Flame-retardant antistatic CR foam and preparation method thereof

Abstract

The invention provides flame-retardant antistatic CR foam and a preparation method thereof. Comprising the following steps: a primary mixing step: mixing 40-60 parts by mass of chloroprene rubber, 5-10 parts by mass of butyl rubber, 5-10 parts by mass of ethylene propylene diene monomer, 1-3 parts by mass of polydimethylsiloxane, 2-4 parts by mass of tetramethyldisilazane and 0.5-1 part by mass of stearyl alcohol, and uniformly stirring; the preparation method comprises the following steps: uniformly mixing and stirring 1-2 parts by mass of acrylic ester, 2-5 parts by mass of dicumyl peroxide, 1-2 parts by mass of plasticizer and 3-6 parts by mass of softening oil, adding the mixture into an internal mixer, and internally mixing for 8-16 minutes at the internal mixing temperature of 100-110 DEG C; a vulcanization filling step; and foaming and forming. The flame-retardant and antistatic CR foam obtained by the preparation method of the flame-retardant and antistatic CR foam is excellent in high temperature resistance, high in flame retardance and excellent in antistatic performance.

Description

Technical Field

[0001] The invention relates to the field of CR foam, in particular to flame-retardant and antistatic CR foam and a preparation method thereof. Background Art

[0002] Foam is a material made of foamed plastic particles, referred to as foam. Foam is divided into PU foam, anti-static foam, conductive foam, EPE, CR, EVA, etc. Foam has a series of characteristics such as good elasticity, light weight, fast pressure-sensitive fixation, easy to use, easy bending, and reliable performance. Foam has good cushioning and sound insulation effects. Foam is widely used in electronics, vehicles, home furnishings and other fields. CR foam is a general-purpose special rubber. In addition to the good physical properties of general rubber, CR foam also has excellent properties such as flame resistance, oil resistance, and chemical corrosion resistance, which makes it occupy an important position among various synthetic rubbers. CR foam is light, tough, high in structural strength, good in heat insulation, does not absorb water, and has good cushioning and chemical resistance stability.

[0003] However, traditional CR foam, such as the technical solution disclosed in the patent with application number CN201920747023.7 and invention name "A patch conductive silicone rubber foam with good shock absorption", has low flame retardant performance and poor antistatic performance. Summary of the invention

[0004] Based on this, it is necessary to provide a flame retardant and antistatic CR foam and a preparation method thereof to address the technical problems that traditional CR foam has low flame retardancy and poor antistatic performance.

[0005] A flame retardant antistatic CR foam and a preparation method thereof, comprising the following steps: Preliminary mixing step: 40 to 60 parts by weight of chloroprene rubber, 5 to 10 parts by weight of butyl rubber, 5 to 10 parts by weight of ethylene propylene diene monomer rubber, 1 to 3 parts by weight of polydimethylsiloxane, 2 to 4 parts by weight of tetramethyldisilazane, 0.5 to 1 parts by weight of stearyl alcohol, 1 to 2 parts by weight of acrylate, 2 to 5 parts by weight of diisopropylbenzene peroxide, 1 to 2 parts by weight of plasticizer, and 3 to 6 parts by weight of softening oil are mixed and stirred evenly, and then added to an internal mixer, and the internal mixer is mixed for 8 to 16 minutes at a temperature of 100 to 110 degrees Celsius; Vulcanization filling step: adding 4 to 6 parts by weight of a vulcanizing agent, 6 to 12 parts by weight of a filler, 5 to 10 parts by weight of a flame retardant, and 0.5 to 1 part by weight of an accelerator to the above-mentioned internal mixer, and mixing for 10 to 20 minutes at a mixing temperature of 110 to 120 degrees Celsius; Foaming molding step: adding 5 to 8 parts by weight of a foaming agent, 1 to 2 parts by weight of an antioxidant, and 0.5 to 1 part by weight of a dispersant to the above-mentioned internal mixer, and mixing for 10 to 20 minutes at a mixing temperature of 110 to 120 degrees Celsius; obtaining a flame-retardant and antistatic CR foam.

[0006] In one embodiment, in the preliminary mixing step, the softening oil includes the following components in parts by weight: 30 to 50 parts of paraffin oil, 20 to 40 parts of silicone oil, and 15 to 35 parts of cyclohexane oil.

[0007] In one embodiment, in the preliminary mixing step, the plasticizer is stearic acid.

