A fabric softener composition containing a wire drawing rheology aid and a process for its preparation

Abstract

The application discloses a fabric softener composition containing a drawing rheological additive and a preparation method thereof. The composition comprises a cationic softening active substance, a drawing rheological additive, a compatible stabilizer, an acidity regulator and deionized water. The drawing rheological additive is a hydrophobic association type cationic polyacrylamide formed by copolymerization of acrylamide, a cationic monomer and a hydrophobic monomer. The mass ratio of the drawing rheological additive to the cationic softening active substance is 1:25-1:180, and the pH value of the composition is 2.0-4.0. In the preparation, the drawing rheological additive is first dispersed and hydrated in part of the deionized water, then a softening base solution is prepared, and the two are mixed at low speed and then discharged. The softener obtained by the application has continuous and uniform drawing effect, good high and low temperature storage stability, fabric softening and care performance and low fabric yellowing degree, and the preparation process is simple and suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of daily washing chemical technology, specifically relating to a fabric softener composition containing a drawing rheology modifier and its preparation method. Background Technology

[0002] Fabric softeners are typically used for rinsing and conditioning clothes after washing. Their main active ingredient is a cationic softening agent. Cationic softening agents can adhere to the surface of fabric fibers, reducing friction between fibers and thus improving the fabric's softness, fluffiness, and antistatic properties. As consumers increasingly demand a better user experience and higher quality appearance from fabric care products, in addition to basic softening properties, the flow pattern of the softener during pouring, its continuity of strand formation, and its long-term storage stability are also becoming important factors affecting product quality.

[0003] Existing fabric softeners typically use thickening agents such as hydroxyethyl cellulose, guar gum, and nonionic thickeners to adjust the system viscosity. However, these thickening agents mainly improve product consistency by increasing the static viscosity of the system, making it difficult for the softener to form continuous and unbreakable strands during pouring. Furthermore, some conventional thickening agents have poor compatibility with high-concentration cationic softening agents, and are prone to layering, turbidity, gelation, clumping, or precipitation during storage at room temperature, high temperature, or low temperature, affecting the product's appearance and performance.

[0004] Furthermore, some polymeric thickeners may affect the adsorption of cationic softening agents on the surface of fabric fibers, reducing the softening and care properties of the softener and potentially causing white or light-colored fabrics to yellow over time. Increasing the amount of thickener alone to improve the fiber-drawing effect may result in excessively high system viscosity or even gel formation, hindering product pouring, dispersion, and industrial production. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a fabric softener composition containing a drawing rheology modifier and its preparation method. Without reducing the fabric's softness and care properties, the softener achieves continuous and uniform drawing rheological characteristics, while also ensuring high and low temperature storage stability and low yellowing performance.

[0006] The technical solution provided by this invention is as follows: On the one hand, a fabric softener composition containing a drawing rheology modifier, comprising the following components by weight percentage: Cationic softening active ingredient 3.0%–22.0%; Rheology modifier for wire drawing: 0.08%–1.2%; Compatibility stabilizer: 0.1%–2.0%; Acidity regulator 0.05%–0.6%; and Deionized water, replenish to 100%; The rheology modifier is a hydrophobic associative cationic polyacrylamide formed by copolymerization of acrylamide, cationic monomers and hydrophobic monomers. The content of hydrophobic monomers is 0.5 mol% to 3.0 mol% based on the total molar number of monomers constituting the hydrophobic associative cationic polyacrylamide, and the number of carbon atoms in the hydrophobic chain of the hydrophobic monomer is C8 to C18. Hydrophobic associative cationic polyacrylamide has a molecular weight of 1.2 million to 6 million and a cationicity of 15% to 40%. The mass ratio of the fabric rheology modifier to the cationic softening active ingredient is 1:25 to 1:180, and the pH value of the fabric softener composition is 2.0 to 4.0.

[0007] In some embodiments, the cationic monomer is methacryloyloxyethyltrimethylammonium chloride, and the hydrophobic monomer is selected from at least one of N-dodecylacrylamide and octadecyl methacrylate.

