Butyronitrile gloves with pearly luster and preparation method thereof

Abstract

The invention relates to the technical field of butyronitrile gloves, and discloses a butyronitrile glove with pearly luster and a preparation method thereof. The surface of the butyronitrile glove is endowed with pearly luster by adding the pearl powder, and the problems that a traditional butyronitrile glove is single in color and low in identification degree are solved. The preparation method comprises the following steps: mixing nitrile rubber latex with suspension containing pearl powder, wherein the pearl powder is pre-dispersed by xanthan gum and bentonite to improve the compatibility. A sulfur-free vulcanization system is adopted to reduce the vulcanization temperature, and energy consumption and high-temperature waste gas are reduced. By adding polylactic acid, the degradability is improved. Through two times of dip forming, low-temperature vulcanization and chlorine washing, the pinhole rate is effectively reduced, the tensile strength and glossiness are improved, and meanwhile the chlorine residue and skin sensitivity risk are reduced. The composite material has the advantages of high identification degree, excellent mechanical property and environmental protection property, and is suitable for high-end scenes such as medical treatment and food processing.

Description

Technical Field

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

[0002] Disposable nitrile gloves are the most cost-effective disposable isolation protective gloves and are widely used in pharmaceutical, nursing, medical examination, bioengineering, food processing, fast food service and other fields. With the continuous development of the world economy and medical protection industry, new industries and fields are emerging and starting to wear disposable gloves, which put forward higher requirements on glove functions and other aspects.

[0003] Traditional nitrile gloves are mostly single-color, lacking visual appeal and difficult to meet the requirements of high-end scenarios for product appearance. In addition, when multiple people work together or switch between different processes, the homogeneity of the gloves' appearance leads to low recognition, which can easily cause confusion and operational errors. Existing technologies attempt to improve color by dyeing or adding pigments, but this can easily lead to deterioration of material performance or insufficient color fastness.

[0004] In addition, traditional processes often use chlorine washing steps to improve surface smoothness. In order to achieve a higher surface smoothness, multiple chlorine washings are generally used, resulting in more chlorine elements remaining in nitrile gloves, causing skin sensitivity to the wearer. Multiple chlorine washings will destroy the film structure and reduce flexibility and comfort. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a nitrile glove with pearl luster and a preparation method thereof. By adding pearl powder, the problem of single color of nitrile gloves is solved; by adding auxiliary materials and improving the preparation process, the flexibility and comfort of nitrile gloves are maintained; specifically, this is achieved in the following ways.

[0006] The present invention provides a nitrile glove with pearl luster, comprising the following components in parts by weight: 150-600 parts of nitrile rubber latex, 8-10 parts of zinc oxide powder, 3-6 parts of vulcanizing agent, 0.3-4 parts of accelerator, 1-3 parts of titanium dioxide, 0.5-3 parts of antioxidant powder, 0.1-1 parts of dispersant powder, 3-5 parts of liquid silicone cross-linking agent, 10-18 parts of biodegradable additives, 0.1-0.5 parts of xanthan gum, 0.1-0.5 parts of bentonite, 6-40 parts of pearl powder, and the remaining ingredients are deionized water.

[0007] The vulcanizing agent is a mixture of di-tert-butyl peroxide isopropylbenzene and triallyl isocyanurate in a mass ratio of 1:0.7 to 1.5, and the liquid silicone cross-linking agent is a blocked isocyanate.

[0008] Preferably, the antioxidant is a mixture of 6PPD and KY-616, and the mixing mass ratio is 1:0.6-1.

[0009] Preferably, the accelerator is zinc dibutyldithiocarbamate.

[0010] Preferably, the dispersant is sodium polynaphthalenesulfonate.

[0011] Preferably, the degradable additive is polylactic acid.

