CN117532791A

CN117532791A - Preparation process of natural latex sponge glove

Info

Publication number: CN117532791A
Application number: CN202311359942.4A
Authority: CN
Inventors: 李平; 赵庆雄; 李羽枝; 王风光
Original assignee: Anhui Nanfang Medical Products Co ltd
Current assignee: Anhui Nanfang Medical Products Co ltd
Priority date: 2023-10-19
Filing date: 2023-10-19
Publication date: 2024-02-09

Abstract

The invention discloses a preparation process of natural latex sponge gloves, which comprises the following steps: washing the die, namely firstly washing the die with acid and then washing the die with alkali, wherein the concentration of the acid in the acid washing tank is controlled to be 3-5%, the concentration of the alkali in the alkali washing tank is controlled to be 4-6%, clear water is sprayed to the die between the acid tank and the alkali tank, the die is immersed in a coagulant tank, the temperature in the coagulant tank is 40-60 ℃, the stirring speed is 15-50 r/min, the coagulant is dried, and the die immersed with the coagulant is dried by a coagulant oven, and the drying temperature is controlled to be 80-150 ℃; the sponge-like structure of the glue layer after the secondary dipping is realized through the special process foaming, so that the inner glue layer is like a sponge, the glove is soft and comfortable to wear, sweat absorption, skid resistance and heat preservation are realized, and meanwhile, the flexibility of the sponge glove is further improved and the quality of the sponge glove is improved through improving the existing production process and the proportioning of ingredients.

Description

Preparation process of natural latex sponge glove

Technical Field

The invention relates to the technical field of latex sponge glove preparation processes, in particular to a natural latex sponge glove preparation process.

Background

The latex glove is a soft glove which is made by adopting latex for delivery, has wear resistance, puncture resistance, acid and alkali resistance, grease, fuel oil, various solvents and the like, has wide chemical resistance and good oil-proof effect.

In the existing latex glove production process, a production process of one-time gum dipping is generally adopted, and in the latex glove produced by one-time gum dipping, in the process of later drying, the phenomenon of breakage easily occurs in the process of demolding and pulling due to the compactness of a gum layer, meanwhile, the latex glove produced by one-time gum dipping is weak in flexibility, in the actual use process, the phenomenon of breakage often occurs, and further, the condition of liquid leakage occurs, so that the quality and quality of the existing latex glove are improved, and further, the production process and the process proportion of the existing latex glove are required to be further optimized.

Disclosure of Invention

The invention aims to provide a preparation process of natural latex sponge gloves, which aims to solve the problems that the production quality of the latex gloves provided in the background art has certain limitation, the gloves are easy to damage, the flexibility is not strong and the like due to the adoption of a one-time gum dipping production mode.

In order to achieve the above purpose, the present invention provides the following technical solutions: a preparation process of natural latex sponge gloves comprises the following steps:

s1, washing the die, namely placing the die into a pickling tank and an alkaline washing tank to carry out pickling and alkaline washing respectively, wherein the concentration of acid in the pickling tank is 3-5%, and the concentration of alkali in the alkaline washing tank is 4-6%; after pickling, placing the hand mould into an alkaline washing tank, and spraying clear water to clean the hand mould;

s2, immersing the coagulant in the coagulant tank, stirring the coagulant in the coagulant tank, and immersing the hand mold with the washed mold in the coagulant tank, wherein the temperature in the coagulant tank is 40-60 ℃, and the stirring speed is 15-50 rpm;

s3, drying the coagulant, and drying the hand mould immersed with the coagulant through a coagulant oven, wherein the drying temperature is controlled to be 80-150 ℃;

s4, dipping a first layer of glue, stirring glue solution in a first glue tank pool, and dipping a hand die into the first glue tank pool, wherein the temperature in the first glue tank pool is 25-40 ℃ and the stirring rotation speed is 15-50 revolutions per minute; the first glue tank pool control parameters for each index are shown in table 1 below:

index name	Control parameters
		Latex total solids%	25～44
PH	9.5～13.0
		Chloroform value	Three middle to four primary stages

