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A kind of preparation method of winding forming composite thermal insulation air duct

A composite thermal insulation and winding molding technology, which is applied to tubular objects, applications, and other household appliances, etc., can solve the problems of slow winding molding process, mismatching speed of foaming molding and winding molding, etc., achieve low porosity, improve bending resistance Performance, the effect of improving wear resistance

Active Publication Date: 2021-11-16
INT CENT FOR BAMBOO & RATTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the molding process of foamed materials, the winding molding process is slow, and the speed of foaming molding and winding molding does not match. How to realize the simultaneous molding of the two is one of the important technical problems to be solved in this patent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of the winding-molded composite heat-insulating air duct of this embodiment, the winding-forming composite heat-insulating air duct includes a glass fiber inner lining layer, a transition layer, an air duct insulation layer and an outer protective layer arranged in sequence from the inside to the outside. The preparation method for:

[0026]S1. Preparation of high-temperature toughened phenolic foaming system: Mix phenol, formaldehyde, furfural, hydrochloric acid and modifier at a mass ratio of 100:70:20:5:10, then mix and react at 50°C for 30 minutes , and then reduce the reaction at a temperature of 90°C for 20 minutes, adjust the pH to 7.0 to obtain a modified phenolic resin, and the modified phenolic resin, surfactant, curing agent, foaming agent and auxiliary agent in mass ratio are 100:7:13:5:8 After mixing evenly, a high-temperature toughened phenolic foaming system is obtained; the modifier is tung oil; the surfactant is Tween 80; the curi...

Embodiment 2

[0035] The preparation method of the winding-molded composite heat-insulating air duct of this embodiment, the winding-forming composite heat-insulating air duct includes a glass fiber inner lining layer, a transition layer, an air duct insulation layer and an outer protective layer arranged in sequence from the inside to the outside. The preparation method for:

[0036] S1. Preparation of high-temperature toughened phenolic foaming system: Mix phenol, formaldehyde, acetaldehyde, hydrochloric acid and modifier at a mass ratio of 100:70:30:6:12, then mix and react at a temperature of 50°C 20min, and then reduce the reaction for 30min at a temperature of 85°C, adjust the pH to 7.5 to obtain a modified phenolic resin, and mix the modified phenolic resin, surfactant, curing agent, foaming agent and auxiliary agent by mass ratio 100:8:12:6:8 After mixing evenly, a high-temperature toughened phenolic foaming system is obtained; the modifier is linseed oil; the surfactant is Tween 80...

Embodiment 3

[0045] The preparation method of the winding-molded composite heat-insulating air duct of this embodiment, the winding-forming composite heat-insulating air duct includes a glass fiber inner lining layer, a transition layer, an air duct insulation layer and an outer protective layer arranged in sequence from the inside to the outside. The preparation method for:

[0046] S1. Preparation of high-temperature toughened phenolic foaming system: Mix phenol, formaldehyde, furfural, hydrochloric acid and modifier at a mass ratio of 100:60:35:6:8, then mix and react at 40°C for 30 minutes , and then reduce the reaction at a temperature of 90°C for 20 minutes, adjust the pH to 7.0 to obtain a modified phenolic resin, and the modified phenolic resin, surfactant, curing agent, foaming agent and auxiliary agent in mass ratio are 100:9:10:5:6 After mixing evenly, a high-temperature toughened phenolic foaming system is obtained; the modifier is nitrile; the surfactant is emulsifier OP-10; t...

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Abstract

The invention provides a preparation method of winding and forming composite thermal insulation air duct. The method is as follows: after impregnating the glass fiber with an epoxy resin system, reciprocatingly winding it on the mandrel of the air duct mold to form a glass fiber inner lining layer, uninterruptedly Continue to use reciprocatingly wound glass fibers and at the same time increase the impregnation of plant fibers into the high-temperature toughened phenolic foaming system, and then reciprocally wind them on the glass fiber inner liner to form a transition layer, stop using glass fibers, and continue to use the impregnated The plant fibers of the high-temperature toughened phenolic foam system are reciprocally wound to form the air duct insulation layer. After the outer shell mold of the air duct mold is set, the core mold is heated to cure the epoxy resin system in the pre-finished insulation air duct, and the high temperature increase The tough phenolic foam system is foamed and molded, cooled to room temperature, and finally the insulation air duct is obtained. The thermal insulation air duct prepared by the invention is light in weight, quiet in sound and good in thermal insulation performance, low in air leakage per unit area, strong in wind pressure resistance, and excellent in bending resistance and deformation resistance.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation air ducts, and in particular relates to a preparation method of winding and forming composite thermal insulation air ducts. Background technique [0002] In HVAC projects, in order to reduce energy loss, it is required to insulate the equipment and pipelines that transport hot and cold media. Therefore, the insulation of pipelines has always been an important content in design and construction. The superior thermal insulation performance of the air duct is not only beneficial to meet the needs of the building environment or the gas transportation process, but also to evaluate the gas transportation quality, such as constant gas temperature, airflow velocity and direction, which is an important evaluation index for providing a high-quality indoor environment. At the same time, it also effectively saves energy consumption, and effective heat preservation measures can solve more than 50% o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/04B29C44/06B29C44/12B29C44/34B29C70/34B29C70/54C08L61/14C08L97/02C08K7/14C08J9/14C08L63/00B29L23/00
CPCB29C44/04B29C44/06B29C44/1209B29C44/34B29C70/34B29C70/54B29L2023/22C08J9/141C08J2203/14C08J2203/182C08J2361/14C08J2497/02C08K7/14C08L61/14C08L97/02C08L63/00
Inventor 程海涛张文福顾少华郑海军王戈
Owner INT CENT FOR BAMBOO & RATTAN