Breathable latex gloves and preparation method thereof

Abstract

The invention discloses a breathable latex glove and a preparation method thereof, and relates to the technical field of gloves, the breathable latex glove comprises the following components by weight: 90-100 parts of natural latex, 20-30 parts of a polyurethane emulsion, 10-12 parts of a vulcanizing agent, 5-7 parts of an accelerator, and 10-15 parts of a nano silica modified liquid, the breathable latex glove has good wear resistance and puncture resistance, and is soft in texture and good in breathability.

Description

Technical Field

[0001] The present invention relates to the technical field of gloves, in particular to a breathable latex glove and a preparation method thereof. Background Art

[0002] Latex gloves are made from latex and are commonly used as hand protection in daily life and work. Natural latex gloves are made from natural latex through vulcanization and other steps. They are non-toxic, harmless, strong and durable.

[0003] Natural latex gloves have better elasticity and adhesion, but they still have problems such as poor anti-slip performance and poor breathability. Summary of the Invention

[0004] One object of the present invention is to provide a breathable latex glove, which has good wear resistance, puncture resistance and anti-slip properties, is soft in texture and has good breathability. A second object of the present invention is to provide a method for preparing the breathable latex glove, which can use traditional latex glove processing equipment, has a simple process and is convenient for industrial production.

[0005] One of the purposes of the present invention is achieved by the following technical solution:

[0006] A breathable latex glove comprising the following components in parts by weight: 90-100 parts of natural latex, 20-30 parts of polyurethane emulsion, 10-12 parts of vulcanizing agent, 5-7 parts of accelerator and 10-15 parts of nano-silicon dioxide modifying liquid;

[0007] The nano-silica modified liquid comprises the following preparation steps: adding nanoporous silica into anhydrous ethanol, dispersing under ultrasonic stirring at room temperature, then sequentially adding polydimethylsiloxane and silane coupling agent, and continuing ultrasonic stirring at 50-60° C. to obtain the nano-silica modified liquid.

[0008] The particle size of nanoporous silica is 40-60nm, and nanoporous silica is easily and evenly dispersed by ultrasonication in anhydrous ethanol. Polydimethylsiloxane is a high molecular weight polymer that is non-toxic, odorless, highly transparent, and has excellent heat and cold resistance, electrical insulation, and hydrophobicity. When polydimethylsiloxane is added to the nanoporous silica liquid, the nanoporous silica has a large specific surface area and can absorb the polydimethylsiloxane. At the same time, the polydimethylsiloxane has a certain viscosity, which can prevent the nanoporous silica from agglomerating. The nanoporous silica modified liquid will not agglomerate or other problems when left in a static state, ensuring its uniform dispersion.

[0009] Silane coupling agents can react with organic and inorganic substances at the same time. Silane coupling agents can firmly combine nanoporous silica with polydimethylsiloxane, polyurethane emulsion and natural latex.

[0010] Preferably, the mass ratio of the anhydrous ethanol to the nano-silica is (3-5):1, the mass ratio of the polydimethylsiloxane to the nano-silica is (0.1-0.2):1, and the mass ratio of the silane coupling agent to the nano-silica is (0.1-0.2):1.

[0011] Preferably, the vulcanizing agent is sulfur, and the accelerator is zinc dibutyldithiocarbamate.

[0012] Preferably, the mass fraction of the natural latex is 60-70%.

[0013] Preferably, the viscosity of the polydimethylsiloxane is 8000-10000 mm 2 / s.

[0014] Preferably, the silane coupling agent is silane coupling agent KH560.

[0015] The second object of the present invention is achieved by adopting the following technical solution:

[0016] A method for preparing the above-mentioned breathable latex gloves comprises the following steps:

[0017] S1: Add vulcanizing agent to natural latex for pre-vulcanization treatment;

[0018] S2: Add the nano-silica modified liquid to the polyurethane emulsion and stir evenly to obtain a premixed liquid;

[0019] S3: adding the premixed liquid to the pre-vulcanized natural latex, stirring continuously, and then adding an accelerator to obtain a latex mixture;

[0020] S4: dipping the hand mold in a coagulant aqueous solution, drying, and then dipping the hand mold in a latex mixture, drying, and then sequentially performing vulcanization, drying, cooling, and demoulding treatments to obtain the breathable latex gloves.

