reduce energy consumption, shorten the process and improve production efficiency, the industry has introduced energy-saving and consumption-reducing processes. For example, the cold stack + water washing process can save 2 / 3 of steam and reduce 2 / 3 of wastewater discharge compared to the boiling and bleaching process. The fabrics treated by this process can also meet the corresponding fabric processing requirements, but there is a problem of long turnover cycle. For those who have requirements for the fabric turnover cycle, the boiling and bleaching one-bath pretreatment process will be used. This process can save 1 / 2 of steam consumption compared to the boiling and bleaching process, but due to the immaturity of the process and the mismatch of auxiliaries, there are problems such as low process safety, poor effect of treating the fabric surface, and serious scaling of the steamer and guide rollers.

[0005] The conference paper (Low-temperature one-bath process for pre-treatment of polyester-cotton fabrics, Lin Changxiong, etc.) discussed the low-temperature one-bath process for pre-treatment of polyester-cotton fabrics to replace the high-temperature one-bath process for pre-treatment of polyester-cotton fabrics with scouring enzymes, because the steam used by the dyeing factory is self-produced, and the steam capacity is limited and the gas supply is insufficient, resulting in low steam box and water washing temperatures, which lead to insufficient scouring, oxygen bleaching and water washing, and to a certain extent affect the production progress and product quality. It was found that the use of low-temperature scouring and bleaching agents in the long-machine process can effectively alleviate the above production problems and reduce processing costs, especially saving water, electricity and steam. The stacking temperature of the low-temperature one-bath process for pre-treatment of polyester-cotton fabrics is only 55°C, which greatly reduces the time required for heating, and the stacking time can be further shortened on the basis of the high-temperature one-bath process for pre-treatment of polyester-cotton fabrics with scouring enzymes.

[0006] The patent (CN106192457A) discloses a one-bath dyeing and washing process for polyester-cotton scouring and bleaching pretreatment, including the following steps: 1) prepare the grey cloth, put it into the dyeing vat, add water, and keep the bath ratio at 1:10-12; 2) add surfactant, hydrogen peroxide activator, hydrogen peroxide and water into the dyeing vat in sequence at room temperature, and add caustic soda to adjust the pH; 3) heat the dyeing vat; 4) keep the dyeing vat warm; 5) add dye liquor for dyeing. The process of the present invention adopts the compound use of surfactant and hydrogen peroxide activator to make hydrogen peroxide have a higher oxidation potential at a lower caustic soda addition amount, give full play to the oxidation bleaching effect while reducing the damage to the cloth, and integrate the pretreatment scouring process with the dyeing process, which greatly simplifies the process steps, reduces labor and energy losses, and improves production efficiency.

[0007] Journal article (Low-temperature scouring and bleaching one-bath process for pure cotton fabrics, Shen Xuefeng et al., Printing and Dyeing, 2022, Issue 7) In view of the long process flow, high pollution, high energy consumption and high sewage treatment cost of conventional continuous pretreatment process for pure cotton fabrics, a new low-temperature scouring and bleaching one-bath short process pretreatment process was proposed and developed, and the effects of various auxiliaries and treatment time on the treatment effect were discussed. According to the whiteness, hair effect, strength and other indicators of the fabric, the low-temperature scouring and bleaching one-bath process was optimized. The optimized low-temperature scouring and bleaching one-bath process is: caustic soda 6g / L, hydrogen peroxide (100%) 15g / L, strong scouring agent CP-2G 10g / L, oxygen bleaching stabilizer HOC 15g / L, cracking agent HSM 2g / L, steaming conditions 80℃×45min. After treatment with the optimized low-temperature scouring and bleaching one-bath process, the fabric surface effect can be close to the level of conventional processes, while greatly reducing energy consumption and COD value, ammonia nitrogen and phosphorus content in sewage.

[0008] Patent (CN110777525A) The present invention discloses a novel high-efficiency desizing agent for chemical fiber fabrics, which is composed of the following components by weight percentage: 10-35% of cationic surfactant; 10-35% of nonionic surfactant; 1-5% of penetrant; 7-16% of desizing agent; 2-6% of chelating dispersant; 1-2.5% of antibacterial agent; 1-2.5% of pH regulator and the balance of water; and its preparation method comprises the following steps: (1) mixing the cationic surfactant, nonionic surfactant, penetrant and chelating dispersant, adding 1 / 3-1 / 2 of water, and ultrasonically dispersing to obtain solution A; (2) mixing the desizing agent and the remaining water, ultrasonically dispersing, and then adding the antibacterial agent and pH regulator, and ultrasonically dispersing to obtain solution A; (3) slowly adding solution A into solution B, stirring, and obtaining the desizing agent. The prepared desizing agent has a wide range of uses, good desizing and oil removal effects, does not damage fabrics, and has good emulsification, dispersion, penetration and refining effects.