[0012] The present invention also provides a method for preparing nitrile gloves with pearl luster, comprising the following steps: Step 1: Add 8 to 10 parts of zinc oxide powder, 3 to 6 parts of vulcanizing agent, 0.3 to 4 parts of accelerator, 1 to 3 parts of titanium dioxide, 0.5 to 3 parts of antioxidant powder, 0.1 to 1 part of dispersant powder, 3 to 5 parts of liquid silicone crosslinking agent, 10 to 18 parts of degradable additives and an appropriate amount of water into a dispersion stirring tank, disperse and stir for 10 to 20 hours to prepare a dispersion with a solid content of 45% to 55%.

[0013] Step 2: Grind the dispersion in a sand mill for 4 to 8 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain the nitrile latex auxiliary material for use.

[0014] Step 3: Add 0.1-0.5 parts of xanthan gum, 0.1-0.5 parts of bentonite, and 40-200 parts of deionized water into a dispersion stirring tank, disperse and stir until the xanthan gum and bentonite are completely dissolved, add 6-40 parts of pearl powder, disperse and stir for 1-2 hours, and prepare a pearl powder suspension.

[0015] Step 4: Add the nitrile rubber latex, nitrile latex auxiliary materials and pearl powder suspension into a dispersion stirring tank, disperse and stir for 1 to 1.5 hours to prepare a slurry for standby use.

[0016] Step 5: Add 6 to 12 parts of soluble salt, 0.5 to 1.5 parts of release agent and 70 to 90 parts of deionized water into a dispersion stirring tank by weight, and disperse and stir for 10 to 20 minutes to prepare a coagulant solution.

[0017] Step 6: Heat the hand mold to 50-70° C., immerse it in the coagulant solution for 5 minutes, take it out and dry it, immerse it in the slurry for 10 minutes, take it out and dry it, immerse it in the slurry again for 5 minutes, take it out and dry it, and obtain the nitrile gloves.

[0018] Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0019] Preferably, in step 4, the mass ratio of the nitrile rubber latex, the nitrile latex auxiliary material, and the pearl powder suspension is 10:0.8-1.5:1.6-3.0.

[0020] Preferably, in step 6, the temperature of the hand mold is always maintained at 50-70° C. when it is immersed in the slurry.

[0021] Preferably, in step 5, the soluble salt is one or more of calcium nitrate, calcium chloride, magnesium nitrate, magnesium chloride, zinc nitrate and zinc chloride.

[0022] Preferably, in step 7, the vulcanization temperature is 65 to 95° C., and the vulcanization time is 0.3 to 0.6 h.

[0023] After adopting the above technical solution, the beneficial effects of the present invention are: 1. By adding pearl powder to nitrile latex, nitrile gloves have a unique pearlescent luster, which improves the appearance, texture and recognition of the gloves.

[0024] 2. By preparing a pearl powder suspension, the effect of adding pearl powder to the nitrile latex system is reduced, so that the nitrile gloves have a pearlescent luster while maintaining flexibility and fit.

[0025] 3. Pearlescent powder will form a layer of tiny particles on the surface of gloves. This layer of particles can reduce friction when the hands come into contact with tools or objects, making the operation smoother in industrial production.

[0026] 4. During the processing, the pearl powder particles act as a lubricant, making the sliding between the molecules of the glove material smoother, making the gloves softer and easier to bend and stretch. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0028] An embodiment of the present invention provides a nitrile glove with pearl luster and a preparation method thereof, the preparation method comprising the following steps: Step 1: Add 8 to 10 parts of zinc oxide powder, 3 to 6 parts of vulcanizing agent, 0.3 to 4 parts of accelerator, 1 to 3 parts of titanium dioxide, 0.5 to 3 parts of antioxidant powder, 0.1 to 1 part of dispersant powder, 3 to 5 parts of liquid silicone crosslinking agent, 10 to 18 parts of degradable additives and an appropriate amount of water into a dispersion stirring tank, disperse and stir for 10 to 20 hours to prepare a dispersion with a solid content of 45% to 55%.

[0029] Wherein, the vulcanizing agent is a mixture of di-tert-butyl peroxide isopropylbenzene and triallyl isocyanurate in a mass ratio of 1:0.7 to 1.5.

