Preparation method of pea starch-based transparent soap

Abstract

The invention belongs to the technical field of perfumed soap preparation, and relates to a preparation method of pea starch-based transparent perfumed soap, which comprises the following steps: firstly, taking 19-20 parts by weight of pea starch and 80-90 parts by weight of water to prepare transparent starch milk; cooling the starch milk to 70-80 DEG C, adding 10-15 parts of coconut oil, 15-20 parts of beef tallow and 10-20 parts of sodium hydroxide, and stirring at constant temperature for 4-6 hours to finish emulsification; then adding glycerol, 5-10 parts of rock candy and 4-6 parts of propolis, uniformly mixing, injecting into a mold, freezing and molding, and demolding; and finally, cooling the soap block in a ventilated environment with the temperature of 25 DEG C and the humidity of 40%, controlling the water loss rate to be about 1.15% / day, and drying until the total water loss rate is about 12% to obtain a finished product. According to the invention, a stable starch oil gel system is constructed by utilizing the characteristic of high amylose content of pea starch, so that the problems of insufficient transparency, poor elasticity and poor stability of the existing starch-based transparent soap are solved.

Description

Technical Field

[0001] This invention belongs to the field of soap preparation technology, and relates to a method for preparing a transparent soap based on pea starch. Background Technology

[0002] Transparent soaps, with their rich colors, ease of shaping, dense lather, and low skin irritation, along with excellent overall cleansing power—cleansing the skin without excessively stripping it of its natural sebum—and the potential to incorporate various moisturizing ingredients, have become a popular high-end cleansing product. As consumers increasingly demand natural, gentle, and high-quality daily chemical products, developing transparent soaps based on natural ingredients has become an industry trend.

[0003] Starch, as a natural and renewable raw material, is widely used in daily chemicals, food, and pharmaceuticals. Currently, some starch-based transparent soaps are available on the market, but most use grain starch or potato starch as raw materials, resulting in insufficient transparency, poor elasticity, and suboptimal structural stability. This is mainly because grain starch and potato starch have low amylose content, making it difficult to balance transparency and stability in the gelatinized system, thus limiting the development of high-end products.

[0004] Pea starch, a major component of peas (up to 50%), possesses natural advantages such as a pure white appearance and delicate texture. Compared to traditional grain and tuber starches, pea starch has a significantly higher amylose content, resulting in a highly transparent and elastic system after gelatinization, providing an ideal raw material for preparing high-quality transparent soaps. However, currently, there is no technical solution to utilize this characteristic of pea starch to prepare transparent soaps by constructing a stable starch oleogluon system. Therefore, there is an urgent need to develop a method for preparing transparent soaps based on pea starch to overcome the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems and provide a method for preparing a transparent soap based on pea starch.

[0006] To achieve the above objectives, the present invention provides a method for preparing a transparent soap based on pea starch. S1, Preparation of starch milk: Take 19-20 parts by weight of pea starch and 80-90 parts by weight of water, stir the cold water evenly and then heat it, and continue stirring until the system becomes transparent to obtain pea starch milk. S2. Emulsification treatment: Cool the pea starch milk to 70-80℃, add 10-15 parts coconut oil, 15-20 parts butter and 10-20 parts sodium hydroxide, and keep at this temperature and stir continuously for 4-6 hours until emulsification is complete to obtain emulsified soap solution. S3. Preparation and molding: Stir the emulsified soap solution, add glycerin, then add 5-10 parts rock sugar and 4-6 parts propolis. Stir well and pour into the mold. Freeze and cool to set before demolding. S4. Soap drying process: Remove the uneven parts of the soap block and cut it to the preset thickness. Place it in a dry room with a temperature of 25℃, humidity of 40%, and good ventilation to dry. Control the water loss rate to 1.15% / day and dry until the total water loss rate is 12% to obtain pea starch-based transparent soap.

[0007] Furthermore, in step S1, the heating temperature is 90-100℃ and the stirring rate is 150-200 r / min.

[0008] Furthermore, the stirring rate in step S2 is 200-250 r / min.

