A kind of preparation method of heavy metal analysis standard substance of modified polyvinyl chloride and ABS mixture
A polyvinyl chloride, analysis standard technology, applied in the field of preparation of modified polyvinyl chloride and ABS mixture heavy metal analysis standard material, can solve the problem of affecting the aging resistance of resin, soft and difficult to grind into uniform powder, colloidal particles are easy to be heated, etc. problems, achieve high production efficiency, ensure uniformity, and good dispersion
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[0016] A kind of preparation method of modified polyvinyl chloride and ABS mixture heavy metal analysis standard substance, its steps are:
[0017] a. Put the weighed white polyvinyl chloride (PVC) granules and the terpolymer (ABS) granules of acrylonitrile, butadiene and styrene into the vacuum heating mixer according to the mass ratio, and prepare the heavy metal content according to the needs. , put in the analytically pure heavy metal salt of the heavy metal content, add 3-5 times the tetrahydrofuran solution of solid matter and a small amount of diffusing agent and toner, and soak for 1-2 hours. Keep the vacuum tank tightly closed, start the vacuum heating mixer slowly, and stir quickly for 1-2 hours to completely dissolve the plastic mixture and mix evenly. This process is to make the heavy metal salt and pigment evenly diffuse into the plastic.
[0018] b. Turn off the mixer, take out the plastic mixture from the vacuum heating tank, and apply it on a glass plate to for...
Embodiment 1
[0024] Example 1 (making a sample with a content of about 500mg / kg in 1Kg):
[0025] a, weigh 0.5Kg of white polyvinyl chloride and 0.5Kg of acrylonitrile, butadiene and styrene terpolymer into a vacuum heating mixer, gradually drop into 3g of lead stearate, 3g of barium chromate, stearic acid Cadmium 6g, mercury chloride 0.9g powder, and add about 5L of tetrahydrofuran solution and a small amount of diffusion agent and toner, soak for 1-2 hours. Slowly start the vacuum mixer and stir rapidly for 1-2 hours to completely dissolve the mixture and mix well. This process is for the even diffusion of heavy metal salts and pigments into the plastic.
[0026] b. Turn off the mixer, take out the plastic mixture from the vacuum heating tank, and apply it on a glass plate to form a plastic film. Place the glass plate in a drying oven with the temperature controlled at 50-60°C and dry for about 2 hours to completely evaporate the solvent.
[0027] c. Remove the dried and volatilized p...
Embodiment 2
[0029] Embodiment 2 (making 1Kg content is about the sample of 200mg / kg):
[0030] a. Weighing 0.5Kg of white polyvinyl chloride and 0.5Kg of acrylonitrile, butadiene and styrene terpolymer into a vacuum heating mixer, gradually adding 1.2g of lead stearate, 1.2g of barium chromate, hard Add 2.4g of cadmium fatty acid and 0.36g of mercury chloride, add about 5L of tetrahydrofuran solution and a small amount of diffusing agent and toner, and soak for 1-2 hours. Keep the vacuum tank tightly closed, and slowly start the vacuum heating mixer, stirring rapidly for 1-2 hours, so that the mixture is completely dissolved and mixed evenly. This process is for the even diffusion of heavy metal salts and pigments into the plastic.
[0031] b. Turn off the mixer, take out the plastic mixture from the vacuum heating tank, and apply it on a glass plate to form a plastic film. Place the glass plate in a drying oven with the temperature controlled at 50-60°C and dry for about 2 hours to com...
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