[0030] The present invention adopts a sulfur-free vulcanization system of di-tert-butyl peroxide isopropylbenzene and triallyl isocyanurate, breaks through the energy consumption limit of traditional high-temperature vulcanization, reduces the baking temperature, and reduces the vulcanization temperature from 105-135°C to 65-95°C, thereby simplifying the process and reducing high-temperature exhaust gas emissions, solving the dual problems of environmental protection and efficiency.

[0031] The accelerator is zinc dibutyl dithiocarbamate, the antioxidant is a mixture of 6PPD and KY-616 in a mass ratio of 1:0.6-1, the dispersant is sodium polynaphthalenesulfonate, and the degradable additive is polylactic acid.

[0032] The present invention adopts mixed use of different types of antioxidants, so that the combination of cresol and dicyclopentadiene butylation product is applied to nitrile latex, which significantly improves the antioxidant performance, synergistically delays oxidative aging, and solves the problem of yellowing easily caused by a single antioxidant.

[0033] Among them, the xanthan gum is the xanthan gum of Ordos Zhongxuan Biochemical Co., Ltd., brand 9270; the pearlescent powder is the pearlescent powder of Hangzhou Fuwode Fine Chemical Co., Ltd.; the antioxidant KY-616 is preferably the antioxidant KY-616 produced by Jiangsu Feiya Chemical Industry Co., Ltd.

[0034] The present invention adopts blocked isocyanate as liquid silicone crosslinking agent. Since blocked isocyanate is combined with blocking agent through chemical bonds and is stable at room temperature, when heated to a specific temperature, the blocking agent dissociates and releases active -NCO groups to react with hydroxyl groups, amino groups or water molecules in nitrile latex to form carbamate bonds or urea bonds, thereby constructing a three-dimensional crosslinking network, thereby improving the tensile strength and tear resistance of nitrile gloves.

[0035] In the present invention, polylactic acid is added as a degradable additive to the nitrile latex system, thereby improving the degradability of the nitrile gloves, making them biodegradable while maintaining their mechanical properties, and being more environmentally friendly.

[0036] Step 2: Grind the dispersion in a sand mill for 4 to 8 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, thereby obtaining the nitrile latex auxiliary material for use.

[0037] During the grinding process, a dispersion sample was taken with a dropper every hour, and the particle size of the powder in the dispersion was measured by laser scattering method until the particle size of the powder in the dispersion was uniformly distributed and less than or equal to 5 μm, and then the grinding was stopped.

[0038] Step 3: Add 0.1-0.5 parts of xanthan gum, 0.1-0.5 parts of bentonite, and 40-200 parts of deionized water into a dispersion stirring tank, disperse and stir until the xanthan gum and bentonite are completely dissolved, add 6-40 parts of pearl powder, disperse and stir for 1-2 hours, and prepare a pearl powder suspension.

[0039] Due to the poor compatibility of pearlescent powder with nitrile latex, adding pearlescent powder into the nitrile latex system will affect the stability of the system and reduce the physical properties of the product.

[0040] The invention adds xanthan gum and bentonite. Before adding pearl powder into the system, the invention first adds xanthan gum, bentonite and deionized water to prepare a mixed dispersion to perform a pre-dispersion step to form a stable suspension, thereby reducing the sedimentation of the pearl powder and effectively improving the problem of poor compatibility between the pearl powder and the nitrile latex system.

[0041] Step 4: Add nitrile rubber latex, nitrile latex auxiliary materials, and pearl powder suspension into a dispersion stirring tank according to a mass ratio of 10:0.8-1.5:1.6-3.0, disperse and stir for 1-1.5 hours, and prepare a slurry for standby use.

[0042] The slurry prepared by the above method has significantly improved cross-linking performance, antioxidant performance, biodegradability and other aspects. Under the premise of adding pearl powder, through the combined use of xanthan gum and bentonite, the original mechanical properties of the material are maintained while achieving the pearlescent gloss of nitrile gloves.

