Active anti-staining soaping agent for cotton as well as preparation method and application of active anti-staining soaping agent

Abstract

The invention relates to an active anti-staining soaping agent for cotton as well as a preparation method and application thereof. The active anti-staining soaping agent for cotton is prepared from polyaspartic acid, fatty amine polyoxyethylene ether 1815, fatty alcohol-polyoxyethylene ether AEO-9, a nonionic surfactant, lauryl sodium sulfate, polyvinylpyrrolidone and pure water. The preparation method comprises the following steps: heating pure water to 60-80 DEG C, adding fatty amine polyoxyethylene ether 1815 and lauryl sodium sulfate, stirring, adding polyvinylpyrrolidone, stirring again, cooling to 50-60 DEG C, adding polyaspartic acid, stirring, adding fatty alcohol polyoxyethylene ether AEO-9 and a nonionic surfactant, and uniformly stirring to obtain the product. The active anti-staining soaping agent for cotton has excellent emulsifying and dispersing capacity, can effectively clean oil stains and fat stains, wash out flooding and hydrolytic dyes, and can effectively prevent the soaping agent from staining on fabrics, so that the color fastness and the color brightness of the fabrics are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical additives, and in particular relates to an active anti-staining soaping agent for cotton and a preparation method and application thereof. Background Art

[0002] Reactive dyes are currently the most commonly used method for dyeing cotton and its blended fabrics. During the dyeing process, the dye forms a relatively tight covalent bond with the fiber, thereby achieving dyeing. However, some dyes still fail to fully bind to the fiber, forming floating colors or unbonded hydrolyzed dyes. Floating colors and hydrolyzed dyes are the main factors affecting color fastness, causing problems such as bleeding, white staining, re-staining, and poor wet fastness and washing fastness. Floating colors and hydrolyzed dyes are generally removed by soaping.

[0003] Floating colors on the fiber surface and dyes mixed between fibers due to capillary network effects can be easily removed by water exchange and dilution during soap washing. However, hydrolyzed dyes have their own particularity. They not only exist on the fiber surface, but more in the internal pores of the fiber. Soap washing mainly utilizes the emulsification, chelating and dispersing ability of the soaping agent to decompose, adsorb and disperse them, and then remove them by dilution and exchange with water.

[0004] The more popular active soap detergent on the market is MA / AA copolymer. Depending on the ratio of MA and AA, the weight average molecular weight of MA / AA copolymer ranges from 10,000 to 80,000. MA / AA copolymer has excellent dispersibility. It can disperse tiny particles in liquid and enhance the dispersibility of detergent. This property enables MA / AA copolymer to effectively disperse stains during the cleaning process and improve the cleaning effect. Secondly, MA / AA copolymer has an emulsifying effect and can mix oily substances with water to form a stable emulsion, making it easier to clean oil and fat stains. In addition, MA / AA copolymer has a chelating effect and dust suppression effect on water quality, which can soften water quality, inhibit the adverse effects of metal ions, increase the viscosity of the detergent and inhibit dust scattering, further improving the cleaning effect and stability.

[0005] Even though maltodextrin copolymer has many advantages as a conventional soaping agent, its performance in single color dyeing soaping is acceptable, but its anti-staining effect is poor when mixing light and dark colors, and it is very easy to cause staining and affect color fastness. Especially in the reactive printing process, white background anti-staining is the main factor to consider the comprehensive performance of the soaping agent.

[0006] In addition, with the improvement of ecological textile regulations and environmental protection requirements, especially in the printing and dyeing process, a large amount of water is used, and sewage treatment has become an important part of the cost calculation. It is urgent to develop an anti-staining soap detergent that can achieve good anti-staining effect, save water, reduce the number of washing times, and has low cost. Summary of the invention

[0007] The purpose of the present invention is to solve the problems raised in the above background problems and provide an active anti-staining soaping agent for cotton, which has excellent emulsifying and dispersing ability, can effectively clean oil and fat stains, wash out floating colors, hydrolyze dyes, and reduce the acid washing process after conventional soaping, reduce the cost of sewage treatment, and effectively prevent it from being stained back on the fabric, thereby improving its color fastness and color brightness.