TABLE 1

S5, shaping, namely conveying the hand mould attached with the adhesive film into a shaping box for high-temperature drying shaping, wherein the temperature of the shaping box is 60-150 ℃;

s6, dipping a second layer of glue, stirring glue solution in a second glue tank pool, and then conveying the shaped hand mould into the second glue tank pool, wherein the temperature in the second glue tank pool is 25-40 ℃, the stirring rotation speed is 15-50 revolutions per minute, and the control parameters of each index controlled by the second glue tank pool are shown in the following table 2:

index name	Control parameters
		Latex total solids%	20～40
PH	9.5～13.0
		Chloroform value	Three middle to four primary stages

TABLE 2

S7, pre-leaching, namely conveying the hand mould subjected to the second gum dipping to a leaching tank containing clean water, wherein leaching is a process of dissolving soluble substances in a glue film in water, removing protein, alkali, salt and other substances which are unfavorable for glove performance and contained in the glue film, the leaching water is clean water, and the operation process is sufficient and continuous clean water to be filled, so that the water temperature in the leaching tank is 50-60 ℃;

s8, a dip-coating layer is further conveyed into a coating groove, so that a layer of coating is attached to the outermost layer of the glove, wherein the temperature in the coating groove is 20-35 ℃, the stirring speed is 15-50 r/min, the solid content is 1.0-3.0%, the dip-coating layer is used for enabling the surface of the rubber mold to be attached with a layer of polymer which is very smooth after being dried, the glove is convenient to use and wear, the coating liquid in the coating groove is required to be bubble-free, and the coating is required to flow;

s9, hemming, namely, hemming the edge of the wrist opening of the glove by using a hemming hairbrush, so that the glove is convenient to demolding and wearing, and the hemming is required to be round, uniform, firm, moderate in size, free of side bubbles and free of side twisting. The curled hair brush needs to be proper in tightness and hardness to enable curled hair to meet the requirement;

s10, drying and vulcanizing, namely firstly conveying a glue film containing more water into a warm vulcanizing furnace, controlling the temperature in the warm vulcanizing furnace to be 80-100 ℃, preventing the surface from being dried too quickly due to the fact that the surface temperature of the glue film is too high, affecting the volatilization of the water in the glue film, enabling the water in the glue film to be conveyed into the dry vulcanizing furnace after evaporating most of the water in the glue film, controlling the temperature in the dry vulcanizing furnace to be 120-140 ℃ at the moment, enabling the inside of the glue film to undergo vulcanization reaction, and meanwhile, controlling the temperature in the dry vulcanizing furnace to be 120-140 ℃ at the moment, wherein the stage is also an important period of producing a sponge body by a second layer of glue, and enabling a sponge agent in the glue to undergo chemical reaction at the higher temperature and continuously produce gas, so that a sponge-state glue film is formed;

s11, after leaching, conveying the adhesive film to a leaching tank with the temperature of 60-80 ℃, and removing protein, alkali and salt substances attached to the adhesive film again through high temperature water;

s12, drying the glove, namely conveying the adhesive film glove into a drying box for drying, so that moisture attached to the adhesive film glove is removed, wherein the temperature in the drying box is controlled at 80-120 ℃;

s13, demolding, namely taking off the dried glove from the hand mold by using a glove demolding machine, wherein the glove is smooth in inner and outer surfaces and the demolding can be successfully completed when the vulcanization degree of the latex is proper. The sponge layer adhesive is soft, has more surface pores, relatively poor stretching performance, larger friction force between adhesive films during demolding, and can be demolded only by the adhesive film with better stretching performance and smoothness, so that the proper demolding force is adjusted, and the dosage of the release agent and the coating is properly increased;

s14, after-vulcanization, conveying the demolded glove into a cleaning tank at 70-90 ℃ for secondary soaking and washing for 30-60 minutes, and performing secondary drying, wherein the temperature in a drying box is controlled at 70-110 ℃, and the drying time is controlled at 30-120 minutes.

Preferably, the coagulant has the following formula and weight proportion:

the coagulant configuration essential points are: pumping soft water into a coagulant preparation tank, adding calcium nitrate under stirring, adding a release agent and a wetting agent, stirring for 24 hours to eliminate bubbles, placing into a coagulant tank on a production line, stirring to enable the coagulant to flow for defoaming, and eliminating bubbles for about 2 hours to produce the product.

Preferably, the formula and the weight portion of the coating are as follows:

12.0 parts of coating stock solution

88.0 parts of soft water

The coating configuration key points are as follows: soft water is pumped into a coating preparation tank, the coating is pumped into the coating preparation tank and stirred for 4 hours, the coating is uniformly dispersed and then is put into the coating of a production line, the stirring is started to enable the coating liquid to flow, and the coating can be used after 2 hours.

