CN111040206A - Preparation method of medical gloves made of mixed latex - Google Patents

Abstract

The invention provides a method for preparing medical gloves with mixed latex, and particularly relates to the technical field of glove preparation, wherein the method comprises the steps of firstly preparing mixed matched latex, namely independently preparing two kinds of latex with different properties into the matched latex, and then mixing and filtering the prepared two kinds of matched latex according to a proportion into a rubber tank for later use; finally, the prepared mixed compounded latex is used to prepare the mixed latex medical gloves. The invention adopts two kinds of latex to prepare separately, adds different stabilizers and vulcanization accelerators according to the properties of the latex, and then matches the prepared two kinds of matching latex according to different proportions, thereby leading the two kinds of latex to achieve continuous stability in the production process and leading the rubber film to achieve consistent vulcanization speed in the vulcanization process.

Description

Preparation method of medical gloves made of mixed latex

Technical Field

The invention belongs to the technical field of glove preparation, and particularly relates to a preparation method of a medical glove made of mixed latex.

Technical Field

The existing medical gloves can not be simultaneously provided with oil resistance and wearability, so people think that two kinds of latex with different properties are mixed to prepare the gloves so as to have the performance of the two kinds of latex, but the mechanical stability and the chemical stability after the two kinds of latex are mixed are unstable, so that the prepared products are unstable and cannot reach an ideal state.

Therefore, a method for preparing a latex blend medical glove which solves the existing problems is urgently needed.

Disclosure of Invention

The invention aims to provide a preparation method of a latex mixed medical glove, which comprises the steps of independently preparing two kinds of latex, adding different stabilizers and vulcanization accelerators according to the properties of the latex, and then matching the prepared butyronitrile mixed latex with natural latex mixed latex according to different proportions, so that the two kinds of latex are continuously stable in the production process, and the rubber film achieves the consistent vulcanization speed in the vulcanization process.

The technical scheme is as follows:

a preparation method of the mixed latex medical gloves comprises the following steps:

s1, preparing mixed compound latex: separately preparing two kinds of latexes with different properties into compound latexes, and then mixing and filtering the prepared two kinds of compound latexes into a glue tank for later use according to a proportion;

s2, hybrid latex medical gloves are prepared using the hybrid compounded latex prepared in step S1.

The two latexes are completely different in structure, the two latexes are independently prepared, different stabilizers and vulcanization accelerators are added according to the properties of the latexes, and then the prepared two matched latexes are matched according to different proportions, so that the two latexes are continuously stable in the production process, and the vulcanization speed of a glue film is consistent in the vulcanization process.

Preferably, the two latexes are butyronitrile latex and natural latex respectively. The two different latexes are mixed to manufacture the mixed latex medical gloves, so that the oil resistance and the wearing resistance of the conventional medical gloves are improved.

Preferably, the preparation method of the butyronitrile compound latex and the natural rubber compound latex comprises the following steps:

① preparation of butyronitrile complex latex, 20% potassium hydroxide aqueous solution, 50% sulfur dispersion, 40% sodium dibutyldithiocarbamate (TP) solution, 50% zinc oxide dispersion, 40% antioxidant dispersion, 70% titanium white slurry dispersion and 5% defoamer aqueous solution are added into 43.5% butyronitrile latex in sequence under the condition of stirring.

② preparation of natural rubber latex, 20% potassium hydroxide solution, 20% potassium metasilicate solution, 50% sulphur dispersion, 40% zinc Butyldithiocarbamate (BZ) dispersion, 50% zinc oxide dispersion, 40% antioxidant dispersion and 5% defoamer solution are added into 60% natural rubber latex in sequence under stirring.

Preferably, the raw materials in the butyronitrile compound latex and the natural rubber compound latex are respectively as follows according to parts by weight:

nitrile butadiene latex compounding:

100 parts of butyronitrile latex;

1.0-2.0 parts of KOH;

2.0-4.0 parts of sulfur;

1.0-3.0 parts of TP;

2.0-4.0 parts of ZnO;

0.5-2.5 parts of anti-aging agent;

0.5-1.0 part of titanium dioxide;

0.2-0.8 part of defoaming agent.

Matching natural rubber with latex:

100 parts of natural latex;

1.0-3.0 parts of KOH;

0.1-0.5 part of potassium metasilicate;

1.0-3.0 parts of sulfur;

0.5-1.5 parts of BZ;

1.5-2.5 parts of ZnO;

0.5-2.5 parts of anti-aging agent;

0.1-0.5 part of defoaming agent.

Preferably, the mass percentages of the butyronitrile compound latex and the natural rubber compound latex in the mixed compound latex are as follows:

nitrile butadiene latex compounding: 70% -80%;

matching natural rubber with latex: 20 to 30 percent.

Preferably, the preparation method of the sulfur dispersion, the anti-aging agent dispersion, the zinc oxide dispersion and the zinc butyldithiocarbamate dispersion is as follows:

sulfur dispersion: 100 parts of sulfur, 0.1-0.5 part of potassium hydroxide and 3.0-5.0 parts of dispersing agent NF; sequentially adding sulfur, potassium hydroxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain a sulfur dispersion;

anti-aging agent dispersion: 100 parts of anti-aging agent WL, 0.1-0.3 part of potassium hydroxide and 3.0-5.0 parts of dispersing agent NF; sequentially adding an anti-aging agent WL, potassium hydroxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain an anti-aging agent dispersoid;

zinc Butyldithiocarbamate (BZ) dispersion: 100 parts of zinc Butyldithiocarbamate (BZ), 0.2-0.5 part of potassium hydroxide and 3.0-5.0 parts of dispersing agent NF; sequentially adding zinc Butyldithiocarbamate (BZ), potassium hydroxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain a zinc Butyldithiocarbamate (BZ) dispersion;

zinc oxide dispersion: 100 parts of zinc oxide and 3.0-5.0 parts of dispersing agent NF; and sequentially adding zinc oxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain the zinc oxide dispersoid.