[0008] In some embodiments, the critical associative concentration of the hydrophobic associative cationic polyacrylamide is 50 mg / L to 300 mg / L; when a steady-state shear rheological test is performed at 25°C, the flow index n of a 1% aqueous solution of the hydrophobic associative cationic polyacrylamide is 0.15 to 0.35 in the range of shear rate from 0.01 s⁻¹ to 1000 s⁻¹.

[0009] In some embodiments, the cationic softening active ingredient is selected from at least one of ester-based quaternary ammonium salts, dioctadecyl dimethyl ammonium chloride, amino polyether silicone oil, and imidazoline quaternary ammonium salts.

[0010] In some embodiments, the cationic compliant active ingredient includes distearylethyl dimethylammonium chloride.

[0011] In some embodiments, the compatibility stabilizer is selected from one or more of propylene glycol, glycerin, polyethylene glycol 200, polyethylene glycol 300, polyethylene glycol 400 and polyethylene glycol 600; the acidity regulator is selected from at least one of citric acid and lactic acid.

[0012] In some embodiments, auxiliary agents are also included, which are selected from one or more of fragrance, preservative and pearlescent agent; the content of fragrance is 0.01% to 1.5% based on the total mass of the fabric softener composition, the content of preservative is 0.02% to 0.3% and the content of pearlescent agent is 0.1% to 0.8%.

[0013] On the other hand, a method for preparing a fabric softener composition containing a drawing rheology modifier includes the following steps: S1. Take 60% to 70% of the total mass of the fabric softener composition of deionized water, control the temperature of the deionized water to 20℃ to 30℃, add the drawing rheology agent while stirring, and continue stirring for 40 min to 60 min to disperse and hydrate the drawing rheology agent to obtain a pre-dispersion of the drawing rheology agent. S2. Heat the remaining deionized water to 40℃~50℃, add compatibility stabilizer and acidity regulator and stir to dissolve, then add cationic softening active ingredient and continue stirring to obtain softening base solution; S3. Add the pre-dispersion of the drawing rheology modifier to the softening base liquid and mix for 25 min to 40 min under stirring conditions lower than the stirring speed used in step S1 to obtain the compound solution. S4. Add or not add auxiliary agents to the compound solution, and add deionized water to 100% of the total mass of the fabric softener composition. Stir evenly and let stand to defoam, to obtain a fabric softener composition containing a drawing rheology auxiliary agent.

[0014] In some embodiments, in step S2, the cationic softening active material is added and stirred for 15 min to 25 min; in step S3, the pre-dispersion of the drawing rheology modifier is added to the softening base liquid at a uniform speed.

[0015] In summary, the beneficial effects of this invention are: (1) This invention uses hydrophobic associative cationic polyacrylamide as a drawing rheology modifier, and limits the hydrophobic monomer structure, molecular weight, cationicity, and mass ratio of the drawing rheology modifier to the cationic flexible active material. The hydrophobic groups in the drawing rheology modifier can form a reversible physical association network in the composition, so that the composition maintains a high structural viscosity under low shear conditions and undergoes shear thinning under the high shear action generated by pouring, thereby forming continuous, uniform and non-breakable filaments; after the shear action disappears, the association network can reform, which is beneficial to maintaining stable drawing rheological properties.

[0016] (2) The rheology modifier of the present invention has cationic groups and has good system compatibility with cationic softening actives. Through the synergistic effect of compatibility stabilizers and acidity regulators, it reduces the aggregation between polymers and cationic softening actives, reduces the possibility of layering, gelation, clumping and precipitation of the composition during high temperature or low temperature storage, and improves the long-term storage stability of the softener.

[0017] (3) By controlling the amount of rheology modifier added and its ratio with cationic softening active material, the present invention can achieve the drawing effect while reducing the interference of rheology modifier on the adsorption of cationic softening active material on the surface of fabric fibers, so that the composition can maintain good fabric softness, fluffiness and antistatic properties, and reduce the degree of yellowing of white fabric treated with softener during long-term storage.