Preferably, the formula and the weight portion of the first layer of glue are as follows:

the first layer glue is configured with the following points: under the stirring state, slowly adding a stabilizer, a vulcanizing agent, an active agent, an accelerator and an anti-aging agent into the latex, after stirring uniformly, heating the latex by introducing hot water into a tank interlayer to enable the chloroform value of the latex to reach three-middle-four initial times, stopping heating, introducing cold water into the interlayer to enable the latex to be cooled to normal temperature, adding soft water into the vulcanized latex to enable the solid content of the latex to reach 24% -40%, filtering the vulcanized latex by using a 100-mesh screen to be placed in a parking tank for more than 24 hours to enable the latex to be defoamed, then placing the latex in a first glue tank of a production line, and starting stirring to enable the latex to circularly flow for more than 2 hours for later use.

Preferably, the formula and the weight portion of the second layer of glue are as follows:

the second layer glue is configured with the following points: under the stirring state, slowly adding a stabilizer, a vulcanizing agent, an active agent, an accelerator and an anti-aging agent into the latex, after stirring uniformly, heating the latex by introducing hot water into a tank body interlayer to enable the chloroform value of the latex to reach three-middle-four initial times, stopping heating, introducing cold water into the interlayer to enable the latex to be cooled to normal temperature, adding a spongy agent, a thickening agent and soft water into the vulcanized latex to enable the solid content of the latex to reach 24% -40%, filtering the latex by using a 100-mesh screen to be parked for more than 24 hours to enable the latex to be defoamed, and then placing the latex into a first rubber groove of a production line, starting stirring to enable the latex to circularly flow for more than 2 hours for standby.

Compared with the prior art, the invention provides a preparation process of natural latex sponge gloves, which has the following beneficial effects:

1. the sponge-like structure of the glue layer after the secondary dipping is realized through foaming in the inner layer of the glove by a special process, so that the inner glue layer is in a sponge shape, and the glove is soft and comfortable to wear, has sweat-absorbing, anti-skid and heat-insulating effects, and further improves the flexibility of the sponge glove and the quality of the sponge glove by improving the existing production process and the existing proportioning of ingredients.

2. According to the invention, the tensile property of the first layer of glue is improved through the improved production process, and meanwhile, the formation of the second layer of sponge colloid is realized through the proportioning arrangement of the second layer of glue and the optimization of the production process, so that the flexibility of the sponge glove is ensured, and the normal detachment of the later demolding is ensured.

Drawings

FIG. 1 is a flow chart of a process for preparing the sponge glove of the invention;

FIG. 2 is a schematic diagram showing the distribution of the sponge glove preparation apparatus of the present invention;

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1:

referring to fig. 1, the present invention provides a technical solution: a preparation process of natural latex sponge gloves comprises the following steps:

the coagulant has the following formula and weight proportion:

TABLE 1

The formula and the weight portion of the first layer of glue are as follows:

TABLE 2

The latex of the second layer of glue is presulfided according to the method of presulfiding the latex of the first layer of glue, the latex is put into a second glue tank, and can be put into production after being defoamed by adopting the same method, and the formula and the weight part of the second layer of glue are as follows:

the formula and the weight portion of the coating are as follows:

12.0 parts of coating stock solution

88.0 parts of soft water

s10, drying and vulcanizing, namely firstly conveying a glue film containing more water into a warm vulcanizing furnace, controlling the temperature in the warm vulcanizing furnace to be 80-100 ℃, preventing the surface from being dried too quickly due to the fact that the surface temperature of the glue film is too high, affecting the volatilization of the water in the glue film, evaporating most of the water in the glue film, and then conveying the water into the dry vulcanizing furnace, wherein the temperature in the dry vulcanizing furnace is controlled to be 120-140 ℃ at the moment, so that the inside of the glue film is vulcanized, and meanwhile, the stage is an important period of producing a sponge body by a second layer of glue, and the sponge agent in the glue is subjected to chemical reaction at the higher temperature and continuously produces gas, so that a sponge-state glue film is formed;

s12, drying, namely conveying the adhesive film gloves into a drying box for drying, so that moisture attached to the adhesive film gloves is removed, wherein the temperature in the drying box is controlled to be 80-120 ℃;