Preferably, the specific steps of step S2 are as follows:

(1) preheating the cleaned die by soaking in hot water, wherein the water tank is a calcium nitrate water solution with the calcium content of 9-10%, and the temperature is more than or equal to 65 ℃;

(2) preheating a mould, and then immersing the mould into a coagulant tank, wherein the coagulant tank is internally provided with 15-16% of calcium nitrate coagulant at the temperature of 58-60 ℃, and then drying the mould in a coagulant drying furnace at the drying temperature of 80-100 ℃;

(3) dipping the dried mould into a glue tank filled with the mixed matching latex in the step S1 for glue dipping, wherein the temperature in the glue tank is 26-28 ℃, and then carrying out glue film shaping on the mould through a glue film shaping furnace, wherein the temperature in the glue film shaping furnace is 100-120 ℃;

(4) carrying out hot water leaching on the mold with the adhesive film after the adhesive film is shaped, wherein the temperature of the leached water is 45-50 ℃, then drying the mold through an adhesive film drying furnace, wherein the temperature in the adhesive film drying furnace is 90-110 ℃, and curling the dried adhesive film;

(5) vulcanizing the rolled adhesive film in an adhesive film vulcanizing furnace at the temperature of 110-130 ℃;

(6) naturally cooling the rubber film after the rubber film is completely vulcanized, and then cooling the rubber film by cooling water, wherein the water temperature of a cooling water tank is not higher than 45 ℃;

(7) sequentially immersing the cooled adhesive film into 800PPm chlorine water and 10% potassium hydroxide aqueous solution with the pH value of 10-13, wherein the temperatures of the chlorine water and the potassium hydroxide aqueous solution are not higher than 43 ℃;

(8) and (3) after the rubber film soaked in 800PPm chlorine water and 10% potassium hydroxide water solution passes through a drying furnace, removing the rubber film from the mold, and thus completing the preparation of the latex-mixed medical glove.

Preferably, the preparation method of the coagulant in the step (2) is as follows:

dissolving calcium nitrate into 15-16% calcium nitrate water solution by using hot water at 70-80 ℃, then sequentially adding light calcium powder, a defoaming agent and a surfactant peregal O, and uniformly stirring for later use, wherein the calcium nitrate water solution comprises the following components in parts by weight: 15-16 parts of calcium nitrate, 2-6 parts of light calcium powder, 0.1-0.5 part of defoaming agent and 0.3-0.6 part of surfactant peregal O.

The invention has the beneficial effects that:

two kinds of latex are independently prepared, different stabilizers and vulcanization accelerators are added according to the properties of the latex, and then the prepared butyronitrile compound latex and the natural latex compound latex are matched according to different proportions, so that the two kinds of latex are continuously stable in the production process, and the vulcanization speed of a rubber film is consistent in the vulcanization process.

Detailed Description

Example 1

A preparation method of the mixed latex medical gloves comprises the following steps:

1. preparing raw materials such as a sulfur dispersion, an anti-aging agent dispersion, a zinc oxide dispersion, a zinc Butyldithiocarbamate (BZ) dispersion and the like, wherein the raw materials comprise the following components:

preparing a sulfur dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and sulfur into a grinding machine, and grinding for 36 hours to obtain a sulfur dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of sulfur, 0.1 part of potassium hydroxide, 5.0 parts of dispersing agent NF and 94.9 parts of softened water are prepared into a sulfur dispersion with the mass percentage of 50 percent of sulfur.

Preparing an anti-aging agent dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and an anti-aging agent WL into a grinding machine, and grinding for 36 hours to obtain an anti-aging agent dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein 100 parts of anti-aging agent, 0.1 part of potassium hydroxide, 3.0 parts of dispersing agent NF and 146.9 parts of softened water, and the anti-aging agent dispersoid with the mass percentage of the anti-aging agent being 40% is prepared.

Preparing zinc oxide dispersoid, namely adding softened water, a dispersing agent NF and zinc oxide into a grinding machine in sequence, and grinding for 2-4 hours to prepare the zinc oxide dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of zinc oxide, 3.0 parts of dispersing agent NF and 97 parts of softened water; the zinc oxide dispersion with the mass percent of the zinc oxide being 50% is prepared.

Preparing a zinc Butyldithiocarbamate (BZ) dispersion, namely sequentially adding softened water, a dispersing agent NF, potassium hydroxide and BZ into a grinding machine, and grinding for 36 hours to obtain the zinc Butyldithiocarbamate (BZ) dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein 100 parts of zinc Butyldithiocarbamate (BZ), 0.2 part of potassium hydroxide, 3.0 parts of dispersing agent NF and 146.8 parts of softened water are used for preparing the zinc butyldithiocarbamate dispersion with the mass percentage of the zinc butyldithiocarbamate being 40%.

In addition, a potassium hydroxide aqueous solution with a mass percent of potassium hydroxide of 20%, a sodium dibutyldithiocarbamate (TP) solution with a mass percent of sodium dibutyldithiocarbamate of 40%, a titanium white slurry dispersion with a mass percent of titanium white, a defoamer aqueous solution with a mass percent of 5% (all the defoamers used in examples 1 to 4 are silicone defoamers), a butyronitrile latex aqueous solution with a mass percent of butyronitrile latex of 43.5%, a potassium metasilicate solution with a mass percent of potassium metasilicate of 20%, and a natural latex aqueous solution with a mass percent of natural latex of 60% were prepared, respectively.

