CN113001848A - Preparation method of medical gloves with uniform thickness - Google Patents
Preparation method of medical gloves with uniform thickness Download PDFInfo
- Publication number
- CN113001848A CN113001848A CN202110206679.XA CN202110206679A CN113001848A CN 113001848 A CN113001848 A CN 113001848A CN 202110206679 A CN202110206679 A CN 202110206679A CN 113001848 A CN113001848 A CN 113001848A
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- Prior art keywords
- coagulant
- mold
- mould
- concentration
- drying
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/14—Dipping a core
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
- C08L7/02—Latex
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4842—Outerwear
- B29L2031/4864—Gloves
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Gloves (AREA)
Abstract
The invention provides a preparation method of medical gloves with uniform thickness, which comprises the following steps: s1, vertically immersing the mould into the high-concentration coagulant I; and S2, vertically immersing the mold attached with the first coagulant in a second coagulant with low concentration, horizontally or nearly horizontally taking out the mold, and drying the mold. According to the invention, the mold is immersed into the high-concentration coagulant I, the finger part and the palm part have the high-concentration coagulant I, then the mold attached with the coagulant I is immersed into the low-concentration coagulant II to form a concentration gradient, the concentration gradient causes the high-concentration solute to rapidly diffuse towards the low-concentration direction, and dynamic balance is achieved within a short time, so that the thicknesses of the coagulants attached to the wrist part, the palm part and the finger part are relatively uniform, and therefore, when latex is impregnated, the thickness of the rubber film is relatively uniform, and the thickness of the prepared glove is relatively uniform.
Description
Technical Field
The invention relates to the technical field, in particular to a preparation method of medical gloves with uniform thickness.
Background
At present, the method of dipping a coagulant is often adopted for producing medical gloves at home and abroad, and ions with positive charges in the coagulant are combined with anions on the surface of rubber particles to quickly generate substances which are not easy to dissociate, so that colloidal particles lose charges and are coagulated. By adopting a coagulant dipping method, a mould is generally vertically dipped into a coagulant and then vertically taken out, the finger part of the mould is dipped in the coagulant for the longest time, and the action of gravity causes the concentration of the coagulant attached to the finger part to be the largest, and when latex is dipped, the latex film on the finger part is the thickest, so that the thickness of the finger part, the palm part and the wrist part of a pair of gloves is uneven, poor touch feeling is brought to a user, and the thinner thickness of the wrist part area reduces the strength and destroys the integrity of the latex film, so that the gloves are easy to tear during wearing.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a preparation method of medical gloves with uniform thickness, which comprises the following steps:
s1, vertically immersing the mould into the high-concentration coagulant I;
and S2, vertically immersing the mould attached with the first coagulant into a second coagulant with low concentration, then horizontally or nearly horizontally taking out the mould, and drying the mould, wherein the highest point of the second coagulant is positioned below the wrist part of the mould.
Further, the mass percentage concentration of the calcium salt in the coagulant I is 14-18%, and the mass percentage concentration of the calcium salt in the coagulant II is 8-13%.
Further, in step S1, the residence time of the mold in the first coagulant is 3 to 8 seconds; in step S2, the residence time of the mold in the second coagulant is 5-8 seconds.
Further, the distance between the highest point of the second coagulant dipping and the lowest end of the wrist part is 30-60 mm.
Further, step S1 is preceded by cleaning the mold and immersing the mold after cleaning in a mold release agent.
Further, in step S2, after the mold is taken out of the second solidifying agent, the method includes the following steps:
s3, soaking the mold into latex after drying, and taking out and drying the mold attached with the latex;
s4, immersing the dried mould with the latex into the coating, taking out, drying and vulcanizing;
and S5, immersing the mold with the coating after drying and vulcanization into hot water, taking out, drying and demolding.
Further, in the step 1), the latex comprises the following raw materials in parts by weight: 100 parts of natural latex, 10 parts of accelerator, 10 parts of vulcanizing agent, 2 parts of anti-aging agent and 2 parts of defoaming agent.
