CN111019776A - Liquid soap base added with acrylate copolymer and preparation method thereof - Google Patents

Abstract

A liquid soap base added with acrylate copolymer is prepared from the following raw materials in percentage by weight: 0.3-2.4% of acrylate copolymer, 1-10% of potassium hydroxide, 3-30% of dodecanoic acid, 0-15% of tetradecanoic acid and the balance of water, wherein the total amount of dodecanoic acid and tetradecanoic acid is not more than 30%, and the acrylate copolymer is prepared from the following raw materials in percentage by weight: 1-5% of acrylic acid, 8-12% of methacrylic acid, 7-11% of ethyl acrylate, 5-8% of butyl acrylate, 0.05-0.2% of a cross-linking agent, 0.05-0.2% of an initiator, 1-3% of an emulsifier and the balance of water; the liquid soap base does not form paste and is not layered at low temperature, the stability is high, the stability of the liquid soap base can be ensured by adding the acrylate copolymer, and the irritation of the liquid soap base is effectively reduced.

Description

Liquid soap base added with acrylate copolymer and preparation method thereof

Technical Field

The invention belongs to the technical field of liquid soap bases, and particularly relates to a liquid soap base added with an acrylate copolymer and a preparation method thereof.

Background

The description of the background of the invention pertaining to the technology related to the present invention is intended for purposes of illustration only and is not intended to be an admission that the applicant(s) expressly or unequivocally conceived of the prior art at the filing date of the first-filed application.

The soap base is taken as one of basic raw materials for making soap, and is widely applied to the field of daily necessities such as cosmetics, cleaning products and the like, the soap base can be divided into two types according to the form, namely a liquid soap base and a solid soap base, the existing liquid soap base generally contains fatty acid potassium, in a system with free movement of chemical molecules, the fatty acid potassium is easily contacted with hydrogen ions in the system to form fatty acid, the solubility of the fatty acid is reduced along with the reduction of the solubility of the fatty acid at low temperature, and the fatty acid formed after the fatty acid potassium is combined with the hydrogen ions escapes from the system to generate a layering phenomenon, so that the existing liquid soap base has the defects of poor stability, easy escape of paste at low temperature, layering and the like and difficult stable storage, so the soap base is difficult to be widely popularized and used in the market, and the solid soap base exists in a solid form, the stability of the soap base is ensured, but the main component of the solid soap base is, the solid soap base is required to be stirred strongly, and is converted into heat energy through mechanical energy, and then the heat energy is heated and softened and then extruded and molded to form soap blocks for use, so that when the solid soap base is used for product preparation, energy for softening the solid soap base and the time for injection molding and demolding are required to be increased, and the production cost of the product is increased. The liquid soap-based shower gel is convenient to use, good in cleaning power, rich in foam, easy to wash, moist and comfortable after use, and has excellent use experience of consumers, so that the liquid soap-based shower gel is deeply loved by the consumers.

Disclosure of Invention

In order to overcome the deficiencies of the prior art, it is an object of the present invention to provide a liquid soap base with an acrylate copolymer added thereto.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a liquid soap base added with acrylate copolymer is prepared from the following raw materials in percentage by weight:

0.3-2.4% of acrylate copolymer, wherein the acrylate copolymer has extremely strong suspension capacity, can prevent chemical molecules from freely moving, and reduces the possibility of contact of fatty acid radical ions and hydrogen ions in a system, so that the formation of fatty acid is prevented, the layering of a product is avoided, and the stability of a liquid soap base is improved;

1-10% of potassium hydroxide, which is used for neutralizing fatty acid and acrylate copolymer, so that the fatty acid is converted into potassium fatty acid, the suspension capacity of the acrylate copolymer is realized, the pH value of the liquid soap base is 9.5-11.0, and the liquid soap base is in a slightly alkaline environment;

3-30% of dodecanoic acid, aiming at ensuring that the foam is richer, more stable and finer, the foaming is faster, and the amount of free potassium fatty acid is increased, so that the cleaning power is improved;

0-15% of myristic acid, and aims to make the foam denser, the whiteness better and the product more stable, and increase the thickening capacity of the product in the shower gel;

the lauric acid, the myristic acid and potassium hydroxide are subjected to neutralization reaction to generate potassium laurate and potassium myristate which are anionic surfactants and also serve as main surfactants of high-efficiency cleaning high-grade bath lotion and liquid soap, and can be freely compounded with anionic, nonionic and high polymer cationic surfactants under alkaline conditions, so that bathers feel clean and comfortable all the time;

the balance of water;

the total amount of dodecanoic acid and tetradecanoic acid is not more than 30%;

the acrylate copolymer is prepared from the following raw materials in percentage by weight:

1-5% of acrylic acid;

8-12% of methacrylic acid;

7-11% of ethyl acrylate;

5-8% of butyl acrylate;

0.05 to 0.2 percent of cross-linking agent

0.05-0.2% of an initiator;

1-3% of an emulsifier;

the balance of water;

further, the initiator is potassium persulfate, and the combination and compounding effect of the potassium persulfate and the crosslinking agent enables acrylic acid, methacrylic acid, ethyl acrylate and butyl acrylate to form a lightly crosslinked acrylate copolymer, and enables saturated polyester generated in the copolymerization reaction process to be crosslinked and cured and a high-molecular crosslinking reaction, so that the stability of the acrylate copolymer is improved.

Further, the initiator is particularly preferably potassium persulfate, the ratio of the potassium persulfate to the cross-linking agent is 1:1, and the initiator and the cross-linking agent are compounded in the ratio of 1:1, so that the synergistic interaction effect of the potassium persulfate and the cross-linking agent is remarkable, and the conversion rate of the acrylate copolymer is improved.

Further, the water is deionized water with the conductivity of less than 2 mu s/cm.

Furthermore, the purities of the acrylic acid, the methacrylic acid, the ethyl acrylate, the butyl acrylate and the cross-linking agent are all more than 99%.

Furthermore, the particle size of the acrylic ester copolymer in the microemulsion is 5-100 nm, and the nano-scale micro-particles have a large specific surface area, so that the stability of the acrylic ester copolymer is improved, and the suspension performance of the acrylic ester copolymer is enhanced. Under the action of the acrylate copolymer, the effective components in the liquid soap base can exist uniformly and stably, and the molecular movement in the system is restricted, so that the stability of the liquid soap base is improved.

The invention also aims to provide a preparation method of the liquid soap base, which adopts the technical scheme that the preparation method comprises the following steps:

s1, adding the acrylate copolymer into water, stirring and mixing at normal temperature, and adding potassium hydroxide to form uniform thick transparent liquid;

s2, heating the uniform thick transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding lauric acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, adding myristic acid;

s5, after all the myristic acid is reacted, the solution becomes uniform transparent viscous liquid;

s6, 5 g of the uniform, transparent, viscous liquid obtained in S5 was taken out, and mixed with pure water at a ratio of 1:9 preparing 10% solution, and measuring the pH value;

s7, adjusting the pH value to 9.5-11 by using a potassium hydroxide solution with the concentration of 20%;

and S8, cooling to a normal temperature state to obtain the liquid soap base.

The preparation method of the acrylate copolymer comprises the following steps:

t1, putting half of the initiator into a proper amount of water, mixing, and fully dissolving to obtain a water phase;

t2, mixing acrylic acid, methacrylic acid, ethyl acrylate, butyl acrylate and a cross-linking agent to obtain an oil phase;

t3, putting the emulsifier, the other half of the initiator and the rest water into an emulsification reactor, heating to 80 ℃, slowly pumping the water phase and the oil phase into the emulsification reactor in equal proportion under stirring, stirring and mixing, and carrying out polymerization reaction to form microemulsion;

t4, cooling the microemulsion obtained in T3 to 50 ℃ and filtering to obtain the finished product.

The invention has the beneficial effects that: the liquid soap base does not form paste and is not layered at low temperature, the stability is high, the stability of the liquid soap base can be ensured by adding the acrylate copolymer, and the irritation of the liquid soap base is effectively reduced; in addition, when the liquid soap base is used for preparing the soap base shower gel, the preparation can be directly carried out in a supercooling preparation mode, the steps of heating and dissolving the soap base and the like are not needed, the energy and the time are saved, and the production cost of the soap base shower gel is reduced.

