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Preparation method of modified phenolic resin and application thereof

A phenolic resin, modified technology, applied in the field of preparation of modified phenolic resin, can solve the problems of application limitation, low production efficiency, easy to fall off, etc.

Inactive Publication Date: 2010-07-07
上海虞城新型建材有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane foam, polystyrene foam, etc. are easy to burn in case of fire, and produce toxic and harmful gases when burning. When a fire accident occurs, it will cause casualties and property losses, thus limiting their wide use.
Phenolic resin foam has been widely valued for its advantages of heat resistance, flame retardancy, self-extinguishing, flame penetration resistance, and no dripping in case of fire, but at this stage it can only be made into plates, resulting in higher cost than polystyrene foam , the application is limited, so developers and design units generally do not choose this material
[0003] At present, the production of phenolic foam mainly adopts expandable phenolic resin, foaming agent and curing agent, and is heated and foamed after rapid mixing and mixing. More than 12 hours to cure, resulting in low production efficiency
Moreover, the cost is high, especially some projects require on-site construction, and the construction cannot be completed by heating and foaming.
Especially in terms of external wall insulation, it is not possible to use on-site spraying like polyurethane foam, but to use EPS board construction methods, and use adhesives to stick to the wall. The construction efficiency is low, the cost is high, the sticking is not firm, and it is easy to fall off.
Therefore, it is limited in terms of external wall insulation and on-site construction.

Method used

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  • Preparation method of modified phenolic resin and application thereof
  • Preparation method of modified phenolic resin and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Preparation of modified phenolic resin:

[0024] Put 85g of phenol, 15g of cardanol, and 250g of formaldehyde (37wt%) into a three-necked beaker, adjust the pH to 8-9 with sodium hydroxide, stir and raise the temperature to 85°C, control the temperature at 85-95°C, react for 2 hours, then add 10 g of urea was reacted for 1 hour, adjusted to pH = 6.5-7.0 with hydrochloric acid, vacuum dehydrated, and the solid content reached 85 wt%. Cool down to normal temperature, measure the viscosity to 2.5Pa·s, add 4g of fatty alcohol polyoxyethylene ether, 7g of n-pentane, stir for 20 minutes, discharge, and pack.

[0025] 2) Preparation of composite curing agent:

[0026] Put 10g of phosphoric acid, 80g of sulfuric acid, and 10g of p-toluenesulfonic acid into a three-necked flask, stir for 20 minutes, wait until the p-toluenesulfonic acid is completely dissolved, discharge, and pack.

[0027] Take 100g of modified phenolic resin, mix with 12g of composite curing agent, and sp...

Embodiment 2

[0029] 1) Preparation of modified phenolic resin:

[0030] Add 90g of industrial phenol, 10g of cardanol, and 200g of formaldehyde (37wt%) into a three-necked flask, and stir with sodium hydroxide strips at pH=8-9 to raise the temperature to 85°C. Control the temperature at 85°C to 95°C, react for 2 hours, add 8g of urea, react for 1 hour, adjust the pH to 6.5 to 7 with hydrochloric acid, vacuum dehydrate until the solid content reaches 85wt%, drop to normal temperature, measure the viscosity to 3Pa·s, add Fatty alcohol polyoxyethylene ether 6g, isopentane 10g, discharge packing.

[0031] 2) Preparation of composite curing agent:

[0032] Put 10g of phosphoric acid, 200g of hydrochloric acid, and 10g of benzenesulfonic acid into a three-necked flask, stir for 20 minutes, wait until the benzenesulfonic acid is completely dissolved, and then discharge and pack.

[0033] Take 100g modified phenolic resin, 40g composite curing agent, mix and spray the interface.

Embodiment 3

[0035] 1) Preparation of modified phenolic resin:

[0036] Add 80g of phenol, 20g of cardanol, and 200g of formaldehyde (37wt%) into a three-neck flask, stir with sodium hydroxide pH=8-9 and raise the temperature to 85°C. Control the temperature at 85°C to 95°C, react for 2 hours, and then add 60g of urea to react for 1 hour. Adjust the pH to 6.5-7 with hydrochloric acid, vacuum dehydrate until the solid content reaches 85wt%, lower to normal temperature, measure the viscosity to 2.8Pa·s, add 5g of fatty alcohol polyoxyethylene ether and 6g of dichloroethane, discharge and pack.

[0037] 2) Preparation of composite curing agent:

[0038] Put 10g of phosphoric acid, 90g of sulfuric acid, and 5g of oxalic acid into a three-neck flask, stir for 20 minutes, wait until the oxalic acid is completely dissolved, and pack it.

[0039] Take 100g modified phenolic resin, 15g composite curing agent, mix and spray.

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Abstract

The invention discloses a preparation method of modified phenolic resin and an application thereof. The preparation method comprises the following steps of: firstly carrying out polycondensation on phenol, formaldehyde and urea under the conditions of a basic catalyst, the temperature of 85 to 95 DEG C and the pH value of 8 to 9, and regulating the pH value to 6.5 to 7.0 after the reaction is ended; then carrying out vacuum dehydration on polycondensation products under the vacuum condition, enabling the solid content to be 80 to 85 percent by weight, cooling to the room temperature, and regulating the viscosity to be 2.0 to 3.0Pa.s; and finally adding a surfactant and a foaming agent, stirring, discharging and packaging. Furthermore, a composite curing agent is also necessary to be mixed with the modified phenolic resin when in use according to the mass ratio of 100: 10 to 50. The prepared modified phenolic resin has the advantages of light weight, low toxicity, difficult combustion, low smoke, heat insulation, high temperature and low temperature resistance, and the like, can be widely used in the fields of building, transportation, shipping, chemical engineering, petroleum, and the like and has a certain social and economic benefits.

Description

technical field [0001] The invention relates to the production field of modified foamed phenolic resin and curing agent, in particular to the preparation and application of a modified phenolic resin. Background technique [0002] At this stage, the main materials used for external wall insulation are: polyurethane foam, polystyrene foam, phenolic resin foam, etc., of which only polyurethane foam can be used for spraying. Polyurethane foam, polystyrene foam, etc. are easy to burn in case of fire, and produce toxic and harmful gases when burning. When a fire accident occurs, it will cause casualties and huge property losses, thus limiting their wide use. Phenolic resin foam has been widely valued for its advantages of heat resistance, flame retardancy, self-extinguishing, flame penetration resistance, and no dripping in case of fire, but at this stage it can only be made into plates, resulting in higher cost than polystyrene foam , the application is limited, so developers an...

Claims

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Application Information

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IPC IPC(8): C08L61/34C08G14/08C08J9/14
Inventor 顾建华马成夫
Owner 上海虞城新型建材有限公司
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