CN101632495B - Preparation method of compound light household rubber gloves - Google Patents

Abstract

The invention provides an improved method for preparing composite light household rubber gloves. The mixed latex of NR and NBR is used as a raw material, including impregnating a coagulant on the glove mold, and impregnating the primary glue, secondary glue, and inner coating in sequence after drying. , when preparing the primary glue, the solid content ratio of NR and NBR is, NR/NBR=20～40/80～60, the solid matter of the latex accounts for the percentage M=96～99% of the solid matter in the primary glue; During the secondary glue, the solid content ratio of NR and NBR is NR/NBR=70～90/10～30, and the solid matter of the latex accounts for the percentage N=66～69% of the solid matter in the secondary glue. Natural rubber-nitrile rubber mixed with latex in different proportions is laminated. The primary rubber layer provides oil resistance, and the secondary rubber layer is used for the connection between the primary rubber layer and the flocking layer, and at the same time provides tensile strength for the entire glove. Because no thickening agent is added, while ensuring the thickening quality, it solves the problem of poor stability of latex after thickening and easy occurrence of colloidal particles, and reduces the thickening cost at the same time.

Description

Preparation method of compound light household rubber gloves

Technical field:

The invention relates to a rubber glove, in particular to a method for preparing a composite light household rubber glove.

Background technique:

Most of the household rubber gloves currently on the market are made of natural rubber or nitrile rubber, which is a single raw material structure. Gloves made of only natural rubber have a good hand feel, but poor oil resistance, and the product is in the air. It is easy to age and cause spray on the surface, which will affect the use and appearance quality of the product. Gloves made of nitrile rubber alone have good oil resistance, but feel stiff and easy to wear.

Household rubber gloves made of a mixture of nitrile rubber and natural rubber. The structure of the glove is specially optimized for wearing comfort. It combines the softness and feel of natural rubber with the oil resistance of nitrile rubber. It prolongs its use and has bright colors. features. It is composed of a three-layer structure including a primary adhesive layer, a secondary adhesive layer, and an inner covering layer.

How to optimize the performance of each layer and how to improve the preparation process and product quality are currently hot topics.

Invention content:

The object of the present invention is to provide an improved method for preparing composite light household rubber gloves, which can optimize the performance of each layer, improve the preparation process by optimizing the formula of the rubber compound, and ensure and improve product quality.

The present invention uses the mixed latex of NR and NBR as a raw material, including impregnating a coagulant on the glove model, and impregnating the primary glue, the secondary glue, and the inner coating in turn after drying. When preparing the primary glue, the solid content ratio of NR and NBR For, NR/NBR=20～40/80～60, the solid matter of the latex accounts for the percentage M=96～99% of the solid matter in the primary glue; when preparing the secondary glue, the solid content ratio of NR and NBR is, NR/ NBR=70～90/10～30, the solid matter of latex accounts for the percentage of solid matter in the secondary glue N=66～69%;

The mass ratio of primary glue ingredients is calculated by solid content, which is:

NR: m=19.2～39.48, NBR: 100M-m,

KOH: 0.1～0.5, ZnO: balance,

Total: 100;

In addition, add the following ingredients according to the mass percentage of primary glue:

Defoamer: 0.05-0.3%, color paste 0.01-0.1%, odor-masking agent: 0.05-0.5%;

The viscosity of the primary glue is: 30 centipoise to 180 centipoise;

The mass ratio of the ingredients of the secondary glue is calculated by solid content, which is:

NR n=46.2～62.1, NBR 100N-n,

KOH and/casein 0.25～0.7, filler balance,

Total: 100;

In addition, add the following ingredients according to the mass percentage of the secondary glue:

0.8-1.2% defoamer, 0.01-0.1% color paste, 0.05-0.5% masking agent;

The viscosity of the secondary glue is: 120 centipoise to 280 centipoise.