2. Preparation of a mixed compounded latex: respectively and independently preparing butyronitrile latex and natural latex to respectively obtain butyronitrile matching latex and natural rubber matching latex, mixing 80% of butyronitrile matching latex and 20% of natural rubber matching latex by mass percent, filtering the obtained mixed matching latex into a rubber tank for later use by four layers of nylon cloth, and avoiding the opening of a gel skin rubber tank circulating device of the matching latex in the rubber tank and the continuous circulation of the matching latex in the rubber tank;

① preparation of butyronitrile complex latex, under the condition of stirring, 20% potassium hydroxide aqueous solution, 50% sulfur dispersion, 40% sodium dibutyldithiocarbamate (TP) solution, 50% zinc oxide dispersion, 40% antioxidant dispersion, 70% titanium white slurry dispersion and 5% defoamer aqueous solution are sequentially added into 43.5% butyronitrile latex, wherein, the butyronitrile latex comprises 100 parts by weight of butyronitrile latex, 1.0 part by weight of KOH, 2.0 parts by weight of sulfur, 3.0 parts by weight of sodium dibutyldithiocarbamate (TP), 4.0 parts by weight of zinc oxide (ZnO), 0.5 part by weight of antioxidant, 0.5 part by weight of titanium white and 0.2 part by weight of defoamer.

② Natural rubber latex is prepared by sequentially adding 20% potassium hydroxide aqueous solution, 20% potassium metasilicate solution, 50% sulfur dispersion, 40% zinc Butyldithiocarbamate (BZ) dispersion, 50% zinc oxide dispersion, 40% antioxidant dispersion and 5% defoamer aqueous solution into 60% natural rubber latex under stirring, wherein the natural rubber latex comprises, by weight, 100 parts of natural rubber latex, 3.0 parts of KOH, 0.1 part of potassium Butyldithiocarbamate (BZ), 1.0 part of sulfur, 0.5 part of zinc Butyldithiocarbamate (BZ), 1.5 parts of zinc oxide (ZnO), 0.5 part of antioxidant and 0.5 part of defoamer.

3. Preparation of the coagulant

Dissolving calcium nitrate into 15% calcium nitrate water solution by using hot water at 70-80 ℃, then sequentially adding light calcium powder, a defoaming agent and a surfactant, and uniformly stirring, wherein the calcium nitrate water solution comprises the following components in parts by weight: 15 parts of calcium nitrate, 2 parts of light calcium powder, 0.1 part of defoaming agent (the examples 1-4 are all organic silicon defoaming agents), and 0.3 part of surfactant peregal O; and filtering the prepared coagulant through thick filter cloth to a coagulant tank of a production line for later use, wherein in order to avoid the precipitation of light calcium powder in the coagulant, a coagulant tank circulating device is opened, and the coagulant needs to be continuously circulated in the coagulant tank.

4. Pickling and alkali soaking of a mould, cleaning by a spraying rolling brush, preheating by using cleaned mould soaking water, wherein a calcium nitrate water solution with the calcium content of 9-10% is arranged in a water tank, and the temperature is =70 ℃;

5. preheating a mould, immersing the mould into a coagulant tank, wherein 15% of calcium nitrate coagulant is contained in the coagulant tank, the temperature is 58 ℃, and then drying the mould through a coagulant drying furnace at the drying temperature of 80 DEG C

6. Dipping the dried mould into a glue tank filled with the mixed and matched latex in the step S1 for glue dipping, wherein the temperature in the glue tank is 26 ℃, and then, carrying out glue film shaping on the mould through a glue film shaping furnace, wherein the temperature in the glue film shaping furnace is 100 ℃;

7. carrying out hot water leaching on the mold with the adhesive film after the adhesive film is shaped, wherein the temperature of the leached water is 45 ℃, then drying the mold through an adhesive film drying furnace, wherein the temperature in the adhesive film drying furnace is 90 ℃, and curling the dried adhesive film;

8. performing film vulcanization on the curled film through a film vulcanization furnace, wherein the temperature in the film vulcanization furnace is 110 ℃;

9. naturally cooling the rubber film after the rubber film is completely vulcanized, and then cooling the rubber film by cooling water, wherein the water temperature of a cooling water tank is not higher than 45 ℃;

10. sequentially immersing the cooled adhesive film into 800PPm chlorine water and 10% potassium hydroxide aqueous solution with the pH value of 10, wherein the temperatures of the chlorine water and the potassium hydroxide aqueous solution are not higher than 43 ℃;

11. and (3) after the rubber film soaked in 800PPm chlorine water and 10% potassium hydroxide water solution passes through a drying furnace, removing the rubber film from the mold, and thus completing the preparation of the latex-mixed medical glove.

Example 2

A preparation method of the mixed latex medical gloves comprises the following steps:

1. preparing raw materials such as a sulfur dispersion, an anti-aging agent dispersion, a zinc oxide dispersion, a zinc Butyldithiocarbamate (BZ) dispersion and the like, wherein the raw materials comprise the following components:

preparing a sulfur dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and sulfur into a grinding machine, and grinding for 36 hours to obtain a sulfur dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of sulfur, 0.1 part of potassium hydroxide, 5.0 parts of dispersing agent NF and 94.9 parts of softened water are prepared into a sulfur dispersion with the mass percentage of 50 percent of sulfur.

Preparing an anti-aging agent dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and an anti-aging agent WL into a grinding machine, and grinding for 36 hours to obtain an anti-aging agent dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein 100 parts of anti-aging agent, 0.1 part of potassium hydroxide, 3.0 parts of dispersing agent NF and 146.9 parts of softened water, and the anti-aging agent dispersoid with the mass percentage of the anti-aging agent being 40% is prepared.

