A solid fabric softener which can be used with detergents, its preparation and use

Abstract

The present application relates to the field of daily chemical washing technology, and more particularly to a solid softening agent which can be used together with a detergent, a preparation method and application thereof. The solid softening agent comprises the following components in percentage by mass: 50-90% of polyethylene glycol, 1-10% of a softening agent, 0-10% of essence, and the rest of starch; the softening agent comprises a fatty amide type tertiary amine; and the solid softening agent does not contain an acidic auxiliary agent. In the solid softening agent, the fatty amide type tertiary amine is used as the softening agent, and the addition amount of the acidic auxiliary agent is controlled within a certain range, so that the softening effect can be ensured, the effect of the softening agent and the detergent will not be greatly affected when the solid softening agent is used together with the detergent, and the solid softening agent can further have good stability.

Description

Technical Field

[0001] This invention relates to the field of daily chemical washing technology, and in particular to a solid fabric softener that can be used with detergents, its preparation method, and its application. Background Technology

[0002] In today's society, with the continuous improvement of living conditions, ordinary fabric (clothes, etc.) cleaning can no longer meet consumers' requirements for fabric washing. On the contrary, the requirements for other aspects of fabrics such as fluffiness, softness, anti-static properties and fragrance retention are getting higher and higher. Therefore, the use of home fabric softeners is becoming more and more frequent.

[0003] Most fabric softeners use cationic surfactants such as ester-based quaternary ammonium salts, imidazoline quaternary ammonium salts, amide quaternary ammonium salts, dialkyl dimethyl quaternary ammonium salts, and cationic organosilicones. By adhering to the fabric surface, they form a hydrophobic film on the fiber surface. In addition, the surfactants themselves are positively charged, while most clothes are negatively charged. Due to the effect of the charge, the surface resistance of the fabric is reduced, thereby playing an antistatic role, reducing friction between fabric fibers, and reducing stiffness. In addition, fabric softeners can also improve the condition of fabric fibers after treatment, reduce fabric deformation, and keep the fabric in a relatively natural state, maintaining a fluffy feel.

[0004] However, the cationic surfactants in fabric softeners are incompatible with the anionic surfactants in most detergents. Using them simultaneously can easily lead to chemical changes, precipitation, or flocculation, affecting both the detergent's cleaning power and the softener's conditioning effect. For these reasons, existing fabric softeners cannot be used with detergents. They must be added separately and used in separate steps; the washing and softening stages must be performed separately. Currently, the common fabric softening method involves adding liquid softener during the rinsing stage after the washing cycle or adding solid softener sheets during the drying process. This incompatibility between fabric softeners and detergents increases the complexity of the laundry process and makes fabric care more difficult. Summary of the Invention

[0005] To address the technical problem that existing fabric softeners, when used in conjunction with detergents, result in a reduction in the effectiveness of both the softener and the detergent, this invention provides a solid fabric softener that can be used with detergents. This solid fabric softener exhibits good softening properties and stability, and when used with detergents, it does not significantly affect the effectiveness of either the softener or the detergent.

[0006] The specific technical solution of this invention is as follows:

[0007] In a first aspect, the present invention provides a solid fabric softener that can be used with detergents, comprising, by mass percentage: 50%–90% polyethylene glycol, 1%–10% softener, 0%–10% fragrance, and the balance starch; wherein the softener comprises a fatty amide-type tertiary amine; and wherein the solid fabric softener does not contain acidic additives.

[0008] This invention uses fatty amide-type tertiary amines as softeners, which ensures softening effects while preventing a significant reduction in the effectiveness of both the softener and detergent when used together. The reason is as follows:

[0009] 1) Fatty amide type tertiary amines have the characteristics of both cationic and nonionic surfactants. They have a low degree of ionization under neutral conditions. When coexisting with anionic surfactants in detergents in aqueous solution, they not only do not produce precipitation or flocculation, but also can play a solubilizing role for the softener when combined with an excess of anionic surfactants.

[0010] 2) Fatty amide-type tertiary amines have better emulsifying and solubilizing effects than existing softeners. When used with anionic surfactants, the minimum surface tension (γcmc) and critical micelle concentration (cmc) of the compound system are lower than those of the single surfactant system, which greatly reduces the intermolecular repulsion and makes the molecules more compact, thereby greatly improving the surface activity of the compound system, that is, achieving both detergency and softening.