[0018] (4) The preparation method of the present invention first fully disperses and hydrates the drawing rheology modifier in deionized water at room temperature, and then slowly compoundes the obtained drawing rheology modifier pre-dispersion with the softening base liquid. This can reduce the agglomeration of the drawing rheology modifier during the feeding process and reduce the damage to the hydrophobic association network caused by excessive mechanical shearing. The entire preparation process adopts medium and low temperature operation, does not require high temperature and high pressure equipment, the process steps are simple, the operating conditions are easy to control, and it is suitable for industrial production. Detailed Implementation

[0019] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. The following embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0020] The cationic softening active ingredient of this invention is used to adsorb onto the surface of fabric fibers, reducing friction between fabric fibers, thereby improving the softness, fluffiness, and antistatic properties of the fabric. The cationic softening active ingredient can be selected from at least one of ester-based quaternary ammonium salts, dioctadecyl dimethyl ammonium chloride, amino polyether silicone oil, and imidazoline quaternary ammonium salts. The following examples use distearyl ethyl ester dimethyl ammonium chloride as the cationic softening active ingredient.

[0021] The rheology modifier described in this invention is a hydrophobically associating cationic polyacrylamide, formed by copolymerization of acrylamide, a cationic monomer, and a hydrophobic monomer. The cationic monomer can be methacryloyloxyethyltrimethylammonium chloride, and the hydrophobic monomer can be selected from at least one of N-dodecylacrylamide and octadecyl methacrylate. Based on the total molar number of monomers constituting the hydrophobically associating cationic polyacrylamide, the content of the hydrophobic monomer is 0.5 mol% to 3.0 mol%, and the number of carbon atoms in the hydrophobic chain of the hydrophobic monomer is C8 to C18.

[0022] The following examples use hydrophobic associative cationic polyacrylamide that meets the following specifications: molecular weight of 3 million, cationicity of 28%, and critical association concentration of 50 mg / L to 300 mg / L. Below the critical association concentration, the polymer exists mainly in the form of relatively dispersed molecular chains; above the critical association concentration, hydrophobic groups on different molecular chains associate with each other to form a reversible physical cross-linked network.

[0023] The critical association concentration can be determined using the pyrene fluorescence probe method. Specifically, a series of hydrophobic associating cationic polyacrylamide aqueous solutions with concentrations ranging from 0.001% to 2.0% are prepared, and the pyrene fluorescence intensity ratio I1 / I3 of each concentration is measured. A curve is plotted with polymer concentration on the x-axis and fluorescence intensity ratio I1 / I3 on ​​the y-axis. The polymer concentration corresponding to the point where the slope of the curve changes significantly is determined as the critical association concentration.

[0024] Steady-state shear scans of a 1% hydrophobic associative cationic polyacrylamide aqueous solution were performed using a rotational rheometer at 25 °C. The shear rates ranged from 0.01 s⁻¹ to 1000 s⁻¹. The change in apparent viscosity with shear rate was recorded and fitted according to the power-law equation η = K·γ̇ⁿ⁻¹, where η is the apparent viscosity, K is the consistency coefficient, γ̇ is the shear rate, and n is the flow index.

[0025] Test results show that the hydrophobically associating cationic polyacrylamide aqueous solution has a flow index n of 0.15 to 0.35, a low shear viscosity of 2000 mPa·s to 8000 mPa·s at a shear rate of 0.01 s⁻¹, and a high shear viscosity of 5 mPa·s to 20 mPa·s at a shear rate of 1000 s⁻¹, exhibiting significant shear-thinning characteristics.

[0026] In the storage or low-shear state, the associated network formed between hydrophobic groups can improve the structural viscosity and storage stability of the composition; under the higher shear caused by pouring, the associated network undergoes reversible dissociation, which reduces the apparent viscosity of the composition and forms a continuously flowing filament; after the shearing effect disappears, the hydrophobic groups can reassociate, which helps to maintain the continuity of the filament.