[0043] Step 5: Add 6 to 12 parts of soluble salt, 0.5 to 1.5 parts of release agent and 70 to 90 parts of deionized water into a dispersion stirring tank by weight, and disperse and stir for 10 to 20 minutes to prepare a coagulant solution.

[0044] Wherein, the soluble salt is one or more of calcium nitrate, calcium chloride, magnesium nitrate, magnesium chloride, zinc nitrate and zinc chloride.

[0045] Among them, the release agent is one of calcium stearate emulsion, PU resin coating, and acrylic resin.

[0046] The present invention adopts soluble salt and release agent as coagulants, wherein the soluble salt is conducive to film formation on the contact surface between the glove body and the mold during the molding process of the nitrile gloves, thereby improving the surface performance of the nitrile gloves; the use of the release agent is conducive to the separation of the nitrile gloves from the mold, and is convenient for improving the efficiency of the nitrile gloves production process.

[0047] Step 6: Heat the hand mold to 50-70° C., immerse it in the coagulant solution for 5 minutes, take it out and dry it, immerse it in the slurry for 10 minutes, take it out and dry it, immerse it in the slurry again for 5 minutes, take it out and dry it, and obtain the nitrile gloves.

[0048] The temperature of the hand mold is always kept at 50-70° C. when it is immersed in the slurry.

[0049] The present invention immerses the hand mold in the slurry twice so that the prepared nitrile gloves have a double-layer structure, thereby improving the sealing performance of the nitrile gloves and reducing the pinhole rate.

[0050] Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0051] The vulcanization temperature is 65-95°C, and the vulcanization time is 0.3-0.6h.

[0052] During the vulcanization process, the vulcanizing agent induces cross-linking between the molecular chains of nitrile latex at high temperature to form a three-dimensional network structure, which significantly improves the tensile strength, wear resistance and chemical resistance of the gloves. The vulcanization temperature needs to be precisely controlled in this process. Too high a temperature will cause the material to become brittle, while too low a temperature will lead to insufficient cross-linking.

[0053] Among them, the chlorine washing process is to soak nitrile gloves in chlorine-containing solution for 3-5 minutes to kill bacteria and viruses, and remove residual latex protein, unreacted monomers and particulate matter on the surface; chlorine washing can reduce the stickiness of the glove surface, making it easier to wear, while reducing the risk of allergies.

[0054] During the chlorine washing process, the concentration of the chlorine-containing solution needs to be controlled at 50-120 ppm. If the concentration is too high, the gloves will become brittle and yellow. It should also be noted that nitrile gloves after chlorine washing need to be repeatedly rinsed with deionized water to ensure that the chlorine residue is below the safety limit.

[0055] Among them, the leaching of nitrile gloves refers to the removal of soluble salts, auxiliary additives and uncross-linked substances in the film through multiple water washing or alternating soaking in acid and alkali solutions after vulcanization, thereby improving the cleanliness of nitrile gloves.

[0056] The leaching process of the present invention adopts hot leaching and dynamic circulation to improve the leaching effect. It is carried out at a temperature of 60 to 80°C to accelerate the dissolution of impurities. In addition, a circulating water system combined with ultrasonic oscillation is used to further improve the leaching efficiency.