[0011] 3) The melting point of fatty amide-type tertiary amines is close to that of polyethylene glycol, and they can be completely melted in polyethylene glycol. They have good compatibility, which allows polyethylene glycol to better coat fatty amide-type tertiary amines.

[0012] Furthermore, unlike traditional acidic systems, this invention employs a neutral formulation system (free from acidic additives such as hydroxymethylene diphosphonic acid, hydrochloric acid, citric acid, lactic acid, glutamic acid, etc.), combined with fatty amide-type tertiary amines. This facilitates the simultaneous use of fabric softener and detergent because, in a neutral environment, fatty amide-type tertiary amines can form stable electrically neutral salt solutions with anionic surfactants, thereby inhibiting the ionization of cations and ensuring the stability of the anionic / cationic composite aqueous solution during washing.

[0013] In addition, fatty amide-type tertiary amines have a high melting point and are not prone to collapsing or oiling. Therefore, the solid fabric softener of the present invention also has good stability at room temperature, high temperature and high temperature and high humidity.

[0014] Preferably, the fatty amide-type tertiary amine has a mass percentage content of 10% to 100% in the softener.

[0015] Preferably, the softener also includes one or more of the following: ester-based quaternary ammonium salts, imidazoline quaternary ammonium salts, cationic organosilicon, and polyether-modified silicone oils.

[0016] Furthermore, the softener comprises an ester-based quaternary ammonium salt and a fatty amide-type tertiary amine in a mass ratio of 1:0.53 to 1.

[0017] When ester-based quaternary ammonium salts and fatty amide-type tertiary amines are combined as softeners and their ratio is controlled within a certain range, the ester-based quaternary ammonium salts and fatty amide-type tertiary amines adsorb onto the fabric surface during washing, exhibiting a synergistic effect that results in a softening effect superior to using either alone. This is mainly because during washing, the ester-based quaternary ammonium salts attract the negative charge on the fabric surface, adsorbing onto the fabric fibers. The exposed hydrophobic ends of the fabric surface interact hydrophobically with the carbon chain ends of the fatty amide-type tertiary amine, promoting a tighter arrangement of the two softener molecules. Ultimately, a structurally stable bilayer adheres to the fabric fiber surface. The hydrophobic portion forms a barrier in the aqueous solution, effectively reducing static electricity and inter-fiber friction, allowing the fibers to stretch and preventing them from clumping together, thus achieving a better softening effect.

[0018] When the mass ratio of ester-based quaternary ammonium salts and fatty amide-type tertiary amines is controlled within the range of 1:0.53 to 1, a good softening effect can be achieved, and the solid fabric softener can be given good stability. When the relative amount of fatty amide-type tertiary amines is too large, only a portion of the fatty amide-type tertiary amines will be neatly arranged on the surface of the ester-based quaternary ammonium salt through hydrophobic interactions with the hydrophobic groups of the ester-based quaternary ammonium salt, forming a bilayer film on the fabric surface. The excess fatty amide-type tertiary amine molecules cannot be indirectly attached to the surface of the fabric fibers, which does not help the softening effect and will also waste resources, thus causing a decrease in the softening effect. When the relative amount of fatty amide-type tertiary amines is too small, the ester-based quaternary ammonium salt is prone to oiling and softening under high temperature conditions, which will cause a decrease in product stability, poor molding, and poor synergistic effect with fatty amide-type tertiary amines, resulting in poor softening effect. In addition, when the solid fabric softener is used with detergent, the effect of both the fabric softener and the detergent will be significantly weakened.

[0019] Preferably, the alkyl carbon chain length of the fatty amide in the fatty amide-type tertiary amine is C13 to C17.

[0020] Furthermore, the general structural formula of the fatty amide-type tertiary amine is as follows:

[0021]

[0022] Wherein, R is an alkyl group of C13 to C17.

[0023] Furthermore, the fatty amide-type tertiary amine is stearamidopropyl dimethylamine.

