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Preparation method of polystyrene foaming nucleating agent master batch and foaming polystyrene using nucleating agent master batch

A technology of polystyrene foaming and nucleating agent masterbatch, which is applied in the field of expanded polystyrene, which can solve the problems of uneven dispersion of nucleating agents, agglomeration and unevenness of nucleating agents, and facilitate in-situ polymerization , Improve the foaming effect and improve the conversion rate

Pending Publication Date: 2022-03-01
USEON NANJING EXTRUSION MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, during the use of commonly used nucleating agents, as the amount of nucleating agents increases, the nucleating agents are prone to agglomeration, forming larger and uneven particles, which makes the nucleating agents dispersed unevenly. thus affecting the foaming effect

Method used

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  • Preparation method of polystyrene foaming nucleating agent master batch and foaming polystyrene using nucleating agent master batch
  • Preparation method of polystyrene foaming nucleating agent master batch and foaming polystyrene using nucleating agent master batch
  • Preparation method of polystyrene foaming nucleating agent master batch and foaming polystyrene using nucleating agent master batch

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preparation example Construction

[0032] This embodiment provides a method for preparing polystyrene foaming nucleating agent masterbatch, the preparation method comprising the following steps:

[0033] Through the powder wet surface modification method, the surface treatment agent is used to modify the surface of the inorganic particles to obtain modified particles;

[0034] First, add the modified particles, styrene monomer, initiator and comonomer into the prepolymerization device, and under the protection of inert gas, first stir evenly at room temperature, then raise the temperature to 50-160°C, and then stir for 30- 60min, obtain the prepolymer of styrene;

[0035] The styrene prepolymer is added into an extruder to carry out in-situ polymerization reaction to obtain the polystyrene foaming nucleating agent master batch.

[0036] For the inorganic particles mentioned in the preparation method of the polystyrene foaming nucleating agent masterbatch of the present embodiment, inorganic micro-nano particle...

preparation example

[0048] The detection method of grafting rate of modified particles:

[0049] Take 2 grams of modified particles, wash its surface repeatedly with a mixed solvent of 90% ethanol and 10% water in the total weight ratio, remove unreacted coupling agent, dry it, and weigh it W1, and then carry out muffle furnace calcination, remove the coated coupling agent, weigh again as W2, the grafting rate of coupling agent

preparation example 1

[0051] Stir the γ-aminopropyltriethoxysilane that accounts for 20% of the total weight ratio, the ethanol that accounts for 72% of the total weight ratio, and the water that accounts for 8% of the total weight ratio to form a transparent coupling agent stock solution . Add silicon dioxide with an average particle size of 65 nanometers into a high-speed mixer, and slowly spray a coupling agent stock solution accounting for 7.5% by weight of silicon dioxide on the stirring silicon dioxide during stirring. After adding the stock solution of the coupling agent, the material was stirred in a high-speed mixer for another half an hour, and then dried at 120° C. for 2 hours to obtain modified particles. The grafting rate of the modified particles is 1.28%.

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Abstract

The invention relates to a preparation method of a polystyrene foaming nucleating agent master batch and expanded polystyrene using the nucleating agent master batch, and belongs to the technical field of polymer processing.The preparation method of the nucleating agent master batch comprises the following steps that S1, inorganic particles are subjected to surface modification through a surface treating agent, and modified particles are obtained; s2, adding the modified particles, a styrene monomer, an initiator and a comonomer into an extruder for in-situ polymerization reaction to obtain polystyrene foaming nucleating agent master batch; in the step S2, functional groups in the surface treating agent and active functional groups in the comonomer are subjected to grafting reaction. The surface of the nucleating agent master batch is completely coated with polystyrene, and when expanded polystyrene is prepared, the nucleating agent master batch has extremely high dispersity in a matrix, so that the foaming effect is relatively good.

Description

technical field [0001] The present application relates to the technical field of polymer processing, in particular to a preparation method of a polystyrene foaming nucleating agent masterbatch and expanded polystyrene using the nucleating agent masterbatch. Background technique [0002] Foam material is a low-density, but high-strength material, mainly used in aerospace, construction and other industries. The molding of foamed materials is mainly composed of three stages, which are the formation of bubble nuclei, growth and solidification of cells. Among them, the formation stage of bubble nuclei is the most important, which directly affects the number, size and distribution of cells, thus affecting Use of foam. Therefore, in the preparation process of foaming materials, nucleating agents are usually added to accelerate the formation of bubble nuclei. As the amount of nucleating agents increases, the number of cells will also increase, thereby improving the foaming efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/22C08G83/00C08F212/08C08F220/32C08F4/04C08F4/34C08L25/06C08L87/00C08J9/14
CPCC08J3/226C08G83/001C08F212/08C08J9/143C08J2325/06C08J2487/00C08J2203/142C08F4/04C08F220/325
Inventor 李书召陈志强
Owner USEON NANJING EXTRUSION MACHINERY CO LTD
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