A kind of tpu film with controllable degradation time and preparation method thereof

A degradation time, film technology, applied in the fields of botanical equipment and methods, flat products, other household appliances, etc., can solve problems such as affecting growth and failing to achieve controllable degradation time.

Active Publication Date: 2017-11-17
雄林(越南)责任有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two TPU mulch films can be completely degraded, they cannot achieve the purpose of controlling the degradation time. Some crops need to completely degrade the mulch film within a year or a few months, otherwise the growth will be affected. The above two TPU films cannot be achieved.

Method used

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  • A kind of tpu film with controllable degradation time and preparation method thereof
  • A kind of tpu film with controllable degradation time and preparation method thereof
  • A kind of tpu film with controllable degradation time and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The raw material of the TPU of grafting PLA comprises by molar ratio in the present embodiment:

[0051]

[0052] Calculated as 10 parts by weight of diisocyanate, the raw materials also include:

[0053]

[0054]

[0055] The present embodiment adopts following method to carry out the preparation of TPU film:

[0056] (1) Mix diisocyanate, polyester diol, mixed chain extender, lubricant, catalyst, filler, light stabilizer, oxidation stabilizer and heat stabilizer evenly, heat to 175-185°C, and extrude through a single screw Extrude out of the machine to form TPU melt;

[0057] (2) Dissolve PLA in a tetrahydrofuran solution with a concentration of 0.5 mol / L, heat up to 65°C after introducing an inert gas, and reflux at a constant temperature. Add the initiator and TPU melt in 4 times within 5 minutes, and the amount added at the last time is equal to The amount added at the previous time; wash with distilled water, repeat three times, each time greater than o...

Embodiment 2

[0060] The raw material of the TPU of grafting PLA comprises by molar ratio in the present embodiment:

[0061]

[0062] Calculated as 10 parts by weight of diisocyanate, the raw materials also include:

[0063]

[0064]

[0065] The present embodiment adopts following method to carry out the preparation of TPU film:

[0066] (1) Mix diisocyanate, polyester diol, mixed chain extender, lubricant, catalyst, filler, light stabilizer, oxidation stabilizer and heat stabilizer evenly, heat to 175-185°C, and extrude through a single screw Extrude out of the machine to form TPU melt;

[0067] (2) Dissolve PLA in a tetrahydrofuran solution with a concentration of 2.5 mol / L, heat up to 75°C after passing through an inert gas, reflux at a constant temperature, add the initiator and TPU melt in 4 times within 5 minutes, and the amount added at the last time is greater than The amount added in the previous time; washed with distilled water, repeated 5 times, each time greater th...

Embodiment 3

[0070] The raw material of the TPU of grafting PLA comprises by molar ratio in the present embodiment:

[0071]

[0072] Calculated as 10 parts by weight of diisocyanate, the raw materials also include:

[0073]

[0074]The present embodiment adopts following method to carry out the preparation of TPU film:

[0075] (1) Mix diisocyanate, polyester diol, mixed chain extender, catalyst, lubricant, light stabilizer, oxidation stabilizer and heat stabilizer evenly, heat to 175-185°C, and extrude through a single-screw extruder Form TPU melt;

[0076] (2) Dissolve PLA in a tetrahydrofuran solution with a concentration of 2.5mol / L, heat up to 75°C after passing through an inert gas, and reflux at a constant temperature. Add the initiator and TPU melt in 4 times within 5 minutes, and the amount added at the last time is equal to The amount added at the previous time; wash with distilled water, repeat three times, each time greater than or equal to 10min, to obtain TPU grafted...

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Abstract

The invention relates to a TPU thin film with controllable degradation time and a preparation method thereof. The TPU thin film comprises a TPU thin film layer and an antibacterial agent layer covering the outer part of the TPU thin film, wherein the raw material of the TPU thin film layer comprises TPU grafted with PLA; the isocyanate index of the TPU thin film layer is smaller than 1; raw materials of the antibacterial agent layer comprise quaternary phosphonium salt and / or quaternary ammonium salt. The preparation method comprises the following steps: adding the TPU grafted with the PLA into liquid-state quaternary phosphonium salt and / or quaternary ammonium salt to be immersed; and extruding the TPU by an extruding machine to obtain the TPU thin film. According to the TPU thin film provided by the invention, the degradation time is controllable and the TPU thin film can be completely degraded into H2O and CO2 which have no pollution to the environment, so that the TPU thin film is suitable for being popularized and applied in a large scale.

Description

technical field [0001] The invention relates to the field of polymer synthetic materials, in particular to a TPU film with controllable degradation time and a preparation method thereof. Background technique [0002] TPU (Thermoplastic polyyrethane, thermoplastic polyurethane) is a new type of organic polymer synthetic material. The English trade name is: Flexible polyurethane. The group city is characterized by repeating urethane groups, and also contains other groups such as ester bonds and ether bonds; from the molecular structure, it is composed of rigid chain segments and flexible chain segments alternately. This special molecular structure makes TPU has excellent properties unmatched by other thermoplastic elastic materials, such as high wear resistance, impact resistance, oil resistance and chemical resistance. [0003] In agricultural production, plastic film is mostly used to maintain soil moisture, improve water use efficiency, improve the growth environment of cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04
CPCA01G13/0275B29B15/00B29C48/022B29L2007/002C08G18/3203C08G18/3206C08G18/4202C08G18/4283C08G18/664
Inventor 何建雄王一良
Owner 雄林(越南)责任有限公司
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