[0024] Among fatty amide-type tertiary amines, those with R = C8 to C22 exhibit good stability and surface activity. However, due to the less orderly arrangement of carbon chains at C12 and below, their surface activity weakens, affecting their adsorption and softening properties on fabrics. Longer carbon chains result in stronger surface activity, stronger adsorption on fabrics, and consequently, a stronger softening effect. However, excessively long carbon chains can affect their water solubility and compatibility with water-soluble carriers, thus impacting the molding of solid fabric softeners. Therefore, this invention preferably uses fatty amide-type tertiary amines with alkyl carbon chain lengths of C13 to C17, enabling solid fabric softeners to possess both good softening and molding effects.

[0025] Based on this, when stearamide propyl dimethylamine (R=C17) is used, it has good stability and good compatibility with water-soluble polyethylene glycol carrier, does not affect the molding of the softening beads, and can further improve the softening effect. Therefore, stearamide propyl dimethylamine is used as a further preferred option.

[0026] Preferably, the polyethylene glycol has a molecular weight range of 2000 to 10000.

[0027] Preferably, the fragrance comprises unencapsulated liquid fragrance and / or microcapsule fragrance.

[0028] Secondly, the present invention provides a method for preparing the solid fabric softener, comprising the following steps: heating and melting polyethylene glycol, then sequentially adding an acidic additive, a softener, a fragrance, and starch, mixing well, and granulating to obtain the solid fabric softener.

[0029] Thirdly, the present invention provides the application of the solid fabric softener in fabric softening treatment, including the following steps: adding the solid fabric softener together with the detergent during fabric washing.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] (1) In the solid fabric softener of the present invention, fatty amide type tertiary amine is used as softener and a neutral formulation system is adopted. This ensures the softening effect while ensuring that the solid fabric softener does not significantly affect the effect of the fabric softener and detergent when used together. In addition, it can also give the solid fabric softener better stability.

[0032] (2) In the solid fabric softener of the present invention, polyethylene glycol is used as the coating material to wrap the softener and fragrance. The production process is simple and the raw materials are cheap. It makes up for the deficiency of existing fragrance beads on the market that only retain fragrance, and gives them a softening effect, increasing the diversity of product effects.

[0033] (3) In the solid fabric softener of the present invention, an ester-based quaternary ammonium salt and a fatty amide-type tertiary amine are compounded and their ratio is controlled within a certain range. The two can produce a good synergistic effect, which can improve the softening effect to a greater extent, while making the solid fabric softener have good stability.

[0034] (4) In the solid fabric softener of the present invention, by selecting a fatty amide type tertiary amine with a specific alkyl carbon chain length, the softening effect of the solid fabric softener can be further improved and it can have a better molding effect. Detailed Implementation

[0035] The present invention will be further described below with reference to embodiments.

[0036] General Implementation Examples

[0037] A solid fabric softener that can be used with detergents, comprising the following components by weight percentage: 50%–90% polyethylene glycol, 1%–10% softener, 0%–10% fragrance, and the balance starch; wherein the softener includes fatty amide-type tertiary amines; and wherein the solid fabric softener does not contain acidic additives.

[0038] In one specific embodiment, the fatty amide-type tertiary amine has a mass percentage content of 10% to 100% in the softener.

[0039] In one specific embodiment, the softener further includes one or more of ester-based quaternary ammonium salts, imidazoline quaternary ammonium salts, cationic organosilicon, and polyether-modified silicone oils.

[0040] In one specific embodiment, the softener comprises an ester-based quaternary ammonium salt and a fatty amide-type tertiary amine in a mass ratio of 1:0.53 to 1.

[0041] In one specific embodiment, the alkyl carbon chain length of the fatty amide in the fatty amide-type tertiary amine is C13 to C17.

[0042] In one specific embodiment, the fatty amide-type tertiary amine is stearamide propyl dimethylamine.

[0043] In one specific embodiment, the molecular weight of the polyethylene glycol ranges from 2000 to 10000.

[0044] In one specific embodiment, the fragrance includes unencapsulated liquid fragrance and / or microcapsule fragrance.

[0045] A method for preparing the solid fabric softener includes the following steps: heating and melting polyethylene glycol, then sequentially adding an acidic additive, a softener, a fragrance, and starch, mixing well, and granulating to obtain the solid fabric softener.

[0046] The application of the solid fabric softener in fabric softening treatment includes the following steps: adding the solid fabric softener together with the detergent during fabric washing.