[0057] In order to facilitate further understanding of the present invention, several embodiments and comparative examples of the present invention are given below: Embodiment 1: Step 1, by weight, 10 parts of zinc oxide powder, 3 parts of di-tert-butyl peroxide isopropylbenzene, 3 parts of triallyl isocyanurate, 4 parts of dibutyl zinc dithiocarbamate, 3 parts of titanium dioxide, 1.5 parts of 6PPD powder, 1.5 parts of KY-616 powder, 1 part of polynaphthalenesulfonic acid sodium salt, 5 parts of blocked isocyanate, 18 parts of polylactic acid and an appropriate amount of water are added to a dispersion stirring tank, dispersed and stirred for 20 hours to prepare a dispersion with a solid content of 55%; Step 2, grinding the dispersion in a sand mill for 6 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain a nitrile latex auxiliary material for standby use; Step 3, by weight, add 0.5 parts of xanthan gum, 0.5 parts of bentonite, and 160 parts of deionized water into a dispersion stirring tank, disperse and stir until the xanthan gum and bentonite are completely dissolved, add 35 parts of pearl powder, disperse and stir for 1.5 hours, and prepare a pearl powder suspension; Step 4: Add 10 parts of nitrile rubber latex, 1 part of nitrile latex auxiliary material, and 2 parts of pearl powder suspension into a dispersion stirring tank, disperse and stir for 1.5 hours, and prepare a slurry for standby use; Step 5, by weight, adding 12 parts of calcium chloride, 1.5 parts of calcium stearate emulsion and 80 parts of deionized water into a dispersion stirring tank, and dispersing and stirring for 20 minutes to prepare a coagulant solution; Step 6, heating the hand mold to 70° C., dipping it in a coagulant solution for 5 minutes, taking it out and drying it, dipping it in a slurry for 10 minutes, taking it out and drying it, dipping it in the slurry again for 5 minutes, taking it out and drying it, and obtaining a nitrile glove; Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0058] Embodiment 2: Step 1, by weight, 8 parts of zinc oxide powder, 1.5 parts of di-tert-butyl peroxide isopropyl benzene, 1.5 parts of triallyl isocyanurate, 1 part of zinc dibutyl dithiocarbamate, 1 part of titanium dioxide, 0.5 parts of 6PPD powder, 0.5 parts of KY-616 powder, 0.3 parts of polynaphthalenesulfonic acid sodium salt, 3 parts of blocked isocyanate, 10 parts of polylactic acid and an appropriate amount of water are added to a dispersion stirring tank, dispersed and stirred for 10 hours to prepare a dispersion with a solid content of 50; Step 2, grinding the dispersion in a sand mill for 6 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain a nitrile latex auxiliary material for standby use; Step 3, by weight, add 0.5 parts of xanthan gum, 0.5 parts of bentonite, and 160 parts of deionized water into a dispersion stirring tank, disperse and stir until the xanthan gum and bentonite are completely dissolved, add 35 parts of pearl powder, disperse and stir for 1.5 hours, and prepare a pearl powder suspension; Step 4: Add 10 parts of nitrile rubber latex, 1 part of nitrile latex auxiliary material, and 2 parts of pearl powder suspension into a dispersing and stirring tank, and disperse and stir for 1.5 hours to prepare a slurry for standby use; Step 5, by weight, adding 12 parts of calcium chloride, 1.5 parts of calcium stearate emulsion and 80 parts of deionized water into a dispersion stirring tank, and dispersing and stirring for 20 minutes to prepare a coagulant solution; Step 6, heating the hand mold to 70° C., dipping it in a coagulant solution for 5 minutes, taking it out and drying it, dipping it in a slurry for 10 minutes, taking it out and drying it, dipping it in the slurry again for 5 minutes, taking it out and drying it, and obtaining a nitrile glove; Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0059] Embodiment 3: Step 1, by weight, 10 parts of zinc oxide powder, 3 parts of di-tert-butyl peroxide isopropylbenzene, 3 parts of triallyl isocyanurate, 4 parts of dibutyl zinc dithiocarbamate, 3 parts of titanium dioxide, 1.5 parts of 6PPD powder, 1.5 parts of KY-616 powder, 1 part of polynaphthalenesulfonic acid sodium salt, 5 parts of blocked isocyanate, 18 parts of polylactic acid and an appropriate amount of water are added to a dispersion stirring tank, dispersed and stirred for 20 hours to prepare a dispersion with a solid content of 55%; Step 2, grinding the dispersion in a sand mill for 6 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain a nitrile latex auxiliary material for standby use; Step 3, by weight, add 0.5 parts of xanthan gum, 0.5 parts of bentonite, and 160 parts of deionized water into a dispersion stirring tank, disperse and stir until the xanthan gum and bentonite are completely dissolved, add 35 parts of pearl powder, disperse and stir for 1.5 hours, and prepare a pearl powder suspension; Step 4: Add 10 parts of nitrile rubber latex, 1.5 parts of nitrile latex auxiliary materials, and 3 parts of pearl powder suspension into a dispersion stirring tank, and disperse and stir for 1.2 hours to prepare a slurry for standby use; Step 5, by weight, adding 12 parts of calcium chloride, 1.5 parts of calcium stearate emulsion and 80 parts of deionized water into a dispersion stirring tank, and dispersing and stirring for 20 minutes to prepare a coagulant solution; Step 6, heating the hand