CN111257155B - Method for detecting moisture absorption performance of printing auxiliary agent under steaming condition - Google Patents
Method for detecting moisture absorption performance of printing auxiliary agent under steaming condition Download PDFInfo
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
Abstract
The invention discloses a method for detecting the moisture absorption performance of a printing auxiliary agent under a steaming condition, which comprises the following steps: preparing sodium alginate raw paste containing a printing auxiliary agent; (2) Respectively pouring the prepared pure sodium alginate raw paste and the sodium alginate raw paste containing the printing auxiliary agent into a flat-bottomed container, leveling the flat-bottomed container to fill the bottom of the container, and drying the flat-bottomed container to form a film until the thickness of the flat-bottomed container is uniform and consistent, thereby obtaining a dry film; (3) Putting the container and the dry film into a steaming machine for steaming, and weighing to obtain the total mass of the container and the wet film; (4) calculating to obtain the moisture absorption rate; (5) And (5) repeating the steps (2) to (4) for multiple times to obtain multiple moisture absorption rate data, controlling the dispersion coefficient of the moisture absorption rate within 10%, obtaining the average value of the moisture absorption rate, and obtaining the moisture absorption performance of the printing auxiliary agent under the steaming condition. The method quantitatively evaluates the moisture absorption performance of the printing auxiliary agent, is simple and easy to implement, and can accurately reflect the moisture absorption performance of the printing auxiliary agent under the steaming condition.
Description
Technical Field
The invention belongs to the field of a performance test method of a printing auxiliary agent, and particularly relates to a method for detecting the moisture absorption performance of the printing auxiliary agent under a steaming condition.
Background
The reactive dye printing has the characteristics of bright color, good color fastness, soft hand feeling and the like, so that the reactive dye printing occupies higher proportion in the whole dye printing. In the printing process, the patterned size film dried on the surface of the fabric needs to be subjected to a steaming process, so that the coloring of the fiber by the reactive dye can be realized. Under steaming conditions, the reactive dye requires sufficient water to redissolve in water to successfully complete adsorption, diffusion and dye-uptake fixation of the fiber. It follows that steaming to absorb moisture is the first step in achieving smooth coloring of the fibers by the reactive dye in the size film. Reactive printing requires a substance with a moisture absorption function to capture moisture in the surrounding environment through polar groups in the structure, so that the size film can fully absorb water and provide a dissolved medium for dyes. The paste in the size film is usually a high molecular substance containing a large amount of polar groups, has strong moisture absorption performance, but is easy to absorb moisture, and the provided free water is not enough to fully redissolve the reactive dye. Therefore, the active printing paste needs to be added with an auxiliary agent with moisture absorption performance so as to quickly capture water molecules and provide a medium which is sufficiently dissolved for the dye, so that the printed fabric can obtain excellent surface coloring and color fixing.
However, there is currently no quantitative uniform standard for judging the moisture absorption properties of printing aids under steaming conditions. Generally, the moisture absorption of the auxiliary agent can be analyzed through a moisture absorption equilibrium diagram of the auxiliary agent, but the method can only analyze the moisture absorption performance of the auxiliary agent per se and cannot faithfully reflect the moisture absorption effect exerted by the auxiliary agent in the printing steaming process. A method for detecting the moisture absorption performance of the printing auxiliary agent under the steaming condition is not reported at home and abroad.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for detecting the moisture absorption performance of a printing auxiliary agent under a steaming condition, wherein the moisture absorption performance of the auxiliary agent in the steaming process is judged by controlling the dispersion coefficient of the moisture absorption rate within 10% through the quality of a sodium alginate wet film containing the printing auxiliary agent and the quality of a pure sodium alginate wet film and calculating the average value of the moisture absorption rate. The method is simple and convenient to operate, has accurate results, and can accurately judge the moisture absorption performance of the printing auxiliary agent under the steaming condition.