Drawings

The invention is further illustrated by the following figures and embodiments:

FIG. 1 is a schematic illustration of the present invention for preparing a liquid soap base;

FIG. 2 is a schematic diagram of the preparation of an acrylate copolymer according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

The first embodiment is as follows:

the embodiment discloses a liquid soap base added with acrylate copolymer, which is prepared from the following raw materials in percentage by weight:

acrylate copolymer (solid content 30%): 5 percent;

potassium hydroxide: 8.5 percent;

dodecanoic acid: 20 percent;

myristic acid: 4 percent;

the balance is deionized water with the conductivity less than 2 mu s/cm;

the preparation of the liquid soap base comprises the following steps:

s1, adding 5% of acrylate copolymer (with solid content of 30%) into water, stirring and mixing at normal temperature, and adding 8.5% of potassium hydroxide to form uniform thick transparent liquid;

s2, heating the uniform thick transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding 20% dodecanoic acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, adding 4% myristic acid;

s5, after all the myristic acid is reacted, the solution becomes uniform transparent viscous liquid;

s6, taking out 5 g of the uniform transparent viscous liquid obtained in the S5, preparing the uniform transparent viscous liquid and pure water into a 10% solution according to a ratio of 1:9, measuring the pH value, and calculating the amount of the potassium hydroxide solution to be added in the next step of liquid pH value adjustment;

s7, adjusting the pH value to 9.5-11 by using a potassium hydroxide solution with the concentration of 20%;

and S8, cooling to a normal temperature state to obtain the liquid soap base.

The detection results of the liquid soap base obtained in this example are as follows:

the preparation method of the acrylate copolymer comprises the following steps of:

t1, adding 0.05% of initiator into a proper amount of water, mixing, and fully dissolving to obtain a water phase, wherein the initiator is potassium persulfate;

t2, mixing 3% of acrylic acid, 10% of methacrylic acid, 9.5% of ethyl acrylate, 7.8% of butyl acrylate and 0.1% of cross-linking agent to obtain an oil phase;

t3, putting 1% of emulsifier, 0.05% of initiator and the rest water into an emulsion reactor, heating to 80 ℃, slowly and uniformly pumping a water phase and an oil phase into the emulsion reactor in equal proportion, stirring and mixing, carrying out polymerization reaction to generate and form microemulsion, wherein a small amount of slag particles may be generated temporarily in the system during the polymerization and emulsion reaction process, and filtering and removing after the reaction;

t4, cooling the microemulsion to 50 ℃ and filtering to obtain the finished product.

The results of the examination of the acrylate copolymer obtained in this example are as follows:

inspection item	Measured value	Analytical method
			Appearance (25 ℃ C.)	Meets the requirements	Visual inspection of
Smell(s)	Meets the requirements	Normal sense of sight
			pH (10% aqueous solution)	2.75	GB/T6368
Solid content (%)	30.1	QBT1974
			Bacterium (CFU/g)	N.D	GB7918.2
Mold (CFU/g)	N.D	GB7918.2

The water in the microemulsion can be evaporated by heating, the main component of the solid matter existing in an evaporation pan after evaporation is the acrylate copolymer, the solid content of the microemulsion can be calculated by the mass ratio of the solid matter to the microemulsion, the mass of the acrylate copolymer in the microemulsion can be calculated by the solid content of the microemulsion, when the liquid soap base is prepared, the acrylate copolymer can be added by the microemulsion, the microemulsion can be added by the mass conversion of the solid content of the acrylate copolymer, the dehydration and purification steps are not needed, the working flow is simplified, and the corresponding potassium hydroxide and the corresponding fatty acid can also be converted by the mass conversion of the corresponding solution. And the acrylic acid, the methacrylic acid, the ethyl acrylate, the butyl acrylate and the cross-linking agent are subjected to copolymerization reaction under the action of an initiator to form an acrylate copolymer, and the acrylate copolymer is stably existed.

The acrylic acid may be 1%, 1.8%, 2.4%, etc., preferably 3%; methacrylic acid can be 8%, 9.6%, 11.2%, etc., preferably 10%; the ethyl acrylate can be 9%, 9.6%, 10.2% and the like, and is preferably 9.5%; butyl acrylate may amount to 5%, 6.8%, 7.5%, etc., preferably 7.8%; the initiator may be 0.1%, 0.12%, 0.14%, etc., preferably 0.1%; the crosslinking agent may be 0.1%, 0.12%, 0.14%, etc., preferably 0.1%; the emulsifier can be 1.2%, 1.8%, 2.4%, etc., preferably 1%;

the liquid soap base obtained in the embodiment has high transparency and moderate consistency, the excellent suspension performance of the acrylate copolymer is fully exerted in the system, the liquid soap base has high stability, the low temperature resistance and the high temperature resistance are improved, the good suspension performance of the system is ensured, no resource waste is caused, and the good cost control is obtained.

