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Polyolefin plastic light-biodegradable modified additive as well as preparation and application thereof

A technology of biodegradation and polyolefin, which is applied in the field of polymers, can solve the problems of plastic mechanical properties degradation, affecting plastic degradation performance, uneven distribution of photodegradation, etc., achieve small addition, controllable degradation time, and solve white pollution. Effect

Active Publication Date: 2014-05-28
SHANTOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these additives are all small molecule carboxylates or complexes, if they are more doped, the mechanical properties of plastics will easily decrease; moreover, because the properties of small molecule additives are quite different from those of polyolefins, even if It is also easy to cause uneven distribution in plastics if it is made into a masterbatch with polyolefin in advance
When this kind of finished product undergoes photodegradation, it is easy to cause the place with high additive concentration to decompose too fast or the time is too short, which affects the service life of the plastic; while the place with low concentration or no additive degrades too slowly or does not degrade, Affects the degradation performance of plastics
[0007] In the information disclosed in some patent applications, in addition to adding photodegradation aids such as transition metal organic salts, natural polybasic organic acids (citric acid or fumaric acid, etc.) are also added to make oxidative-biodegradable polymers / plastics to overcome the single The problem of slow biodegradation in the later stage caused by photodegradation, but there are still problems such as uneven distribution of photodegradation mentioned above

Method used

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  • Polyolefin plastic light-biodegradable modified additive as well as preparation and application thereof
  • Polyolefin plastic light-biodegradable modified additive as well as preparation and application thereof
  • Polyolefin plastic light-biodegradable modified additive as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Weigh 100g of polyethylene and put it into the reaction kettle, start stirring, introduce air, and gradually increase the temperature. After reaching 140°C, take samples to measure the acid value and molecular weight every 30 minutes; when the acid value increases to 5mg(KOH) / g or more, Lower the reaction temperature to 130°C and continue the reaction for 16 hours to obtain oxidized polyethylene with an acid value of 30 mg(KOH) / g, whose structural formula is:

[0058]

[0059] For structure verification data see figure 1 .

[0060] Add the above 100g oxidized polyethylene to 100mL xylene and heat to melt, then add the methanol solution of cobalt hydroxide according to the carboxyl group of oxidized polyethylene to cobalt molar equivalent ratio of 2:1 (the volume (or mass) concentration of cobalt hydroxide is 5%) , and reacted at 130°C for 3 hours; the solvent was removed under reduced pressure to prepare a modified oxidized polyethylene containing 1.4% (mass percent...

Embodiment 2

[0066] Weigh 100g of polypropylene and put it into the reaction kettle, start stirring, introduce air, gradually raise the temperature, and after reaching 140°C, take samples at regular intervals to measure the acid value and molecular weight. When the acid value increases to above 5 mg (KOH) / g, lower the reaction temperature to 130°C and continue the reaction for 16 hours to obtain oxidized polypropylene with an acid value of 38 mg (KOH) / g.

[0067] Add a small amount of xylene to the above 100 g of oxidized polypropylene and heat to melt, then add a methanol solution of cerium hydroxide according to the carboxyl group of oxidized polypropylene to cerium molar equivalent ratio of 4:1, and react at 130°C for 3 hours. The solvent was removed under reduced pressure to prepare modified oxidized polypropylene containing 1.8% cerium.

[0068] Mix 1.2 g of the obtained cerium-containing controllable photobiodegradable polypropylene additive with 0.08 g of a polymeric antioxidant or ...

Embodiment 3

[0071] Dissolve 100g of polyolefin and 8g of maleic acid in 100mL of xylene, protect with nitrogen, heat the oil bath to 120°C, add 0.08g of benzoyl peroxide in batches every 20 minutes (0.08g in total), and stir for 5 hours after termination. After cooling to room temperature, about three times the volume of ethanol was poured into the product to obtain a white precipitate. Suction filter with Buchner funnel and soak overnight in acetone. Then dissolve with xylene and carry out secondary precipitation, and repeat the precipitation 2 to 3 times to wash away the residual maleic acid monomer. The product is dried in an oven at 60°C to constant weight to obtain a maleic acid grafted modified polyolefin.

[0072] Add a small amount of xylene to the above 100 g of maleic acid grafted polyolefin and heat to melt, then add nickel hydroxide methanol solution according to the carboxyl group of maleic acid grafted polyolefin to nickel molar equivalent ratio of 2:1, and react at 130°C ...

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Abstract

The invention provides a polyolefin plastic light-bio-degradable modified additive. The polyolefin plastic light-biodegradable modified additive is characterized by having the structural formula as shown in the description. The invention further discloses a preparation method and application of the polyolefin plastic light-bio-degradable modified additive. Because of the special design on the structure, the controllable light biodegradable polyolefin additive disclosed by the invention has high affinity with polyolefin substrates, so that the uniform dispersion of the controllable light biodegradable polyolefin additive in the polyolefin substrates is facilitated; the light-biodegradable modified additive is very high in light-bioactivity, and can also improve the light-bio-degradability of the polyolefin substrates and regulate and control the induction period of degradation. According to the controllable light-biodegradable additive disclosed by the invention, polyolefin plastics can be controlled to be degraded completely within 1.5 to 30 months by controlling the adding proportion of the controllable light-biodegradable additive in the polyolefin substrates, so that the controllable light-biodegradable additive has an extremely high application value.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a controllable photobiodegradation polyolefin additive, a preparation method and application thereof, and a composition containing the controllable photobiodegradation polyolefin additive. Background technique [0002] Polyolefins, which include materials such as polyethylene, polypropylene or polystyrene, are by far the most commonly used class of important general-purpose plastics. Due to the advantages of easy molding, small specific gravity, good mechanical properties, reusability and non-toxicity, polyolefin plastics are widely used in the fields of automobiles, home appliances, daily necessities and disposable film packaging materials. In daily life, the use of polyolefin plastic products accounts for an increasing proportion of the entire plastic products, including a large number of disposable packaging materials such as packaging bags, foam shock-absorbing materials for household...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F110/06C08F112/08C08F255/00C08F8/42C08F8/06C08L23/26C08L23/06C08L23/12C08L25/06C08L23/16C08L47/00C08L27/06
Inventor 陈汉佳宋隆宗石旭华牛海波
Owner SHANTOU UNIV
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