Phenolic glue and preparation method thereof
A phenolic glue, phenol technology, used in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve problems such as damage to liver and kidney function, damage to respiratory tract, eye irritation, etc.
Pending Publication Date: 2022-07-15
HENAN AGRICULTURAL UNIVERSITY
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Problems solved by technology
Both phenol and formaldehyde have certain toxicity and will endanger human health: phenol has a strong corrosive effect on skin and mucous membranes, and can also damage liver and kidney functions; formaldehyde is a potential 2-A carcinogen that can stimulate Damage to the eyes and respiratory tract leading to organ cancer
Method used
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preparation example Construction
[0038] The preparation method of phenolic lignin is the same as that of phenolic nano-lignin, the difference is that there is no step S2.
[0039] The preparation method of nano-lignin is the same as that of phenolic nano-lignin, the difference is that there is no step S1.
Embodiment 1
[0041] Embodiment 1 provides a kind of phenolic glue, and the component content is shown in Table 1, and the preparation method is as follows:
[0042] S3, mix the phenolic nano-lignin, phenol, 2 / 3 formaldehyde and 2 / 3 sodium hydroxide, heat up to 85°C, and react for 10min;
[0043] S4. The remaining 1 / 3 formaldehyde and the remaining 1 / 3 sodium hydroxide are added to step S3, urea is added, and the reaction is continued at 85° C. for 1 h to obtain phenolic glue.
Embodiment 2～3
[0045] Examples 2-3 provide a series of phenolic adhesives, the component contents are shown in Table 1, and the preparation method is the same as that in Example 1.
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Abstract
The invention discloses phenolic glue and a preparation method thereof. The phenolic glue comprises the following preparation raw materials in parts by weight: 30-300 parts of phenolated nano lignin; 10 to 20 parts of phenol; 60 to 600 parts of formaldehyde; 6-36 parts of an alkaline substance; and 5-10 parts of an absorbent. The phenolic glue is prepared from phenolated nano lignin as a raw material, phenol and formaldehyde, the phenolic glue has higher bonding strength and lower formaldehyde emission, on one hand, the reaction activity of phenol and nano modified lignin is improved, phenolic hydroxyl groups of lignin are increased, and sites capable of reacting with formaldehyde are increased; the surface area and the pore structure of the nano-modified lignin are increased, so that the contact between the nano lignin and formaldehyde is increased, and the bonding strength is remarkably improved; and on the other hand, the lignin modified by phenol and nanocrystallization has many reaction sites, large specific surface area and increased pore structures, so that the formaldehyde emission of the prepared phenolic glue is remarkably reduced.
Description
technical field [0001] The invention relates to the technical field of adhesives, in particular to a phenolic adhesive and a preparation method thereof. Background technique [0002] Using phenolic and aldehyde compounds as raw materials, a large class of resins obtained by polycondensation are collectively referred to as phenolic resins. Phenolic resins have high polarity and strong cohesion. High rigidity and excellent heat resistance, so it has been widely used in defense, industry, construction, transportation and other fields. [0003] However, the main raw materials of phenolic resin adhesives, phenol and formaldehyde, are extracted from petroleum products, which are not only expensive, but also non-renewable. At the same time, phenolic resin as a wood adhesive will release free phenol and formaldehyde during the production and use of artificial boards [5]. Both phenol and formaldehyde have certain toxicity and will endanger human health: phenol has a strong corrosiv...
Claims
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IPC IPC(8): C09J161/14C08G8/34
CPCC09J161/14C08G8/34
Inventor 李依阳李官燕余晴栗梦真陈香萌彭万喜
Owner HENAN AGRICULTURAL UNIVERSITY