[0027] The compatibility stabilizer described in this invention is used to reduce the tendency for local aggregation between hydrophobic associative cationic polyacrylamide and cationic flexible active ingredients, thereby improving the stability of the composition under high and low temperature storage conditions. The compatibility stabilizer can be selected from one or more of propylene glycol, glycerin, polyethylene glycol 200, polyethylene glycol 300, polyethylene glycol 400, and polyethylene glycol 600. The following examples use propylene glycol as the compatibility stabilizer.

[0028] The acidity regulator described in this invention is used to adjust the pH value of the composition to 2.0–4.0 to maintain an acidic environment and reduce hydrolysis of the ester quaternary ammonium salt during storage. The acidity regulator can be selected from at least one of citric acid and lactic acid. The following examples use citric acid as the acidity regulator.

[0029] The fabric softener composition of the present invention can be prepared by the following method: S1. Take 60% to 70% of the total mass of the fabric softener composition with deionized water, and control the temperature of the deionized water at 20 ℃ to 30 ℃. Slowly add hydrophobic associative cationic polyacrylamide while stirring to avoid the polymer from being added in a concentrated manner and forming clumps that are wet on the outside and dry on the inside. After the addition is completed, continue stirring for 40 min to 60 min until the system is uniform and there are no obvious undispersed particles, and obtain the pre-dispersion of the drawing rheology modifier.

[0030] S2. Heat the remaining deionized water to 40 ℃~50 ℃, add the compatibility stabilizer and acidity regulator in sequence, stir until dissolved, then add the cationic softening active ingredient, and continue stirring for 15 min~25 min to make the cationic softening active ingredient evenly dispersed to obtain the softening base solution.

[0031] S3. Add the pre-dispersed rheology modifier obtained in step S1 to the softening base liquid obtained in step S2 at a uniform rate, and mix for 25 min to 40 min under a stirring intensity lower than that used in step S1, so as to reduce the damage of excessive mechanical shear to the hydrophobic association network and obtain a uniform compound liquid.

[0032] S4. Add one or more of the following to the compound solution according to product requirements: fragrance, preservative and pearlescent agent. Add deionized water to 100% of the total mass of the fabric softener composition. Stir evenly and control the pH value of the composition at 2.0-4.0. Let stand to defoam and obtain a fabric softener composition containing a drawing rheology aid.

[0033] Example 1

[0034] This embodiment provides a household conventional fabric softener composition, comprising the following components in weight percentage: Distearate ethyl dimethyl ammonium chloride 6.0%, hydrophobically associating cationic polyacrylamide 0.15%, propylene glycol 0.5%, citric acid 0.12%, fragrance 0.3%, benzisothiazolinone compound preservative 0.08%, deionized water to 100%.

[0035] In this embodiment, the mass ratio of hydrophobic associative cationic polyacrylamide to distearate dimethylammonium chloride is 1:40.

[0036] Take 65% of the total mass of deionized water, control the temperature at 25 ℃, slowly add hydrophobic associative cationic polyacrylamide while stirring, and continue stirring for 50 min to fully disperse and hydrate it to obtain a pre-dispersion of the rheology modifier for drawing fibers.

[0037] Heat the remaining deionized water to 45 °C, add propylene glycol and citric acid in sequence, stir until dissolved, then add distearyl ethyl ester dimethyl ammonium chloride, and continue stirring for 20 min to obtain the softening base solution.

[0038] The pre-dispersion of the rheology modifier was added to the softening base liquid at a uniform rate. The mixture was stirred for 30 min at a stirring intensity lower than that used in the preparation of the pre-dispersion of the rheology modifier. Then, the fragrance and benzisothiazolinone compound preservative were added, and deionized water was added to 100% of the total mass of the composition. The pH value of the composition was controlled at 2.0-4.0. After stirring evenly, the mixture was allowed to stand to defoam, and sample 1 was obtained.

[0039] Example 2

[0040] This embodiment provides a highly active concentrated fabric softener composition, comprising the following components in weight percentage: Distearate ethyl dimethyl ammonium chloride 18.0%, hydrophobic associative cationic polyacrylamide 0.45%, propylene glycol 1.2%, citric acid 0.35%, fragrance 0.8%, benzisothiazolinone compound preservative 0.15%, deionized water to 100%.