[0008] The technical solution adopted by the present invention to solve the above problem is: an active anti-staining soaping agent for cotton, comprising the following raw materials in parts by weight: Polyaspartic acid 30-35 parts Fatty amine polyoxyethylene ether 1815 3-5 parts Fatty alcohol polyoxyethylene ether AEO-9 3-5 parts 1-5 parts of nonionic surfactant 2-5 parts of sodium lauryl sulfate Polyvinyl pyrrolidone 5-8 parts 39-55 parts of pure water Preferably, the polyaspartic acid is sodium polyaspartate PASP produced by Shandong Yuanlian Chemical Co., Ltd. In daily industrial applications, polyaspartic acid is widely used as a scale inhibitor in combination with other sewage treatment agents, but its structure is a polymerized amino acid with a carboxylic acid side chain, which has good biodegradability, and the final degradation products are ammonia, carbon dioxide and water that are harmless to the environment. It has a strong chelating ability for polyvalent metal ions such as calcium, magnesium, copper, and iron, and has a cleaning ability that is superior to polycarboxylates, and has strong dispersing power, which meets the requirements of a new type of environmentally friendly cotton anti-staining soap detergent.

[0009] Preferably, the nonionic surfactant is a low-foaming nonionic surfactant S-40, a product of Shanghai Xinze Chemical Co., Ltd. Preferably, the polyvinyl pyrrolidone is polyvinyl pyrrolidone PVP-K30, a product of Shanghai Kenji Chemical Co., Ltd.

[0010] Another object of the present invention is to provide a method for preparing an active anti-staining soaping agent for cotton, comprising the following steps: (1) Heat pure water to 60-80°C, add fatty amine polyoxyethylene ether 1815 and sodium lauryl sulfate, stir for 20-30 minutes, add polyvinyl pyrrolidone, and stir for 20-30 minutes; (2) Cool to 50-60°C, add polyaspartic acid, and stir for 30-50 minutes; (3) Add fatty alcohol polyoxyethylene ether AEO-9 and nonionic surfactant, and stir for 30-40 minutes to obtain the product.

[0011] Another object of the present invention is to provide an application of an active anti-staining soaping agent for cotton, wherein the active anti-staining soaping agent for cotton is used to soap pure cotton reactive dyed fabrics.

[0012] Compared with the prior art, the advantages of the present invention are: The active anti-staining soaping agent for cotton prepared by the present invention does not contain phosphorus, APEO and formaldehyde, is easily degradable, and is a green and environmentally friendly product. The soaping agent itself is weakly acidic, which reduces the conventional post-soaping acid washing process and reduces the sewage treatment cost. In addition, polyaspartic acid is added to the soaping agent. This component has good dispersing and complexing ability, can effectively remove unfixed dyes and hydrolyzed dyes, and has good emulsifying effect. It can mix oil substances with water to form a stable emulsion, so that oil and fat stains are easier to clean. Fatty amine polyoxyethylene ether 1815 and polyvinyl pyrrolidone are also added as anti-staining raw materials for the soaping agent, wherein the fatty amine polyoxyethylene ether 1815 is cationic under weak acid conditions and can react with hydrolyzed dyes to avoid staining. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the embodiments.

[0014] The polyaspartic acid is sodium polyaspartate PASP produced by Shandong Yuanlian Chemical Industry Co., Ltd.

[0015] Low foaming nonionic surfactant S-40 is a product of Shanghai Xinze Chemical Co., Ltd. Polyvinyl pyrrolidone is polyvinyl pyrrolidone PVP-K30, which is a product of Shanghai Kenji Chemical Co., Ltd. Example 1

[0016] An active anti-staining soaping agent for cotton, comprising the following components in parts by weight: 30 parts of polyaspartic acid, 5 parts of fatty amine polyoxyethylene ether 1815, 3 parts of fatty alcohol polyoxyethylene ether AEO-9, 3 parts of low-foaming nonionic surfactant S-40, 2 parts of sodium lauryl sulfate, 8 parts of polyvinyl pyrrolidone PVP-K30, and 44 parts of pure water.