The invention vertically immerses the mould into the high-concentration coagulant I and vertically takes out the mould, the finger part and the palm part have the high-concentration coagulant I, then vertically immerses the mould attached with the coagulant I into the low-concentration coagulant II to form a concentration gradient, the concentration gradient causes the high-concentration solute to rapidly diffuse towards the low-concentration direction, and dynamic balance is achieved in a short time, so that the thicknesses of the coagulants attached to the wrist part, the palm part and the finger part are relatively uniform, and the mould is horizontally or nearly horizontally taken out, so that the thicknesses of glue films are relatively uniform when latex is impregnated, and the thicknesses of the prepared gloves are relatively uniform.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1:
the invention provides a preparation method of medical gloves with uniform thickness, which comprises the following steps:
(1) cleaning the mold, immersing the cleaned mold into a mold release agent, and then taking out and drying;
(2) vertically immersing the dried mould into a high-concentration coagulant I, wherein the temperature of the coagulant I is 65 ℃, and the time for which the mould stays in the coagulant I is 8 seconds;
(3) vertically immersing the mould attached with the first coagulant into a second coagulant with low concentration, wherein the temperature of the second coagulant is 60 ℃, the stay time of the mould in the second coagulant is 8 seconds, the distance between the highest point of the second coagulant impregnation and the lowest end of the wrist part of the mould is 60mm, then rotating the mould to face, and finally taking out the mould in the horizontal direction;
(4) drying the mould attached with the second coagulant, then immersing the mould into latex, wherein the temperature of the latex is 40 ℃, the residence time of the mould in the latex is 15 seconds, taking out the mould attached with the latex, drying, then immersing the dried mould into softened water, performing pre-leaching to form a pre-leached latex film, then taking out, drying, wherein the pre-leaching duration is 30 seconds, and the temperature of the softened water is 80 ℃;
(5) immersing the dried mould with the pre-leached latex film into the coating, wherein the stay time of the mould in the coating is 12 seconds, and then curling the pre-leached latex film to form a curled latex film;
(6) drying and vulcanizing the mold with the curled latex film, and then immersing the mold with the curled latex film after drying and vulcanizing into hot water, wherein the temperature of the hot water is 80 ℃, and the residence time of the mold in the hot water is 20 seconds;
(7) taking out the mold in hot water, soaking the mold in a release agent, taking out, drying, and demolding, wherein the temperature of the release agent is 65 ℃, and the residence time of the mold in the release agent is 12 seconds.
Wherein the latex comprises the following raw materials in parts by weight: 100 parts of natural latex, 10 parts of accelerator, 10 parts of vulcanizing agent, 2 parts of anti-aging agent and 2 parts of defoaming agent;
the coagulant I and the coagulant II comprise calcium salts, wetting agents, shaping agents and water, wherein the mass percentage concentration of the calcium salts is different from that of the coagulant II, the mass percentage concentration of the calcium salts in the coagulant I is 18%, and the mass percentage concentration of the calcium salts in the coagulant II is 13%; the calcium salt is at least one of calcium nitrate, calcium acetate and calcium chloride, the wetting agent is at least one of peregal O solution, penetrant JFC, Tween-20, Tween-40, Tween-60 and Tween-80, and the excipient is at least one of starch, glycerol, peach gum, carboxymethyl cellulose and methyl cellulose;
the release agent is at least one of calcium stearate, potassium stearate and zinc stearate;
the coating is a water-soluble PU1536 coating of Beijing difen Temmit;
the release agent is 1627 type release agent of Beijing difen corporation.