Preparing zinc oxide dispersoid, namely adding softened water, a dispersing agent NF and zinc oxide into a grinding machine in sequence, and grinding for 2-4 hours to prepare the zinc oxide dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of zinc oxide, 3.0 parts of dispersing agent NF and 97 parts of softened water; the zinc oxide dispersion with the mass percent of the zinc oxide being 50% is prepared.

Preparing a zinc Butyldithiocarbamate (BZ) dispersion, namely sequentially adding softened water, a dispersing agent NF, potassium hydroxide and BZ into a grinding machine, and grinding for 36 hours to obtain the zinc Butyldithiocarbamate (BZ) dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein 100 parts of zinc Butyldithiocarbamate (BZ), 0.2 part of potassium hydroxide, 3.0 parts of dispersing agent NF and 146.8 parts of softened water are used for preparing the zinc butyldithiocarbamate dispersion with the mass percentage of the zinc butyldithiocarbamate being 40%.

In addition, a potassium hydroxide aqueous solution with a mass percent of potassium hydroxide of 20%, a sodium dibutyldithiocarbamate (TP) solution with a mass percent of sodium dibutyldithiocarbamate of 40%, a titanium white slurry dispersion with a mass percent of titanium white, a defoamer aqueous solution with a mass percent of 5% (all the defoamers used in examples 1 to 4 are silicone defoamers), a butyronitrile latex aqueous solution with a mass percent of butyronitrile latex of 43.5%, a potassium metasilicate solution with a mass percent of potassium metasilicate of 20%, and a natural latex aqueous solution with a mass percent of natural latex of 60% were prepared, respectively.

2. Preparation of a mixed compounded latex: respectively and independently preparing butyronitrile latex and natural latex to respectively obtain butyronitrile matching latex and natural rubber matching latex, mixing 70% of butyronitrile matching latex and 30% of natural rubber matching latex by mass percent, filtering the obtained mixed matching latex into a rubber tank for later use by four layers of nylon cloth, and avoiding the opening of a gel skin rubber tank circulating device of the matching latex in the rubber tank and the continuous circulation of the matching latex in the rubber tank;

① preparation of butyronitrile complex latex, under the condition of stirring, 20% potassium hydroxide aqueous solution, 50% sulfur dispersion, 40% sodium dibutyldithiocarbamate (TP) solution, 50% zinc oxide dispersion, 40% antioxidant dispersion, 70% titanium white slurry dispersion and 5% defoamer aqueous solution are sequentially added into 43.5% butyronitrile latex, wherein, the butyronitrile latex comprises 100 parts by weight of butyronitrile latex, 1.0 part by weight of KOH, 2.0 parts by weight of sulfur, 3.0 parts by weight of sodium dibutyldithiocarbamate (TP), 4.0 parts by weight of zinc oxide (ZnO), 0.5 part by weight of antioxidant, 0.5 part by weight of titanium white and 0.2 part by weight of defoamer.

② Natural rubber latex is prepared by sequentially adding 20% potassium hydroxide aqueous solution, 20% potassium metasilicate solution, 50% sulfur dispersion, 40% zinc Butyldithiocarbamate (BZ) dispersion, 50% zinc oxide dispersion, 40% antioxidant dispersion and 5% defoamer aqueous solution into 60% natural rubber latex under stirring, wherein the natural rubber latex comprises, by weight, 100 parts of natural rubber latex, 3.0 parts of KOH, 0.1 part of potassium Butyldithiocarbamate (BZ), 1.0 part of sulfur, 0.5 part of zinc Butyldithiocarbamate (BZ), 1.5 parts of zinc oxide (ZnO), 0.5 part of antioxidant and 0.5 part of defoamer.

3. Preparation of the coagulant

Dissolving calcium nitrate into 15% calcium nitrate water solution by using hot water at 70-80 ℃, then sequentially adding light calcium powder, a defoaming agent and a surfactant, and uniformly stirring, wherein the calcium nitrate water solution comprises the following components in parts by weight: 15 parts of calcium nitrate, 2 parts of light calcium powder, 0.1 part of defoaming agent (the examples 1-4 are all organic silicon defoaming agents), and 0.3 part of surfactant peregal O; and filtering the prepared coagulant through thick filter cloth to a coagulant tank of a production line for later use, wherein in order to avoid the precipitation of light calcium powder in the coagulant, a coagulant tank circulating device is opened, and the coagulant needs to be continuously circulated in the coagulant tank.

4. Pickling and alkali soaking of a mould, cleaning by a spraying rolling brush, preheating by using cleaned mould soaking water, wherein a calcium nitrate water solution with the calcium content of 9-10% is arranged in a water tank, and the temperature is =70 ℃;

5. preheating a mould, immersing the mould into a coagulant tank, wherein 15% of calcium nitrate coagulant is contained in the coagulant tank, the temperature is 58 ℃, and then drying the mould through a coagulant drying furnace at the drying temperature of 80 DEG C

6. Dipping the dried mould into a glue tank filled with the mixed and matched latex in the step S1 for glue dipping, wherein the temperature in the glue tank is 26 ℃, and then, carrying out glue film shaping on the mould through a glue film shaping furnace, wherein the temperature in the glue film shaping furnace is 100 ℃;

7. carrying out hot water leaching on the mold with the adhesive film after the adhesive film is shaped, wherein the temperature of the leached water is 45 ℃, then drying the mold through an adhesive film drying furnace, wherein the temperature in the adhesive film drying furnace is 90 ℃, and curling the dried adhesive film;

8. performing film vulcanization on the curled film through a film vulcanization furnace, wherein the temperature in the film vulcanization furnace is 110 ℃;

9. naturally cooling the rubber film after the rubber film is completely vulcanized, and then cooling the rubber film by cooling water, wherein the water temperature of a cooling water tank is not higher than 45 ℃;

10. sequentially immersing the cooled adhesive film into 800PPm chlorine water and 10% potassium hydroxide aqueous solution with the pH value of 10, wherein the temperatures of the chlorine water and the potassium hydroxide aqueous solution are not higher than 43 ℃;

11. and (3) after the rubber film soaked in 800PPm chlorine water and 10% potassium hydroxide water solution passes through a drying furnace, removing the rubber film from the mold, and thus completing the preparation of the latex-mixed medical glove.

