Nano composite foaming agent for preparing polyurethane and preparation method thereof

A nano-composite, foaming agent technology, applied in the field of foaming agent, can solve the problems of foaming efficiency and quality reduction, difficulty in controlling cell size, uneven distribution, etc., to reduce local foaming dosage and good interface compatibility Sex, to avoid the effect of local overheating

Inactive Publication Date: 2021-04-20
江苏威久科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing foaming agent for polyurethane has a large particle size and uneven distribution, which causes local overheating, is d

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The invention provides a nanocomposite foaming agent for preparing polyurethane, comprising the following raw materials in parts by weight: 80 parts of 4,4-oxobisbenzenesulfonyl hydrazide, 30 parts of modified nano silicon dioxide and layered montmorillonite 20 servings.

[0028] In a preferred embodiment, the layered montmorillonite is calcium-based montmorillonite, and the particle size of the layered montmorillonite is 20-70um.

[0029] The present invention also provides a preparation method for preparing a nanocomposite foaming agent for polyurethane, the specific preparation steps are as follows:

[0030] Step 1: Preparation of modified nano-silica

[0031] Weigh a certain amount of mesoporous silica and use the salt impregnation method to expand the pores. After the expansion treatment, add copolymers for grafting reaction, add n-octanol to the grafted product, heat and reflux for 4 hours, and heat and reflux Extract with acetone for 9 hours, and dry at 65°C fo...

Embodiment 2

[0042]The difference from Example 1 is that the following raw materials are included in parts by weight: 100 parts of 4,4-oxobisbenzenesulfonyl hydrazide, 40 parts of modified nano silicon dioxide and 25 parts of layered montmorillonite.

Embodiment 3

[0044] The difference from Examples 1-2 is that the following raw materials are included in parts by weight: 120 parts of 4,4-oxobisbenzenesulfonyl hydrazide, 50 parts of modified nano silicon dioxide and 30 parts of layered montmorillonite.

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Abstract

The invention discloses a nano composite foaming agent for preparing polyurethane, and particularly relates to the technical field of foaming agents, and the nano composite foaming agent comprises the following raw materials: 4, 4-oxo-bis (benzenesulfonyl) hydrazine, modified nano silicon dioxide and layered montmorillonite. The mesoporous silica is subjected to polymer grafting reaction after pore expansion treatment, so that the mesoporous silica has super-large mesoporous channels, the mesoporous silica has excellent dispersity and good interfacial compatibility, and then n-octyl alcohol is added to modify the mesoporous silica and acetone. The nano composite foaming agent can be more uniformly dispersed into polyurethane to reduce the local foaming agent amount, and the nano composite foaming agent provided by the invention not only has small particle size, but also has high loading capacity on a chemical foaming agent, so that microporous foamed plastic with better foaming quality can be obtained.

Description

technical field [0001] The invention relates to the technical field of foaming agents, more specifically, the invention relates to a nanocomposite foaming agent for preparing polyurethane and a preparation method thereof. Background technique [0002] In the field of polymer technology, polyurethane foam is currently the most commonly used polymer thermal insulation material. It has many advantages such as light weight, high strength, and thermal conductivity. It has been widely used in building energy-saving materials, automotive interiors, refrigeration insulation materials, Freezers and other specific areas. An important parameter to measure the excellent thermal insulation performance of polyurethane foam is the thermal conductivity. The heat conduction of polyurethane foam mainly depends on three ways: gas phase conduction in the cell, solid phase conduction in the foam body and heat radiation. When the temperature is low, the thermal radiation heat transfer is extrem...

Claims

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Application Information

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IPC IPC(8): C08J9/10C08L75/04C08K9/04C08K7/26C08K9/02C08K9/00C08K3/34
Inventor 王新黄广晋周楚凡史文贞
Owner 江苏威久科技发展有限公司
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