Environment-friendly EVA waterproof coil and preparation method thereof

A kind of waterproof roll material and environment-friendly technology, which is applied in the field of tunnel waterproof materials, can solve the problems of affecting welding performance, separation of mixed phases of powder and granular materials, closed and narrow space of construction tunnels, etc., and achieves good anti-aging performance and flame retardant performance , avoid phase separation and precipitation, and reduce the effect of relative addition amount

Inactive Publication Date: 2018-09-04
铁科腾跃科技有限公司
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Problems solved by technology

[0003] At present, the EVA waterproof membrane on the market mainly has the following disadvantages: 1) Since the main raw material of the EVA waterproof membrane is polyethylene, but the aging resistance and flame retardancy of polyethylene are very poor (among them, the EVA waterproof membrane Aging resistance includes two aspects of photoaging and thermal oxygen aging), so the use effect is poor; although the aging problem of some EVA waterproof membranes has been basically solved, too much attention has been paid to photoaging in the process of solving the aging problem However, in the process of tunnel waterproofing, the waterproofing membrane is mainly based on thermal oxygen aging, so the problem of thermal oxygen aging is still one of the problems that need to be solved. ;2) The limiting oxygen index of polyethylene, the raw material of EVA waterproof membrane, is 17.4%, which is flammable and will continue to burn after leaving the fire source, accompanied by molten dripping. The use of welding will easily cause the waterproof membrane to catch fire, and the space in the construction tunnel is closed and narrow, and the smoke and poisonous gas released by combustion cannot be diffused. Therefore, the flame retardancy of the waterproof membrane is also an urgent problem to be solved; 3) Some waterproof membranes in the market The VA content in the material is low, which seriously affects the welding performance during construction, and the mechanical properties cannot meet the standard requirements
This method uses a twin-screw extruder to evenly disperse the inorganic powdery antioxidant into the polymer resin, but all of them are granulated by twin-screw first and then melt-extruded by single-screw, which causes waste of electricity and manpower. ; At the same time, this patent only pays attention to the anti-oxidation performance, and does not pay attention to the anti-ultraviolet performance and flame retardant performance
[0007] To sum up, it can be seen that the current EVA waterproof board is mostly one of the solutions to the existing problems, but it cannot take into account the anti-aging and flame-retardant properties of mutual confrontation at the same time, and there are also problems due to uneven mixing of powder and pellets. There is a phenomenon of phase separation, which makes it difficult for EVA waterproof membranes to have good performance

Method used

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  • Environment-friendly EVA waterproof coil and preparation method thereof

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preparation example Construction

[0038] A preparation method of an environment-friendly EVA waterproof coiled material, specifically comprising the following steps:

[0039] A. Weigh the corresponding raw materials according to the ratio.

[0040] Before raw material is weighed, at first prepare anti-aging-flame-retardant master batch, the preparation method of anti-aging-flame-retardant master batch comprises the following steps:

[0041] A1. Grind the flame retardant and flame retardant synergist, and pass through a 800 mesh sieve;

[0042] A2. Add flame retardant and flame retardant synergist to a high-speed mixer preheated to 70-90°C, add coupling agent and mix for activation for 5-10 minutes;

[0043] A3. Weigh the light stabilizer, antioxidant, and heat stabilizer according to the proportion and add them to the high-speed mixer and stir for 5-10min;

[0044] A4. Weigh ethylene-vinyl acetate copolymer, metallocene polyethylene and high-density polyethylene respectively according to the proportion and a...

Embodiment 1

[0052] An environmentally friendly EVA waterproof membrane, including the following components by weight: ethylene-vinyl acetate copolymer EVA (VA content 18%) is 30%, metallocene polyethylene mPE is 15%, high-density polyethylene HDPE is 40% %, anti-aging - flame retardant masterbatch 15%. Among them, the anti-aging-flame retardant masterbatch includes the following components by weight: ethylene-vinyl acetate copolymer EVA (VA content 18%) 25%, metallocene polyethylene mPE 5%, high-density polyethylene HDPE 5% , ultraviolet absorber UV-327 is 2%, free radical scavenger LS744 is 1%, hindered phenolic antioxidant 1010 is 3%, secondary antioxidant 168 is 4%, main stabilizer zinc stearate is 5% , co-stabilizer triphenyl phosphite is 2%, flame retardant organic silanolamide is 30%, phosphate ester is 10%, flame retardant synergist magnesium stearate is 5%, silane coupling agent is 1%, EVA wax is 2%.

[0053] The preparation method of this embodiment includes the following steps...

Embodiment 2

[0059] In this example, the environment-friendly EVA waterproof membrane includes the following components by weight: ethylene-vinyl acetate copolymer EVA (28% VA content) is 20%, metallocene polyethylene mPE is 30%, high-density polyethylene HDPE 35%, anti-aging-flame retardant masterbatch 15%. Among them, the anti-aging-flame retardant masterbatch includes the following components by weight fraction: ethylene-vinyl acetate copolymer EVA (VA content 28%) 20%, metallocene polyethylene mPE 5%, high-density polyethylene HDPE 5% , ultraviolet absorber UV-531 is 2%, free radical scavenger LS744 is 1%, hindered phenolic antioxidant 1076 is 5%, secondary antioxidant 168 is 7%, main stabilizer zinc stearate is 5% , co-stabilizer triphenyl phosphite is 2%, flame retardant organic silanolamide is 30%, phosphate ester is 10%, flame retardant synergist magnesium stearate is 5%, silane coupling agent is 1%, EVA wax is 2%.

[0060] The preparation method of this example is the same as th...

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Abstract

The invention discloses an environment-friendly EVA waterproof coil and a preparation method thereof. The environment-friendly EVA waterproof coil is prepared from the following components: an ethylene-vinyl acetate copolymer, metallocene polyethylene, high density polyethylene and anti-aging-flame retardant masterbatch, wherein the anti-aging-flame retardant masterbatch is prepared from the ethylene-vinyl acetate copolymer, the metallocene polyethylene, the high density polyethylene, a light stabilizer, an antioxidant, a heat stabilizer, a flame retardant, a flame retardant synergist, a coupling agent and a dispersing agent. The VA content of the EVA waterproof coil prepared by the invention is greater than or equal to 5 percent; the EVA waterproof coil has the advantages of excellent performance and good welding effects; anti-aging and flame retardant raw materials selected in the components can realize a mutual promotion effect, so that the EVA waterproof coil has good anti-aging properties and flame retardant properties at the same time, and further the quality of the waterproof coil is greatly improved.

Description

technical field [0001] The invention relates to the technical field of tunnel waterproof materials, in particular to an EVA waterproof coiled material and a preparation method thereof. Background technique [0002] EVA waterproof membrane is widely used in the field of tunnel waterproofing because of its excellent processing performance, mechanical properties, water impermeability, low temperature flexibility, and welding performance. [0003] At present, the EVA waterproof membrane on the market mainly has the following disadvantages: 1) Since the main raw material of the EVA waterproof membrane is polyethylene, but the aging resistance and flame retardancy of polyethylene are very poor (among them, the EVA waterproof membrane Aging resistance includes two aspects of photoaging and thermal oxygen aging), so the use effect is poor; although the aging problem of some EVA waterproof membranes has been basically solved, too much attention has been paid to photoaging in the proc...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L23/06C08K5/00C08K5/134C08K5/526C08K5/098C08J3/22
CPCC08J3/226C08J2323/08C08J2423/06C08J2423/08C08K5/00C08K5/098C08K5/134C08K5/526C08K2201/014
Inventor 赵微微张勇刘志周傲耿月张松琦
Owner 铁科腾跃科技有限公司
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