[0041] In this embodiment, the mass ratio of hydrophobic associative cationic polyacrylamide to distearate dimethylammonium chloride is 1:40.

[0042] Take 60% of the total mass of deionized water, control the temperature at 30 ℃, slowly add hydrophobic associative cationic polyacrylamide while stirring, and continue stirring for 60 min to fully disperse and hydrate it to obtain a pre-dispersion of the rheology modifier for drawing fibers.

[0043] Heat the remaining deionized water to 50 °C, add propylene glycol and citric acid in sequence, stir until dissolved, then add distearyl ethyl ester dimethyl ammonium chloride, and continue stirring for 20 min to obtain the softening base solution.

[0044] The pre-dispersion of the rheology modifier was added to the softening base liquid at a uniform rate. The mixture was stirred for 40 min at a stirring intensity lower than that used in the preparation of the pre-dispersion of the rheology modifier. Then, the fragrance and benzisothiazolinone compound preservative were added, and deionized water was added to 100% of the total mass of the composition. The pH value of the composition was controlled at 2.0-4.0. After stirring evenly, the mixture was allowed to stand to defoam, and sample 2 was obtained.

[0045] Example 3

[0046] This embodiment provides a low-activity, refreshing fabric softener composition, comprising the following components in weight percentage: Distearate ethyl dimethyl ammonium chloride 4.0%, hydrophobically associating cationic polyacrylamide 0.10%, propylene glycol 0.3%, citric acid 0.08%, fragrance 0.2%, benzisothiazolinone compound preservative 0.05%, deionized water to 100%.

[0047] In this embodiment, the mass ratio of hydrophobic associative cationic polyacrylamide to distearate dimethylammonium chloride is 1:40.

[0048] Take 70% of the total mass of deionized water, control the temperature at 20 ℃, slowly add hydrophobic associative cationic polyacrylamide while stirring, and continue stirring for 40 min to fully disperse and hydrate it to obtain a pre-dispersion of the rheology modifier for drawing.

[0049] Heat the remaining deionized water to 40 °C, add propylene glycol and citric acid in sequence, stir until dissolved, then add distearate ethyl ester dimethyl ammonium chloride, and continue stirring for 20 min to obtain a softening base solution.

[0050] The pre-dispersion of the rheology modifier was added to the softening base liquid at a uniform rate. The mixture was stirred for 25 min at a stirring intensity lower than that used in the preparation of the pre-dispersion of the rheology modifier. Then, the fragrance and benzisothiazolinone compound preservative were added, and deionized water was added to 100% of the total mass of the composition. The pH value of the composition was controlled at 2.0-4.0. After stirring evenly, the mixture was allowed to stand to defoam, and sample 3 was obtained.

[0051] Comparative Example 1 The components and preparation method of this comparative example are basically the same as those of Example 1, except that hydrophobic associative cationic polyacrylamide is not added, and the amount of deionized water is increased accordingly to keep the total mass of the composition at 100%, thus obtaining comparative sample 1.

[0052] Comparative Example 2 The comparative sample 2 is basically the same as that of Example 1 in terms of composition and preparation method. The difference is that 0.15% of hydrophobic associative cationic polyacrylamide is replaced with an equal mass of hydroxyethyl cellulose, while the content of other components and process conditions remain unchanged.

[0053] Comparative Example 3 This comparative example provides a fabric softener composition in which the amount of rheology modifier added exceeds the limits defined in this invention, comprising the following components in weight percentage: Distearate ethyl dimethyl ammonium chloride 6.0%, hydrophobic associative cationic polyacrylamide 1.5%, propylene glycol 0.5%, citric acid 0.12%, fragrance 0.3%, benzisothiazolinone compound preservative 0.08%, deionized water to 100%.

[0054] The preparation method of Example 1 was followed to obtain Comparative Sample 3.