A method for detecting the moisture absorption performance of a printing auxiliary agent under steaming conditions comprises the following steps:
(1) Adding a printing auxiliary agent into the sodium alginate raw paste to prepare the sodium alginate raw paste containing the printing auxiliary agent;
(2) Respectively pouring the prepared pure sodium alginate raw paste and the sodium alginate raw paste containing the printing auxiliary agent into a flat-bottom container, so that the flat-bottom container is filled with the prepared pure sodium alginate raw paste and the sodium alginate raw paste containing the printing auxiliary agent in a leveling manner, the thickness of the flat-bottom container is uniform and consistent, and then drying the flat-bottom container to form a film to constant weight, thereby obtaining a dry film;
(3) Putting the container and the dry film into a steaming machine for steaming, and weighing to obtain the total mass of the container and the wet film;
(4) Calculating to obtain the moisture absorption rate;
(5) And (5) repeating the steps (2) to (4) for multiple times to obtain multiple moisture absorption rate data, controlling the dispersion coefficient of the moisture absorption rate within 10%, and obtaining the average value of the moisture absorption rate so as to judge the moisture absorption performance of the printing auxiliary agent under the steaming condition.
In the step (1), when preparing the sodium alginate raw paste containing the printing auxiliary agent, the printing auxiliary agent is added into the sodium alginate raw paste, the mixture is stirred uniformly, and the mixture is kept standing at room temperature for defoaming to prepare the sodium alginate raw paste containing the printing auxiliary agent.
Sodium alginate is the most commonly used thickener for printing by reactive dyes at home and abroad at present, so the sodium alginate thickener is selected as a carrier to prepare size films containing different printing aids, the moisture absorption performance of the printing aids with different structures in the sodium alginate size films is discussed, if other kinds of thickeners are selected, the moisture absorption result of the additives is possibly unstable, and the analysis of printing size mixing by taking sodium alginate as raw paste is not facilitated, so that the relation between the moisture absorption performance of the additives and the printing performance is explored.
Preferably, the apparent viscosity of the raw sodium alginate paste in the step (1) is 8000 to 12000 mPas as measured with a rotational viscometer with a number 4 spindle 30 r/min. If the viscosity of the sodium alginate is lower than 8000mPa & s, the viscosity of the sodium alginate is too low, and the prepared film containing the printing auxiliary agent is easy to become fragile and influences the stability of experimental data; if the viscosity of the sodium alginate is higher than 12000mPa.s, the viscosity of the prepared film containing the printing auxiliary agent is higher, and the film is not easy to level; the too low and too high viscosity of the sodium alginate raw paste is not in accordance with the viscosity of the color paste in the printing color paste, which is not beneficial to analyzing the relation between the moisture absorption auxiliary agent in the color paste and the printing performance.
Preferably, in the step (1), the mass fraction of the printing auxiliary agent in the raw paste is 1-20%. The content of the auxiliary agent in the reactive printing paste is generally 1-20 wt%, and too much or too little will have adverse effect on the printing performance.
Preferably, in the step (2), the vessel is a petri dish, and the diameter of the petri dish is 60 to 80mm. The culture dish with proper size is selected, so that the consistency of the size of the film can be kept in the drying and film-forming process of the sodium alginate raw paste containing the auxiliary agent, and the film can be easily cracked due to the addition of some auxiliary agents, and a complete film can not be obtained, so that the culture dish with proper size is selected as the culture dish.
Preferably, the amount of the raw paste of sodium alginate added in the step (2) is 5 to 10g. When the fabric is steamed, the size film on the surface of the fabric is very thin, the adding amount of the original paste in a culture dish with a certain size is moderate in order to be close to the thickness of the printed size film, if the amount of the original paste is too small, the original paste cannot fill the culture dish, the obtained film is not uniform, and the accuracy of data is influenced; if the original paste amount is too large, the thickness of the film is larger and is not close to the thickness of a sizing film on the fabric, so that the stability of data is influenced.
Preferably, the drying temperature in the step (2) is 80-100 ℃. If the drying temperature is lower, the experiment time is longer and the efficiency is low; if the drying temperature is higher, the film is easy to crack, the drying temperature is 80-100 ℃, and the drying temperature is closer to the drying temperature after the color paste is printed on the fabric in the actual production process.
As a preferable scheme, the steaming temperature in the step (3) is 101-104 ℃, and the steaming time is 30-60 min. The steaming time is too short, so that the moisture absorption performance of the auxiliary agent cannot be fully exerted, and the correctness of data is influenced; the steaming time is too long, the auxiliary agent achieves the maximum moisture absorption, the experimental efficiency is influenced, and the color-obtaining performance of the printed fabric is also negatively influenced.