[0047] Without further detailed explanation, those skilled in the art can utilize the present invention to its fullest extent using the above description. The following embodiments are intended to further illustrate and demonstrate specific implementations within the scope of the present invention. Therefore, the embodiments should be understood as being used only to illustrate the present invention in more detail, and not to limit the scope of the present invention in any way. Unless otherwise specified, the raw materials used in the embodiments are all available from conventional commercial sources.

[0048] Examples 1-8 and Comparative Examples 1-4

[0049] The formulations of the solid fabric softeners (fabric beads) in Examples 1-8 and Comparative Examples 1-4 are shown in Tables 1-4. In Tables 1-4, "-" indicates an amount of 0; the amounts of each raw material are mass fractions.

[0050] Table 1. Formulas of softener beads in Example 1 and Comparative Examples 1-2

[0051]

[0052] Table 2. Formulas of softener beads in Examples 2-5

[0053]

[0054] Table 3. Formulas of softener beads in Example 6 and Comparative Examples 3-4

[0055]

[0056]

[0057] Table 4. Formulas for softener beads in Examples 7-8

[0058] Example 7 Example 8 raw material mass fraction / % mass fraction / % polyethylene glycol 78.5 78.5 Citric acid monohydrate 3 3 Ester quaternary ammonium salt 2 2 Myristamidopropyl dimethylamine 2 － Lauroamide propyl dimethylamine － 2 Industrial corn starch 8.5 8.5 Rose essence 6 6

[0059] The preparation methods of the solid fabric softener (fabric softener beads) in Examples 1-8 and Comparative Examples 1-4 are as follows:

[0060] S1: Add polyethylene glycol to the mixing container, control the temperature at 75-80℃, and stir until it becomes a uniform liquid.

[0061] S2: Under heat preservation conditions, add acidic additives (citric acid monohydrate or HCl solution or none, depending on the formula in Tables 1-4) and softeners (stearoamide propyl dimethylamine, bispalmitoyl carboxyethyl hydroxyethyl methyl sulfate ammonium salt, polydimethylsiloxane, myristamidopropyl dimethylamine or lauramide propyl dimethylamine, depending on the formula in Tables 1-4) to the stirring container in sequence, and stir to disperse evenly.

[0062] S3: Continue to quickly add essence to the stirring container under heat preservation conditions, stir evenly, and then add industrial corn starch and stir evenly.

[0063] S4: Pass the mixture in the stirring container into granulation equipment for granulation, and after the particles solidify and cool, package them to obtain fabric softening beads.

[0064] Comparative Examples 5 - 8

[0065] Comparative Example 5 is a commercially available liquid fabric softener of Comfort, purchased from the Tmall flagship store of Unilever.

[0066] Comparative Example 6 is a commercially available fabric softening and fragrance - retaining beads of Downy, purchased from the Tmall flagship store of Procter & Gamble.

[0067] Comparative Example 7 is a commercially available fabric - protecting and fragrance - retaining beads of Liby, purchased from the Tmall flagship store of Liby.

[0068] Comparative Example 8 is a commercially available fabric - protecting and fragrance - retaining beads of超能, purchased from the Tmall flagship store of超能.

[0069] Test Example 1: Stability test

[0070] Perform stability tests on the test samples (Examples 1 - 8 and Comparative Examples 1 - 4, 6 - 8), and the test method is as follows:

[0071] (1) Stability test conditions:

[0072] Normal - temperature stability: Place each test sample in an open bottle at 45 ± 2°C for 4 weeks, and directly observe.

[0073] High - temperature stability: Place each test sample in an open bottle at 45 ± 2°C for 4 weeks, and then observe the appearance and smell in an environment restored to room temperature of 25 ± 5°C.

[0074] High - temperature and high - humidity stability: Place each test sample in an open bottle at 45 ± 2°C, 70% RH for 4 weeks, and then observe the appearance and smell in an environment restored to room temperature of 25 ± 5°C.

[0075] (2) Stability evaluation criteria:

[0076] Use “—” to indicate that the sample has no obvious changes in smell and appearance, belonging to the acceptable range and the stability is qualified; use “+” to indicate that the sample has serious appearance discoloration or produces an unpleasant smell, and the stability is unqualified, and the number of “+” indicates the severity of discoloration and abnormal smell. The more “+” there are, the more obvious the abnormal phenomenon is and the more unstable the sample is. The stability test results are shown in Tables 5 - 9.

