Phenol-formaldehyde-resin-modified rigid polyurethane foam and preparation method thereof

Abstract

The invention relates to phenol-formaldehyde-resin-modified rigid polyurethane foam and a preparation method thereof. The phenol-formaldehyde-resin-modified rigid polyurethane foam is prepared by the following steps: (1) synthesizing phenol formaldehyde resin, namely, stirring phenol and formaldehyde solution in a reactor, heating while adding an alkaline catalyst, performing the reaction at the reaction temperature of 80 to 95 DEG C, cooling a reaction solution after the reaction is ended, adjusting the pH value of the system to 6 to 7 by adding an acid solution, and dehydrating to obtain the phenol formaldehyde resin; (2) preparing a rigid polyurethane foam material which comprises the following substances: (A) isocyanate; (B) the phenol formaldehyde resin; (c) polyhydric alcohols; (D) a foam stabilizer; (E) a catalyst; (F) a flame retardant; (G) a foaming agent. The phenol formaldehyde resin is introduced into the polyurethane foam, and a flame retardant structure is generated by virtue of chemical reaction of the phenol formaldehyde resin and isocyanate. Compared with the conventional polyurethane foam, the foam provided by the invention has the advantages that the flame resistance is obviously improved, the smoke density is reduced, and the stability is relatively good.

Description

technical field

[0001] The invention relates to a preparation method of a high-ortho-phenylene ether type phenolic resin, a method of using the phenolic resin to prepare a rigid polyurethane foam and a product thereof, in particular to a phenolic resin modified rigid polyurethane foam and a preparation method thereof. Background technique

[0002] Rigid polyurethane foam is usually produced by rapidly stirring and mixing polyol and isocyanate in the presence of catalyst, surfactant, foaming agent and other auxiliary agents as needed to make it foam. Due to its light weight and good heat insulation and water resistance, rigid polyurethane foam is widely used as heat insulation material in urban heating pipelines, petrochemical pipelines, refrigeration equipment, air-conditioned buses, etc. In recent years, with the in-depth development of energy-saving materials in the construction industry in my country, the excellent performance of rigid polyurethane foam has been favored b...

Examples

Embodiment 1

[0087] Add 100g of phenol and 109g of 50% by weight formaldehyde solution into the reactor in sequence, then add 1g of triethylamine, slowly raise the temperature to 80°C, react for 120min, add cooling reaction solution, and add acid to adjust the pH value of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1500mPa·s / 25°C, the water content is 3%, and the hydroxyl value is 280mgKOH / g.

Embodiment 2

[0089] Add 100g of phenol and 96g of 50% by weight formaldehyde solution into the reactor in sequence, then add 1.5g of triethylamine, slowly raise the temperature to 85°C, react for 120min, add cooling reaction solution, and add acid to adjust the pH value of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1800mPa·s / 25℃, the water content is 2%, and the hydroxyl value is 260mgKOH / g.

Embodiment 3-8

[0091] The flame retardant polyurethane composition of the present invention is formed by the components shown in the following table and the weight ratio shown in the following table. Table 1

[0092]

[0093] Table 2

[0094]

technical field

[0001] The invention relates to a preparation method of a high-ortho-phenylene ether type phenolic resin, a method of using the phenolic resin to prepare a rigid polyurethane foam and a product thereof, in particular to a phenolic resin modified rigid polyurethane foam and a preparation method thereof. Background technique

[0002] Rigid polyurethane foam is usually produced by rapidly stirring and mixing polyol and isocyanate in the presence of catalyst, surfactant, foaming agent and other auxiliary agents as needed to make it foam. Due to its light weight and good heat insulation and water resistance, rigid polyurethane foam is widely used as heat insulation material in urban heating pipelines, petrochemical pipelines, refrigeration equipment, air-conditioned buses, etc. In recent years, with the in-depth development of energy-saving materials in the construction industry in my country, the excellent performance of rigid polyurethane foam has been favored b...

Examples

Embodiment 1

[0087] Add 100g of phenol and 109g of 50% by weight formaldehyde solution into the reactor in sequence, then add 1g of triethylamine, slowly raise the temperature to 80°C, react for 120min, add cooling reaction solution, and add acid to adjust the pH value of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1500mPa·s / 25°C, the water content is 3%, and the hydroxyl value is 280mgKOH / g.

Embodiment 2

[0089] Add 100g of phenol and 96g of 50% by weight formaldehyde solution into the reactor in sequence, then add 1.5g of triethylamine, slowly raise the temperature to 85°C, react for 120min, add cooling reaction solution, and add acid to adjust the pH value of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1800mPa·s / 25℃, the water content is 2%, and the hydroxyl value is 260mgKOH / g.

Embodiment 3-8

[0091] The flame retardant polyurethane composition of the present invention is formed by the components shown in the following table and the weight ratio shown in the following table. Table 1

[0092]

[0093] Table 2

[0094]

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