Example 3

A preparation method of the mixed latex medical gloves comprises the following steps:

1. preparing a sulfur dispersion, an anti-aging agent dispersion, a zinc oxide dispersion and a zinc Butyldithiocarbamate (BZ) dispersion, which are as follows:

preparing a sulfur dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and sulfur into a grinding machine, and grinding for 36 hours to obtain a sulfur dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of sulfur, 0.5 part of potassium hydroxide, 3.0 parts of dispersing agent NF and 96.5 parts of softened water are prepared into a sulfur dispersion with the mass percentage of 50 percent of sulfur.

Preparing an anti-aging agent dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and an anti-aging agent WL into a grinding machine, and grinding for 36 hours to obtain an anti-aging agent dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of anti-aging agent, 0.3 part of potassium hydroxide, 5.0 parts of dispersing agent NF and 144.7 parts of softened water are prepared into the anti-aging agent dispersoid with the mass percentage of the anti-aging agent of 40 percent.

Preparing zinc oxide dispersoid, namely adding softened water, a dispersing agent NF and zinc oxide into a grinding machine in sequence, and grinding for 2-4 hours to prepare the zinc oxide dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of zinc oxide, 5.0 parts of dispersing agent NF and 95 parts of softened water; the zinc oxide dispersion with the mass percent of the zinc oxide being 50% is prepared.

Preparing a zinc Butyldithiocarbamate (BZ) dispersion, namely sequentially adding softened water, a dispersing agent, potassium hydroxide and BZ into a grinding machine, and grinding for 36 hours to obtain the zinc Butyldithiocarbamate (BZ) dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein 100 parts of zinc Butyldithiocarbamate (BZ), 0.5 part of potassium hydroxide, 5.0 parts of dispersant and 144.5 parts of softened water are used for preparing the zinc butyldithiocarbamate dispersion with the mass percent of the zinc butyldithiocarbamate being 40%.

In addition, a potassium hydroxide aqueous solution with the mass percent of potassium hydroxide being 20%, a sodium dibutyldithiocarbamate (TP) solution with the mass percent of sodium dibutyldithiocarbamate being 40%, a titanium white slurry dispersoid with the mass percent of titanium white being 70%, an antifoaming agent aqueous solution with the mass percent of antifoaming agent being 5%, an acrylonitrile butadiene latex aqueous solution with the mass percent of acrylonitrile butadiene latex being 43.5%, a potassium metasilicate solution with the mass percent of potassium metasilicate being 20%, and a natural latex aqueous solution with the mass percent of natural latex being 60% are respectively prepared.

2. Preparation of a mixed compounded latex: respectively and independently preparing butyronitrile latex and natural latex to respectively obtain butyronitrile matching latex and natural rubber matching latex, mixing 80% of butyronitrile matching latex and 20% of natural rubber matching latex by mass percent, filtering the obtained mixed matching latex into a rubber tank by four layers of nylon cloth for later use, and avoiding the opening of a gel skin rubber tank circulating device of the matching latex in the rubber tank and the continuous circulation of the matching latex in the rubber tank;

① preparation of butyronitrile complex latex, 20% potassium hydroxide aqueous solution, 50% sulfur dispersion, 40% sodium dibutyldithiocarbamate (TP) solution, 50% zinc oxide dispersion, 40% antioxidant dispersion, 70% titanium white slurry dispersion, 5% defoamer aqueous solution are added to 43.5% butyronitrile latex in sequence under the condition of stirring, wherein, the butyronitrile latex comprises 100 parts by weight of butyronitrile latex, 2.0 parts by weight of KOH (examples 1 to 4 are all a stabilizer), 4.0 parts by weight of sulfur, 1.0 part by weight of sodium dibutyldithiocarbamate (TP), 2.0 parts by weight of zinc oxide (ZnO), 2.5 parts by weight of antioxidant, 1.0 part by weight of titanium white, and 0.8 part by weight of defoamer.

② Natural rubber latex is prepared by sequentially adding 20% potassium hydroxide aqueous solution, 20% potassium metasilicate solution, 50% sulfur dispersion, 40% zinc Butyldithiocarbamate (BZ) dispersion, 50% zinc oxide dispersion, 40% antioxidant dispersion and 5% defoamer aqueous solution into 60% natural rubber latex under stirring, wherein the natural rubber latex comprises, by weight, 100 parts of natural rubber latex, 1.0 part of KOH, 0.5 part of potassium butyldithiocarbamate, 3.0 parts of sulfur, 1.5 parts of zinc Butyldithiocarbamate (BZ), 2.5 parts of zinc oxide (ZnO), 2.5 parts of antioxidant and 0.1 part of defoamer.

3. Preparation of the coagulant

Dissolving calcium nitrate into a 16% calcium nitrate water solution by using hot water at 70-80 ℃, then sequentially adding light calcium powder, a defoaming agent and a surfactant, and uniformly stirring, wherein the calcium nitrate is prepared from the following components in parts by weight: 16 parts of calcium nitrate, 6 parts of light calcium powder, 0.5 part of defoaming agent and 0.6 part of surfactant peregal O; and filtering the prepared coagulant through thick filter cloth to a coagulant tank of a production line for later use, wherein in order to avoid the precipitation of light calcium powder in the coagulant, a coagulant tank circulating device is opened, and the coagulant needs to be continuously circulated in the coagulant tank.