The preparation method of the more optimized composite light household rubber gloves is that when preparing the primary glue, the solid content ratio of NR and NBR is NR/NBR=25～35/65～75, and the solid matter of the latex accounts for the solid matter in the primary glue The percentage M=98～99%; when preparing the secondary glue, the solid content ratio of NR and NBR is, NR/NBR=75～85/15～25, the solid matter of the latex accounts for the percentage N of the solid matter in the secondary glue =68～69%;

The mass ratio of primary glue ingredients is calculated by solid content, which is:

NR: m=25.4～34.65, NBR: 100M-m,

KOH: 0.3～0.5, ZnO: balance,

Total: 100;

In addition, add the following ingredients according to the mass percentage of primary glue:

0.05-0.3% defoamer, 0.01-0.1% color paste, 0.05-0.5% masking agent;

The viscosity of primary glue is: 60 centipoise ~ 120 centipoise;

The mass ratio of the ingredients of the secondary glue is calculated by solid content, which is:

NR n=51～58.65, NBR 100N-n,

KOH and/casein 0.3～0.5, filler balance,

Total: 100;

In addition, add the following ingredients according to the mass percentage of the secondary glue:

0.8-1.2% defoamer, 0.01-0.1% color paste, 0.05-0.5% masking agent;

The viscosity of the secondary glue is: 140 centipoise to 230 centipoise.

In the actual production process of the present invention, in order to maintain the viscosity of the secondary glue and stabilize the production process, according to the daily amount of secondary glue, measures are taken to control the replacement amount of the secondary glue. The secondary glue replaces 30% to 60% of the original secondary glue.

The mass ratio of KOH and casein in the secondary glue batching is: 1-2/1. The filler used in the secondary glue is selected from TiO ₂ and calcium carbonate. The filler particle size is: 1-50 microns. The preferred filler particle size is: 20-30 microns.

The present invention uses the elastic polyurethane emulsion as the inner covering layer of the glove, and the elastic polyurethane latex on the inner covering layer is composed of the following components in parts by weight: 5-17 parts of elastic polyurethane with a concentration of 30%; 83-95 parts of soft water.

The present invention uses natural rubber-nitrile rubber mixed with latex in different proportions to carry out lamination. (1) The primary rubber layer provides oil resistance. Most of its components are nitrile rubber with oil resistance, and less are natural rubber that increases the flexibility of the surface rubber layer. (2) The secondary rubber layer acts as a bridge for the connection between the primary rubber layer and the inner covering layer, and at the same time provides tensile strength for the entire glove. Its composition contains less nitrile rubber and more natural rubber. Adding a certain amount of polar nitrile rubber to non-polar natural rubber can increase the polarity of the secondary rubber layer and make it more compatible with the polarity. Stronger toppings bond more tightly to the inner cover, preventing the layers from detaching.

The present invention also utilizes and controls the thickening phenomenon that produces when nitrile latex mixes with natural rubber latex, under the situation that does not adopt conventional thickening such as adding thickener, adjusts the kind and the consumption of the stabilizer that adds mixed rubber, reaches The purpose of increasing the viscosity of the mixed glue to a certain range. Thickening the mixed latex by this method, while ensuring the thickening quality, solves the problems of poor stability of the latex after thickening and easy occurrence of colloidal particles, and reduces the thickening cost at the same time.

The present invention adopts the ceramic glove model soaked in hot water and heated up, impregnated with a coagulant, and after drying, is impregnated with primary glue, secondary glue, and an inner covering layer in turn, and is mechanically crimped to complete molding, and is stripped from the ceramic glove model after vulcanization. The above-mentioned processes are all completed by conventional methods.

In the preparation process of the present invention, some auxiliary materials are also used, such as adding flavor-masking agents to achieve the effect of flavor-enhancing and flavor-masking. Adding a defoamer can effectively reduce the interdigitated bubbles that occur during the dipping process and improve the yield. The addition of color paste makes the appearance of the gloves show different colors, giving people a beautiful feeling. In addition, it is necessary to add a conventional amount of vulcanizing agent and anti-aging agent and other additives according to the actual production.