Example 2:
the invention provides a preparation method of medical gloves with uniform thickness, which comprises the following steps:
(1) cleaning the mold, immersing the cleaned mold into a mold release agent, and then taking out and drying;
(2) vertically immersing the dried mould into a high-concentration coagulant I, wherein the temperature of the coagulant I is 50 ℃, and the time for which the mould stays in the coagulant I is 5 seconds;
(3) vertically immersing the mould attached with the first coagulant into a second coagulant with low concentration, wherein the temperature of the second coagulant is 50 ℃, the stay time of the mould in the second coagulant is 6 seconds, the distance between the highest point of the second coagulant impregnation and the lowest end of the wrist part of the mould is 45mm, then rotating the mould to face, and finally taking out the mould in the horizontal direction;
(4) drying the mould attached with the second coagulant, then immersing the mould into latex at the temperature of 30 ℃, wherein the residence time of the mould in the latex is 12 seconds, taking out the mould attached with the latex, drying, then immersing the dried mould into softened water for pre-leaching to form a pre-leached latex film, then taking out the mould and drying, wherein the pre-leaching duration is 20 seconds, and the temperature of the softened water is 75 ℃;
(5) immersing the dried mould with the pre-leached latex film into the coating, wherein the stay time of the mould in the coating is 10 seconds, and then curling the pre-leached latex film to form a curled latex film;
(6) drying and vulcanizing the mold with the curled latex film, and then immersing the mold with the curled latex film after drying and vulcanizing into hot water, wherein the temperature of the hot water is 75 ℃, and the residence time of the mold in the hot water is 16 seconds;
(7) taking out the mold in hot water, soaking the mold in a release agent, taking out, drying, and demolding, wherein the temperature of the release agent is 60 ℃, and the residence time of the mold in the release agent is 10 seconds.
Wherein the latex comprises the following raw materials in parts by weight: 100 parts of natural latex, 10 parts of accelerator, 10 parts of vulcanizing agent, 2 parts of anti-aging agent and 2 parts of defoaming agent;
the coagulant I and the coagulant II comprise calcium salts, wetting agents, shaping agents and water, wherein the mass percentage concentration of the calcium salts is different from that of the coagulant II, the mass percentage concentration of the calcium salts in the coagulant I is 16%, and the mass percentage concentration of the calcium salts in the coagulant II is 10%; the calcium salt is at least one of calcium nitrate, calcium acetate and calcium chloride, the wetting agent is at least one of peregal O solution, penetrant JFC, Tween-20, Tween-40, Tween-60 and Tween-80, and the excipient is at least one of starch, glycerol, peach gum, carboxymethyl cellulose and methyl cellulose;
the release agent is at least one of calcium stearate, potassium stearate and zinc stearate;
the coating is a water-soluble PU1536 coating of Beijing difen Temmit;
the release agent is 1627 type release agent of Beijing difen corporation.
Example 3:
the invention provides a preparation method of medical gloves with uniform thickness, which comprises the following steps:
(1) cleaning the mold, immersing the cleaned mold into a mold release agent, and then taking out and drying;
(2) vertically immersing the dried mould into a high-concentration coagulant I, wherein the temperature of the coagulant I is 45 ℃, and the time for which the mould stays in the coagulant I is 3 seconds;
(3) vertically immersing the mould attached with the first coagulant into a second coagulant with low concentration, wherein the temperature of the second coagulant is 40 ℃, the time of the mould staying in the second coagulant is 5 seconds, the distance between the highest point of the second coagulant impregnation and the lowest end of the wrist part of the mould is 30mm, then rotating the mould to face, and finally taking out the mould when the mould is close to the horizontal direction;
(4) drying the mould attached with the second coagulant, then immersing the mould into latex at the temperature of 20 ℃, wherein the residence time of the mould in the latex is 8 seconds, taking out the mould attached with the latex, drying, then immersing the dried mould into softened water for pre-leaching to form a pre-leached latex film, then taking out and drying, wherein the pre-leaching duration is 12 seconds, and the temperature of the softened water is 70 ℃;
(5) immersing the dried mould with the pre-leached latex film into the coating, wherein the stay time of the mould in the coating is 8 seconds, and then curling the pre-leached latex film to form a curled latex film;
(6) drying and vulcanizing the mold with the curled latex film, and then immersing the mold with the curled latex film after drying and vulcanizing into hot water, wherein the temperature of the hot water is 70 ℃, and the residence time of the mold in the hot water is 12 seconds;
(7) taking out the mold in hot water, soaking the mold in a release agent, taking out, drying, and demolding, wherein the temperature of the release agent is 60 ℃, and the residence time of the mold in the release agent is 8 seconds.