[0055] Performance testing The samples obtained in Examples 1-3 and Comparative Examples 1-3 were tested for their drawing performance, high-temperature storage stability, low-temperature storage stability, fabric softness, and fabric yellowing performance.

[0056] The method for testing the filament length is as follows: Take 50 g of the sample to be tested, keep it at a constant temperature of 25 ℃, use a container of the same specification to tilt it vertically, and measure the maximum length of the continuous filament before it breaks.

[0057] The high-temperature storage stability test method is as follows: after sealing the sample to be tested, store it in a constant temperature environment of 45 ℃ for 30 days. After the storage period, observe whether the sample has layering, gelation or precipitation.

[0058] The method for low-temperature storage stability testing is as follows: after sealing the sample to be tested, store it in an environment of -5 ℃ for 30 days, take it out and restore it to room temperature, and observe whether the sample has turbidity, layering, gelation or precipitation.

[0059] The fabric softness was tested using a sensory rating method, with a rating range of 1 to 5 points, where 5 points represents the best softness and 1 point represents the worst softness. The evaluation was conducted by 10 evaluators and the average value was taken.

[0060] The method for testing the yellowing performance of fabrics is as follows: white pure cotton fabric is treated with fabric softener, and the treated white pure cotton fabric is placed at room temperature for 90 days. The yellowing index is measured using a colorimeter. The lower the yellowing index, the less yellowing the fabric is.

[0061] The test results are shown in Table 1. .

[0062] Table 1 As shown in Table 1, although Comparative Example 1 did not add a fiber-drawing rheology modifier, the system had certain storage stability and softness properties, but it could not form continuous fibers when poured, indicating that the cationic softening active material itself could not give the composition obvious continuous fiber-drawing properties.

[0063] Comparative Example 2, which used hydroxyethyl cellulose instead of the hydrophobic associative cationic polyacrylamide, showed a fiber length of only 4.1 cm and exhibited stratification or turbidity after high and low temperature storage, with a decrease in the softness score and an increase in the yellowing index. This indicates that although hydroxyethyl cellulose can increase the viscosity of the system, it is difficult to form the same reversible associative network as the hydrophobic associative cationic polyacrylamide described in this invention, and its compatibility with cationic softening agents is relatively poor.

[0064] In Comparative Example 3, the amount of hydrophobic associating cationic polyacrylamide added reached 1.5%, exceeding the addition range specified in this invention, resulting in the formation of a gel in the composition and clumping during high and low temperature storage. This indicates that the amount of hydrophobic associating cationic polyacrylamide added needs to be matched with the content of cationic softening active ingredients.

[0065] In Examples 1-3, the mass ratio of hydrophobic associating cationic polyacrylamide to cationic softening active ingredient was 1:40. The resulting samples had a filament length of 12.5 cm to 16.8 cm, and no obvious stratification, gelation, or precipitation occurred after storage at 45 °C for 30 days and at -5 °C for 30 days. Simultaneously, they maintained a high fabric softness score and a low yellowing index. This demonstrates that, under the component ratios and preparation conditions used in the above examples, hydrophobic associating cationic polyacrylamide can enable fabric softeners to balance continuous filament drawing performance, storage stability, fabric softness, and low yellowing properties.

[0066] In other embodiments, the cationic softening active ingredient may also be bis(octadecyldimethylammonium chloride), amino polyether silicone oil, or imidazoline quaternary ammonium salt, or a combination of two or more cationic softening active ingredients; the compatibility stabilizer may also be glycerin, polyethylene glycol 200, polyethylene glycol 300, polyethylene glycol 400, or polyethylene glycol 600; the acidity regulator may also be lactic acid. Fragrances, preservatives, and pearlescent agents may be selectively added depending on the product form and usage requirements of the fabric softener.