[0021] Preferably, in step S1, the pre-sulfurization temperature is 60-70°C.

[0022] Preferably, in step S4, the vulcanization temperature is 120-130°C.

[0023] The beneficial effects of the present invention are:

[0024] (1) The present invention uses natural latex and polyurethane emulsion as main raw materials, and the gloves produced are softer, which improves the touch feel of the gloves and improves the anti-slip property of the gloves;

[0025] (2) The addition of nano-silica modifying liquid to the present invention enhances the wear resistance, puncture resistance, air permeability and anti-slip properties of the present invention; the addition of polydimethylsiloxane to the nano-silica modifying liquid can prevent the agglomeration of nanoporous silica, enhance the dispersibility of the nano-silica modifying liquid, and enhance the hydrophobicity of the gloves; the addition of a silane coupling agent to the nano-silica modifying liquid can firmly combine the nano-porous silica in the network structure of the polyurethane emulsion and the natural latex, thereby enhancing the chemical correlation. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the invention more clearly understood, the invention is further described below in conjunction with embodiments and comparative examples.

[0027] Example 1

[0028] A breathable latex glove comprises the following components in parts by weight: 90 parts of natural latex with a mass fraction of 60%, 30 parts of polyurethane emulsion, 12 parts of sulfur, 5 parts of zinc dibutyldithiocarbamate, and 15 parts of nano-silica modifying liquid. The preparation method of the nano-silica modifying liquid comprises the following steps: adding 15 parts of nanoporous silica to 60 parts of anhydrous ethanol, dispersing the mixture under ultrasonic stirring at room temperature for 30 minutes, and then sequentially adding 1.5 parts of polydimethylsiloxane and 1.5 parts of silane coupling agent KH560, wherein the viscosity of the polydimethylsiloxane is 10,000 mm 2 / s, and continue ultrasonic stirring at 60 °C for 1 h to obtain nano-silica modified liquid.

[0029] The preparation method of the breathable latex gloves comprises the following steps: adding sulfur to natural latex, performing a pre-vulcanization treatment at 60°C for 30 minutes, adding a nano-silica modified liquid to a polyurethane emulsion, stirring for 5 hours, then adding the modified liquid to the pre-vulcanized natural latex, and then adding zinc dibutyl dithiocarbamate, and continuously stirring for 5 hours to obtain a latex mixed liquid; immersing a hand mold in a coagulant aqueous solution, drying at 70°C, then immersing the hand mold in the latex mixed liquid, drying at 70°C, and then performing vulcanization, drying, cooling and demoulding treatments in sequence to obtain the breathable latex gloves.

[0030] Example 2

[0031] A breathable latex glove comprises the following components in parts by weight: 100 parts of natural latex with a mass fraction of 60%, 20 parts of polyurethane emulsion, 11 parts of sulfur, 6 parts of zinc dibutyldithiocarbamate, and 10 parts of nano-silica modifying liquid. The preparation method of the nano-silica modifying liquid comprises the following steps: adding 10 parts of nanoporous silica to 50 parts of anhydrous ethanol, dispersing the mixture under ultrasonic stirring at room temperature for 30 minutes, then sequentially adding 2 parts of polydimethylsiloxane and 2 parts of silane coupling agent KH560, wherein the viscosity of the polydimethylsiloxane is 10,000 mm 2 / s, and continue ultrasonic stirring at 60 °C for 1 h to obtain nano-silica modified liquid.

[0032] The preparation method of the breathable latex gloves comprises the following steps: adding sulfur to natural latex, performing a pre-vulcanization treatment at 60°C for 30 minutes, adding a nano-silica modified liquid to a polyurethane emulsion, stirring for 5 hours, then adding the modified liquid to the pre-vulcanized natural latex, and then adding zinc dibutyl dithiocarbamate, and continuously stirring for 5 hours to obtain a latex mixed liquid; immersing a hand mold in a coagulant aqueous solution, drying at 70°C, then immersing the hand mold in the latex mixed liquid, drying at 70°C, and then performing vulcanization, drying, cooling and demoulding treatments in sequence to obtain the breathable latex gloves.