Pumping natural latex into a pre-vulcanizing tank by a diaphragm pump, slowly adding diluted stabilizer under stirring, slowly adding vulcanizing agent, accelerator, active agent and anti-aging agent, and adding 500 kg soft water. And (3) hot water at 60-70 ℃ enters an interlayer of the pre-vulcanizing tank, a water outlet of the interlayer is opened, the hot water is continuously heated to the latex, the temperature of the latex is increased to 55-60 ℃ Guan Reshui, the latex is kept warm until the chloroform value of the latex reaches the third level, cold water is put into the interlayer of the pre-vulcanizing tank to cool the latex to below 35 ℃, guan Lengshui, and the latex pre-vulcanizing is completed.

Note that: the chloroform level method is a method of adding two volumes of chloroform to a volume of latex, solidifying the latex, and then expressing the degree of vulcanization by using a gel state, and the specific division method of the degree of vulcanization of the latex is as follows:

and (2) second-stage: and II, firstly: the gel is in a dough shape, can be pulled long and has viscosity.

And II: the gel is in a dough shape and can be pulled to a considerable extent.

Two ends: the gel is in a dough shape, and is slightly elongated and broken, but is relatively tough.

Three stages: three primary steps: the gel is in a dough shape, and breaks when pulled, but the gel is thinner and smoother.

And III: the gel is granular and has a rough surface.

Three ends: the gel is granular and can be kneaded into a mass, and after the pressure is removed, the gel is obviously contracted.

Four stages: fourthly, initially: the gel is granular and can be kneaded into clusters, but the granules and the clusters are rough, and the gel slightly contracts after the pressure is removed.

Fourth,: the gel is granular, is not easy to agglomerate, has a fine crushing trend and has no shrinkage phenomenon.

Four ends: the gel is all in a very small particulate state.

After the vulcanized latex reaches the chloroform value III and is cooled to 35 ℃, adding the rest soft water into the latex, stirring uniformly, filtering the mixture into a latex parking tank by using a 80-mesh screen, removing bubbles on the surface of the latex, stirring for 4 hours, placing the latex into a first rubber tank of a production line, stirring in a rubber opening tank, enabling the latex to flow and circulate for more than 4 hours, and eliminating bubbles in the latex and enabling the latex to enter production.

Working principle:

referring to fig. 2, the mold washing liquid is added into the mold washing tank, the clean water is added into each water tank, the clean water is added into the front and rear leaching tanks, the glue tank, the coagulator tank and the coating tank are inspected to be discharged according to the requirements, after the production conditions are met, the production line is started after the equipment facilities of the production line are inspected to be normal, the temperature is raised, so that the temperatures of each water tank, the coagulator tank and each oven reach the production requirements, and then the machine is started for production.

After the control indexes of all the parts reach the standard, the tightness and the hemming length of the hemming machine are adjusted, and the production is prepared.

When the reserved vacancy on the chain of the production line is found and the chain is operated to the coagulant tank, the handle mould is put down, so that the handle mould is immersed in the coagulant through the coagulant tank, and the observation of the liquid level of the coagulant must meet the requirement.

And (3) drying the hand mould immersed with the coagulant in a coagulant oven, then putting the hand mould into a first glue tank, and putting down the hand mould for dipping, wherein the liquid level of the latex reaches the standard.

The hand mould which is completely shaped by the shaping box reaches the second glue groove, the hand mould is immersed into the glue for the second time, and the liquid level of the latex reaches the standard.

After the hand mould immersed with the second glue is shaped by the second shaping box, the glue film is completely solidified, enters the front leaching groove, and is leached with 4 grooves. Note the water temperature in the front leaching tank, which must reach the standard.

After pre-leaching and dripping, the coating is dipped, the liquid level of the coating is noted, and the coating cannot be dipped beyond the hemming position.

After dripping the coating on the surface, the hemming position is reached. Note that the size of the bead is moderate and the film without the dip coating is rolled to the edge.

After the hemming is completed, the mixture enters a vulcanization drying oven. The temperature of the front section of the vulcanization drying oven is controlled to be 100-120 ℃, and the temperature of the rear section is controlled to be 120-150 ℃.

After the vulcanization and drying are completed, the process enters a post leaching process. The post-leaching also has four leaching tanks. Note that the water temperature of the water tank reaches the standard.

