Modified polyethylene double-wall l corrugated pipe drying agent and preparation method thereof

A double-wall corrugated pipe and polyethylene technology, which is applied in the field of preparation of modified polyethylene double-wall corrugated pipe desiccant, can solve the problems that the defoamer does not plasticize, cannot be decomposed, and affects the stable production of corrugated pipes, etc., and achieves Strong water absorption, simple production process, and easy-to-master production process

Inactive Publication Date: 2013-04-24
TIANJIN BAOLISHENGNI PLASTIC PIPE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of the purity and crystal form of the calcium oxide defoamer, the defoamer containing calcium oxide is not plasticized and cannot be decomposed, which affects the stable production of bellows

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A preparation method of a modified polyethylene double-wall corrugated pipe desiccant, the steps are as follows:

[0027] ⑴Expanded vermiculite processing: After the expanded vermiculite of 40-100 mesh is processed by the airflow milling unit, the free water on the surface of the vermiculite is removed (generally the surface free water is 0.5-0.7) and the vermiculite powder of 800-1200 mesh is reached, of course , Expanded vermiculite can be replaced by mica, talcum powder and sepiolite with expanded vermiculite structure.

[0028] (2) Mixing: Add in turn to the 800-1200 mesh vermiculite powder:

[0029] ① The oleic acid content of 95% oleic acid accounts for 1 to 10% by weight of the vermiculite powder;

[0030] ② EVA resin particles or emulsions with a particle diameter of 2.5-3.5mm accounting for 1-5% of the vermiculite powder by weight;

[0031] ③ Polyethylene resin (PE) particles with a particle diameter of 2.5-3.5mm accounting for 5-15% by weight of the vermicul...

example 1

[0038] ⑴Expanded vermiculite processing: After the expanded vermiculite with a size range of 40-100 mesh is processed by a jet mill, the free water on the surface of the vermiculite is removed, and the vermiculite powder reaches 1000 mesh.

[0039] (2) Mixing: Add in turn to the 1000 mesh vermiculite powder:

[0040] 1. Oleic acid whose oleic acid content is 95% is 5% by weight of vermiculite powder;

[0041] 2. Accounting for 2.5% by weight of vermiculite powder, EVA resin particles with a particle diameter of 3 mm;

[0042] ③ Polyethylene resin (PE) particles with a particle diameter of 3mm accounting for 10% by weight of the vermiculite powder;

[0043] (3) Mixing and heating: Mix the mixture formed in the above (2) step in a mixer at 200-260 rpm, mix and stir, and heat up with friction until the mixture is heated to 50°C;

[0044] ⑷ Formation of water-absorbing complex:

[0045] ① Add sodium silicate powder with a particle diameter of 600 meshes, accounting for 10% by w...

example 2

[0050] ⑴ Mica processing: After processing 40-100 mesh mica through the airflow milling unit, the free water on the mica surface is removed, and the mica powder reaches 800 mesh,

[0051] ⑵ Mixing: Add in sequence to the 800 mesh mica powder:

[0052] 1. Oleic acid whose oleic acid content is 95% is 1% by weight of mica powder;

[0053] ② EVA resin particles with a particle diameter of 2.5mm that account for 1% of the mica powder by weight;

[0054] ③ Polyethylene resin (PE) particles with a particle diameter of 2.5mm accounting for 5% by weight of the mica powder;

[0055] (3) Mixing and heating: put the mixture formed in the above (2) step into a mixer at 200 rpm, mix and stir, and mix and stir to heat up by friction until the temperature of the mixture rises to 40°C;

[0056] ⑷ Formation of water-absorbing complex:

[0057] ① Add sodium silicate powder with a particle diameter of 400 meshes, accounting for 3% by weight of mica powder, to the mixture heated to 40°C in ste...

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Abstract

The invention discloses a preparation method for modified polyethylene double-wall l corrugated pipe drying agent. The preparation method comprises the following steps: an expanded vermiculite processing step, wherein the expanded vermiculite is processed into vermiculite powder of 800-1200 meshes by a jet mill; and the vermiculite powder is added with 1%-10% of oleic acid, 1%-5% of EVA (Ethylene-Ethyl Acetate) resin particles or EVA emulsion and 5%-15% of polyethylene resin particles in percentage by weight; a mixing and heating-up process, wherein the formed mixture is put to a mixer with the speed of 200-260 revolutions / minute for mixing, stirring, fractioning and heating up to 40 DEG C to 60 DEG C; a water-absorbing composite forming step, wherein the mixture is added with 3%-17% of sodium silicate powder in percentage by weight, the mixture added with the sodium silicate powder is put to the mixer with the speed of 200-260 revolutions / minute for stirring and mixing until the temperature is 80 DEG C to 110 DEG C, and then cooled to 40-45 DEG C; and a pelletizing step. The drying agent disclosed by the invention has the advantages that the water absorption capability is strong, the materials are easy to prepare, the price is low, the energy consumption in the process is less, the investment is small, and the operation is simple.

Description

technical field [0001] The invention belongs to the technical field of production of polyethylene double-wall corrugated pipes, in particular to a preparation method of a modified polyethylene double-wall corrugated pipe desiccant. Background technique [0002] At present, polyethylene corrugated pipes are widely used in urban drainage, rainwater collection, reclaimed water recycling, and alkali drainage in saline-alkali land, with a wide range of applications. [0003] The production process of traditional polyethylene corrugated pipes includes the mixing of plastic granules, a small amount of additive granules and appropriate filler granules, plasticizing extrusion, vacuum forming, cooling and qualitative cutting. However, in the production of double-wall corrugated pipes, due to moisture Exceeding the standard (generally the water content below 0.5%) will make the production unstable and the yield rate will drop; the commonly used method is to add a defoamer containing ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08K7/26C08K3/34
Inventor 张春龙张德江孔庆和叶建强吴江
Owner TIANJIN BAOLISHENGNI PLASTIC PIPE MFG
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