[0009] Furthermore, in step S3, the amount of glycerol added is 5-8 parts, the freezing and cooling temperature is 0-5℃, and the cooling time is 4-6 hours.

[0010] Furthermore, in step S4, the preset thickness of the soap block is 1.5-2cm.

[0011] The beneficial effects of this invention are as follows: This invention uses pea starch as the core raw material, taking advantage of its high amylose content and fine texture. After gelatinization, the starch and oil form a stable starch oleogel system through emulsification. After gelatinization and cooling, the system has significantly better transparency than traditional cereal starch and potato starch-based systems. The prepared soap has high transparency and good elasticity, solving the technical pain point of insufficient transparency in existing starch-based transparent soaps.

[0012] This invention ensures stable system formation, dense product structure, and excellent overall performance by precisely controlling the process parameters of each step, especially the heating and stirring conditions, emulsification temperature and time, and temperature, humidity, and water loss rate during the cooling process of starch milk preparation. This is achieved through precise control of process parameters, particularly the heating and stirring conditions, emulsification temperature and time, and cooling process temperature, humidity, and water loss rate. Simultaneously, the added coconut oil and butter provide gentle cleansing and moisturizing effects. Combined with ingredients such as glycerin, rock sugar, and propolis, this further enhances the moisturizing and gentle properties of the soap, resulting in low skin irritation and the ability to retain the skin's natural sebum after cleansing, meeting the requirements of high-end daily chemical products.

[0013] The raw materials for this invention are readily available. Pea starch is widely available and inexpensive. The preparation process is simple and controllable, requiring no complex equipment. It is suitable for large-scale industrial production and has significant economic value and market application prospects. Detailed Implementation

[0014] The preparation method of the pea starch-based transparent soap of the present invention will be described below through specific embodiments: Example 1: A method for preparing a pea starch-based transparent soap includes the following steps: S1. Preparation of starch milk: Take 19 parts of pea starch and 85 parts of water, place them in a mixing tank, stir at 180 r / min for 10 min under cold water conditions until uniformly dispersed, then heat to 95℃, maintain this temperature and stir continuously at 180 r / min for 20 min until the system becomes transparent, and obtain pea starch milk.

[0015] S2. Emulsification treatment: Cool the pea starch milk naturally to 75°C, then add 12 parts coconut oil, 18 parts butter and 15 parts sodium hydroxide in sequence, and stir continuously at 220 r / min for 5 hours until the system is free of stratification, has a uniform texture and is completely emulsified to obtain emulsified soap solution.

[0016] S3. Preparation and Shaping: While keeping the emulsified soap liquid stirred, add 6 parts glycerin, then add 8 parts rock sugar and 5 parts propolis, and continue stirring for 15 minutes until evenly mixed; pour the finished soap liquid into a rectangular mold, place it in a 0-5℃ environment to cool for 5 hours until fully formed, and then unmold and remove the soap block.

[0017] S4. Soap Cooling Process: Remove the uneven parts of the soap block surface and cut it into uniform soap blocks with a thickness of 1.8cm; place the soap blocks in a dry room with a temperature of 25℃, humidity of 40%, and good ventilation, and control the water loss rate to 1.15% / day for 10 days. At this time, the total water loss rate of the soap blocks is 11.8%, and the soap cooling process is completed, resulting in pea starch-based transparent soap. Example 2:

[0018] A method for preparing a pea starch-based transparent soap includes the following steps: Preparation of starch milk: Take 20 parts of pea starch and 80 parts of water, place them in a mixing tank, stir at 150 r / min for 15 min under cold water conditions until uniformly dispersed, then heat to 90℃, maintain this temperature and stir continuously at 150 r / min for 25 min until the system becomes transparent, and obtain pea starch milk.

[0019] Emulsification: Cool the pea starch milk naturally to 70°C, then add 10 parts coconut oil, 15 parts butter, and 10 parts sodium hydroxide in sequence. Stir continuously at 200 r / min for 6 hours until the system is completely emulsified to obtain emulsified soap solution.

