Butyronitrile latex composite material as well as preparation method and application thereof

Abstract

The invention relates to a butyronitrile latex composite material as well as a preparation method and application thereof, and belongs to the technical field of butyronitrile latex. The butyronitrile latex composite material is prepared from the following components in parts by mass: 100 parts of carboxylic butyronitrile latex, 0.25 to 1.5 parts of an emulsifier, 0.5 to 3 parts of an alkaline stabilizer, 0.5 to 3.5 parts of sulfur, 0.3 to 3.5 parts of an accelerant, 0.3 to 2.5 parts of zinc oxide, 0.2 to 2.2 parts of a metal-based cross-linking agent, 0 to 2.5 parts of titanium dioxide and 0.1 to 0.7 part of an anti-aging agent, the metal-based cross-linking agent comprises at least one of aluminum oxide, aluminum hydroxide, sodium metaaluminate and aluminum dihydroxyamino acetate; the mass ratio of the sulfur to the accelerant is 1: (0.5-2). According to the invention, the metal-based cross-linking agent is compounded with other components, and the ratio of sulfur to the accelerant is optimized, so that the cross-linking density of the material is effectively improved, and the composite material can effectively prevent leakage of hydrocarbons and alcohols.

Description

Technical Field

[0001] The invention belongs to the technical field of nitrile latex, and in particular relates to a nitrile latex composite material and a preparation method and application thereof. Background Art

[0002] As the part of the human body that frequently contacts the outside world, the hands are extremely vulnerable to external injuries, including chemical burns, sharp cuts, and puncture injuries from sharp objects. In many occupational fields, especially in laboratory environments, workers often come into contact with various types of chemicals, such as strong acids, strong alkalis, aliphatic hydrocarbons, hydroxides, alcohol solutions, and ketone compounds, which are often highly dangerous. In order to protect hands from harm, wearing gloves has become their first choice.

[0003] However, conventional nitrile gloves currently have good protection against some common chemical reagents, but have poor protection against alkanes and alcohols. Therefore, it is urgent to develop a nitrile glove with excellent protection against alkanes and alcohols. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art and to provide a nitrile latex composite material and a preparation method and application thereof.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a nitrile latex composite material, which comprises the following components by weight: 100 parts of carboxyl nitrile latex, 0.25-1.5 parts of emulsifier, 0.5-3 parts of alkaline stabilizer, 0.5-3.5 parts of sulfur, 0.3-3.5 parts of accelerator, 0.3-2.5 parts of zinc oxide, 0.2-2.2 parts of metal-based cross-linking agent, 0-2.5 parts of titanium dioxide, and 0.1-0.7 parts of antioxidant;

[0007] The metal-based cross-linking agent includes at least one of aluminum oxide, aluminum hydroxide, sodium aluminate, and dihydroxyamino aluminum acetate; the mass ratio of the sulfur to the accelerator is 1:(0.5-2).

[0008] The present invention introduces a metal-based crosslinking agent and zinc oxide for compounding. The aluminum-based group in the metal-based crosslinking agent contains three active sites, which can further improve the crosslinking degree of the composite material after participating in the reaction. The present invention also optimizes the ratio of sulfur to the accelerator. When the latex is crosslinked, the crosslinked single sulfur bonds will be relatively more. The higher the crosslinking degree of the latex, the better the overall polarity of the latex, the higher the crosslinking density of the latex, and the further improved the anti-penetration effect on chemical reagents such as alkanes and alcohols.

[0009] Preferably, the nitrile latex composite material comprises the following components by mass: 100 parts of carboxyl nitrile latex, 0.3-1.0 parts of emulsifier, 1.0-2.5 parts of alkaline stabilizer, 1.0-3.0 parts of sulfur, 0.5-3.0 parts of accelerator, 0.5-2 parts of zinc oxide, 0.3-2.0 parts of metal-based cross-linking agent, 0-2.0 parts of titanium dioxide, and 0.2-0.6 parts of antioxidant;

[0010] Preferably, the mass percentage of acrylonitrile in the nitrile latex is 35%-43%.

[0011] Nitrile latex with high nitrile content can effectively improve the protection against hydrocarbons. This is mainly because the higher the nitrile content in the latex, the greater its polarity. Hydrocarbons are mostly non-polar substances. The greater the polarity gap, the less likely the chemical reagents are to leak. Therefore, high nitrile nitrile latex is preferred.