Using elastic polyurethane emulsion as the inner coating of gloves, due to the special structure of urethane bonds in the elastic polyurethane molecular chain, it has good adhesion, the coating is not easy to fall off, good elasticity, high strength, wear resistance, and its biocompatibility Well, more importantly, it has good compactness, which can better block the precipitation of protein in the inner coating film containing natural latex, greatly improves the safety of gloves, reduces the friction of the inner surface, and makes the gloves smooth and easy to wear ;Elastic polyurethane emulsion is a kind of water-emulsion material, the production process does not need chlorine treatment, and has no pollution to the environment.

Detailed ways:

The content of the present invention will be further elaborated below in conjunction with the examples.

Example 1

When preparing primary glue, the solid content ratio of NR and NBR is NR/NBR=30/70, the solid matter of latex accounts for the percentage M=98.7% of solid matter in the primary glue; when preparing secondary glue, NR and NBR Solid content ratio is, NR/NBR=80/20, and the solid matter of latex accounts for the percentage N=68.5% of solid matter in secondary glue;

The mass ratio of primary glue ingredients is calculated by solid content, which is:

NR: m=29.7, NBR: 69,

KOH: 0.5, ZnO: 0.8,

Total: 100;

In addition, add the following ingredients according to the mass percentage of primary glue:

Defoamer: 0.1%, color paste: 0.015%, odor masking agent: 0.2%;

The viscosity of primary glue is: 80 centipoise;

The mass ratio of the ingredients of the secondary glue is calculated by solid content, which is:

NR n=54.8, NBR 13.7,

KOH and/casein 0.5, filler 31,

Total: 100;

In addition, add the following ingredients according to the mass percentage of the secondary glue:

1% defoamer, 0.03% color paste, 0.2% masking agent;

The viscosity of the secondary glue is: 180 centipoise.

In the continuous production process, 40% of the original secondary glue is replaced by the newly prepared secondary glue every day.

The mass ratio of KOH and casein in the secondary glue batching is 1/1. The filler used in secondary glue is calcium carbonate. The filler particle size is: 20-30 microns.

The elastic polyurethane latex forming the inner coating consists of the following components in parts by weight: 10 elastic polyurethane with a concentration of 30%; 90 soft water.

According to the above ingredients and method, by impregnating the coagulant on the glove model, after drying, impregnating the primary glue, the secondary glue, and the inner covering layer in turn, the physical and mechanical properties of Guangli household gloves meet the requirements of ASTM D4679-02 standard, and the aging Tensile strength ≥ 10MPa, elongation ≥ 500%; after aging, tensile strength ≥ 7.5MPa, elongation ≥ 375%. According to the ASTM D4679-02 standard, the oil resistance is better than ordinary household gloves. After soaking in IRL930 standard oil, the tensile strength of the composite household glove samples decreased by 22%, the tensile strength decreased by 32%, and the elongation decreased by 10%. The tensile strength of the sample sheet treated with chlorine decreased by 82%, the tensile strength decreased by 87%, and the elongation decreased by 38%.

Example 2

When preparing primary glue, the solid content ratio of NR and NBR is NR/NBR=38/62, and the solid matter of latex accounts for the percentage M=98.7% of solid matter in the primary glue; when preparing secondary glue, NR and NBR Solid content ratio is, NR/NBR=90/10, and the solid matter of latex accounts for the percentage N=68.5% of solid matter in secondary glue;

The mass ratio of primary glue ingredients is calculated by solid content, which is:

NR: m=37.5, NBR: 61.2,

KOH: 0.5, ZnO: 0.8,

Total: 100;

In addition, add the following ingredients according to the mass percentage of primary glue:

Defoamer: 0.1%, color paste: 0.015%, odor masking agent: 0.2%;

The viscosity of the primary glue is: 120 centipoise;

The mass ratio of the ingredients of the secondary glue is calculated by solid content, which is:

NR n=61.7, NBR 6.8,

KOH and/casein 0.5, filler 31,

Total: 100;

In addition, add the following ingredients according to the mass percentage of the secondary glue:

1% defoamer, 0.03% color paste, 0.2% masking agent;

The viscosity of the secondary glue is: 220 centipoise.