[0017] The preparation method of the active anti-staining soaping agent for cotton comprises the following steps: (1) Heat pure water to 80°C, add fatty amine polyoxyethylene ether 1815 and sodium lauryl sulfate, stir for 30 minutes, add polyvinyl pyrrolidone PVP-K30, and stir for 30 minutes; (2) Cool to 50°C, add polyaspartic acid, and stir for 30 minutes; (3) Add fatty alcohol polyoxyethylene ether AEO-9 and low-foaming nonionic surfactant S-40, and stir for another 40 minutes to obtain the product. Example 2

[0018] An active anti-staining soaping agent for cotton, comprising the following components in parts by weight: 35 parts of polyaspartic acid, 5 parts of fatty amine polyoxyethylene ether 1815, 3 parts of fatty alcohol polyoxyethylene ether AEO-9, 3 parts of low-foaming nonionic surfactant S-40, 2 parts of sodium lauryl sulfate, 6 parts of polyvinyl pyrrolidone PVP-K30, and 46 parts of pure water.

[0019] The preparation method of the active anti-staining soaping agent for cotton comprises the following steps: (1) Heat pure water to 80°C, add fatty amine polyoxyethylene ether 1815 and sodium lauryl sulfate, heat and stir for 30 minutes, add polyvinyl pyrrolidone PVP-K30, and stir for 30 minutes; (2) Cool to 50°C, add polyaspartic acid, and stir for 30 minutes; (3) Add fatty alcohol polyoxyethylene ether AEO-9 and low-foaming nonionic surfactant S-40, and stir for another 40 minutes to obtain the product. Example 3

[0020] An active anti-staining soaping agent for cotton, comprising the following components in parts by weight: 30 parts of polyaspartic acid, 3 parts of fatty amine polyoxyethylene ether 1815, 5 parts of fatty alcohol polyoxyethylene ether AEO-9, 5 parts of low-foaming nonionic surfactant S-40, 4 parts of sodium lauryl sulfate, 6 parts of polyvinyl pyrrolidone PVP-K30, and 47 parts of pure water.

[0021] The preparation method of the active anti-staining soaping agent for cotton comprises the following steps: (1) Heat pure water to 80°C, add fatty amine polyoxyethylene ether 1815 and sodium lauryl sulfate, heat and stir for 20 minutes, add polyvinyl pyrrolidone PVP-K30, and stir for 20 minutes; (2) Cool to 50°C, add polyaspartic acid, and stir for 30 minutes; (3) Add fatty alcohol polyoxyethylene ether AEO-9 and low-foaming nonionic surfactant S-40, and stir for another 30 minutes to obtain the product.

[0022] Comparative Example 1 An active anti-staining soaping agent for cotton, comprising the following components in parts by weight: 30 parts of polyaspartic acid, 5 parts of fatty amine polyoxyethylene ether 1815, 3 parts of fatty alcohol polyoxyethylene ether AEO-9, 3 parts of low-foaming nonionic surfactant S-40, 2 parts of sodium lauryl sulfate, and 52 parts of pure water.

[0023] The preparation method of the active anti-staining soaping agent for cotton comprises the following steps: (1) Heat pure water to 80°C, add fatty amine polyoxyethylene ether 1815 and sodium lauryl sulfate, and stir for 30 minutes; (2) Cool to 50°C, add polyaspartic acid, and stir for 30 minutes; (3) Add fatty alcohol polyoxyethylene ether AEO-9 and low-foaming nonionic surfactant S-40, and stir for another 40 minutes to obtain the product.

[0024] Comparative Example 2 A common anti-stain soaping agent on the market was used as a comparative example. The common anti-stain soaping agent on the market includes the following components, calculated by weight: 30 parts of alkaline maltodextrin copolymer, 5 parts of Periga O-25, 8 parts of fatty alcohol polyoxyethylene ether AEO-9, and 57 parts of pure water.

[0025] The preparation method of the active anti-staining soaping agent for cotton comprises the following steps: Heat pure water to 60°C, add fatty alcohol polyoxyethylene ether AEO-9 and O-25, stir for 40 minutes, then cool to room temperature, add maltodextrin copolymer and stir for 40 minutes to discharge the material.