[0033] Example 3

[0034] A breathable latex glove comprises the following components in parts by weight: 90 parts of natural latex with a mass fraction of 70%, 25 parts of polyurethane emulsion, 10 parts of sulfur, 7 parts of zinc dibutyldithiocarbamate, and 12 parts of nano-silica modifying liquid. The preparation method of the nano-silica modifying liquid comprises the following steps: adding 12 parts of nanoporous silica to 50 parts of anhydrous ethanol, dispersing the mixture under ultrasonic stirring at room temperature for 30 minutes, then sequentially adding 2 parts of polydimethylsiloxane and 1.5 parts of silane coupling agent KH560, wherein the viscosity of the polydimethylsiloxane is 10,000 mm 2 / s, and continue ultrasonic stirring at 60 °C for 1 h to obtain nano-silica modified liquid.

[0035] The preparation method of the breathable latex gloves comprises the following steps: adding sulfur to natural latex, performing a pre-vulcanization treatment at 60°C for 30 minutes, adding a nano-silica modified liquid to a polyurethane emulsion, stirring for 5 hours, then adding the modified liquid to the pre-vulcanized natural latex, and then adding zinc dibutyl dithiocarbamate, and continuously stirring for 5 hours to obtain a latex mixed liquid; immersing a hand mold in a coagulant aqueous solution, drying at 70°C, then immersing the hand mold in the latex mixed liquid, drying at 70°C, and then performing vulcanization, drying, cooling and demoulding treatments in sequence to obtain the breathable latex gloves.

[0036] Example 4

[0037] A breathable latex glove comprises the following components in parts by weight: 95 parts of natural latex with a mass fraction of 70%, 25 parts of polyurethane emulsion, 10 parts of sulfur, 7 parts of zinc dibutyldithiocarbamate, and 15 parts of nano-silica modifying liquid. The preparation method of the nano-silica modifying liquid comprises the following steps: adding 15 parts of nanoporous silica to 60 parts of anhydrous ethanol, dispersing the mixture under ultrasonic stirring at room temperature for 30 minutes, then sequentially adding 3 parts of polydimethylsiloxane and 3 parts of silane coupling agent KH560, wherein the viscosity of the polydimethylsiloxane is 8000 mm 2 / s, and continue ultrasonic stirring at 60 °C for 1 h to obtain nano-silica modified liquid.

[0038] The preparation method of the breathable latex gloves comprises the following steps: adding sulfur to natural latex, performing a pre-vulcanization treatment at 60°C for 30 minutes, adding a nano-silica modified liquid to a polyurethane emulsion, stirring for 5 hours, then adding the modified liquid to the pre-vulcanized natural latex, and then adding zinc dibutyl dithiocarbamate, and continuously stirring for 5 hours to obtain a latex mixed liquid; immersing a hand mold in a coagulant aqueous solution, drying at 70°C, then immersing the hand mold in the latex mixed liquid, drying at 70°C, and then performing vulcanization, drying, cooling and demoulding treatments in sequence to obtain the breathable latex gloves.

[0039] Comparative Example 1

[0040] Compared with Example 1, the polyurethane emulsion in Comparative Example 1 was completely replaced by natural latex.

[0041] Comparative Example 2

[0042] Compared with Example 1, the components of the breathable latex gloves of Comparative Example 2 do not include the nano-silica modifying liquid.

[0043] Comparative Example 3

[0044] Compared with Example 1, the preparation method of the breathable latex gloves in Comparative Example 3 does not include pre-vulcanization treatment of natural latex, and sulfur is added together with zinc dibutyldithiocarbamate.

[0045] Comparative Example 4

[0046] Compared with Example 1, in Comparative Example 4, no polydimethylsiloxane was added when preparing the nano-silica modified liquid.

[0047] Comparative Example 5

[0048] Compared with Example 1, in Comparative Example 5, no silane coupling agent was added when preparing the nano-silica modified liquid.