[0008] In one embodiment, in the vulcanization filling step, the vulcanizing agent includes the following components in parts by weight: 20 to 40 parts of zinc oxide, 10 to 30 parts of magnesium oxide, 20 to 40 parts of lead oxide, and 10 to 30 parts of lead tetroxide.

[0009] In one embodiment, in the vulcanization filling step, the filler includes the following components in parts by weight: 10 to 30 parts of calcium carbonate, 20 to 40 parts of glass powder, 15 to 25 parts of carbon nanotubes, 16 to 24 parts of kaolin and 12 to 22 parts of silicon powder.

[0010] In one embodiment, in the vulcanization filling step, the flame retardant includes the following components in parts by weight: 24 to 36 parts of triisopropylphenyl phosphate, 16 to 32 parts of aluminum hypophosphite, 14 to 24 parts of diethylaluminum hypophosphite and 15 to 25 parts of antimony trioxide.

[0011] In one embodiment, in the vulcanization filling step, the accelerator is a mixture of accelerator DM and accelerator ZDC.

[0012] In one embodiment, in the foaming molding step, the foaming agent is a mixture of p-toluenesulfonyl hydrazide and carbon black.

[0013] In one embodiment, in the foaming step, the antioxidant is 4,4-bis(2,2-dimethylbenzyl)diphenylamine.

[0014] A flame retardant and antistatic CR foam is prepared by the flame retardant and antistatic CR foam preparation method described in any of the above embodiments.

[0015] The flame retardant antistatic CR foam preparation method is concise and exquisite, and is easy to operate. The flame retardant antistatic CR foam obtained by the flame retardant antistatic CR foam preparation method has excellent high temperature resistance, strong flame retardant performance, high structural strength, good flexibility and excellent antistatic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a flow chart of the flame retardant antistatic CR foam and the preparation method thereof in one embodiment. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth so as to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or position relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0022] See also Figure 1 The present invention provides a flame retardant antistatic CR foam and a preparation method thereof 10, comprising the following steps: Step 101: Preliminary mixing step: 40 to 60 parts by weight of chloroprene rubber, 5 to 10 parts by weight of butyl rubber, 5 to 10 parts by weight of ethylene propylene diene rubber, 1 to 3 parts by weight of polydimethylsiloxane, 2 to 4 parts by weight of tetramethyldisilazane, 0.5 to 1 part by weight of stearyl alcohol, 1 to 2 parts by weight of acrylate, 2 to 5 parts by weight of diisopropylbenzene peroxide, 1 to 2 parts by weight of plasticizer, and 3 to 6 parts by weight of softening oil are mixed and stirred evenly, then added to an internal mixer, and kneaded for 8 to 16 minutes at a kneading temperature of 100 to 110 degrees Celsius.

[0023] In this embodiment, in the preliminary mixing step, the plasticizer is stearic acid.

[0024] Specifically, 45 to 55 parts by mass of chloroprene rubber, 5 to 9 parts by mass of butyl rubber, 6 to 9 parts by mass of ethylene propylene diene monomer rubber, 1.5 to 2.5 parts by mass of polydimethylsiloxane, 2.5 to 3.5 parts by mass of tetramethyldisilazane, 0.6 to 0.8 parts by mass of stearyl alcohol, 1.2 to 1.8 parts by mass of acrylate, 3 to 4 parts by mass of diisopropylbenzene peroxide, 1.2 to 1.8 parts by mass of plasticizer, and 4 to 5 parts by mass of softening oil are mixed and stirred evenly, then added to an internal mixer and kneaded for 10 to 14 minutes at a kneading temperature of 102 to 108 degrees Celsius. Furthermore, 50 parts by mass of chloroprene rubber, 8 parts by mass of butyl rubber, 7 parts by mass of EPDM rubber, 2 parts by mass of polydimethylsiloxane, 3 parts by mass of tetramethyldisilazane, 0.7 parts by mass of stearyl alcohol, 1.5 parts by mass of acrylate, 3.5 parts by mass of diisopropyl peroxide, 1.5 parts by mass of plasticizer, and 4.5 parts by mass of softening oil are mixed and stirred evenly, then added to an internal mixer and kneaded for 12 minutes at a kneading temperature of 105 degrees Celsius.