mold to 70° C., dipping it in a coagulant solution for 5 minutes, taking it out and drying it, dipping it in a slurry for 10 minutes, taking it out and drying it, dipping it in the slurry again for 5 minutes, taking it out and drying it, and obtaining a nitrile glove; Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0060] Comparative Example 1: Step 1, by weight, 10 parts of zinc oxide powder, 3 parts of di-tert-butyl peroxide isopropylbenzene, 3 parts of triallyl isocyanurate, 4 parts of dibutyl zinc dithiocarbamate, 3 parts of titanium dioxide, 1.5 parts of 6PPD powder, 1.5 parts of KY-616 powder, 1 part of polynaphthalenesulfonic acid sodium salt, 5 parts of blocked isocyanate, 18 parts of polylactic acid and an appropriate amount of water are added to a dispersion stirring tank, dispersed and stirred for 20 hours to prepare a dispersion with a solid content of 55%; Step 2, grinding the dispersion in a sand mill for 6 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain a nitrile latex auxiliary material for standby use; Step 3, by weight, add 35 parts of pearl powder and 160 parts of deionized water into a dispersion stirring tank, disperse and stir for 1.5 hours to prepare a pearl powder suspension; Step 4: Add 10 parts of nitrile rubber latex, 1 part of nitrile latex auxiliary material, and 2 parts of pearl powder suspension into a dispersion stirring tank, disperse and stir for 1.5 hours, and prepare a slurry for standby use; Step 5, by weight, adding 12 parts of calcium chloride, 1.5 parts of calcium stearate emulsion and 80 parts of deionized water into a dispersion stirring tank, and dispersing and stirring for 20 minutes to prepare a coagulant solution; Step 6, heating the hand mold to 70° C., dipping it in a coagulant solution for 5 minutes, taking it out and drying it, dipping it in a slurry for 10 minutes, taking it out and drying it, dipping it in the slurry again for 5 minutes, taking it out and drying it, and obtaining a nitrile glove; Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0061] Comparative Example 2: Step 1, by weight, 10 parts of zinc oxide powder, 3 parts of di-tert-butyl peroxide isopropylbenzene, 3 parts of triallyl isocyanurate, 4 parts of dibutyl zinc dithiocarbamate, 3 parts of titanium dioxide, 1.5 parts of 6PPD powder, 1.5 parts of KY-616 powder, 1 part of polynaphthalenesulfonic acid sodium salt, 5 parts of blocked isocyanate, 18 parts of polylactic acid, 70 parts of pearl powder and an appropriate amount of water are added to a dispersion stirring tank, dispersed and stirred for 20 hours to prepare a dispersion with a solid content of 55%; Step 2, grinding the dispersion in a sand mill for 6 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain a nitrile latex auxiliary material for standby use; Step 3, by weight, add 10 parts of nitrile rubber latex and 1 part of nitrile latex auxiliary material into a dispersing and stirring tank, disperse and stir for 1.5 hours, and prepare a slurry for standby use; Step 4: Add 12 parts of calcium chloride, 1.5 parts of calcium stearate emulsion and 80 parts of deionized water into a dispersion stirring tank, and disperse and stir for 20 minutes to prepare a coagulant solution; Step 5, heating the hand mold to 70° C., dipping it in a coagulant solution for 5 minutes, taking it out and drying it, dipping it in a slurry for 10 minutes, taking it out and drying it, dipping it in the slurry again for 5 minutes, taking it out and drying it, and obtaining a nitrile glove; Step 6: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0062] Comparative Example 3: Step 1, by weight, 10 parts of zinc oxide powder, 3 parts of di-tert-butyl peroxide isopropylbenzene, 3 parts of triallyl isocyanurate, 4 parts of dibutyl zinc dithiocarbamate, 3 parts of titanium dioxide, 1.5 parts of 6PPD powder, 1.5 parts of KY-616 powder, 1 part of polynaphthalenesulfonic acid sodium salt, 18 parts of polylactic acid and an appropriate amount of water are added to a dispersion stirring tank, dispersed and stirred for 20 hours to prepare a dispersion with a solid content of 55%; Step 2, grinding the dispersion in a sand mill for 6 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain a nitrile latex auxiliary material for standby use; Step 3, by weight, add 0.5 parts of xanthan gum, 0.5 parts of bentonite, and 160 parts of deionized water into a dispersion stirring tank, disperse and stir until the xanthan gum and bentonite are completely dissolved, add 35 parts of pearl powder, disperse and stir for 1.5 hours, and prepare a pearl powder suspension; Step 4: Add 10 parts of nitrile rubber latex, 1 part of nitrile latex auxiliary material, and 2 parts of pearl powder suspension into a dispersing and stirring tank, and disperse and stir for 1.5 hours to prepare a slurry for standby use; Step 5, by weight, adding 12 parts of calcium chloride, 1.5 parts of calcium stearate emulsion and 80 parts of deionized water into a dispersion stirring tank, and dispersing and stirring for 20 minutes to prepare a coagulant solution; Step 6, heating the hand mold to 70° C., dipping it in a coagulant solution for 5 minutes, taking it out and drying it, dipping it in a slurry for 10 minutes, taking it out and drying it, dipping it in the slurry again for 5 minutes, taking it out and drying it, and obtaining a nitrile glove; Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