4. Pickling and alkali soaking of a die, cleaning by a spraying rolling brush, preheating by using cleaned die soaking water, wherein a calcium nitrate water solution with the calcium content of 9-10% is arranged in a water tank, and the temperature is =65 ℃;

5. preheating a mould, immersing the mould into a coagulant tank, wherein 15% of calcium nitrate coagulant is contained in the coagulant tank, the temperature is 60 ℃, and then drying the mould through a coagulant drying furnace at the drying temperature of 100 DEG C

6. Dipping the dried mould into a glue tank filled with the mixed and matched latex in the step S1 for gum dipping, wherein the temperature in the glue tank is 28 ℃, and then, carrying out glue film shaping on the mould through a glue film shaping furnace, wherein the temperature in the glue film shaping furnace is 120 ℃;

7. carrying out hot water leaching on the mold with the adhesive film after the adhesive film is shaped, wherein the temperature of the leached water is 50 ℃, then drying the mold through an adhesive film drying furnace, wherein the temperature in the adhesive film drying furnace is 110 ℃, and curling the dried adhesive film;

8. performing film vulcanization on the curled film through a film vulcanization furnace, wherein the temperature in the film vulcanization furnace is 130 ℃;

9. naturally cooling the rubber film after the rubber film is completely vulcanized, and then cooling the rubber film by cooling water, wherein the water temperature of a cooling water tank is not higher than 45 ℃;

10. the cooled adhesive film is sequentially immersed into 800PPm chlorine water and 10% potassium hydroxide (mass percentage in the whole text) aqueous solution with the pH value of 10, and the temperature of the chlorine water and the potassium hydroxide aqueous solution is not higher than 43 ℃;

11. and (3) after the rubber film soaked in 800PPm chlorine water and 10% potassium hydroxide water solution passes through a drying furnace, removing the rubber film from the mold, and thus completing the preparation of the latex-mixed medical glove.

Example 4

A preparation method of the mixed latex medical gloves comprises the following steps:

1. preparing a sulfur dispersion, an anti-aging agent dispersion, a zinc oxide dispersion and a zinc Butyldithiocarbamate (BZ) dispersion, which are as follows:

preparing a sulfur dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and sulfur into a grinding machine, and grinding for 36 hours to obtain a sulfur dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of sulfur, 0.5 part of potassium hydroxide, 3.0 parts of dispersing agent NF and 96.5 parts of softened water are prepared into a sulfur dispersion with the mass percentage of 50 percent of sulfur.

Preparing an anti-aging agent dispersion: sequentially adding softened water, a dispersing agent NF, potassium hydroxide and an anti-aging agent WL into a grinding machine, and grinding for 36 hours to obtain an anti-aging agent dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of anti-aging agent, 0.3 part of potassium hydroxide, 5.0 parts of dispersing agent NF and 144.7 parts of softened water are prepared into the anti-aging agent dispersoid with the mass percentage of the anti-aging agent of 40 percent.

Preparing zinc oxide dispersoid, namely adding softened water, a dispersing agent NF and zinc oxide into a grinding machine in sequence, and grinding for 2-4 hours to prepare the zinc oxide dispersoid; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein, 100 parts of zinc oxide, 5.0 parts of dispersing agent NF and 95 parts of softened water; the zinc oxide dispersion with the mass percent of the zinc oxide being 50% is prepared.

Preparing a zinc Butyldithiocarbamate (BZ) dispersion, namely sequentially adding softened water, a dispersing agent, potassium hydroxide and BZ into a grinding machine, and grinding for 36 hours to obtain the zinc Butyldithiocarbamate (BZ) dispersion; the rotating speed of the grinder is 300-400 r/m, the diameter of the glass sand in the grinder is 3-5mm, and the volume of the glass sand accounts for 1/2 of the volume of the grinder; wherein 100 parts of zinc Butyldithiocarbamate (BZ), 0.5 part of potassium hydroxide, 5.0 parts of dispersant and 144.5 parts of softened water are used for preparing the zinc butyldithiocarbamate dispersion with the mass percent of the zinc butyldithiocarbamate being 40%.

In addition, a potassium hydroxide aqueous solution with the mass percent of potassium hydroxide being 20%, a sodium dibutyldithiocarbamate (TP) solution with the mass percent of sodium dibutyldithiocarbamate being 40%, a titanium white slurry dispersoid with the mass percent of titanium white being 70%, an antifoaming agent aqueous solution with the mass percent of antifoaming agent being 5%, an acrylonitrile butadiene latex aqueous solution with the mass percent of acrylonitrile butadiene latex being 43.5%, a potassium metasilicate solution with the mass percent of potassium metasilicate being 20%, and a natural latex aqueous solution with the mass percent of natural latex being 60% are respectively prepared.

2. Preparation of a mixed compounded latex: respectively and independently preparing butyronitrile latex and natural latex to respectively obtain butyronitrile matching latex and natural rubber matching latex, mixing 70% of butyronitrile matching latex and 30% of natural rubber matching latex by mass percent, filtering the obtained mixed matching latex into a rubber tank for later use by using four layers of nylon cloth, and avoiding the opening of a gel skin rubber tank circulating device of the matching latex in the rubber tank and the continuous circulation of the matching latex in the rubber tank;

① preparation of butyronitrile complex latex, 20% potassium hydroxide aqueous solution, 50% sulfur dispersion, 40% sodium dibutyldithiocarbamate (TP) solution, 50% zinc oxide dispersion, 40% antioxidant dispersion, 70% titanium white slurry dispersion, 5% defoamer aqueous solution are added to 43.5% butyronitrile latex in sequence under the condition of stirring, wherein, the butyronitrile latex comprises 100 parts by weight of butyronitrile latex, 2.0 parts by weight of KOH (examples 1 to 4 are all a stabilizer), 4.0 parts by weight of sulfur, 1.0 part by weight of sodium dibutyldithiocarbamate (TP), 2.0 parts by weight of zinc oxide (ZnO), 2.5 parts by weight of antioxidant, 1.0 part by weight of titanium white, and 0.8 part by weight of defoamer.