[0077] Table 5 Stability test results of Example 1 and Comparative Examples 1 - 2 <​​

[0079] Table 6. Stability test results of Examples 2-5

[0080]

[0081] Table 7 shows the stability test results of Example 5 and Comparative Examples 3-4.

[0082]

[0083] Table 8 shows the stability test results of Examples 7-8.

[0084]

[0085] Table 9 shows the stability test results of comparative examples 6 and 7.

[0086]

[0087]

[0088] Analyzing the stability test results in Tables 5-9, we can see that:

[0089] (1) In Example 1, stearamidopropyl dimethylamine was used as a softener, while in Comparative Examples 1 and 2, silicone oil emulsion and ester-based quaternary ammonium salt were used as softeners, respectively. The softener beads of Example 1 exhibited good stability at room temperature, high temperature, and high temperature and humidity. The high temperature and humidity stability was significantly higher than that of Comparative Examples 1 and 2, and the high temperature and high temperature and humidity stability were significantly higher than those of the commercially available softener beads of Comparative Examples 6 and 7. This is because stearamidopropyl dimethylamine has a high melting point, reaching 67°C. Therefore, when stability was tested at 45°C, it did not collapse or release oil. In contrast, the ester-based quaternary ammonium salt and polydimethylsiloxane raw materials have lower melting points, generally below 45°C. Therefore, these raw materials melted and released oil during stability testing, resulting in poor stability.

[0090] (2) Examples 2-5 all used a blend of ester-based quaternary ammonium salt and stearamidopropyl dimethylamine as a softener, with mass ratios of 1:1, 1:0.54, 1:1.86, and 1:0.21, respectively. The softener beads of Examples 2 and 3 exhibited good stability at room temperature, high temperature, and high temperature and humidity, while the high temperature and high temperature and humidity stability of Example 5 was poor. This indicates that when the relative amount of ester-based quaternary ammonium salt is too high, the softener beads will have poor high temperature and humidity stability. This is because when the amount of stearamidopropyl dimethylamine is too low, the stearamidopropyl dimethylamine cannot completely cover the surface of the ester-based quaternary ammonium salt due to the hydrophobic effect of the hydrophobic groups of the two substances, thus forming molecular protection. Therefore, the ester-based quaternary ammonium salt is prone to melting and oiling under high temperature and humidity.

[0091] (3) The high temperature and high humidity stability results of Comparative Examples 3 and 4 were poor, and were not as good as those of Example 6. This is mainly because polyethylene glycol is prone to react with some acidic agents at high temperature under acidic conditions, so yellowing and other conditions may occur during stability testing.

[0092] Test Example 2: Smoothing Effect Test

[0093] The softening effect of the samples (Examples 1-8 and Comparative Examples 1-8) was tested, and the test method is as follows:

[0094] (1) Pretreatment of pure cotton white towels:

[0095] Select 36 pure cotton white towels (weighing approximately 100g each) and wash them in a top-loading washing machine. Add 30g of national standard laundry detergent to the inner drum of the washing machine, set the water level to 17L, and wash the towels three times using the usual mode until they become stiff. After drying, cut the towels into 10cm x 10cm pieces for later use.

[0096] (2) Preparation of experimental solution (0.25% by mass):

[0097] Weigh 5g of the sample into a beaker, add pure water to make 2kg, and stir the solution until it is homogeneous before use.

[0098] (3) Softness test:

[0099] The treated fabric samples were divided into 9 groups, with 4 pieces used for each group. The long and short sides of each piece of fabric were marked. The test fabric samples were immersed in the experimental solution for 5 minutes. After shaking each sample 10 times in one direction, the water was wrung out, and the samples were naturally air-dried indoors (using clips to hold the short side). After drying, the softness of the towels after washing was tested using a softness meter (DRK119A, Shandong Derek). The results are shown in Table 10. The lower the softness value of the sample, the better the softness effect.