[0063] The pinhole rate, mechanical properties, surface properties and structural uniformity of the pearlescent nitrile gloves prepared in the above examples and comparative examples were tested, and the data are as follows:

[0064] Among them, the pinhole rate detection method is: use the conductivity method to detect the number of pinholes on the surface of the gloves, select multiple glove samples, detect multiple areas of each glove, and calculate the average number of pinholes.

[0065] The glossiness test is measured using a 60° gloss meter; the wear resistance test data is the mass loss after 500 cycles of the Taber wear test.

[0066] Based on the above data, the following conclusions can be drawn: In Comparative Example 1, no xanthan gum and bentonite were added, resulting in unstable dispersion of the pearl powder suspension, low gloss, poor wear resistance, significant decrease in tensile strength, and a sharp increase in pinhole rate.

[0067] In Comparative Example 2, pearl powder was directly added to the dispersion, and the pearlescent structure was destroyed by grinding, which seriously affected the gloss and mechanical properties of the nitrile gloves, and a large number of micropores were formed during film formation.

[0068] Comparative Example 3 did not add blocked isocyanate, resulting in insufficient crosslinking, reduced tensile strength, and loose materials resulting in increased pinholes.

[0069] In Examples 1 to 3, xanthan gum and bentonite are used to achieve the dispersion stability of pearlescent powder, and a cross-linking agent is used to increase the degree of cross-linking, thereby effectively reducing the pinhole rate; The use of a high proportion of nitrile latex auxiliary materials and precise coagulant ratio has excellent comprehensive performance, and by adjusting the ratio of auxiliary materials to suspension, the mechanical properties and glossiness can be effectively balanced.

[0070] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the only specific embodiments. Obviously, based on the above description, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nitrile glove with pearl luster, characterized in that: The composition comprises the following components in parts by weight: 150-600 parts of nitrile rubber latex, 8-10 parts of zinc oxide powder, 3-6 parts of vulcanizing agent, 0.3-4 parts of accelerator, 1-3 parts of titanium dioxide, 0.5-3 parts of antioxidant powder, 0.1-1 parts of dispersant powder, 3-5 parts of liquid silicone crosslinking agent, 10-18 parts of biodegradable additives, 0.1-0.5 parts of xanthan gum, 0.1-0.5 parts of bentonite, 6-40 parts of pearl powder, and the rest of the ingredients are deionized water; The vulcanizing agent is a mixture of di-tert-butyl peroxide isopropylbenzene and triallyl isocyanurate in a mass ratio of 1:0.7 to 1.5, and the liquid silicone cross-linking agent is a blocked isocyanate.