② Natural rubber latex is prepared by sequentially adding 20% potassium hydroxide aqueous solution, 20% potassium metasilicate solution, 50% sulfur dispersion, 40% zinc Butyldithiocarbamate (BZ) dispersion, 50% zinc oxide dispersion, 40% antioxidant dispersion and 5% defoamer aqueous solution into 60% natural rubber latex under stirring, wherein the natural rubber latex comprises, by weight, 100 parts of natural rubber latex, 1.0 part of KOH, 0.5 part of potassium butyldithiocarbamate, 3.0 parts of sulfur, 1.5 parts of zinc Butyldithiocarbamate (BZ), 2.5 parts of zinc oxide (ZnO), 2.5 parts of antioxidant and 0.1 part of defoamer.

3. Preparation of the coagulant

Dissolving calcium nitrate into a 16% calcium nitrate water solution by using hot water at 70-80 ℃, then sequentially adding light calcium powder, a defoaming agent and a surfactant, and uniformly stirring, wherein the calcium nitrate is prepared from the following components in parts by weight: 16 parts of calcium nitrate, 6 parts of light calcium powder, 0.5 part of defoaming agent and 0.6 part of surfactant peregal O; and filtering the prepared coagulant through thick filter cloth to a coagulant tank of a production line for later use, wherein in order to avoid the precipitation of light calcium powder in the coagulant, a coagulant tank circulating device is opened, and the coagulant needs to be continuously circulated in the coagulant tank.

4. Pickling and alkali soaking of a die, cleaning by a spraying rolling brush, preheating by using cleaned die soaking water, wherein a calcium nitrate water solution with the calcium content of 9-10% is arranged in a water tank, and the temperature is =65 ℃;

5. preheating a mould, immersing the mould into a coagulant tank, wherein 15% of calcium nitrate coagulant is contained in the coagulant tank, the temperature is 60 ℃, and then drying the mould through a coagulant drying furnace at the drying temperature of 100 DEG C

6. Dipping the dried mould into a glue tank filled with the mixed and matched latex in the step S1 for gum dipping, wherein the temperature in the glue tank is 28 ℃, and then, carrying out glue film shaping on the mould through a glue film shaping furnace, wherein the temperature in the glue film shaping furnace is 120 ℃;

7. carrying out hot water leaching on the mold with the adhesive film after the adhesive film is shaped, wherein the temperature of the leached water is 50 ℃, then drying the mold through an adhesive film drying furnace, wherein the temperature in the adhesive film drying furnace is 110 ℃, and curling the dried adhesive film;

8. performing film vulcanization on the curled film through a film vulcanization furnace, wherein the temperature in the film vulcanization furnace is 130 ℃;

9. naturally cooling the rubber film after the rubber film is completely vulcanized, and then cooling the rubber film by cooling water, wherein the water temperature of a cooling water tank is not higher than 45 ℃;

10. sequentially immersing the cooled adhesive film into 800PPm chlorine water and 10% potassium hydroxide aqueous solution with the pH value of 10, wherein the temperatures of the chlorine water and the potassium hydroxide aqueous solution are not higher than 43 ℃;

11. and (3) after the rubber film soaked in 800PPm chlorine water and 10% potassium hydroxide water solution passes through a drying furnace, removing the rubber film from the mold, and thus completing the preparation of the latex-mixed medical glove.

Example 5

Examples 1 and 2 only differ in the proportions of nitrile latex and natural latex, the other conditions being the same, examples 3 and 4 also differ only in the proportions of nitrile latex and natural latex, examples 1 and 3 are 80% nitrile latex, 20% natural latex, examples 2 and 4 are 70% nitrile latex and 30% natural latex, six gloves prepared by the process of examples 1 to 4 were tested, respectively, and the results were as follows: ) Experimental data relating to oil resistance and the like, including but not limited to tensile strength, elongation, and the like, in comparative document 1, were supplemented.

Table 1 physical property testing of example 1 and example 3

Table 2 physical property testing of example 2 and example 4

The macromolecular chain structural unit of the natural latex is isoprene; the nitrile latex is latex prepared by emulsion polymerization of butadiene and acrylonitrile. The two latexes are completely different in structure, the two latexes are independently prepared, different stabilizers and vulcanization accelerators are added according to the properties of the latexes, and then the prepared butyronitrile complex latex and the natural latex complex latex are matched according to different proportions, so that the two latexes are continuously stable in the production process, and the vulcanization speed of a glue film is consistent in the vulcanization process. The result also shows that the stretch breaking extensibility is better, so the elasticity is good, the wearing resistance is better, and the product is more stable; the addition of the butyronitrile latex ensures that the oil-resistant effect of the glove is good.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. The preparation method of the mixed latex medical gloves is characterized by comprising the following steps:

s1, preparing mixed compound latex: separately preparing two kinds of latexes with different properties into compound latexes, and then mixing and filtering the prepared two kinds of compound latexes into a glue tank for later use according to a proportion;

s2, hybrid latex medical gloves are prepared using the hybrid compounded latex prepared in step S1.

2. The method of making latex hybrid medical gloves of claim 1, wherein the two latexes are nitrile latex and natural latex, respectively.

