US 12,134,735 B1
Low-shrinkage and high-strength plant-based resinous blocking agent and preparation method thereof
Yongming Li, Chengdu (CN); Yadong Chen, Chengdu (CN); Jiandu Ye, Chengdu (CN); and Dingyuan Zhang, Chengdu (CN)
Assigned to SOUTHWEST PETROLEUM UNIVERSITY, Chengdu (CN)
Filed by Southwest Petroleum University, Chengdu (CN)
Filed on Dec. 12, 2023, as Appl. No. 18/537,488.
Claims priority of application No. 202310720880.9 (CN), filed on Jun. 19, 2023.
Int. Cl. C09K 8/82 (2006.01)
CPC C09K 8/82 (2013.01) 6 Claims
 
1. A low-shrinkage and high-strength plant-based resinous blocking agent consisting of the following substances according to weight parts:
37.2-47.8 parts of epoxy plant oil;
19.8-37.2 parts of benzoxazine;
22.9-31.6 parts of curing agents;
0.8-1.8 parts of initiators;
1.2-1.8 parts of toughening agents; and
0.5-1.2 parts of reinforcing agents,
wherein the sum of the weight parts of the above substances is 100 parts, said epoxy plant oil is obtained through epoxidation on unsaturated carbon-carbon double bonds in a molecule of dehydrated plant oil,
wherein said curing agent is cis-butenedioic anhydride, and said benzoxazine is synthesized from long-chain diamine, monohydric plant phenol and paraformaldehyde,
wherein said benzoxazine is obtained through the following steps:
according to a molar ratio of said long-chain diamine to said monohydric plant phenol to said paraformaldehyde as 1:2:4, weighing a corresponding mass of said long-chain diamine, said monohydric plant phenol and said paraformaldehyde, then weighing toluene as an organic solvent, which is equivalent to a total mass of said long-chain diamine, said monohydric plant phenol and said paraformaldehyde; and
enabling them to react at 90-110° C. for 6-8 h while stirring, subsequently washing the product by alkali, filtering and drying the product to obtain plant-based solid benzoxazine, which is then dissolved in a diluent to obtain said liquid benzoxazine.