2. The nitrile gloves with pearl luster according to claim 1, characterized in that: The antioxidant is a mixture of 6PPD and KY-616, and the mixing mass ratio is 1:0.6-1.

3. The nitrile gloves with pearl luster according to claim 1, characterized in that: The accelerator is zinc dibutyl dithiocarbamate.

4. The nitrile gloves with pearl luster according to claim 1, characterized in that: The dispersant is polynaphthalenesulfonic acid sodium salt.

5. The nitrile gloves with pearl luster according to claim 1, characterized in that: The degradable additive is polylactic acid.

6. A method for preparing nitrile gloves with pearl luster, characterized in that: The following steps are involved: Step 1, by weight, add 8 to 10 parts of zinc oxide powder, 3 to 6 parts of vulcanizing agent, 0.3 to 4 parts of accelerator, 1 to 3 parts of titanium dioxide, 0.5 to 3 parts of antioxidant powder, 0.1 to 1 part of dispersant powder, 3 to 5 parts of liquid silicone crosslinking agent, 10 to 18 parts of degradable additives and an appropriate amount of water into a dispersion stirring tank, disperse and stir for 10 to 20 hours to prepare a dispersion with a solid content of 45% to 55%; Step 2, grinding the dispersion in a sand mill for 4 to 8 hours until the particle size of the powder in the dispersion is less than or equal to 5 μm, to obtain a nitrile latex auxiliary material for standby use; Step 3, by weight, add 0.1-0.5 parts of xanthan gum, 0.1-0.5 parts of bentonite, and 40-200 parts of deionized water into a dispersion stirring tank, disperse and stir until the xanthan gum and bentonite are completely dissolved, add 6-40 parts of pearl powder, disperse and stir for 1-2 hours, and prepare a pearl powder suspension; Step 4, adding nitrile rubber latex, nitrile latex auxiliary materials, and pearl powder suspension into a dispersion stirring tank, and dispersing and stirring for 1 to 1.5 hours to prepare a slurry for standby use; Step 5: Add 6 to 12 parts of soluble salt, 0.5 to 1.5 parts of release agent and 70 to 90 parts of deionized water into a dispersion stirring tank, and disperse and stir for 10 to 20 minutes to prepare a coagulant solution; Step 6, heating the hand mold to 50-70° C., immersing it in a coagulant solution for 5 minutes, taking it out and drying it, immersing it in a slurry for 10 minutes, taking it out and drying it, immersing it in the slurry again for 5 minutes, taking it out and drying it, and obtaining a nitrile glove; Step 7: vulcanizing, chlorine washing and leaching the nitrile gloves to obtain nitrile gloves with pearl luster.

7. The method for preparing the nitrile gloves having pearl luster according to claim 6, characterized in that: In step 4, the mass ratio of nitrile rubber latex, nitrile latex auxiliary material and pearl powder suspension is 10:0.8-1.5:1.6-3.

0.

8. The method for preparing the nitrile gloves having pearl luster according to claim 6, characterized in that: In step 6, the temperature of the hand mold is always maintained at 50-70° C. when it is immersed in the slurry.

9. The method for preparing the nitrile gloves having pearl luster according to claim 6, characterized in that: In step 5, the soluble salt is one or more of calcium nitrate, calcium chloride, magnesium nitrate, magnesium chloride, zinc nitrate and zinc chloride.

10. The method for preparing nitrile gloves with pearl luster according to claim 6, characterized in that: In step 7, the vulcanization temperature is 65 to 95° C., and the vulcanization time is 0.3 to 0.6 h.

Images