In the step (4), the moisture absorption rate is calculated through the total mass of the sodium alginate wet film containing the printing auxiliary agent and the container and the total mass of the pure sodium alginate wet film and the container; the calculation formula of the moisture absorption rate in the step (4) is as follows:
in the formula: r is moisture absorption rate,%; m 1 The total mass g of the pure sodium alginate wet film and the container after drying and steaming treatment; m 2 The total mass g of the sodium alginate wet film containing the printing auxiliary agent and the container after drying and steaming treatment.
The calculation formula of the dispersion coefficient of the moisture absorption rate in the step (5) is as follows:
in the formula: CV is the coefficient of variation,%, of the moisture absorption rate; r is i In order to repeat the moisture absorption rate of the ith time,
the average moisture absorption rate was obtained by repeating the above steps n times.
And when the initially obtained moisture absorption rate data does not meet the requirement of the discrete coefficient, removing the data which do not meet the requirement, simultaneously repeatedly detecting, and supplementing missing data until all the data meet the requirement of the discrete coefficient.
Average moisture absorption rate in the step (5)
The higher the moisture absorption of the printing aid under steaming conditions.
Compared with the prior art, the invention has the following beneficial effects:
(1) The detection method of the invention quantifies the moisture absorption performance of the printing auxiliary under the steaming condition, and can truly reflect the moisture absorption performance of the auxiliary exerted in the film steaming process.
(2) The method is simple and convenient, has accurate results, and provides reliable judgment basis for researching the moisture absorption performance of the printing auxiliary agent in the steaming process.
(3) By utilizing the method, the moisture absorption performance of different auxiliaries under the same condition and the steaming condition can be known; the moisture absorption performance of the same auxiliary agent under different steaming conditions can be known; provides more comprehensive theoretical basis for the selection of the auxiliary agent.
(4) By utilizing the method, the moisture absorption performance of the conventional auxiliary agent under the steaming condition can be systematically detected, and meanwhile, the research on the moisture absorption performance of the auxiliary agent with a similar structure can be utilized to purposefully develop the auxiliary agent with better or more appropriate moisture absorption performance, so that the method provides greater possibility for the development of a new auxiliary agent.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
(1) 100g of sodium alginate raw paste with the viscosity of 10000 mPas is taken, 5g of urea, glycerol, triethylene glycol, caprolactam and acetamide are respectively added, the mixture is uniformly stirred and stands at room temperature for defoaming, and the sodium alginate raw paste containing 5wt% of urea, glycerol, triethylene glycol, caprolactam and acetamide is respectively prepared.
(2) 7g of pure sodium alginate raw paste and sodium alginate raw paste containing a printing aid (5 wt% of urea, glycerol, triethylene glycol, caprolactam and acetamide) are respectively poured into a plurality of culture dishes of 70mm to enable the pure sodium alginate raw paste and the sodium alginate raw paste to be leveled and fill the bottom of the culture dishes, the thicknesses of the pure sodium alginate raw paste and the sodium alginate raw paste are uniform, the pure sodium alginate raw paste and the sodium alginate raw paste are dried at 90 ℃ to form a film until the film is constant in weight, and pure sodium alginate dry films and sodium alginate dry films containing the printing aid which are contained in the corresponding culture dishes are respectively obtained.
(3) And (3) steaming the culture dish and the dry film in a steamer at 102 ℃ for 40min respectively, and weighing to obtain the total mass of the pure sodium alginate wet film and the culture dish and the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish respectively.
(4) The moisture absorption rate is obtained by calculating the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish and the total mass of the pure sodium alginate wet film and the culture dish, and the calculation formula is as follows:
in the formula: r is moisture absorption rate,%; m is a group of 1 The total mass g of the pure sodium alginate wet film and the culture dish after drying and steaming treatment; m is a group of 2 Is the total mass of a sodium alginate wet film containing printing auxiliary agents and a culture dish after drying and steaming treatmentAmount, g.
(5) Repeating the steps for multiple times, controlling the dispersion coefficient of the moisture absorption rate within 10 percent, obtaining the average value of the moisture absorption rate, and judging the moisture absorption performance of the printing auxiliary agent under the steaming condition. The calculation formula is as follows:
in the formula: CV is the coefficient of variation,%, of the moisture absorption rate; r i In order to repeat the moisture absorption rate of the ith time,
the average moisture absorption rate was obtained by repeating n times, where n is the number of effective experiments, and in this example, n is 6.