[0020] Preparation and Shaping: While keeping the emulsified soap solution stirred, add 5 parts glycerin, then add 5 parts rock sugar and 4 parts propolis, and continue stirring for 20 minutes until evenly mixed; pour the finished soap solution into a round mold, place it in an environment of 0-5℃ to cool for 4 hours until fully formed, then unmold and remove the soap block.

[0021] Soap cooling process: Remove the uneven parts of the soap block surface and cut it into uniform soap blocks with a thickness of 1.5cm; place the soap blocks in a dry room with a temperature of 25℃, humidity of 40% and good ventilation, and control the water loss rate to 1.15% / day for 10 days. At this time, the total water loss rate of the soap block is 12.1%, and the soap cooling process is completed, resulting in pea starch-based transparent soap. Example 3:

[0022] A method for preparing a pea starch-based transparent soap includes the following steps: Preparation of starch milk: Take 20 parts of pea starch and 90 parts of water, place them in a mixing tank, stir at 200 r / min for 8 min under cold water conditions until uniformly dispersed, then heat to 100℃, maintain this temperature and stir continuously at 200 r / min for 18 min until the system becomes transparent, and obtain pea starch milk.

[0023] Emulsification: Cool the pea starch milk naturally to 80°C, then add 15 parts coconut oil, 20 parts butter and 20 parts sodium hydroxide in sequence, and stir continuously at 250 r / min for 4 hours until the system is completely emulsified to obtain emulsified soap solution.

[0024] Preparation and Shaping: While keeping the emulsified soap solution stirred, add 8 parts glycerin, then add 10 parts rock sugar and 6 parts propolis, and continue stirring for 12 minutes until evenly mixed; pour the finished soap solution into a shaped mold, place it in an environment of 0-5℃ to cool for 6 hours until fully formed, and then unmold and remove the soap block.

[0025] Soap cooling process: Remove the uneven parts of the soap block surface and cut it into uniform soap blocks with a thickness of 2.0cm; place the soap blocks in a dry room with a temperature of 25℃, humidity of 40% and good ventilation, and control the water loss rate to 1.15% / day for 10 days. At this time, the total water loss rate of the soap blocks is 11.9%, and the soap cooling process is completed, resulting in pea starch-based transparent soap.

[0026] Comparative Example 1 (using corn starch instead of pea starch) A method for preparing a corn starch-based transparent soap includes the following steps: Preparation of starch milk: Take 19 parts corn starch and 85 parts water, place them in a mixing tank, stir at 180 r / min for 10 min under cold water conditions until uniformly dispersed, then heat to 95℃, maintain this temperature and stir continuously at 180 r / min for 20 min to obtain corn starch milk (the system is semi-transparent and turbid).

[0027] Emulsification: The corn starch milk was naturally cooled to 75°C, and 12 parts coconut oil, 18 parts butter and 15 parts sodium hydroxide were added in sequence. The mixture was stirred continuously at 220 r / min for 5 hours to obtain emulsified soap solution.

[0028] Preparation and Shaping: While keeping the emulsified soap liquid stirred, add 6 parts glycerin, then add 8 parts rock sugar and 5 parts propolis, and continue stirring for 15 minutes until evenly mixed; pour the finished soap liquid into a rectangular mold, place it in a 0-5℃ environment to cool for 5 hours until fully formed, then unmold and remove the soap block.

[0029] Soap drying process: Remove the uneven parts of the soap block surface and cut it into uniform soap blocks with a thickness of 1.8cm; place the soap blocks in a dry room with a temperature of 25℃, humidity of 40% and good ventilation, control the water loss rate to 1.15% / day, and dry for 10 days to obtain corn starch-based transparent soap.

[0030] Comparative Example 2 (using sweet potato starch instead of pea starch) A method for preparing a sweet potato starch-based transparent soap includes the following steps: Preparation of starch milk: Take 19 parts of sweet potato starch and 85 parts of water, place them in a mixing tank, stir at 180 r / min for 10 min under cold water conditions until uniformly dispersed, then heat to 95℃, maintain this temperature and stir continuously at 180 r / min for 20 min to obtain sweet potato starch milk (the system is slightly transparent milky white).