[0049] The abrasion resistance and puncture resistance of the breathable latex gloves of Examples 1-3 and Comparative Examples 1-5 were tested according to EN388, and the air permeability of the breathable latex gloves of Examples 1-3 and Comparative Examples 1-5 was tested according to QB / T 5156-2017. The slip resistance of the breathable latex gloves of Examples 1-3 and Comparative Examples 1-5 was tested according to GB 10006-1988.

[0050] A panel of five people was selected to evaluate the touch feel of the breathable latex gloves of Examples 1-4 and Comparative Examples 1-5, using a five-point scale (1: hard → 5: soft). The nano-silica modified solutions of Examples 1-4 and Comparative Examples 1-5 were allowed to stand for 12 hours, and then their appearance was evaluated.

[0051] The test results are shown in Table 1.

[0052] Table 1 Performance test results of breathable latex gloves of Examples 1-4 and Comparative Examples 1-5

[0053]

[0054] As can be seen from Table 1, the air permeability, static friction coefficient, dynamic friction coefficient and hand feel of Example 1 are significantly higher than those of Comparative Example 1, which indicates that the addition of polyurethane can improve the air permeability, anti-slip and touch feel of the gloves; the wear resistance, puncture resistance, air permeability, static friction coefficient, dynamic friction coefficient and hand feel of Example 1 are significantly higher than those of Comparative Examples 2-5, which indicates that: (1) the addition of nano-silica modified liquid can significantly improve the air permeability, anti-slip and mechanical properties of the gloves; (2) pre-vulcanization treatment of natural latex before mixing with polyurethane can improve the air permeability, anti-slip and mechanical properties of the gloves; and (3) the lack of polydimethylsiloxane or silane coupling agent in the nano-silica modified liquid will affect the performance of the gloves.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A breathable latex glove, characterized in that: The invention comprises the following components in parts by weight: 90-100 parts of natural latex, 20-30 parts of polyurethane emulsion, 10-12 parts of vulcanizing agent, 5-7 parts of accelerator and 10-15 parts of nano-silicon dioxide modified liquid; The nano-silica modified liquid comprises the following preparation steps: adding nanoporous silica into anhydrous ethanol, dispersing under ultrasonic stirring at room temperature, then sequentially adding polydimethylsiloxane and silane coupling agent, and continuing ultrasonic stirring at 50-60° C. to obtain the nano-silica modified liquid.

2. A breathable latex glove according to claim 1, characterized in that: The mass ratio of the anhydrous ethanol to the nano-silica is (3-5):1, the mass ratio of the polydimethylsiloxane to the nano-silica is (0.1-0.2):1, and the mass ratio of the silane coupling agent to the nano-silica is (0.1-0.2):

1.

3. A breathable latex glove according to claim 1, characterized in that: The vulcanizing agent is sulfur, and the accelerator is zinc dibutyldithiocarbamate.

4. The breathable latex glove according to claim 1, characterized in that: The mass fraction of the natural latex is 60-70%.

5. The breathable latex gloves according to claim 1, characterized in that: The viscosity of the polydimethylsiloxane is 8000-10000mm 2 / s.

6. The breathable latex glove according to claim 1, characterized in that: The silane coupling agent is silane coupling agent KH560.

7. A method for preparing the breathable latex gloves according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Add vulcanizing agent to natural latex for pre-vulcanization treatment; S2: Add the nano-silica modified liquid to the polyurethane emulsion and stir evenly to obtain a premixed liquid; S3: adding the premixed liquid to the pre-vulcanized natural latex, stirring continuously, and then adding an accelerator to obtain a latex mixture; S4: dipping the hand mold in a coagulant aqueous solution, drying, and then dipping the hand mold in a latex mixture, drying, and then sequentially performing vulcanization, drying, cooling, and demoulding treatments to obtain the breathable latex gloves.

8. The method for preparing a breathable latex glove according to claim 7, characterized in that: In step S1, the pre-sulfurization temperature is 60-70°C.

9. The method for preparing a breathable latex glove according to claim 7, characterized in that: In step S4, the vulcanization temperature is 120-130°C.

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