Example two:

the embodiment discloses a liquid soap base added with acrylate copolymer, which is prepared from the following raw materials in percentage by weight:

acrylate copolymer (solid content 30%): 9 percent;

potassium hydroxide: 7.3 percent;

dodecanoic acid: 16 percent;

myristic acid: 5.8 percent;

the balance is deionized water with the conductivity less than 2 mu s/cm;

the preparation of the liquid soap base comprises the following steps:

s1, adding 9% of acrylate copolymer (with solid content of 30%) into water, stirring and mixing at normal temperature, and adding 7.3% of potassium hydroxide to form uniform thick transparent liquid;

s2, heating the uniform thick transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding 16% dodecanoic acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, adding 5.8% myristic acid;

s5, after all the myristic acid is reacted, the solution becomes uniform transparent viscous liquid;

s6, taking out about 5 g of the uniform transparent viscous liquid obtained in the S5, preparing the uniform transparent viscous liquid and pure water into a 10% solution according to a ratio of 1:9, measuring the pH value, and calculating the amount of the potassium hydroxide solution to be added in the next step of adjusting the pH value of the liquid;

s7, adjusting the pH value to 9.5-11 by using 20% potassium hydroxide solution;

and S8, cooling to a normal temperature state to obtain the liquid soap base.

The detection results of the liquid soap base obtained in this example are as follows:

inspection item	Measured value	Analytical method
			Appearance (25 ℃ C.)	Light yellow transparent liquid	Visual inspection of
Smell(s)	Slight raw material taste	Normal sense of sight
			pH (10% aqueous solution)	10.23	GB/T6368
Viscosity (cps)	30000	GB/T6368
			Content wt% of effective substance	19.38	KY-QC-19
Heat resistance test (25 ℃, 48 hours) recovery to room temperature	Transparent and unchanged	Visual inspection of
			Cold resistance test (-20 deg.C, 48 hr) to room temperature	Transparent and unchanged	Visual inspection of
Standing at low temperature (5 ℃, 48 hours)	Transparent and without turbidity	Visual inspection of
			Bacteria CFU/g	N.D	GB7918.2
Mould CFU/g	N.D	GB7918.2

The liquid soap base obtained in the embodiment has high transparency and high consistency, the excellent suspension performance of the acrylate copolymer is fully exerted in the system, and the liquid soap base has high stability, high low temperature resistance and high temperature resistance, rich foam and easy flushing, and is suitable for preparing bath cream with high consistency.

Example three:

the embodiment discloses a liquid soap base added with acrylate copolymer, which is prepared from the following raw materials in percentage by weight:

acrylate copolymer (solid content 30%): 7.3 percent;

potassium hydroxide: 6 percent;

dodecanoic acid: 9 percent;

myristic acid: 6 percent;

the balance is deionized water with the conductivity less than 2 mu s/cm;

the preparation of the liquid soap base comprises the following steps:

s1, adding 7.3% of acrylate copolymer (with solid content of 30%) into water, stirring and mixing at normal temperature, and adding 6% of potassium hydroxide to form uniform thick transparent liquid;

s2, heating the uniform thick transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding 9% dodecanoic acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, adding 6% myristic acid;

s5, after all the myristic acid is reacted, the solution becomes uniform transparent viscous liquid;

s6, about 5 g of the uniform transparent viscous liquid obtained in S5 was taken out, and mixed with pure water at a ratio of 1:9 preparing 10% solution, measuring the pH value, and calculating the amount of potassium hydroxide solution to be added in the next step of adjusting the pH value of the liquid;

s7, adjusting the pH value to 9.5-11 by using 20% potassium hydroxide solution;

and S8, cooling to a normal temperature state to obtain the liquid soap base.

The detection results of the liquid soap base obtained in this example are as follows:

inspection item	Measured value	Analytical method
			Appearance (25 ℃ C.)	Light yellow transparent liquid	Visual inspection of
Smell(s)	Slight raw material taste	Normal sense of sight
			pH (10% aqueous solution)	10.01	GB/T6368
Viscosity (cps)	6100	GB/T6368
			Content wt% of effective substance	20.4	KY-QC-19
Heat resistance test (25 ℃, 48 hours) recovery to room temperature	Transparent and unchanged	Visual inspection of
			Cold resistance test (-20 deg.C, 48 hr) to room temperature	Transparent and unchanged	Visual inspection of
Standing at low temperature (5 ℃, 48 hours)	Transparent and without turbidity	Visual inspection of
			Bacteria CFU/g	N.D	GB7918.2
Mould CFU/g	N.D	GB7918.2

The liquid soap base obtained in the embodiment has high transparency, high consistency, high stability, high low-temperature resistance and high-temperature resistance, fine and rich foam, but the total surfactant content is low, so that the cleaning capability of the liquid soap base is general, and the liquid soap base is suitable for preparing milder shower gel.