[0009] However, the above existing technologies still fail to solve the problems of fabric applicability limitations, process insecurity, poor / instability of the one-bath boiling and bleaching process in the industry. Therefore, it is necessary to develop a low-temperature boiling and bleaching one-bath process supporting additives for various cotton fabrics such as pure cotton, polyester-cotton, nylon-cotton, and cotton-nylon. While making the fabric treatment effect reach a level similar to that of conventional one-bath boiling and bleaching, it can effectively reduce the pre-treatment temperature, save steam consumption, and improve the safety and stability of the process. Summary of the invention

[0010] The present invention aims at the problems existing in the prior art, and discloses a low-temperature multifunctional scouring agent and its application in a low-temperature scouring and bleaching one-bath process. Cationic surfactants and nonionic surfactants with good low-temperature scouring effects are preferably used as the main components of the low-temperature multifunctional scouring agent, so that the product has excellent scouring, penetration, emulsification and slurry cracking properties under low-temperature conditions, giving the fabric an excellent hair effect, compounding with a suitable amount of persulfate to exert an oxidative desizing effect, compounding with a high-molecular-weight coordinated manganese compound as an activator for low-temperature hydrogen peroxide bleaching, and improving the whiteness of low-temperature treated fabrics to the level of conventional one-boiling and one-bleaching; a stabilizer component with good stabilizing effect, a maleic anhydride-acrylic acid chelating agent with excellent chelating and dispersing ability, and a small amount of organic phosphorus dispersing chelating agent component are compounded, so that heavy metal impurities can be controlled, Ca ions in water can be chelated, and the like can be removed. 2+ , Fe 3+ Mg 2+ At the same time, the complex can be dispersed evenly and stably, providing a strong guarantee for the flexibility and safety of the process. The relationship between the specifications of the treated fabrics, the requirements for the surface treatment, the formulation of auxiliary agents, and the process conditions is determined through the system laboratory process and the actual production process, making the process more flexible, safe, and efficient.

[0011] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0012] In one aspect, the present invention provides a low-temperature multifunctional scouring agent, comprising the following raw materials in parts by weight:

[0013]

[0014] The cationic surfactant is selected from dodecylpyridinium chloride and / or hexadecyltrimethylammonium bromide, preferably a mixture of dodecylpyridinium chloride and hexadecyltrimethylammonium bromide, with a mass ratio of 2-3:1.

[0015] Among them, the nonionic surfactant is fatty alcohol polyoxyethylene ether, preferably a mixture of AEO-3, AEO-6 and AEO-9, with a mass ratio of 1:2-3:1.

[0016] Wherein, the desizing agent is a persulfate, selected from one or more of ammonium persulfate, sodium persulfate and potassium persulfate.

[0017] Wherein, the bleach activator is a high molecular weight coordinated manganese compound, preferably a manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane.

[0018] The bleaching stabilizer may be any bleaching stabilizer commonly used in the art, preferably EDTA.

[0019] Among them, the chelating agent is a mixture of maleic anhydride-acrylic acid chelating agent and an organic phosphorus chelating agent, and the mass ratio of the two is 3-5:1; preferably, the maleic anhydride-acrylic acid chelating agent is a maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, and the organic phosphorus chelating agent is selected from aminotri(methylenephosphonic acid) and / or ethylenediaminetetra(methylenephosphonic acid).

[0020] The invention selects cationic surfactants and nonionic surfactants with good low-temperature refining effects as the main components of the low-temperature multifunctional scouring agent, so that the product has excellent refining, penetration, emulsification and slurry cracking performance under low-temperature conditions, and gives the fabric an excellent hair effect; a proper amount of persulfate is compounded to exert an oxidative desizing effect; a high-molecular coordinated manganese compound is compounded as an activator for low-temperature hydrogen peroxide bleaching, and the whiteness of the low-temperature treated fabric is improved to the level of conventional one-boiling-one-bleaching; a stabilizer component with good stabilizing effect, a maleic anhydride-acrylic acid chelating agent with excellent chelating and dispersing ability, and a small amount of organic phosphorus dispersing chelating agent component are compounded, so that heavy metal impurities can be controlled, Ca ions in water can be chelated, and the like can be removed; 2+ , Fe 3+ Mg 2+ At the same time, it can also disperse the complex evenly and stably, providing a strong guarantee for the flexibility and safety of the process.