3. The method of preparing latex blend medical gloves according to claim 2, wherein the method of preparing the nitrile-butadiene latex and the natural rubber latex is as follows:

① preparation of butyronitrile complex latex, sequentially adding 20% potassium hydroxide aqueous solution, 50% sulfur dispersion, 40% sodium dibutyldithiocarbamate (TP) solution, 50% zinc oxide dispersion, 40% antioxidant dispersion, 70% titanium white slurry dispersion and 5% defoamer aqueous solution into 43.5% butyronitrile latex under stirring;

② preparation of natural rubber latex, 20% potassium hydroxide solution, 20% potassium metasilicate solution, 50% sulphur dispersion, 40% zinc Butyldithiocarbamate (BZ) dispersion, 50% zinc oxide dispersion, 40% antioxidant dispersion and 5% defoamer solution are added into 60% natural rubber latex in sequence under stirring.

4. The method for preparing the mixed latex medical gloves according to claim 3, wherein the raw materials in the butyronitrile mixed latex and the natural rubber mixed latex are respectively as follows according to parts by weight:

nitrile butadiene latex compounding:

100 parts of butyronitrile latex;

1.0-2.0 parts of KOH;

2.0-4.0 parts of sulfur;

1.0-3.0 parts of TP;

2.0-4.0 parts of ZnO;

0.5-2.5 parts of anti-aging agent;

0.5-1.0 part of titanium dioxide;

0.2-0.8 part of defoaming agent;

matching natural rubber with latex:

100 parts of natural latex;

1.0-3.0 parts of KOH;

0.1-0.5 part of potassium metasilicate;

1.0-3.0 parts of sulfur;

0.5-1.5 parts of BZ;

1.5-2.5 parts of ZnO;

0.5-2.5 parts of anti-aging agent;

0.1-0.5 part of defoaming agent.

5. The method for preparing the latex mixed medical gloves according to claim 4, wherein the mass percentages of the butyronitrile mixed latex and the natural rubber mixed latex in the mixed latex are as follows:

nitrile butadiene latex compounding: 70% -80%;

matching natural rubber with latex: 20 to 30 percent.

6. The method of preparing latex hybrid medical gloves of claim 3, wherein the sulfur dispersion, the antioxidant dispersion, the zinc oxide dispersion, and the zinc butyldithiocarbamate dispersion are prepared as follows:

sulfur dispersion: 100 parts of sulfur, 0.1-0.5 part of potassium hydroxide and 3.0-5.0 parts of dispersing agent NF; sequentially adding sulfur, potassium hydroxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain a sulfur dispersion;

anti-aging agent dispersion: 100 parts of anti-aging agent WL, 0.1-0.3 part of potassium hydroxide and 3.0-5.0 parts of dispersing agent NF; sequentially adding an anti-aging agent WL, potassium hydroxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain an anti-aging agent dispersoid;

zinc Butyldithiocarbamate (BZ) dispersion: 100 parts of zinc Butyldithiocarbamate (BZ), 0.2-0.5 part of potassium hydroxide and 3.0-5.0 parts of dispersing agent NF; sequentially adding zinc Butyldithiocarbamate (BZ), potassium hydroxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain a zinc Butyldithiocarbamate (BZ) dispersion;

zinc oxide dispersion: 100 parts of zinc oxide and 3.0-5.0 parts of dispersing agent NF; and sequentially adding zinc oxide, a dispersing agent NF and softened water into a grinding machine, and grinding for 36 hours to obtain the zinc oxide dispersoid.

7. The method for preparing the latex blend medical gloves according to claim 3, wherein the step S2 is as follows:

(1) preheating the cleaned die by soaking in hot water, wherein the water tank is a calcium nitrate water solution with the calcium content of 9-10%, and the temperature is more than or equal to 65 ℃;

(2) preheating a mould, and then immersing the mould into a coagulant tank, wherein the coagulant tank is internally provided with 15-16% of calcium nitrate coagulant at the temperature of 58-60 ℃, and then drying the mould in a coagulant drying furnace at the drying temperature of 80-100 ℃;

(3) dipping the dried mould into a glue tank filled with the mixed matching latex in the step S1 for glue dipping, wherein the temperature in the glue tank is 26-28 ℃, and then carrying out glue film shaping on the mould through a glue film shaping furnace, wherein the temperature in the glue film shaping furnace is 100-120 ℃;

(4) carrying out hot water leaching on the mold with the adhesive film after the adhesive film is shaped, wherein the temperature of the leached water is 45-50 ℃, then drying the mold through an adhesive film drying furnace, wherein the temperature in the adhesive film drying furnace is 90-110 ℃, and curling the dried adhesive film;

(5) vulcanizing the rolled adhesive film in an adhesive film vulcanizing furnace at the temperature of 110-130 ℃;

(6) naturally cooling the rubber film after the rubber film is completely vulcanized, and then cooling the rubber film by cooling water, wherein the water temperature of a cooling water tank is not higher than 45 ℃;

(7) sequentially immersing the cooled adhesive film into 800PPm chlorine water and 10% potassium hydroxide aqueous solution with the pH value of 10-13, wherein the temperatures of the chlorine water and the potassium hydroxide aqueous solution are not higher than 43 ℃;

(8) and (3) after the rubber film soaked in 800PPm chlorine water and 10% potassium hydroxide water solution passes through a drying furnace, removing the rubber film from the mold, and thus completing the preparation of the latex-mixed medical glove.

8. The method of preparing mixed latex medical gloves of claim 7, wherein the coagulant in step (2) is prepared as follows:

dissolving calcium nitrate into 15-16% calcium nitrate water solution by using hot water at 70-80 ℃, then sequentially adding light calcium powder, a defoaming agent and a surfactant peregal O, and uniformly stirring for later use, wherein the calcium nitrate water solution comprises the following components in parts by weight: 15-16 parts of calcium nitrate, 2-6 parts of light calcium powder, 0.1-0.5 part of defoaming agent and 0.3-0.6 part of surfactant peregal O.