In the continuous production process, 40% of the original secondary glue is replaced by the newly prepared secondary glue every day.

The mass ratio of KOH and casein in the secondary glue is: 1/1. The filler used in secondary glue is calcium carbonate. The filler particle size is: 20-30 microns.

The elastic polyurethane latex forming the inner coating consists of the following components in parts by weight: 10 elastic polyurethane with a concentration of 30%; 90 soft water.

According to the above ingredients and method, by impregnating the coagulant on the glove model, after drying, impregnating the primary glue, the secondary glue, and the inner covering layer in turn, the physical and mechanical properties of Guangli household gloves meet the requirements of ASTM D4679-02 standard, and the aging Tensile strength ≥ 10MPa, elongation ≥ 500%; after aging, tensile strength ≥ 7.5MPa, elongation ≥ 375%. According to the ASTM D4679-02 standard, the oil resistance is better than ordinary household gloves. After soaking in IRL930 standard oil, the tensile strength of the composite household glove samples decreased by 24%, the tensile strength decreased by 35%, and the elongation decreased by 11%. The tensile strength of the sample sheet treated with chlorine decreased by 82%, the tensile strength decreased by 87%, and the elongation decreased by 38%.

Example 3

When preparing primary glue, the solid content ratio of NR and NBR is NR/NBR=22/78, and the solid matter of latex accounts for the percentage M=97% of solid matter in the primary glue; when preparing secondary glue, NR and NBR Solid content ratio is, NR/NBR=70/30, and the solid matter of latex accounts for the percentage N=67% of solid matter in secondary glue;

The mass ratio of primary glue ingredients is calculated by solid content, which is:

NR: m=21.34, NBR: 75.66,

KOH: 0.3, ZnO: 2.7,

Total: 100;

In addition, add the following ingredients according to the mass percentage of primary glue:

Defoamer: 0.1%, color paste: 0.015%, odor masking agent: 0.2%;

The viscosity of primary glue is: 90 centipoise;

The mass ratio of the ingredients of the secondary glue is calculated by solid content, which is:

NR n=46.9, NBR 20.1,

KOH and/casein 0.3, filler 32.7,

Total: 100;

In addition, add the following ingredients according to the mass percentage of the secondary glue:

1% defoamer, 0.03% color paste, 0.2% masking agent;

The viscosity of the secondary glue is: 230 centipoise.

In the continuous production process, 40% of the original secondary glue is replaced by the newly prepared secondary glue every day.

The mass ratio of KOH and casein in secondary glue is: 1.5/1. The filler used in secondary glue is calcium carbonate. The filler particle size is: 20-30 microns.

The elastic polyurethane latex forming the inner coating consists of the following components in parts by weight: 10 elastic polyurethane with a concentration of 30%; 90 soft water.

According to the above ingredients and method, by impregnating the coagulant on the glove model, after drying, impregnating the primary glue, the secondary glue, and the inner covering layer in turn, the physical and mechanical properties of Guangli household gloves meet the requirements of ASTM D4679-02 standard, and the aging Tensile strength ≥ 10MPa, elongation ≥ 500%; after aging, tensile strength ≥ 7.5MPa, elongation ≥ 375%. According to the ASTM D4679-02 standard, the oil resistance is better than ordinary household gloves. After soaking in IRL930 standard oil, the tensile strength of the composite household glove samples decreased by 27%, the tensile strength decreased by 37%, and the elongation decreased by 12%. The tensile strength of the sample sheet treated with chlorine decreased by 82%, the tensile strength decreased by 87%, and the elongation decreased by 38%.