[0025] Step 102: Vulcanization filling step: add 4 to 6 parts by weight of vulcanizing agent, 6 to 12 parts by weight of filler, 5 to 10 parts by weight of flame retardant, and 0.5 to 1 part by weight of accelerator to the above-mentioned internal mixer, and mix for 10 to 20 minutes at a mixing temperature of 110 to 120 degrees Celsius.

[0026] In this embodiment, the accelerator is a mixture of accelerator DM and accelerator ZDC.

[0027] Specifically, 4.5 to 5.5 parts by mass of a vulcanizing agent, 7 to 11 parts by mass of a filler, 6 to 9 parts by mass of a flame retardant, and 0.6 to 0.9 parts by mass of an accelerator are added to the above-mentioned internal mixer, and the internal mixer is kneaded for 12 to 18 minutes, and the internal mixer temperature is 112 degrees Celsius to 118 degrees Celsius. In this embodiment, 5 parts by mass of a vulcanizing agent, 10 parts by mass of a filler, 8 parts by mass of a flame retardant, and 0.8 parts by mass of an accelerator are added to the above-mentioned internal mixer, and the internal mixer is kneaded for 15 minutes, and the internal mixer temperature is 115 degrees Celsius.

[0028] Step 103: Foaming molding step: add 5 to 8 parts by weight of a foaming agent, 1 to 2 parts by weight of an antioxidant, and 0.5 to 1 part by weight of a dispersant to the above-mentioned internal mixer, and mix for 10 to 20 minutes at a mixing temperature of 110 to 120 degrees Celsius; obtain flame-retardant and antistatic CR foam.

[0029] In this embodiment, the foaming agent is a mixture of p-toluenesulfonyl hydrazide and carbon black. The antioxidant is 4,4-bis(2,2-dimethylbenzyl)diphenylamine.

[0030] Specifically, 6 to 7 parts by weight of a foaming agent, 1.2 to 1.8 parts by weight of an antioxidant, and 0.6 to 0.9 parts by weight of a dispersant are added to the above-mentioned internal mixer, and the internal mixer is kneaded for 12 to 18 minutes at a temperature of 111 to 118 degrees Celsius to obtain a flame-retardant antistatic CR foam. 6.5 parts by weight of a foaming agent, 1.5 parts by weight of an antioxidant, and 0.8 parts by weight of a dispersant are added to the above-mentioned internal mixer, and the internal mixer is kneaded for 15 minutes at a temperature of 115 degrees Celsius to obtain a flame-retardant antistatic CR foam.

[0031] The flame retardant antistatic CR foam preparation method is concise and exquisite, and is easy to operate. The flame retardant antistatic CR foam obtained by the flame retardant antistatic CR foam preparation method has excellent high temperature resistance, strong flame retardant performance, high structural strength, good flexibility and excellent antistatic performance.

[0032] In order to increase the flexibility of the flame retardant antistatic CR foam, in one embodiment, in the preliminary mixing step, the softening oil includes the following components by mass: 30 to 50 parts of paraffin oil, 20 to 40 parts of silicone oil, and 15 to 35 parts of naphthenic oil. The softening oil composed of the above components can increase the flexibility of the flame retardant antistatic CR foam.

[0033] In order to improve the structural strength and stability of the flame retardant and antistatic CR foam, in one embodiment, in the vulcanization filling step, the vulcanizing agent includes the following components in parts by mass: 20 to 40 parts of zinc oxide, 10 to 30 parts of magnesium oxide, 20 to 40 parts of lead oxide, and 10 to 30 parts of lead tetraoxide. The vulcanizing agent composed of the above components can improve the structural strength and stability of the flame retardant and antistatic CR foam.

[0034] In order to further improve the structural strength and structural stability of the flame retardant antistatic CR foam, in one embodiment, in the vulcanization filling step, the filler includes the following components in parts by mass: 10 to 30 parts of calcium carbonate, 20 to 40 parts of glass powder, 15 to 25 parts of carbon nanotubes, 16 to 24 parts of kaolin, and 12 to 22 parts of silicon powder. The filler composed of the above components can further improve the structural strength and structural stability of the flame retardant antistatic CR foam and increase the flame retardant and high temperature resistance of the flame retardant antistatic CR foam.

[0035] In order to improve the flame retardant and high temperature resistance of the flame retardant and antistatic CR foam, in one embodiment, in the vulcanization filling step, the flame retardant includes the following components in parts by mass: 24 to 36 parts of triisopropylphenyl phosphate, 16 to 32 parts of aluminum hypophosphite, 14 to 24 parts of diethyl aluminum hypophosphite, and 15 to 25 parts of antimony trioxide. The flame retardant composed of the above components can improve the flame retardant and high temperature resistance of the flame retardant and antistatic CR foam.