After the post leaching is completed, the water on the surface is dried by an oven, and the temperature is controlled to be 100-120 ℃.

And after the glove is completely dried, the glove enters a demolding process. Glove stripping is accomplished by an automatic glove stripper. The demolding quality of the demolding machine is observed, and the demolding quality is adjusted in time.

The demolded glove is sent to a post-vulcanization process, and put into a special glove boiling machine to be boiled with hot water. The temperature of the hot water is controlled between 70 and 90 ℃, and the glove boiling time is 30 to 60 minutes.

And (5) putting the cooked gloves into a special glove dryer for drying and vulcanizing after the gloves are dried and dehydrated. The temperature of drying and vulcanizing is controlled at 70-110 ℃ and the time is controlled at 30-120 minutes, which is based on the condition that the glove reaches or approaches to positive vulcanization and the glove does not age or change color.

And (3) drying, vulcanizing and cooling the glove, inspecting the glove by an inspection and assembly room, picking out the glove with unqualified appearance, packaging the qualified glove according to the requirement, and warehousing after packaging.

Glove tensile test results

Before aging (as shown in Table 3)

Numbering device	Breaking force N	Elongation at break%	300% constant extension load
				1	24.5	860	1.2
2	25.7	840	1.1
				3	25.6	790	1.3
4	24.9	850	1.4
				5	26.3	820	1.3
6	23.2	950	1.2
				7	24，1	920	1.3
8	22.8	810	1.3
				9	25.9	880	1.4
10	23.6	840	1.1
				11	24.2	780	1.2
12	25.8	930	1.2
				13	23.6	870	1.3

TABLE 3 Table 3

After aging (as shown in Table 4)

TABLE 4 Table 4

The test result meets the tensile property requirement of GB7543 disposable rubber surgical gloves.

Finally, it should be noted that the above description is only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and that the simple modification and equivalent substitution of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. The preparation process of the natural latex sponge glove is characterized by comprising the following steps of:

s4, dipping a first layer of glue, stirring glue solution in a first glue tank pool, and dipping a hand die into the first glue tank pool, wherein the temperature in the first glue tank pool is 25-40 ℃ and the stirring rotation speed is 15-50 revolutions per minute;

s6, dipping a second layer of glue, stirring glue solution in a second glue tank pool, and then conveying the shaped hand mould into the second glue tank pool, wherein the temperature in the second glue tank pool is 25-40 ℃ and the stirring rotation speed is 15-50 revolutions per minute;

s7, pre-leaching, namely conveying the hand mould subjected to the second gum leaching to a leaching tank containing clean water, and removing protein, alkali and salt substances contained in the adhesive film, wherein the water temperature in the leaching tank is 50-60 ℃;

s8, dip-coating, further conveying the hand mould into a coating groove to enable the outermost layer of the glove to be attached with a layer of coating, wherein the temperature in the coating groove is 20-35 ℃, the stirring speed is 15-50 revolutions per minute, and the solid content is 1.0-3.0%;

s9, hemming, namely hemming the edge of the wrist opening of the glove by using a hemming hairbrush;

s10, drying and vulcanizing, namely firstly conveying the adhesive film containing more water into a warm vulcanizing furnace, wherein the temperature in the warm vulcanizing furnace is controlled to be 80-100 ℃, so that most of the water in the adhesive film is evaporated and then conveyed into the dry vulcanizing furnace, and the temperature in the dry vulcanizing furnace is controlled to be 120-140 ℃ at the moment, so that the inside of the adhesive film is subjected to vulcanization reaction, and a sponge adhesive film is formed;

s13, demolding, namely taking off the dried glove from the hand mold by using a glove demolding machine;

2. The process for preparing the natural latex sponge glove according to claim 1, wherein the coagulant comprises the following components in parts by weight:

3. The process for preparing the natural latex sponge glove according to claim 1, wherein the formula and the weight ratio of the coating are as follows:

12.0 parts of coating stock solution

88.0 parts of soft water

4. The process for preparing the natural latex sponge glove according to claim 1, wherein the process comprises the following steps: the formula and the weight portion of the first layer of glue are as follows:

5. The process for preparing the natural latex sponge glove according to claim 1, wherein the process comprises the following steps: the formula and the weight portion of the second layer of glue are as follows: