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A kind of preparation method of curing coated flame retardant waterproofing agent for plastics
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A technology of waterproofing agent and curing agent, applied in the field of plastics, can solve the problems of unstable plastic quality, poor waterproof performance, hazards and so on
Active Publication Date: 2022-05-06
广东精一塑胶实业有限公司
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However, the quality of modified plastics on the market is not stable, and the waterproof performance is not good, especially some electronic products used outdoors, such as outdoor units of air conditioners, outdoor electrical boxes, mobile phones, etc., are still prone to damage if they are exposed to wind and rain for a long time. It will cause leakage and cause harm, so it must have good waterproof
[0004] In order to solve the above problems, the existing improvement is to add flame retardants or waterproofing agents to the plastic formula, but the dispersion of flame retardants or waterproofing agents in polyethylene, polypropylene, etc. Poor performance and washability, unable to maintain the flame retardant and waterproof performance of plastic for a long time
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Embodiment 1
[0027] see Figure 1-2 Shown, the preparation method of flame retardant waterproofing agent is:
[0028] The first step is to add 2.1-2.2mol of phosphorus oxychloride and 1mol of dipropylene glycol into the reaction kettle, replace the air in the reaction flask with nitrogen gas, raise the temperature to 70-75°C while stirring, and keep the temperature for 3 hours. Naturally cooled to room temperature, filtered, washed with anhydrous diethyl ether at 2-10°C for 3-5 times, and dried in vacuum to obtain compound a with a yield of 96.4%;
[0029] The mass spectrum result of compound a is: HRMSm / z (ESI + )calcdforC 6 h 10 Cl 2 o 7 P 2 ([M+1]),327.9716;
[0030] In the second step, 20mmol4,4'-(propane-2,2-diyl)bis(2-allylphenol), 0.5-1mmol metal platinum catalyst Pt(PPh 3 ) 4 Add 300-400ml of xylene into the reaction kettle, replace the air in the reaction kettle with nitrogen, heat to 80-90°C, stir for 15-20min, add 20.5-21mmol bistrimethylsiloxymethylsilane, and raise th...
Embodiment 2
[0034] The preparation method of cured coating flame retardant waterproofing agent:
[0035] Put 100g of flame retardant water repellent (prepared in Example 1) and 1L of solvent absolute ethanol into the reaction kettle, heat to 55°C in a water bath, add 3g of epoxy resin, continue to heat up to 80°C, add 1g of curing agent p-phenylenediamine, Stir slowly and react for 40 minutes, cool naturally to room temperature, filter and dry to obtain a solidified coating flame retardant waterproof agent.
Embodiment 3
[0037] The preparation method of cured coating flame retardant waterproofing agent:
[0038] Put 100g of flame retardant water repellent (prepared in Example 1) and 1L of solvent absolute ethanol into the reactor, heat to 60°C in a water bath, add 6g of epoxy resin, continue to heat up to 75°C, add 1g of curing agent m-toluenediamine, Stir slowly and react for 40 minutes, cool naturally to room temperature, filter and dry to obtain a solidified coated flame retardant waterproof agent.
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Abstract
The invention discloses a method for preparing a curing-coated flame-retardant waterproofing agent for plastics. First, the flame-retardant waterproofing agent is prepared, and phosphorus oxychloride and dipropylene glycol are used as starting materials, which are obtained through substitution and ring formation. Compound a; with 4,4'-(propane-2,2-diyl)bis(2-allylphenol) and bistrimethylsiloxymethylsilane as raw materials, in metal platinum catalyst Pt(PPh 3 ) 4 Under the catalysis of the catalyst, a hydrosilylation reaction occurs, and the compound b is obtained; the compound a and the compound b are substituted and polymerized to obtain the polymer flame retardant waterproof agent m; finally, under the action of the curing agent, the epoxy resin cures the polymer The flame retardant waterproof agent m is coated to prepare a cured coated flame retardant waterproof agent; due to the great affinity between epoxy resin and polypropylene molecules, the cured coated flame retardant waterproof agent coated and compounded can It is well dispersed in propylene, and the flame retardant and waterproof agent is not easy to precipitate, which can maintain the flame retardant and waterproof properties of plastics for a long time.
Description
technical field [0001] The invention belongs to the technical field of plastics, and in particular relates to a method for preparing a cured and coated flame-retardant waterproofing agent for plastics. Background technique [0002] As one of the five general-purpose plastics, polypropylene is second only to polyethylene and polyvinyl chloride in output and consumption, and is an important raw material in the plastics processing industry at present. Because of its low relative density, good chemical properties, good electrical insulation, high temperature resistance, easy processing, and corrosion resistance, it is widely used in industries such as automobiles, medicine, home appliances, food packaging, and construction. However, the oxygen index of polypropylene is only 17%-18%, which is less than 21%. It can continue to burn after leaving the fire, and it is a flammable polymer material. [0003] Because plastic has the advantages of light weight, no rust, and good insulat...
Claims
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