[0021] On the other hand, the present invention also provides the use of the low-temperature multifunctional scouring agent in a low-temperature scouring and bleaching one-bath process, wherein the low-temperature scouring and bleaching one-bath process is as follows: preparation of grey cloth → padding with low-temperature scouring and bleaching one-bath working solution: the liquid carrying rate is more than 80% → continuous steaming: 75-85°C, steaming for 60 minutes → continuous high-efficiency water washing → drying;

[0022] The process formula is:

[0023] NaOH (100%) 0.5-10 g L -1 ;

[0024] H2O2(100%) 0.5-10g·L -1 ;

[0025] Low temperature multifunctional scouring agent 0.1-10g·L -1 .

[0026] Through systematic laboratory processes and actual production processes, the relationships among processed fabric specifications, fabric surface treatment requirements, auxiliary agent formulations, and process conditions are determined, making the process more flexible, safe, and efficient.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The low-temperature multifunctional scouring agent of the present invention has excellent penetration performance, excellent low-temperature refining effect, and good hair effect of the treated fabric; high efficiency desizing, the desizing rate and hand feel are similar to those of one boiling and one bleaching; excellent hydrogen peroxide stability, no oxidized cellulose and holes.

[0029] 2. The low-temperature boiling and bleaching one-bath process of the present invention has excellent low-temperature boiling and bleaching treatment effect and process safety, and can reach the level of conventional boiling and bleaching. The process flow is short and the production efficiency is high; it can greatly reduce the consumption of water, electricity and steam, improve production efficiency, and effectively reduce the COD of pre-treatment wastewater, reducing wastewater treatment costs. DETAILED DESCRIPTION

[0030] It is worth noting that the raw materials used in the present invention are all common commercially available products, and their sources are not specifically limited.

[0031] The following sources of raw materials are provided for illustrative purposes:

[0032] Cationic surfactants: dodecylpyridinium chloride, hexadecyltrimethylammonium bromide, commercially available.

[0033] Nonionic surfactants: AEO-3, AEO-6, AEO-9, commercially available.

[0034] Desizing agent: ammonium persulfate, commercially available.

[0035] Bleach activator: manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane, commercially available.

[0036] Bleach stabilizer: EDTA, commercially available.

[0037] Chelating agent: maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, ethylenediaminetetrakis (methylenephosphonic acid), commercially available;

[0038] Example 1

[0039] The raw materials were weighed according to the following weight proportions: 20 parts of dodecylpyridinium chloride, 10 parts of hexadecyltrimethylammonium bromide, 5 parts of AEO-3, 10 parts of AEO-6, 5 parts of AEO-9, 8 parts of ammonium persulfate, 1 part of manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane, 1 part of EDTA, 1.5 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, 0.5 parts of ethylenediaminetetrakis(methylenephosphonic acid), and 38 parts of water to prepare a low-temperature multifunctional scouring agent.

[0040] Example 2

[0041] The raw materials were weighed according to the following weight proportions: 22.5 parts of dodecylpyridinium chloride, 7.5 parts of hexadecyltrimethylammonium bromide, 3 parts of AEO-3, 9 parts of AEO-6, 3 parts of AEO-9, 5 parts of ammonium persulfate, 3 parts of manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane, 3 parts of EDTA, 1.5 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, 0.3 parts of ethylenediaminetetrakis(methylenephosphonic acid), and 38 parts of water to prepare a low-temperature multifunctional scouring agent.

[0042] Example 3

[0043] The raw materials were weighed according to the following weight proportions: 10 parts of dodecylpyridinium chloride, 5 parts of hexadecyltrimethylammonium bromide, 6 parts of AEO-3, 18 parts of AEO-6, 6 parts of AEO-9, 12 parts of ammonium persulfate, 4 parts of manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane, 4 parts of EDTA, 1.6 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, 0.4 parts of ethylenediaminetetrakis(methylenephosphonic acid), and 38 parts of water to prepare a low-temperature multifunctional scouring agent.

[0044] Comparative Example 1

[0045] Except for 10 parts of dodecylpyridinium chloride and 20 parts of cetyltrimethylammonium bromide, the rest is the same as Example 1.

[0046] Comparative Example 2

[0047] Except for 10 parts of AEO-3, 10 parts of AEO-6 and 0 parts of AEO-9, the rest is the same as Example 1.

[0048] Comparative Example 3

[0049] Except for 15 parts of AEO-3, 0 parts of AEO-6 and 5 parts of AEO-9, the rest is the same as Example 1.

[0050] Comparative Example 4

[0051] Except for 20 parts of AEO-3, 0 parts of AEO-6 and 0 parts of AEO-9, the rest is the same as Example 1.

[0052] Comparative Example 5

[0053] Except for 2 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer and 0 parts of ethylenediaminetetrakis(methylenephosphonic acid), the rest is the same as Example 1.

[0054] Comparative Example 6

[0055] Except for 0 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer and 2 parts of ethylenediaminetetrakis(methylenephosphonic acid), the rest is the same as Example 1.

[0056] Comparative Example 7

[0057] The same procedures as in Example 1 were followed except for 2 parts of the manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane and 0 parts of EDTA.

[0058] Comparative Example 8

[0059] The same procedures as in Example 1 were followed except for 0 parts of the manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane and 2 parts of EDTA.

[0060] Comparative Example 9

[0061] The desizing agent of Example 6 of the patent (CN110777525A) is used to replace the multifunctional scouring agent of Example 1.

[0062] Application Example The multifunctional scouring agents of Examples 1-3 and Comparative Examples 1-9 are used in a low-temperature scouring and bleaching one-bath process

[0063] Experiment 1: 75℃ scouring and bleaching one bath scouring effect test

[0064] Formula: NaOH 6g / L + H2O2 (100%) 15g / L + multifunctional scouring agent Xg / L; Fabric: 20×16 / 128×60 grey cloth;

[0065] Process: dry cloth padding (liquid carrying rate 74%) → oven steaming (75℃×60min) → hot water washing (90℃×5min) → cold water washing → dehydration and drying → test the capillary effect for 30min.

[0066] Table 1: Scouring effect test results

[0067]

[0068] It can be seen from the above table that the low-temperature multifunctional scouring agents of Examples 1-3 of the present invention have an excellent effect of improving the hair effect of low-temperature scouring.

[0069] Experiment 2: 75℃ desizing effect rating test

[0070] Formula: NaOH 6g / L + H2O2 (100%) 15g / L + multifunctional scouring agent Xg / L; Fabric: 20×16 / 128×60 grey cloth;

[0071] Process: dry cloth padding (liquid carrying rate 74%) → oven steaming (75℃×60min) → hot water washing (90℃×5min) → cold water washing → dehydration and drying → test the capillary effect for 30min.

[0072] Table 2: Desizing effect rating test results

[0073]

[0074] It can be seen from the above table that the low-temperature multifunctional scouring agents of Examples 1-3 of the present invention have excellent low-temperature desizing effects.

[0075] Experiment 3: Penetration Test

[0076] Penetration test method: In 3g / L working solution (100ml), record the time it takes for the standard canvas piece to sink to the bottom of the cup from being immersed in the liquid surface.

[0077] Table 3: Penetration test results (3g / l additive)

[0078] sample Penetration / S Example 1 12.31 Example 2 10.15 Example 3 8.45 Comparative Example 1 18.12 Comparative Example 2 17.98 Comparative Example 3 17.76 Comparative Example 4 23.67 Comparative Example 5 19.04 Comparative Example 6 20.10 Comparative Example 7 18.56 Comparative Example 8 18.37 Comparative Example 9 19.99 Multifunctional Scouring Agent 18.34 Multifunctional Scouring Agent 2 25.06

[0079] It can be seen from the above table that the low-temperature multifunctional scouring agents of Examples 1-3 of the present invention have good penetration.

[0080] Experiment 4: High temperature hydrogen peroxide stability test results

[0081] Formula: NaOH4g / L+Fe 3+ 5ppm+H2O2(100%)2g / L+multi-functional scouring agentXg / L; liquid volume: 200ml; test the decomposition rate of hydrogen peroxide when the working solution is left at 90℃ for 20min.

[0082] Table 4: High temperature hydrogen peroxide stability test results

[0083]

[0084]

[0085] It can be seen from the above table that the multifunctional scouring agents of Examples 1-3 of the present invention have excellent high-temperature hydrogen peroxide stability.