Claims (8)

1. The preparation method of compound light household rubber gloves, using the mixed latex of NR and NBR as raw material, including impregnating coagulant on the glove model, after drying, impregnating primary glue, secondary glue and inner covering layer successively, it is characterized in that: preparation In the primary glue, the solid content ratio of NR and NBR is NR/NBR=20～40/80～60, the solid matter of the latex accounts for the percentage of solid matter in the primary glue M=96～99%; when preparing the secondary glue, The solid content ratio of NR and NBR is: NR/NBR=70～90/10～30, the solid matter of the latex accounts for the percentage of solid matter in the secondary glue N=66～69%; The mass ratio of primary glue ingredients is calculated by solid content, which is: NR: m=19.2～39.48, NBR: 100M-m, KOH: 0.1～0.5, ZnO: balance, Total: 100; In addition, add the following ingredients according to the mass percentage of primary glue: Defoamer: 0.05-0.3%, color paste 0.01-0.1%, odor-masking agent: 0.05-0.5%; The viscosity of the primary glue is: 30 centipoise to 180 centipoise; The mass ratio of the ingredients of the secondary glue is calculated by solid content, which is: NR n=46.2～62.1, NBR 100N-n, KOH and casein 0.25～0.7, filler balance, Total: 100; In addition, add the following ingredients according to the mass percentage of the secondary glue: 0.8-1.2% defoamer, 0.01-0.1% color paste, 0.05-0.5% masking agent; The viscosity of the secondary glue is: 120 centipoise to 280 centipoise. 2. the preparation method of compound light household rubber gloves according to claim 1 is characterized in that: when preparing primary glue, the solid content ratio of NR and NBR is, NR/NBR=25～35/65～75, the latex The solid matter accounts for the percentage of solid matter in the primary glue M=98-99%; when preparing the secondary glue, the solid content ratio of NR and NBR is NR/NBR=75-85/15-25, and the solid matter of the latex accounts for two The percentage of solid matter in the rubber is N=68～69%; The mass ratio of primary glue ingredients is calculated by solid content, which is: NR: m=25.4～34.65, NBR: 100M-m, KOH: 0.3～0.5, ZnO: balance, Total: 100; In addition, add the following ingredients according to the mass percentage of primary glue: 0.05-0.3% defoamer, 0.01-0.1% color paste, 0.05-0.5% masking agent; The viscosity of the primary glue is: 60 centipoise to 120 centipoise; The mass ratio of the ingredients of the secondary glue is calculated by solid content, which is: NR n=51～58.65, NBR 100N-n, KOH and casein 0.3～0.5, filler balance, Total: 100; In addition, add the following ingredients according to the mass percentage of the secondary glue: 0.8-1.2% defoamer, 0.01-0.1% color paste, 0.05-0.5% masking agent; The viscosity of the secondary glue is: 140 centipoise to 230 centipoise. 3. The preparation method of composite light household rubber gloves according to claim 1 or 2, characterized in that: in the continuous production process, 30% to 60% of the original secondary glue is replaced with newly prepared secondary glue every day. 4. The preparation method of composite light household rubber gloves according to claim 1 or 2, characterized in that the mass ratio of KOH and casein is 1 to 2/1 during the secondary rubber compounding. 5. The preparation method of composite light-lined household rubber gloves according to claim 1, 2 or 3, characterized in that: the filler is selected from TiO ₂ and calcium carbonate. 6. The method for preparing composite light-filled household rubber gloves according to claim 1, 2 or 3, characterized in that the particle size of the filler is 1-50 microns. 7. The method for preparing composite light household rubber gloves according to claim 6, characterized in that: the particle size of the filler is 20-30 microns. 8. the preparation method of composite optical household rubber gloves according to claim 1 is characterized in that: use elastic polyurethane emulsion as glove inner cladding, form the elastic polyurethane latex on the inner cladding to be made up of the component of following parts by weight : 30% elastic polyurethane 5-17; soft water 83-95.