[0012] In the present invention, the mass ratio of sulfur to accelerator is in the range of any one or both of 1:0.5, 1:1, 1:1.5, and 1:2.

[0013] Preferably, the mass ratio of the metal-based cross-linking agent to the zinc oxide is 1:(0.5-2); more preferably, it is 1:(0.5-1.5).

[0014] Carboxyl nitrile latex contains a certain amount of carboxyl groups, which can cross-link with metal ions in the form of ionic bonds. Trivalent metal ions have one more active site than divalent metal ions, and the degree of cross-linking will be higher after cross-linking with carboxyl groups. Zinc oxide has the function of activating the accelerator to promote the vulcanization reaction. However, if the zinc oxide fraction is too high, it will rob a certain amount of carboxyl sites and thus affect the cross-linking effect of the aluminum-based cross-linking agent. The applicant has found that when the mass ratio of the metal-based cross-linking agent to the zinc oxide is 1: (0.5-2), the composite material has better protective performance. Furthermore, the mass ratio of the metal-based cross-linking agent to the zinc oxide is preferably 1: (0.5-1.5).

[0015] Preferably, the emulsifier comprises sodium dodecyl sulfate.

[0016] Preferably, the alkaline stabilizer comprises potassium hydroxide.

[0017] Preferably, the accelerator comprises an EZ accelerator (zinc diethyldithiocarbamate) and a BZ accelerator (zinc dibutyldithiocarbamate), and the mass ratio of the EZ accelerator to the BZ accelerator is (1-2): (1-2).

[0018] Preferably, the antioxidant comprises a ketone-amine condensate.

[0019] In a second aspect, the present invention provides a nitrile glove, wherein the raw materials for preparing the nitrile glove include the nitrile latex composite material.

[0020] In a third aspect, the present invention provides a method for preparing nitrile gloves, comprising the following steps:

[0021] (1) taking the components of the nitrile latex composite material, mixing them to obtain a premixed nitrile latex;

[0022] (2) immersing the hand model in the coagulation liquid, taking it out, and drying it;

[0023] (3) immersing the dried hand model into the premixed nitrile latex obtained in step (1), taking it out, and drying it;

[0024] (4) leaching, vulcanizing, cooling, washing with chlorine, drying and demoulding the dried hand mold to obtain the nitrile gloves.

[0025] The present invention has the following beneficial effects: the nitrile latex composite material of the present invention has excellent anti-leakage effect on organic chemicals, especially hydrocarbons and alcohols. The present invention adopts a metal-based cross-linking agent to compound with other components, and optimizes the ratio of sulfur to the accelerator, effectively improving the cross-linking density of the material, so that the composite material can effectively prevent the leakage of hydrocarbons and alcohols. DETAILED DESCRIPTION

[0026] To better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be understood by those skilled in the art that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Unless otherwise specified, the experimental methods used in the examples are all conventional methods; the materials, reagents, etc. used, unless otherwise specified, can be obtained from commercial channels.

[0028] Examples 1-17

[0029] The composition of the nitrile latex composite material described in the embodiment of the present invention is shown in Table 1.

[0030] Comparative Examples 1-6

[0031] The difference between the comparative examples and the embodiments is only in the types and proportions of components, as shown in Table 2.

[0032] Among the components described in each embodiment and comparative example,

[0033] The acrylonitrile mass percentage of the carboxylated nitrile latex-1 is 39-43%, LG-NL105, Ningbo LG Yongxing;

[0034] The acrylonitrile mass percentage of the carboxylated nitrile latex-2 is 35-40%, XNBRL-730, Anqing Hualan;

[0035] The emulsifier is sodium dodecyl sulfate, LAS-30, from Jiangsu Qingting;

[0036] The accelerator is composed of an EZ accelerator and a BZ accelerator in a mass ratio of 1:1;

[0037] The antioxidant is a ketone-amine condensate, SM-LW6, Suzhou Shiming;

[0038] Unless otherwise specified, the components and raw materials used in the embodiments and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0039] Table 1 Content of each component in the materials of Examples 1-17 (parts by mass)

[0040]

[0041] Table 2 Content of each component in the materials of Comparative Examples 1-6 (parts by mass)

[0042]

[0043] The nitrile latex material prepared in each embodiment and comparative example is prepared into nitrile gloves. The preparation method of the nitrile gloves comprises the following steps:

[0044] (1) taking the components of the nitrile latex composite material described in Table 1 and Table 2, mixing them to obtain a premixed nitrile latex;

[0045] (2) After washing and drying the hand model, heat it to a certain temperature, immerse it in the coagulation liquid, stay for 3-5 seconds, then take it out and dry it;

[0046] (3) immersing the dried hand model into the premixed nitrile latex obtained in step (1), staying for 3-5 seconds, taking out and drying; immersing the hand model into the premixed nitrile latex obtained in step (1) again, staying for 3-5 seconds, taking out and drying;

[0047] (4) leaching, vulcanizing, cooling, washing with chlorine, drying and demoulding the dried hand mold to obtain the nitrile gloves.