[0100] Table 10. Results of softening effect tests for Examples 1-8 and Comparative Examples 1-8

[0101] Test sample Softness / mN Example 1 498.1 Comparative Example 1 533.8 Comparative Example 2 461.8 Example 2 399.5 Example 3 434.2 Example 4 498.5 Example 5 447.1 Example 6 408.2 Comparative Example 3 373.4 Comparative Example 4 468.1 Example 7 455.6 Example 8 471.3 Comparative Example 5 351.7 Comparative Example 6 418.9 Comparative Example 7 527.4 Comparative Example 8 587.1

[0102] Analyzing the results of the smoothing effect test in Table 10, we can see that:

[0103] (1) The softening effect of Example 1 is better than that of Comparative Example 1. This indicates that stearamidopropyl dimethylamine has a better softening effect than silicone oil emulsion.

[0104] (2) The softening effect of Examples 2 and 3 is better than that of Examples 1 and Comparative Example 2, Example 4 is similar to that of Example 1, and Example 5 is significantly worse than that of Examples 2 and 3. This indicates that when ester-based quaternary ammonium salt and stearamide propyl dimethylamine are compounded as softeners and their ratio is controlled within a certain range, they can produce a synergistic effect, and the softening effect is better than that of using either one alone. When the relative amount of stearamide propyl dimethylamine is too large or too small, the synergistic effect will be poor. This is because when a certain proportion of ester-based quaternary ammonium salt and fatty amide-type tertiary amine are compounded, during the washing process, the ester-based quaternary ammonium salt can attract the negative charge on the fabric surface and adsorb onto the fabric fiber surface. The exposed hydrophobic end of the fabric surface has a hydrophobic interaction with the carbon chain end of the fatty amide-type tertiary amine, thereby promoting a more compact arrangement of the two softener molecules. Finally, a structurally stable bilayer is attached to the fabric fiber surface. The hydrophobic part forms a barrier in the aqueous solution to cover the fabric surface, which can effectively reduce the static electricity of the fabric surface fibers and the friction between fibers, making the fibers stretch and less prone to sticking together, thereby obtaining a better softening effect.

[0105] (3) Softening effect Example 2 > Example 7 > Example 8. This shows that in fatty amide tertiary amines, the longer the carbon chain, the better the softening effect. This is because: the longer the carbon chain in fatty amide tertiary amines, the stronger the surface activity, the stronger the adsorption on the fabric, and the stronger the corresponding softening effect.

[0106] Test Example 3: Evaluation of the impact on the detergency of detergents

[0107] The test samples (Examples 1-8 and Comparative Examples 1-8) were evaluated for their effect on the detergency of the detergent. The test methods are as follows:

[0108] (1) Pretreatment of soiled cloth:

[0109] JB-01, JB-02, and JB-03 standard soiled cloths were cut into 6cm x 6cm pieces. Each test group contained 3 pieces of JB-01, JB-02, and JB-03 standard soiled cloths. The whiteness of each type before washing was measured using a whiteness meter.

[0110] (2) Washing soiled cloths:

[0111] Weigh 2g of the sample and add it to the stain removal drum along with 2g of laundry detergent (prepared according to the standard laundry detergent formula in Appendix B of GB / T 13174-2021). Add 250ppm of hard water to bring the weight to 1000g. Place the stain removal drum into the corresponding stain removal machine tank and place the corresponding stirring paddle in the inner drum. Turn on the stain removal machine to stir. After the sample is dissolved and the temperature inside the drum reaches 30℃, stop stirring and put in the tested soiled cloth. Turn on the stain removal machine to wash for 20 minutes.

[0112] (3) Detergent power test:

[0113] After washing, the soiled cloth was rinsed and dehydrated twice and hung to dry at room temperature. After drying, the whiteness was measured, and the difference in whiteness between the soiled cloth before and after washing was calculated. The stain removal ratio of the sample was calculated according to formulas (1) and (2) to determine the influence of the sample on the stain removal power of the laundry detergent. The stain removal power results are shown in Table 11. When the P value is ≥1.0, it indicates that the sample does not affect the stain removal effect; when the P value is <1.0, it indicates that the sample affects the stain removal effect of the laundry detergent.

[0114] in:

[0115] R i —The stain removal value of a certain soiled cloth;

[0116] F1 i —The spectral emissivity of a certain soiled cloth before washing, in %;

[0117] F2 i —The spectral emissivity of a certain soiled cloth after washing, in %.

[0118] n – the quantity of this type of soiled cloth.