[0036] The present invention also provides a flame retardant antistatic CR foam, which is prepared by the flame retardant antistatic CR foam preparation method described in any of the above embodiments. The flame retardant antistatic CR foam and the preparation method thereof are concise and exquisite, and easy to operate. The flame retardant antistatic CR foam obtained by the flame retardant antistatic CR foam preparation method has excellent high temperature resistance, strong flame retardant performance, high structural strength, good flexibility, and excellent antistatic performance.

[0037] 1000 pieces of the flame retardant antistatic CR foam prepared by the flame retardant antistatic CR foam preparation method were taken for performance testing, and the average test results are shown in the following table:

[0038] The above test results prove that the flame-retardant and antistatic CR foam obtained by the above flame-retardant and antistatic CR foam preparation method has strong flame retardant properties, high structural strength, good flexibility and excellent antistatic properties.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A flame retardant antistatic CR foam and a preparation method thereof, characterized in that: The steps include: Preliminary mixing step: 40 to 60 parts by weight of chloroprene rubber, 5 to 10 parts by weight of butyl rubber, 5 to 10 parts by weight of ethylene propylene diene monomer rubber, 1 to 3 parts by weight of polydimethylsiloxane, 2 to 4 parts by weight of tetramethyldisilazane, 0.5 to 1 parts by weight of stearyl alcohol, 1 to 2 parts by weight of acrylate, 2 to 5 parts by weight of diisopropylbenzene peroxide, 1 to 2 parts by weight of plasticizer, and 3 to 6 parts by weight of softening oil are mixed and stirred evenly, and then added to an internal mixer, and the internal mixer is mixed for 8 to 16 minutes at a temperature of 100 to 110 degrees Celsius; Vulcanization filling step: adding 4 to 6 parts by weight of a vulcanizing agent, 6 to 12 parts by weight of a filler, 5 to 10 parts by weight of a flame retardant, and 0.5 to 1 part by weight of an accelerator to the above-mentioned internal mixer, and mixing for 10 to 20 minutes at a mixing temperature of 110 to 120 degrees Celsius; Foaming molding step: adding 5 to 8 parts by weight of a foaming agent, 1 to 2 parts by weight of an antioxidant, and 0.5 to 1 part by weight of a dispersant to the above-mentioned internal mixer, and mixing for 10 to 20 minutes at a mixing temperature of 110 to 120 degrees Celsius; obtaining a flame-retardant and antistatic CR foam.

2. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the preliminary kneading step, the softening oil includes the following components in parts by mass: 30 to 50 parts of paraffin oil, 20 to 40 parts of silicone oil, and 15 to 35 parts of naphthenic oil.

3. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the preliminary mixing step, the plasticizer is stearic acid.

4. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the vulcanization filling step, the vulcanizing agent includes the following components in parts by mass: 20 to 40 parts of zinc oxide, 10 to 30 parts of magnesium oxide, 20 to 40 parts of lead oxide, and 10 to 30 parts of lead tetraoxide.

5. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the sulfurization filling step, the filler includes the following components in parts by mass: 10 to 30 parts of calcium carbonate, 20 to 40 parts of glass powder, 15 to 25 parts of carbon nanotubes, 16 to 24 parts of kaolin, and 12 to 22 parts of silicon powder.

6. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the vulcanization filling step, the flame retardant includes the following components in parts by mass: 24 to 36 parts of triisopropylphenyl phosphate, 16 to 32 parts of aluminum hypophosphite, 14 to 24 parts of diethylaluminum hypophosphite, and 15 to 25 parts of antimony trioxide.

7. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the vulcanization and filling step, the accelerator is a mixture of accelerator DM and accelerator ZDC.

8. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the foaming molding step, the foaming agent is a mixture of p-toluenesulfonyl hydrazide and carbon black.

9. The flame retardant antistatic CR foam and the preparation method thereof according to claim 1, characterized in that: In the foaming molding step, the antioxidant is 4,4-bis(2,2-dimethylbenzyl)diphenylamine.

10. A flame retardant antistatic CR foam, characterized in that: The flame retardant and antistatic CR foam is prepared by the preparation method of the flame retardant and antistatic CR foam described in any one of claims 1 to 9.

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