Wherein the latex comprises the following raw materials in parts by weight: 100 parts of natural latex, 10 parts of accelerator, 10 parts of vulcanizing agent, 2 parts of anti-aging agent and 2 parts of defoaming agent;
the coagulant I and the coagulant II comprise calcium salts, wetting agents, shaping agents and water, wherein the mass percentage concentration of the calcium salts is different from that of the coagulant II, the mass percentage concentration of the calcium salts in the coagulant I is 14%, and the mass percentage concentration of the calcium salts in the coagulant II is 8%; the calcium salt is at least one of calcium nitrate, calcium acetate and calcium chloride, the wetting agent is at least one of peregal O solution, penetrant JFC, Tween-20, Tween-40, Tween-60 and Tween-80, and the excipient is at least one of starch, glycerol, peach gum, carboxymethyl cellulose and methyl cellulose;
the release agent is at least one of calcium stearate, potassium stearate and zinc stearate;
the coating is a water-soluble PU1536 coating of Beijing difen Temmit;
the release agent is 1627 type release agent of Beijing difen corporation.
The thicknesses of the different sized medical gloves prepared according to the present invention were compared with the conventional gloves, and the comparative structures are shown in tables 1 to 3:
TABLE 1
TABLE 2
TABLE 3
As can be seen from tables 1 to 3, the medical gloves prepared according to the present invention have all the thicknesses.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A method for preparing medical gloves with uniform thickness is characterized by comprising the following steps:
s1, vertically immersing the mould into the high-concentration coagulant I;
and S2, vertically immersing the mould attached with the first coagulant into a second coagulant with low concentration, then horizontally or nearly horizontally taking out the mould, and drying the mould, wherein the highest point of the second coagulant is positioned below the wrist part of the mould.
2. The method for preparing medical gloves with uniform thickness according to claim 1, wherein the mass percentage concentration of the calcium salt in the coagulant I is 14-18%, and the mass percentage concentration of the calcium salt in the coagulant II is 8-13%.
3. The method for preparing medical gloves with uniform thickness according to claim 1, wherein in step S1, the mold stays in the coagulant i for 3-8 seconds; in step S2, the residence time of the mold in the second coagulant is 5-8 seconds.
4. The method of manufacturing medical gloves with uniform thickness according to claim 1, wherein the distance between the highest point of the coagulant dip and the lowest end of the wrist part is 30 to 60 mm.
5. The method of claim 1, wherein step S1 is preceded by cleaning the mold and dipping the cleaned mold into a release agent.
6. The method of making medical gloves of claim 1, further comprising the steps of:
s3, soaking the mold into latex after drying, and taking out and drying the mold attached with the latex;
s4, immersing the dried mould with the latex into the coating, taking out, drying and vulcanizing;
and S5, immersing the mold with the coating after drying and vulcanization into hot water, taking out, drying and demolding.
7. The method for preparing medical gloves with uniform thickness according to claim 6, wherein in the step 1), the raw material composition of the latex comprises the following components in parts by weight: 100 parts of natural latex, 10 parts of accelerator, 10 parts of vulcanizing agent, 2 parts of anti-aging agent and 2 parts of defoaming agent.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116619651A (en) * | 2023-06-19 | 2023-08-22 | 广东亿康医疗器械有限公司 | Latex product thickness differential lamination dip forming process |
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| CN110405997A (en) * | 2019-08-28 | 2019-11-05 | 桂林恒保健康防护有限公司 | It is a kind of bilayer medical gloves preparation method and a kind of coagulator |
| CN111073075A (en) * | 2020-01-19 | 2020-04-28 | 山东瑞祥泰劳保用品有限公司 | Preparation method of wear-resistant butyronitrile gloves and wrinkling liquid used in preparation method |
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| CN116619651A (en) * | 2023-06-19 | 2023-08-22 | 广东亿康医疗器械有限公司 | Latex product thickness differential lamination dip forming process |
| CN116619651B (en) * | 2023-06-19 | 2023-11-10 | 广东亿康医疗器械有限公司 | Latex product thickness differential lamination dip forming process |
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