[0119] in:

[0120] P i —The ratio of the stain removal value of a certain soiled cloth to that of a standard laundry detergent (standard laundry detergent, formulated according to the standard laundry detergent formula in Appendix B of GB / T 13174-2021); (rounded to one decimal place)

[0121] R 试样 —The stain removal value of the soiled cloth sample;

[0122] R 国标 —The stain removal value of the compared soiled cloth.

[0123] Table 11 Evaluation results of the effects of Examples 1-8 and Comparative Examples 1-8 on the detergency of detergents

[0124]

[0125] Analyzing the evaluation results of the influence of detergent detergency in Table 11, it can be seen that:

[0126] (1) Compared to Example 1, the softener beads in Comparative Examples 1 and 2 caused a greater decrease in the detergency of the detergent. This indicates that compared to conventional fabric softeners (ester-based quaternary ammonium salts, polydimethylsiloxane, and commercially available softener beads), fatty amide-type tertiary amines have less impact on the detergent's effectiveness when used together with it. This is because fatty amide-type tertiary amines possess the characteristics of both cationic and nonionic surfactants. They have a low degree of ionization under neutral conditions. When coexisting with anionic surfactants in an aqueous solution, they not only do not produce precipitation or flocculation, but also, when combined with an excess of anionic surfactants, can solubilize the fabric softener. Furthermore, fatty amide-type tertiary amines have better emulsifying and solubilizing effects than existing fabric softeners. When used together with anionic surfactants, the minimum surface tension and critical micelle concentration of the compound system are lower than those of a single surfactant system, which greatly reduces the intermolecular repulsion and makes the molecules more compact, thereby greatly improving the surface activity of the composite system, achieving both detergency and softening in one.

[0127] (2) Compared with Examples 2 and 3, the fabric softener beads in Example 5 caused a greater decrease in the detergency of the detergent. This indicates that in the compound system of ester-based quaternary ammonium salt and fatty amide-type tertiary amine, when the amount of ester-based quaternary ammonium salt is too large, the fabric softener will have a greater impact on the detergency of the detergent.

[0128] (3) Compared to Example 6, the fabric softener beads in Comparative Examples 3 and 4 caused a greater decrease in the detergency of the detergent. This indicates that the addition of acidic additives increases the influence of fabric softener on the detergency of the detergent. This is because: in a neutral environment, fatty amide-type tertiary amines can form a stable electrically neutral salt solution with anionic surfactants, thereby inhibiting the ionization of cations and ensuring the stability of the anion / cationic composite aqueous solution during washing; while an acidic environment is not conducive to the formation of such an electrically neutral salt solution.

[0129] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0130] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A solid fabric softener which is compatible with detergents, characterized in that, The solid softener comprises the following components by mass percentage: polyethylene glycol 50-90%, softener 1-10%, essence 0-10%, and starch in the balance; the softener comprises ester quaternary ammonium salt and fatty amide type tertiary amine in a mass ratio of 1:0.53-1, the fatty amide type tertiary amine is stearamidopropyl dimethylamine, and the ester quaternary ammonium salt is dipalmitoyl carboxyethyl hydroxyethyl methyl sulfate ammonium salt; and the solid softener does not contain an acidic auxiliary agent.

2. The solid conditioner of claim 1 wherein, The mass percentage content of the fatty amide type tertiary amine in the softener is 10-100%.

3. The solid conditioner according to claim 1 or 2, wherein The softener further comprises imidazoline quaternary ammonium salt.

4. The solid conditioner of claim 1 or 2, wherein The softener further comprises cationic silicone.

5. The solid conditioner of claim 1 or 2, wherein the solid conditioner is a solid shampoo. The softener further comprises polyether modified silicone oil.

6. The solid conditioner of claim 1 wherein, The polyethylene glycol has a molecular weight in the range of 2000-10000.

7. The solid conditioner of claim 1 wherein, The essence comprises unencapsulated liquid perfume and / or microcapsule perfume.

8. A process for the preparation of a solid conditioner as claimed in any one of claims 1 to 7, characterised in that, The method comprises the following steps: After the polyethylene glycol is heated and melted, the softener, the essence and the starch are sequentially added thereto, and then mixed and granulated to obtain the solid softener.

9. Use of a solid softener according to one of claims 1 to 7 for the softening treatment of textiles, characterized in that, The method comprises the following steps: During fabric washing, the solid softener is added together with the detergent.

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