[0026] Comparative Example 3 Compared with Example 1, the only difference is that fatty amine polyoxyethylene ether 1815 is not added, and all fatty alcohol polyoxyethylene ether AEO-9 is added, that is, 8 parts of fatty alcohol polyoxyethylene ether AEO-9 are added.

[0027] Comparative Example 4 Compared with Example 1, the only difference is that no polyaspartic acid is added and the amount of pure water added is 74 parts.

[0028] The following is a comparison of the application effects of the auxiliaries finally prepared in Examples 1-3 and Comparative Examples 1-4 in the soaping process after active dyeing of cotton. The specific test method is as follows: 1.1 Preparation before soaping 32-count cotton knitted fabric, electronic balance, small sample dyeing machine at room temperature, active scarlet dye HE-3B, industrial grade sodium sulfate (Na2SO4), soda ash (Na2CO3) Dyeing process: Reactive scarlet dye HE-3B 2% (owf), bath ratio 1:50, stir evenly at 40℃ and dye, add 50g / L of sodium sulfate after 15min, then heat to 60℃, add 20g / L of soda ash, and keep warm for 60min to fix the color.

[0029] 1.2 Soaping after dyeing The anti-staining soaping agents prepared in Example 1 to Comparative Example 3 were unified to have the same solid content.

[0030] Soap washing process: wash the dyed cloth in cold water, then wash it in hot water at 50℃ for 10 minutes, then prepare soap washing liquid with an auxiliary concentration of 2g / L for soap washing, the soap washing temperature is 95℃, the time is 30min, after soap washing, wash it in 70℃ hot water for 10min, finally rinse with cold water and dry.

[0031] 1.3 Determination of the anti-staining effect of anti-staining soaping agent Take a small piece of the dyed cotton cloth and sew it together with a piece of undyed bleached cotton cloth of the same size, treat it at 90°C for 15 minutes, with a bath ratio of 1:50, and then take it out for dehydration and drying. The dosage of the anti-staining soaping agent in Example 1 to Comparative Example 3 with the same solid content is 2g / L.

[0032] 1.4 Evaluation Criteria (1) Rubbing fastness test. Test with reference to "Textiles - Colour fastness to rubbing" (GB / T 3920-1997) and assess according to "Textiles - Grey Scale for Assessment of Staining - Tests for Colour Fastness" (GB / T 251-2008). The higher the grade, the better the rubbing fastness.

[0033] (2) Soap fastness test. Test according to "Textile Colour Fastness Test - Soap Fastness" (GB / T 3921-2008). The higher the grade, the better the fastness to soap washing.

[0034] (3) Determine the K / S value of the stained white cloth using the color characteristic value measuring instrument X-rite Color-Eye 7000A. Evenly select 4 test positions for each dyed sample and measure the K / S value at the maximum absorption wavelength, &max. The lower the K / S value, the better the anti-staining ability.

[0035]

[0036] From the above table, it can be seen that the active anti-staining soaping agent for cotton prepared by the present invention has excellent friction resistance and soaping fastness, strong anti-staining ability, and can exceed the level of conventional soaping agents on the market.

[0037] Compared with Example 1, Example 2 increases the component of polyaspartic acid and reduces the amount of polypyrrolidone. Correspondingly, the friction fastness of the fabric is not significantly improved, and the anti-staining color fastness is slightly reduced. This may be because polyaspartic acid itself has good dispersibility and can wash the floating color and unbound hydrolyzed dyes on the surface of the fabric into water. However, the decrease in anti-staining ability causes this part to be stained back onto the fabric surface, affecting the soaping fastness and anti-staining fastness.

[0038] In Example 3, the dosage of various surfactants is increased, and the emulsification, dispersing and cleaning effects of the surfactants are fully exerted, thereby improving the friction fastness and soap washing fastness. However, the anti-staining ability is weakened. The mechanism of action may be that the non-ionic surfactant has a CMC and can form micelles in the solution. Due to the hydrophobic effect, the dye aggregates are solubilized into the micelles, increasing the dye solubility. When the amount of the non-ionic surfactant continues to increase to exceed the CMC, the micelles increase, while the dye aggregates remain constant. At this time, saturation has been reached, and the solubility no longer increases, and an effective anti-staining effect cannot be achieved.