The results of the hygroscopic properties of the different types of adjuvants under steaming conditions according to the above method are shown in table 1.
Table 1 moisture absorption properties under steaming conditions for different kinds of auxiliaries
As can be seen from table 1, the moisture absorption performance of different additives in the sodium alginate slurry film under steaming conditions is as follows: urea, glycerol, triethylene glycol, caprolactam and acetamide. The auxiliary agent has good hygroscopicity, is beneficial to absorbing more water when steaming, and helps the dye to redissolve and dye the fiber.
Example 2
(1) Taking 100g of sodium alginate raw paste with the viscosity of 10000 mPa.s, respectively adding 5g of 1, 3-butanediol, triethylene glycol and D-sorbitol auxiliary agent, uniformly stirring, standing at room temperature for defoaming, and respectively preparing the sodium alginate raw paste containing 5wt% of 1, 3-butanediol, triethylene glycol and D-sorbitol.
(2) 7g of pure sodium alginate raw paste and sodium alginate raw paste containing a printing aid (namely the sodium alginate raw paste containing 5wt% of 1, 3-butanediol, triethylene glycol and D-sorbitol aid) are respectively poured into a plurality of culture dishes of 70mm to ensure that the raw pastes are flatly filled in the bottoms of the culture dishes and have uniform and consistent thickness, and the culture dishes are dried at 90 ℃ to form films to constant weight, so that pure sodium alginate dry films and sodium alginate dry films containing the printing aid which are contained in the corresponding culture dishes are respectively obtained.
(3) And (3) steaming the culture dish and the dry film in a steamer at 102 ℃ for 40min respectively, and weighing to obtain the total mass of the pure sodium alginate wet film and the culture dish and the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish respectively.
(4) The moisture absorption rate is obtained by calculating the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish and the total mass of the pure sodium alginate wet film and the culture dish, and the calculation formula is as follows:
in the formula: r is moisture absorption rate,%; m 1 The total mass g of a pure sodium alginate wet film and a culture dish after drying and steaming treatment; m 2 The total mass g of the sodium alginate wet film containing the printing auxiliary agent and the culture dish after drying and steaming treatment.
(5) Repeating the steps for many times, controlling the dispersion coefficient of the moisture absorption rate within 10 percent, obtaining the average value of the moisture absorption rate, and judging the moisture absorption performance of the printing auxiliary agent under the steaming condition. The calculation formula is as follows:
in the formula: CV is the coefficient of variation,%, of the moisture absorption rate; r i In order to repeat the moisture absorption rate of the ith time,
in this example, n is 6, which is the average value of the moisture absorption rate obtained by repeating n times, and n is the number of effective experiments.
The results of the moisture absorption properties of the different alcoholic adjuvants under steaming conditions according to the above method are shown in table 2.
Table 2 moisture absorption properties of different alcoholic adjuvants under steaming conditions
As can be seen from Table 2, the hygroscopic properties exerted by the 1, 3-butanediol, triethylene glycol and D-sorbitol adjuvants in the sodium alginate size film under steaming conditions were as follows: d-sorbitol > triethylene glycol > 1, 3-butanediol. The more the number of hydroxyl contained in the auxiliary agent molecule is, the better the hygroscopicity is, the more water is absorbed by the auxiliary agent during steaming, the dye is dissolved again, and the fiber is dyed.
Example 3
(1) 100g of sodium alginate raw paste with the viscosity of 10000 mPas is taken, 5g of urea auxiliary agent is added, the mixture is uniformly stirred and stands at room temperature for defoaming, and the sodium alginate raw paste containing 5wt% of urea is prepared.
(2) 7g of pure sodium alginate raw paste and sodium alginate raw paste containing a printing aid (5 wt% of urea aid) are respectively poured into a plurality of culture dishes of 70mm to enable the pure sodium alginate raw paste and the sodium alginate raw paste to be flatly filled at the bottom of the culture dishes, the thicknesses of the pure sodium alginate raw paste and the sodium alginate raw paste are uniform, the pure sodium alginate raw paste and the sodium alginate raw paste are dried at 90 ℃ to form a film until the film is constant in weight, and pure sodium alginate dry films and sodium alginate dry films containing the printing aid which are contained in the corresponding culture dishes are respectively obtained.
