Modified phenolic resin adhesive

Abstract

The invention belongs to the field of phenolic resins and in particular relates to a modified phenolic resin adhesive. The modified phenolic resin adhesive is prepared by the method of heating phenol, formaldehyde, alkali and a modifying agent for reaction so as to obtain the modified phenolic resin adhesive, wherein the modifying agent contains multiple ones of cyanamide compound, eleostearate, oxidized starch and tannin. As multiple specific modifying agents are added in the preparation process of the phenolic resin adhesive, the modified phenolic resin adhesive has the advantages that the residue amounts of free phenol and aldehyde in the prepared adhesive can be obviously reduced and the adhesive strength of the adhesive can be obviously improved. The experiment result shows that the content of the free aldehyde in the modified phenolic resin adhesive is lower than 0.3 wt%, the content of the free phenol in the modified phenolic resin adhesive is lower than 4 wt% and the adhesive strength of the modified phenolic resin adhesive is higher than 3 MPa.

Description

technical field

[0001] The invention belongs to the field of phenolic resins, in particular to a modified phenolic resin adhesive. Background technique

[0002] my country is a country with a shortage of forest resources. Forest resources are very precious, and there is a big contradiction between the supply and demand of timber. According to customs statistics, in the first quarter of 2016, my country imported a total of 11 million cubic meters of logs. In the case of a serious shortage of forest resources in my country, after the full implementation of the natural forest resources protection project in China, the timber supply structure has undergone fundamental changes, using fast-growing timber, low-quality timber, small-diameter timber, thinning timber and non-wood plant fibers as raw materials It is the trend of the times to replace traditional large-diameter wood resources with high-quality recombined wood.

[0003] Recombined wood is a kind of artificial wood with h...

Examples

Embodiment 1

[0028] 1) Prepare raw materials:

[0029] name Dosage phenol 30 mole parts formaldehyde 60 mole parts sodium hydroxide 6 mole parts Melamine 15 parts by mole Triglycerides of oleic acid 10 mole parts

[0030] 2) Preparation of modified adhesive

[0031] Add the above 4 kinds of raw materials into the reaction kettle, and control the temperature at 50°C. After reacting for 5 hours, the modified adhesive was obtained.

Embodiment 2

[0033] 1) Prepare raw materials:

[0034]

[0035] 2) Preparation of modified adhesive

[0036] Add the above 4 kinds of raw materials into the reaction kettle, and control the temperature at 50°C. After reacting for 5 hours, the modified adhesive was obtained.

Embodiment 3

[0038] 1) Prepare raw materials:

[0039] name Dosage phenol 30 mole parts formaldehyde 60 mole parts sodium hydroxide 6 mole parts Melamine 15 parts by mole Tannins 10 mole parts

[0040] 2) Preparation of modified adhesive

[0041] Add the above 4 kinds of raw materials into the reaction kettle, and control the temperature at 50°C. After reacting for 5 hours, the modified adhesive was obtained.

technical field

[0001] The invention belongs to the field of phenolic resins, in particular to a modified phenolic resin adhesive. Background technique

[0002] my country is a country with a shortage of forest resources. Forest resources are very precious, and there is a big contradiction between the supply and demand of timber. According to customs statistics, in the first quarter of 2016, my country imported a total of 11 million cubic meters of logs. In the case of a serious shortage of forest resources in my country, after the full implementation of the natural forest resources protection project in China, the timber supply structure has undergone fundamental changes, using fast-growing timber, low-quality timber, small-diameter timber, thinning timber and non-wood plant fibers as raw materials It is the trend of the times to replace traditional large-diameter wood resources with high-quality recombined wood.

[0003] Recombined wood is a kind of artificial wood with h...

Examples

Embodiment 1

[0028] 1) Prepare raw materials:

[0029] name Dosage phenol 30 mole parts formaldehyde 60 mole parts sodium hydroxide 6 mole parts Melamine 15 parts by mole Triglycerides of oleic acid 10 mole parts

[0030] 2) Preparation of modified adhesive

[0031] Add the above 4 kinds of raw materials into the reaction kettle, and control the temperature at 50°C. After reacting for 5 hours, the modified adhesive was obtained.

Embodiment 2

[0033] 1) Prepare raw materials:

[0034]

[0035] 2) Preparation of modified adhesive

[0036] Add the above 4 kinds of raw materials into the reaction kettle, and control the temperature at 50°C. After reacting for 5 hours, the modified adhesive was obtained.

Embodiment 3

[0038] 1) Prepare raw materials:

[0039] name Dosage phenol 30 mole parts formaldehyde 60 mole parts sodium hydroxide 6 mole parts Melamine 15 parts by mole Tannins 10 mole parts

[0040] 2) Preparation of modified adhesive

[0041] Add the above 4 kinds of raw materials into the reaction kettle, and control the temperature at 50°C. After reacting for 5 hours, the modified adhesive was obtained.

Images