[0031] Emulsification: The sweet potato starch milk was naturally cooled to 75°C, and 12 parts coconut oil, 18 parts butter and 15 parts sodium hydroxide were added in sequence. The mixture was stirred continuously at 220 r / min for 5 hours to obtain emulsified soap solution.

[0032] Preparation and Shaping: While keeping the emulsified soap liquid stirred, add 6 parts glycerin, then add 8 parts rock sugar and 5 parts propolis, and continue stirring for 15 minutes until evenly mixed; pour the finished soap liquid into a rectangular mold, place it in a 0-5℃ environment to cool for 5 hours until fully formed, then unmold and remove the soap block.

[0033] Soap drying process: Remove the uneven parts of the soap block surface and cut it into uniform soap blocks with a thickness of 1.8cm; place the soap blocks in a dry room with a temperature of 25℃, humidity of 40% and good ventilation, control the water loss rate to 1.15% / day, and dry for 10 days to obtain sweet potato starch-based transparent soap.

[0034] Performance Testing and Results Analysis The soaps prepared in Examples 1-3 and Comparative Examples 1-2 were tested for three core properties: transparency, elasticity, and stability. The test methods and results are as follows: Transparency test: The transmittance of the soap at a wavelength of 550nm was measured using a spectrophotometer. The higher the transmittance, the better the transparency.

[0035] Elasticity test: The compression rebound rate of the soap is determined using a texture analyzer. The soap bar is compressed to 50% of its original thickness and then released. The rebound rate is calculated. The higher the rebound rate, the better the elasticity.

[0036] Stability test: Place the soap bar in an environment with a temperature of 30℃ and a humidity of 60% for 30 days and observe whether the soap bar cracks, deforms, or separates.

[0037] Results analysis: The pea starch-based transparent soaps prepared in Examples 1-3 all had a light transmittance of over 90%, a rebound rate of over 87%, and excellent long-term storage stability; while in Comparative Examples 1-2, after replacing pea starch with corn starch and sweet potato starch, the light transmittance of the soaps was only 65%-69%, the rebound rate was less than 66%, and problems such as cracking and deformation occurred after storage.

[0038] The above description is merely one embodiment of the present invention and is not intended to limit the invention. Those skilled in the art will recognize that the present invention can have various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a pea starch-based transparent soap, characterized in that, include: S1. Preparation of starch milk: Take 19-20 parts by weight of pea starch and 80-90 parts by weight of water, stir the mixture with cold water until it is evenly mixed, then heat it and continue stirring until the system becomes transparent to obtain pea starch milk. S2. Emulsification treatment: Cool the pea starch milk to 70-80℃, add 10-15 parts coconut oil, 15-20 parts butter and 10-20 parts sodium hydroxide, and keep at this temperature and stir continuously for 4-6 hours until emulsification is complete to obtain emulsified soap solution. S3. Preparation and molding: Stir the emulsified soap solution, add glycerin, then add 5-10 parts rock sugar and 4-6 parts propolis. Stir well and pour into the mold. Freeze and cool to set before demolding. S4. Soap drying process: Remove the uneven parts of the soap block and cut it to the preset thickness. Place it in a dry room with a temperature of 25℃, humidity of 40%, and good ventilation to dry. Control the water loss rate to 1.15% / day and dry until the total water loss rate is 12% to obtain pea starch-based transparent soap.

2. The preparation method according to claim 1, characterized in that, In step S1, the heating temperature is 90-100℃ and the stirring rate is 150-200r / min.

3. The preparation method according to claim 1, characterized in that, The stirring rate in step S2 is 200-250 r / min.

4. The preparation method according to claim 1, characterized in that, In step S3, the amount of glycerol added is 5-8 parts, the freezing and cooling temperature is 0-5℃, and the cooling time is 4-6 hours.

5. The preparation method according to claim 1, characterized in that, In step S4, the preset thickness of the soap block is 1.5-2cm.

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