(3) And (3) respectively putting the culture dish and the dry film into a steamer at 102 ℃ for steaming for 20min, 30min, 40min, 50min and 60min, and respectively weighing to obtain the total mass of the pure sodium alginate wet film and the culture dish and the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish.
(4) The moisture absorption rate is obtained by calculating the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish and the total mass of the pure sodium alginate wet film and the culture dish, and the calculation formula is as follows:
in the formula: r isMoisture absorption rate,%; m 1 The total mass g of a pure sodium alginate wet film and a culture dish after drying and steaming treatment; m 2 The total mass g of the sodium alginate wet film containing the printing auxiliary agent and the culture dish after drying and steaming treatment.
(5) Repeating the steps for many times, controlling the dispersion coefficient of the moisture absorption rate within 10 percent, obtaining the average value of the moisture absorption rate, and judging the moisture absorption performance of the printing auxiliary agent under the steaming condition. The calculation formula is as follows:
in the formula: CV is the coefficient of variation,%, of the moisture absorption rate; r i In order to repeat the moisture absorption rate of the ith time,
the average moisture absorption rate was obtained by repeating n times, where n is the number of effective experiments, and in this example, n is 6.
The results of the hygroscopic properties of urea at different steaming times according to the above method are shown in table 3.
TABLE 3 hygroscopic properties of urea at different steaming times
As can be seen from Table 3, the moisture absorption performance of urea in the sodium alginate slurry film is continuously enhanced with the increase of steaming time; after steaming for 40min, the moisture absorption performance of the fabric is basically kept unchanged, which indicates that the moisture absorption of the fabric reaches a saturated state.
Example 4
(1) And (2) taking 100g of sodium alginate raw paste with the viscosity of 10000 mPas, respectively adding 5g, 10g and 15g of urea auxiliary agent, uniformly stirring, standing at room temperature for defoaming, and respectively preparing the sodium alginate raw paste containing 5wt%, 9wt% and 13wt% of urea.
(2) 7g of pure sodium alginate raw paste and sodium alginate raw paste containing a printing aid (5 wt%, 9wt% and 13wt% of urea) are respectively poured into a plurality of culture dishes of 70mm to enable the raw paste to flow uniformly and fill the bottom of the culture dishes, the thickness of the raw paste is uniform, the raw paste is dried at 90 ℃ to form a film until the film is constant, and a pure sodium alginate dry film and a sodium alginate dry film containing a printing aid which are contained in the corresponding culture dishes are respectively obtained.
(3) And (3) steaming the culture dish and the dry film in a steamer at 102 ℃ for 40min respectively, and weighing to obtain the total mass of the pure sodium alginate wet film and the culture dish and the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish respectively.
(4) The moisture absorption rate is obtained by calculating the total mass of the sodium alginate wet film containing the printing auxiliary agent and the culture dish and the total mass of the pure sodium alginate wet film and the culture dish, and the calculation formula is as follows:
in the formula: r is moisture absorption rate,%; m 1 The total mass g of the pure sodium alginate wet film and the culture dish after drying and steaming treatment; m 2 The total mass g of the sodium alginate wet film containing the printing auxiliary agent and the culture dish after drying and steaming treatment.
(5) Repeating the steps for many times, controlling the dispersion coefficient of the moisture absorption rate within 10 percent, obtaining the average value of the moisture absorption rate, and judging the moisture absorption performance of the printing auxiliary agent under the steaming condition. The calculation formula is as follows:
in the formula: CV is the coefficient of variation,%, of the moisture absorption rate; r i In order to repeat the moisture absorption rate of the ith time,
the average moisture absorption was obtained by repeating the above steps n times.
The results of the hygroscopic properties of urea with different mass fractions under steaming conditions according to the above method are shown in table 4.
Table 4 hygroscopic properties of urea with different mass fractions under steaming conditions
As can be seen from table 4, the moisture absorption performance of urea in the sodium alginate slurry film is gradually improved as the amount of urea is increased.
Example 5
(1) Preparing reactive dye color paste according to the following sequence: water → active turquoise blue K-GL → auxiliary agent (urea, glycerol, triethylene glycol, caprolactam and acetamide) → salt-proof dyeing S → sodium alginate raw paste → sodium bicarbonate, stirring to be uniform and pasty system without any particles, standing at room temperature for 60min for defoaming, and preparing active dye color paste; wherein, the color paste prescription is as follows: 5wt% of active turquoise blue K-GL, 5wt% of auxiliary agent, 1wt% of dye-resistant salt S, 70wt% of raw paste and 3wt% of sodium bicarbonate.
