Silicon dioxide-based anti-adhesion agent used for polyolefin thin film and preparation method thereof
A technology of silica and anti-blocking agent, which is applied in the field of silica-based anti-blocking agent for polyolefin film and its preparation, can solve the problem of affecting the printability, heat-sealability and color of plastic film, and affecting the safety of plastic film food packaging materials. It can improve the anti-blocking effect, enhance the anti-blocking effect and improve the compatibility.
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[0023] Example 1
[0024] A preparation method of silica-based anti-blocking agent for polyolefin film, which comprises the following steps:
[0025] Step 1: Mix 18g (18wt%) of distilled water and 28g (28wt%) of absolute ethanol, add 16g (16wt%) of ammonia water, and stir for 20min at 25°C. Under stirring, a mixed solution of 10 g (10 wt%) of ethyl orthosilicate and 28 g (28 wt%) of absolute ethanol was slowly added dropwise to the system. After the addition, the reaction was carried out at 25°C for 4h. Separate the obtained solution with a centrifuge, and the obtained upper milky white solution is SiO 2 Sol. Separate the upper solution and dry to obtain SiO 2 Particles. In this step, the hydrolysis reaction of ethyl orthosilicate occurs, and the reaction process is as follows figure 1 Shown.
[0026] Step two, add 10g of the SiO obtained above 2 The solid particles were added to a mixture of 0.5 g CTAB, 20 g n-octanol and 70 g water, and stirred with a mixer for 4 hours to prepa...
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[0028] Example 2
[0029] A preparation method of silica-based anti-blocking agent for polyolefin film, which comprises the following steps:
[0030] Step 1: Mix 22g (22wt%) of distilled water and 22.5g (22.5wt%) of absolute ethanol, add 20g (20wt%) of ammonia water to it, and stir for 20min at 25°C. A mixed solution of 13 g (13 wt%) of ethyl orthosilicate and 22.5 g (22.5 wt%) of absolute ethanol was slowly added dropwise to the system under stirring. After the addition is complete, react at 25°C for 6h. Separate the obtained solution with a centrifuge, and the obtained upper milky white solution is SiO 2 Sol. Separate the upper solution and dry to obtain SiO 2 Particles. In this step, the hydrolysis reaction of ethyl orthosilicate occurs, and the reaction process is as follows figure 1 Shown.
[0031] Step two, add 10g of the SiO obtained above 2 The solid particles were added to a mixture of 0.6 g SDS, 35 g dodecane and 55 g water, and stirred by a mixer for 6 hours to prepare...
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[0033] Example 3
[0034] A preparation method of silica-based anti-blocking agent for polyolefin film, which comprises the following steps:
[0035] Step 1: Mix 25g (25wt%) of distilled water and 25g (25wt%) of absolute ethanol, add 10g (10wt%) of ammonia to it, and stir for 20min at 25°C. A mixed solution of 15 g (15 wt%) of ethyl orthosilicate and 25 g (25 wt%) of absolute ethanol was slowly added dropwise to the system under stirring. After the addition, the reaction was carried out at 25°C for 8 hours. Separate the obtained solution with a centrifuge, and the obtained upper milky white solution is SiO 2 Sol. Separate the upper solution and dry to obtain SiO 2 Particles. In this step, the hydrolysis reaction of ethyl orthosilicate occurs, and the reaction process is as follows figure 1 Shown.
[0036] Step two, add 10g of the SiO obtained above 2 The solid particles were added to a mixture of 0.8 g SDBS, 50 g hexadecane and 40 g water, and stirred by a mixer for 6 hours to pr...
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