[0067] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A fabric softener composition containing a drawing rheology modifier, characterized in that, It comprises the following components by weight percentage: Cationic softening active ingredient 3.0%–22.0%; Rheology modifier for wire drawing: 0.08%–1.2%; Compatibility stabilizer: 0.1%–2.0%; Acidity regulator 0.05%–0.6%; and Deionized water, replenish to 100%; The rheology modifier is a hydrophobic associative cationic polyacrylamide formed by copolymerization of acrylamide, cationic monomers and hydrophobic monomers. The content of the hydrophobic monomers is 0.5 mol% to 3.0 mol%, and the number of carbon atoms in the hydrophobic chains of the hydrophobic monomers is C8 to C18, based on the total molar number of monomers constituting the hydrophobic associative cationic polyacrylamide. The hydrophobic associative cationic polyacrylamide has a molecular weight of 1.2 million to 6 million and a cationicity of 15% to 40%. The mass ratio of the fabric rheology modifier to the cationic softening active ingredient is 1:25 to 1:180, and the pH value of the fabric softener composition is 2.0 to 4.

0.

2. The fabric softener composition containing a drawing rheology modifier according to claim 1, characterized in that, The cationic monomer is methacryloyloxyethyltrimethylammonium chloride, and the hydrophobic monomer is selected from at least one of N-dodecylacrylamide and octadecyl methacrylate.

3. The fabric softener composition containing a drawing rheology modifier according to claim 1, characterized in that, The critical association concentration of the hydrophobic associating cationic polyacrylamide is 50 mg / L to 300 mg / L; when a steady-state shear rheological test is performed at 25°C, the flow index n of a 1% aqueous solution of the hydrophobic associating cationic polyacrylamide is 0.15 to 0.35 in the range of shear rate from 0.01 s⁻¹ to 1000 s⁻¹.

4. The fabric softener composition containing a drawing rheology modifier according to claim 1, characterized in that, The cationic softening active ingredient is selected from at least one of ester-based quaternary ammonium salts, dioctadecyl dimethyl ammonium chloride, amino polyether silicone oil, and imidazoline quaternary ammonium salts.

5. The fabric softener composition containing a drawing rheology modifier according to claim 4, characterized in that, The cationic compliant active ingredient includes distearylethyl dimethylammonium chloride.

6. The fabric softener composition containing a drawing rheology modifier according to claim 1, characterized in that, The compatibility stabilizer is selected from one or more of propylene glycol, glycerin, polyethylene glycol 200, polyethylene glycol 300, polyethylene glycol 400 and polyethylene glycol 600; the acidity regulator is selected from at least one of citric acid and lactic acid.

7. The fabric softener composition containing a drawing rheology modifier according to claim 1, characterized in that, It also includes auxiliary agents, which are selected from one or more of fragrances, preservatives and pearlescent agents; based on the total mass of the fabric softener composition, the content of the fragrance is 0.01% to 1.5%, the content of the preservative is 0.02% to 0.3%, and the content of the pearlescent agent is 0.1% to 0.8%.

8. A method for preparing a fabric softener composition containing a drawing rheology modifier as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Take 60% to 70% of the total mass of the fabric softener composition of deionized water, control the temperature of the deionized water to 20°C to 30°C, add the drawing rheology agent while stirring, and continue stirring for 40 to 60 minutes to disperse and hydrate the drawing rheology agent to obtain a drawing rheology agent pre-dispersion. S2. Heat the remaining deionized water to 40℃~50℃, add compatibility stabilizer and acidity regulator and stir to dissolve, then add cationic softening active ingredient and continue stirring to obtain softening base solution; S3. Add the pre-dispersed rheology modifier solution to the softening base solution and mix for 25 min to 40 min under stirring conditions lower than the stirring speed used in step S1 to obtain the compound solution. S4. Add or not add auxiliary agents to the compound solution, and add deionized water to 100% of the total mass of the fabric softener composition. Stir evenly and let stand to defoam, to obtain the fabric softener composition containing the drawing rheology auxiliary agent.

9. The method for preparing the fabric softener composition containing a drawing rheology modifier according to claim 8, characterized in that, In step S2, the cationic softening active ingredient is added and stirred for 15 min to 25 min; in step S3, the pre-dispersion of the fiber-drawing rheology modifier is added to the softening base liquid at a uniform rate.