[0048] The obtained nitrile gloves were subjected to performance tests, as follows:

[0049] 1) Vulcanization curve: Use a rotorless rotary vulcanizer to test the vulcanization curve of the formula rubber block at 110°C. The highest torque MH and the lowest torque ML are measured through the vulcanization curve, and the torque growth value is MH-ML;

[0050] 2) Tensile strength and elongation at break: tested according to ASTM D5034-2017 standard method;

[0051] 3) Chemical penetration time: Tested according to EN 16523-1 standard method.

[0052] The test results are shown in Tables 3 and 4.

[0053] Table 3 Mechanical properties test and torque growth value of each embodiment and comparative example

[0054]

[0055]

[0056] Table 4 Chemical penetration performance test of each embodiment and comparative example

[0057]

[0058] It can be seen from the test results of Table 3 and Table 4 that the nitrile gloves made from the nitrile latex composite material of the present invention have excellent mechanical properties and can effectively prevent the leakage of chemicals, especially alcohols and hydrocarbons. Compared with the embodiment, in Comparative Examples 1 and 2, the use of other types of metal-based cross-linking agents cannot effectively increase the cross-linking density of the material, resulting in a decrease in the anti-leakage effect of the material. In Comparative Example 3, the addition of zinc oxide is too much, and in Comparative Example 4, the addition of sulfur is too much, resulting in poor synergy with the remaining components, resulting in a decrease in the performance of the gloves. In Comparative Examples 5 and 6, the ratio of sulfur to accelerator is not good, the compounding effect is not good, and the protective effect of the gloves is also reduced.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A nitrile latex composite material, characterized in that: The composition comprises the following components by weight: 100 parts of carboxyl nitrile latex, 0.25-1.5 parts of emulsifier, 0.5-3 parts of alkaline stabilizer, 0.5-3.5 parts of sulfur, 0.3-3.5 parts of accelerator, 0.3-2.5 parts of zinc oxide, 0.2-2.2 parts of metal-based crosslinking agent, 0-2.5 parts of titanium dioxide, and 0.1-0.7 parts of antioxidant; The metal-based cross-linking agent includes at least one of aluminum oxide, aluminum hydroxide, sodium aluminate, and dihydroxyamino aluminum acetate; the mass ratio of the sulfur to the accelerator is 1:(0.5-2).

2. The nitrile latex composite material according to claim 1, characterized in that The mass percentage of acrylonitrile in the carboxylated nitrile latex is 35%-43%.

3. The nitrile latex composite material according to claim 1, characterized in that The mass ratio of the metal-based cross-linking agent to the zinc oxide is 1:(0.5-2).

4. The nitrile latex composite material according to claim 1, characterized in that The emulsifier includes sodium dodecyl sulfate.

5. The nitrile latex composite material according to claim 1, characterized in that The alkaline stabilizer includes potassium hydroxide.

6. The nitrile latex composite material according to claim 1, characterized in that The accelerators include EZ accelerators and BZ accelerators.

7. The nitrile latex composite material according to claim 7, characterized in that The mass ratio of the EZ accelerator to the BZ accelerator is (1-2): (1-2).

8. The nitrile latex composite material according to claim 1, characterized in that The antioxidant includes a ketone-amine condensate.

9. A nitrile glove, characterized in that: The raw materials for preparing the nitrile gloves include the nitrile latex composite material according to any one of claims 1 to 8.

10. A method for preparing nitrile gloves, characterized in that: The following steps are involved: (1) taking the components of the nitrile latex composite material according to any one of claims 1 to 8, mixing them to obtain a premixed nitrile latex; (2) immersing the hand model in the coagulation liquid, taking it out, and drying it; (3) immersing the dried hand model into the premixed nitrile latex obtained in step (1), taking it out, and drying it; (4) leaching, vulcanizing, cooling, washing with chlorine, drying and demoulding the dried hand mold to obtain the nitrile gloves.

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