[0039] The anti-staining ability of Comparative Example 1 without adding polyvinyl pyrrolidone drops sharply, because the lactam structure in the polyvinyl pyrrolidone PVP molecule enables it to form hydrogen bonds or intermolecular forces with organic functional groups such as hydroxyl, amino, and carboxyl groups in the dye molecule, thereby adsorbing the dye and preventing the dye from staining the fabric again. This interaction mechanism makes PVP perform well in anti-staining.

[0040] In Comparative Example 2, the conventional anti-staining soaping agent on the market relies on the combination of the methacrylic copolymer and the nonionic surfactant to provide good emulsification, dispersion and washing effects. It is generally believed that soaping of reactive dyes under alkaline conditions is of great help, but the alkaline methacrylic copolymer is selected as the main component of the soaping agent, and the methacrylic copolymer has poor anti-staining performance and general overall performance. Moreover, such a soaping method requires an additional pickling process, which is time-consuming and labor-intensive.

[0041] Comparative Example 3, in which fatty amine polyoxyethylene ether 1815 is not added, has a relatively large impact on the overall performance of the anti-staining soap detergent, especially the anti-staining ability. This is because fatty amine polyoxyethylene ether 1815 is cationic under acidic conditions, and it contains a relatively long hydrophilic chain segment. At this time, it can be firmly combined with the active dye through electrostatic force, dispersed in water, and form stable aggregates, effectively reducing the "bridging effect" and not easy to stain the fabric surface. However, due to the increase in the proportion of fatty alcohol polyoxyethylene ether AEO-9, the dry and wet abrasion fastness and soap washing fastness of the fabric can basically reach the level of commercially available anti-staining soap detergents. This is because its excellent emulsification, cleaning, and decontamination capabilities make it excellent in cleaning effect.

[0042] Compared with Example 1, various properties in Comparative Example 4 are reduced. This is because the lack of polyaspartic acid greatly reduces the dispersibility of the overall system. Although fatty amine polyoxyethylene ether 1815 and fatty alcohol polyoxyethylene ether AEO-9 have certain dispersibility, it is obviously insufficient. The washed floating color, hydrolyzed dyes, impurities, etc. are easily accumulated on the surface of undyed fibers, causing staining.

[0043] It can be seen that the active anti-staining soaping agent for cotton of the present invention has excellent emulsification, dispersion and oil removal capabilities, can effectively remove floating colors and prevent them from being stained back on fabrics, and can completely surpass the common anti-staining soaping agents on the market in terms of various color fastnesses, optimize the soaping process, save acid water and excessive sewage discharge treatment, reduce costs and save resources; and the raw material cost is low, easy to obtain, green, safe and pollution-free.

[0044] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An active anti-staining soaping agent for cotton, characterized in that: The invention comprises the following raw materials in parts by weight: Polyaspartic acid 30-35 parts Fatty amine polyoxyethylene ether 1815 3-5 parts Fatty alcohol polyoxyethylene ether AEO-9 3-5 parts 1-5 parts of nonionic surfactant 2-5 parts of sodium lauryl sulfate Polyvinyl pyrrolidone 5-8 parts 39-55 parts of pure water.

2. The active anti-staining soaping agent for cotton according to claim 1, characterized in that: The nonionic surfactant is low-foaming nonionic surfactant S-40.

3. The active anti-staining soaping agent for cotton according to claim 1, characterized in that: The polyvinyl pyrrolidone is polyvinyl pyrrolidone PVP-K30.

4. A method for preparing the active anti-staining soaping agent for cotton according to any one of claims 1 to 3, characterized in that: The steps include: (1) Heat pure water to 60-80°C, add fatty amine polyoxyethylene ether 1815 and sodium lauryl sulfate, stir for 20-30 minutes, add polyvinyl pyrrolidone, and stir for 20-30 minutes; (2) Cool to 50-60°C, add polyaspartic acid, and stir for 30-50 minutes; (3) Add fatty alcohol polyoxyethylene ether AEO-9 and nonionic surfactant, and stir for 30-40 minutes to obtain the product.

5. An application of the active anti-staining soaping agent for cotton according to any one of claims 1 to 3, characterized in that: Soap the pure cotton reactive dyed fabric with active anti-staining soaping agent.

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