(2) Measuring the viscosity of the color paste at room temperature by using a rotary viscometer with a No. 4 rotor at 30r/min, and adjusting the viscosity of the color paste to be about 10000mPa & s.
(3) At the magnetic bar of 8mm, the vehicle speed of 6m/min and the magnetic force of 3 # Printing the rayon fabric with reactive dye under the printing condition of a 150-mesh flat screen, and printing 10 x 10cm 2 Drying the square large block surface pattern at 80 ℃ for 2min; subsequently steaming in a steamer at 102 ℃ for 10min; and testing the printing performance.
The printing properties of the pastes on rayon fabrics according to the above method using different auxiliaries are shown in Table 5.
TABLE 5 hygroscopic properties of different auxiliaries under steaming conditions and their printing properties on rayon fabrics
As can be seen from table 5, under steaming conditions, the urea with good hygroscopicity has good surface color yield of the printed fabric and higher vividness, while the glycerin and triethylene glycol auxiliaries with good hygroscopicity also have good surface color yield of the printed fabric, which is lower than the urea printing level, and the acetamide auxiliaries with poor hygroscopicity have low surface color yield of the printed fabric and lower vividness of the printed fabric. Therefore, the moisture absorption performance of the auxiliary agent is closely related to the printing effect, and the auxiliary agent with better moisture absorption performance is beneficial to the printed fabric to obtain higher surface color yield and brighter color. The method can be used for detecting the moisture absorption performance of different auxiliaries under steaming conditions, and has certain guiding significance for the actual production of printing.
Claims (3)
1. A method for detecting the moisture absorption performance of a printing auxiliary agent under steaming conditions is characterized by comprising the following steps:
(1) Adding a printing auxiliary agent into the sodium alginate raw paste to prepare the sodium alginate raw paste containing the printing auxiliary agent;
(2) Respectively pouring the prepared pure sodium alginate raw paste and the sodium alginate raw paste containing the printing auxiliary agent into a flat-bottomed container, leveling the flat-bottomed container to fill the bottom of the container, and drying the flat-bottomed container to form a film until the thickness of the flat-bottomed container is uniform and consistent, thereby obtaining a dry film;
(3) Putting the container and the dry film into a steaming machine for steaming, and weighing to obtain the total mass of the container and the wet film;
(4) Calculating to obtain the moisture absorption rate;
(5) Repeating the steps (2) to (4) for multiple times to obtain multiple moisture absorption rate data, controlling the dispersion coefficient of the moisture absorption rate within 10%, obtaining the average value of the moisture absorption rate, and obtaining the moisture absorption performance of the printing auxiliary agent under the steaming condition;
the apparent viscosity of the sodium alginate raw paste in the step (1) is measured to be 8000-12000 mPa & s by a rotary viscometer with a No. 4 rotor of 30 r/min;
in the step (2), the container is a culture dish, the diameter of the culture dish is 60-80 mm, the adding amount of the sodium alginate raw paste is 5-10 g, and the drying temperature is 80-100 ℃;
the steaming temperature in the step (3) is 101-104 ℃, and the steaming time is 30-60 min;
the calculation formula of the moisture absorption rate in the step (4) is as follows:
in the formula: r is moisture absorption rate,%; m 1 The total mass g of the pure sodium alginate wet film and the container after drying and steaming treatment; m is a group of 2 The total mass g of the sodium alginate wet film containing the printing auxiliary agent and the container after drying and steaming treatment.
2. The method for detecting the moisture absorption performance of the printing auxiliary agent under the steaming condition as claimed in claim 1, wherein the mass fraction of the printing auxiliary agent in the raw paste in the step (1) is 1-20%.
3. A method for detecting the moisture absorption performance of printing auxiliary agent under steaming condition according to claim 1, wherein the calculation formula of the dispersion coefficient of moisture absorption rate in the step (5) is as follows:
in the formula: CV is the coefficient of variation,%, of the moisture absorption rate; r i In order to repeat the moisture absorption rate of the ith time,
the average moisture absorption was obtained by repeating the above steps n times.
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