[0086] Experiment 5: Fabric whiteness, hair effect, slurry feel and strength test after low-temperature scalding and bleaching in one bath

[0087] Formula: NaOH 6g / L + H2O2 (100%) 15g / L + multifunctional scouring agent 15g / L; Fabric: 40×40 / 133×72 grey cloth; Process: Dry cloth padding (liquid rate 74%) → oven steaming (75℃×60min) → hot water washing (90℃×5min) → cold water washing → dehydration and drying → testing of hair effect, whiteness, strength, sizing, and hand feel

[0088] Table 5: Whiteness, wool effect, slurry feel and strength test results of cotton fabric after low-temperature scalding and bleaching in one bath

[0089]

[0090]

[0091] As can be seen from the above table, the fabrics treated with the low-temperature multifunctional scouring agent of Examples 1-3 of the present invention in one-bath scouring and bleaching have good hair effect, more obvious whiteness improvement, better desizing performance, less fabric strength damage, and a fluffy and soft feel.

[0092] Experiment 6: COD value of washing residual liquid after continuous pretreatment of fabrics of different specifications by different processes

[0093] Conventional cold batching + water washing, conventional scouring + oxygen bleaching and low-temperature scouring and bleaching one-bath processes of [caustic soda 6g / l + hydrogen peroxide (100%) 15g / l + low-temperature multifunctional scouring agent 15g / l of Example 1, steaming conditions of 80℃×45min] were used to pre-treat all cotton woven grey fabrics of different specifications. After treatment, the fabrics were washed with hot water at 90℃ for 5min at a bath ratio of 1:5, and the COD value of the washing residue was tested.

[0094] Table 6: COD test results of washing residual liquid after continuous pretreatment of fabrics of different specifications by different processes

[0095]

[0096] As can be seen from the above table, the residual liquid COD value, ammonia nitrogen and phosphorus content of the low-temperature boiling and bleaching one-bath process are significantly lower, which can greatly reduce the pressure of sewage treatment and achieve the goal of environmental protection and emission reduction.

[0097] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A low-temperature multifunctional scouring agent, characterized in that: It is composed of the following raw materials in parts by weight: 10-30 parts of cationic surfactant; 10-30 parts of nonionic surfactant; 5-15 parts of desizing agent; 0.5-5 parts of bleach activator; 0.5-5 parts of bleaching stabilizer; 1-10 parts of chelating agent; 30-70 parts water; The cationic surfactant is dodecylpyridinium chloride and cetyltrimethylammonium bromide in a mass ratio of 2-3:1; The nonionic surfactant is a mixture of AEO-3, AEO-6, and AEO-9, and the mass ratio of AEO-3, AEO-6, and AEO-9 is 1:2-3:1; The chelating agent is a mixture of a maleic anhydride-acrylic acid chelating agent and an organophosphorus chelating agent, with a mass ratio of 3-5:1; The desizing agent is persulfate; The bleach activator is a high molecular weight coordinated manganese compound; The bleaching stabilizer is EDTA.

2. The low-temperature multifunctional scouring agent according to claim 1, characterized in that The persulfate is selected from one or more of ammonium persulfate, sodium persulfate and potassium persulfate.

3. The low-temperature multifunctional scouring agent according to claim 1, characterized in that The bleach activator is a manganese complex of 1,2-bis(4,7-dimethyl-1,4,7-triazacyclononane-1)ethane.

4. The low-temperature multifunctional scouring agent according to claim 1, characterized in that The maleic anhydride-acrylic acid chelating agent is maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, and the organic phosphorus chelating agent is selected from aminotri(methylenephosphonic acid) and / or ethylenediaminetetra(methylenephosphonic acid).

5. Use of the low-temperature multifunctional scouring agent according to any one of claims 1 to 4 in a low-temperature scouring-bleaching-one-bath process, characterized in that: The low-temperature scouring and bleaching one-bath process is as follows: dry cloth padding: liquid rate 74% → oven steaming: 75°C, steaming for 60 minutes → hot water washing: 90°C, 5 minutes → cold water washing → dehydration and drying; The process formula is: NaOH 6 g·L -1 4 100%H2O2 15g·L -1 ; Low temperature multifunctional scouring agent 5g·L -1 , 7.5g·L -1 、10g·L -1 or 15 g·L -1 .

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