Comparative example one:

the formula of the liquid soap base comprises:

5% of potassium hydroxide;

16% of dodecanoic acid;

the balance is deionized water with the conductivity less than 2 mu s/cm;

the method comprises the following steps:

s1, adding 5% potassium hydroxide into water at normal temperature, stirring and mixing to form uniform transparent liquid;

s2, heating the uniform transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding 16% dodecanoic acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, about 5 g of the uniform transparent viscous liquid obtained in S3 was taken out, and mixed with pure water at a ratio of 1:9 preparing 10% solution, and measuring the pH value;

s5, adjusting the pH value to 9.5-11 by using 20% potassium hydroxide solution;

and S6, cooling to a normal temperature state to obtain the liquid soap base.

Comparative example two:

the formula of the liquid soap base comprises:

acrylate copolymer (30% solids content) 1.9%;

5.3 percent of potassium hydroxide;

16% of dodecanoic acid;

the balance is deionized water with the conductivity less than 2 mu s/cm;

the preparation of the liquid soap base comprises the following steps:

s1, adding 1.9% of acrylate copolymer (with solid content of 30%) into water, stirring and mixing at normal temperature, and adding 5.3% of potassium hydroxide to form uniform thick transparent liquid;

s2, heating the uniform thick transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding 16% dodecanoic acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, taking out about 5 g of the transparent viscous liquid obtained in the S3, preparing the transparent viscous liquid and pure water into a 10% solution according to the ratio of 1:9, and measuring the pH value;

s5, adjusting the pH value to 9.5-11 by using 20% potassium hydroxide solution;

and S6, cooling to a normal temperature state to obtain the liquid soap base.

The formula and the method for preparing the acrylate copolymer in the comparative example are the same as those in the first example.

Comparative example three:

the formula of the liquid soap base comprises:

acrylate copolymer (solid content 30%): 4 percent;

potassium hydroxide: 10 percent;

dodecanoic acid: 30 percent;

the balance is deionized water with the conductivity less than 2 mu s/cm;

the preparation of the liquid soap base comprises the following steps:

s1, adding 4% of acrylate copolymer (with solid content of 30%) into water, stirring and mixing at normal temperature, and adding 10% of potassium hydroxide to form uniform thick transparent liquid;

s2, heating the uniform thick transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding 30% dodecanoic acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, taking out about 5 g of the uniform transparent viscous liquid obtained in the S3, preparing the uniform transparent viscous liquid and pure water into a 10% solution according to the ratio of 1:9, and measuring the pH value;

s5, adjusting the pH value to 9.5-11 by using 20% potassium hydroxide solution;

and S6, cooling to a normal temperature state to obtain the liquid soap base.

The formula and the method for preparing the acrylate copolymer in the comparative example are the same as those in the first example.

The liquid soap bases obtained in the three examples and the three comparative examples are subjected to stability comparative analysis, and since the liquid soap bases of the invention are transparent liquid soap bases, the stability analysis can obtain results through visual sense, the six groups of liquid soap bases obtained are placed in eight different temperature environments of-20 ℃, 10 ℃, 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃ and 50 ℃, the testing time is 3 months, and the testing method is as follows: placing six groups of liquid soap bases in the eight different temperature environments, preserving at constant temperature for 3 months, taking out and recovering to room temperature, observing whether the liquid soap bases are transparent or not, and whether soap grains are separated out or not, layering, separating, fouling and the like, wherein the test results are shown in the following table:

stability test results

Example one

Example two

EXAMPLE III

Comparative example 1

Comparative example No. two

Comparative example No. three

-20℃

Is normal

Is normal

Is normal

Layering

Layering

Is normal

-10℃

Is normal

Is normal

Is normal

Layering

Layering

Is normal

0℃

Is normal

Is normal

Is normal

Soap grain separation

Soap grain separation

Is normal

10℃

Is normal

Is normal

Is normal

Soap grain separation

Soap grain separation

Is normal

20℃

Is normal

Is normal

Is normal

Is normal

Is normal

Is normal

30℃

Is normal

Is normal

Is normal

Is normal

Is normal

Is normal

40℃

Is normal

Is normal

Is normal

Layering

Is normal

Is normal

50℃

Is normal

Is normal

Is normal

Layering

Is normal

Is normal

According to the results of the examples and the comparative examples, the effect of the acrylate copolymer in the liquid soap base is shown, in the first to third examples, the acrylate copolymer in a reasonable proportion range is added, the stability of the formed liquid soap base is high, the acrylate copolymer has an excellent suspension effect on a system in a slightly alkaline environment, and has a binding effect on the activities of chemical molecules and ions in the liquid soap base, so that soap grain separation or layering formed by the interaction and combination of the chemical molecules and the ions is avoided, meanwhile, the ultralow particle size distribution of the acrylate copolymer in the liquid soap base is generally about 5-100 nm, the surface area of the particles is huge, and the stability of the product is improved; in the first comparative example, no acrylate copolymer is added, so that the stability is poor, soap grain separation and layering are easily formed in low-temperature and high-temperature environments, and the popularization and application are difficult; in the comparative example II, the added acrylate copolymer is lower than the reasonable proportion amount, soap grain separation and delamination can be formed at low temperature (below 10 ℃), and in the comparative example III, the soap grain separation and delamination phenomena do not occur in a reasonable range. The higher acrylate copolymer or higher dodecanoic acid content is not exemplified in the comparative examples because if either content is too high, it results in a system that is too thick to stir effectively and to allow the formulation of a liquid soap base.

The above description is only a preferred embodiment of the present invention, and the technical solutions that achieve the objects of the present invention by substantially the same means are within the protection scope of the present invention.

Claims (4)

1. A liquid soap base added with acrylate copolymer is characterized in that,

the liquid soap base is prepared from the following raw materials in percentage by weight:

0.3-2.4% of acrylate copolymer;

1-10% of potassium hydroxide;

3-30% of dodecanoic acid;

0-15% of myristic acid;

the balance of water;

the total amount of dodecanoic acid and tetradecanoic acid is not more than 30%;

the acrylate copolymer is prepared from the following raw materials in percentage by weight:

1-5% of acrylic acid;

8-12% of methacrylic acid;

7-11% of ethyl acrylate;

5-8% of butyl acrylate;

0.05-0.2% of a cross-linking agent;

0.05-0.2% of an initiator;

1-3% of an emulsifier;

the balance being water.

2. The liquid soap base added with the acrylate copolymer as claimed in claim 1, wherein the pH value of the liquid soap base is 9.5-11.0.

3. A process for the preparation of a liquid soap base according to any one of claims 1 to 2, characterised in that it comprises the following steps:

s1, adding the acrylate copolymer into water, stirring and mixing at normal temperature, and adding potassium hydroxide to form uniform thick transparent liquid;

s2, heating the uniform thick transparent liquid in the S1 to 80 ℃, preserving heat for 30-40 minutes, adding lauric acid, and stirring and mixing;

s3, after all the dodecanoic acid is reacted, the solution becomes uniform transparent viscous liquid;

s4, adding myristic acid;

s5, after all the myristic acid is reacted, the solution becomes uniform transparent viscous liquid;

s6, 5 g of the uniform, transparent, viscous liquid obtained in S5 was taken out, and mixed with pure water at a ratio of 1:9 preparing 10% solution, and measuring the pH value;

s7, adjusting the pH value to 9.5-11 by using a potassium hydroxide solution with the concentration of 20%;

and S8, cooling to a normal temperature state to obtain the liquid soap base.

4. The method of claim 3, wherein the acrylate copolymer is prepared by the steps of:

t1, putting half of the initiator into a proper amount of water, mixing, and fully dissolving to obtain a water phase;

t2, mixing acrylic acid, methacrylic acid, ethyl acrylate, butyl acrylate and a cross-linking agent to obtain an oil phase;

t3, putting the emulsifier, the other half of the initiator and the rest water into an emulsification reactor, heating to 80 ℃, slowly pumping the water phase and the oil phase into the emulsification reactor in equal proportion under stirring, stirring and mixing, and carrying out polymerization reaction to form microemulsion;

t4, cooling the microemulsion obtained in T3 to 50 ℃ and filtering to obtain the finished product.

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