Sizing compositions for glass fiber direct roving for producing multiaxial fabrics, and preparation methods and applications thereof

A method of preparing a sizing composition, comprising the following steps:

• 1) pre-dispersing a first silane coupling agent and a second silane coupling agent in the process as described below:
• adding deionized water and some pH regulator into a first vessel, and adding, under stirring, the first silane coupling agent into the first vessel;
• and
• adding deionized water and more of the pH regulator into a second vessel, and adding, under stirring, the second silane coupling agent and deionized water with a mass of 15-30 times a mass of the second silane coupling agent;
• 2) pre-dissolving a first lubricant and a second lubricant in the process as described below:
• sequentially adding deionized water and the first lubricant into a third vessel, and stirring deionized water and the first lubricant till the first lubricant is fully dissolved;
• and
• adding deionized water and the second lubricant into a fourth vessel, and stirring deionized water and the second lubricant till the second lubricant is fully dissolved;
• 3) pre-dissolving and diluting a first film former and a second film former in the process as described below:
• adding the first film former and deionized water into a fifth vessel, and stirring the first film former and deionized water till the first film former is dissolved;
• and
• adding the second film former and deionized water into a sixth vessel, and stirring the second film former and deionized water till the second film former is dissolved;
• 4) adding into a preparation vessel successively the following:
• a) water accounting for 10%-30% of a total mass of the sizing composition to be prepared;
• b) a pre-dispersed first silane coupling agent and a pre-dispersed second silane coupling agent obtained in step 1);
• c) a pre-dissolved and diluted first film former and a pre-dissolved and diluted second film former obtained in step 3);
• d) a pre-dissolved first lubricant and a pre-dissolved second lubricant obtained in step 2);
• and
• e) a remainder of deionized water;
• and
• stirring and uniformly mixing to obtain the sizing composition for glass fiber direct roving for producing multiaxial fabrics;
• wherein a solids mass of the sizing composition accounts for 10-15% of the total mass of the sizing composition, and the remainder of the sizing composition is the deionized water;
• each component accounting for a total solids mass of the sizing composition expressed in percentage by mass as follows:
• the first silane coupling agent
• 0.1-5.0%;
• the second silane coupling agent
• 2.5-11.0%;
• the first film former
• 3.0-20.0%;
• the second film former
• 45.0-75.0%;
• a plasticizer
• 0-5.0%;
• the first lubricant
• 0.2-4.0%;
• the second lubricant
• 5.0-20.0%;
• and
• the pH regulator
• 0.01-3.0%;
• wherein the first film former is at least one of a triglycidyl p-aminophenol trifunctional epoxy emulsion, an epoxidized m-xylylenediamine tetrafunctional epoxy resin emulsion, a dicyclopentadiene phenol glycidyl ester resin, or a 1,3-bis (N, N-diglycidyl aminomethyl) cyclohexane tetrafunctional epoxy resin emulsion;
• and the second film former is a liquid epoxy emulsion;
• and a solids mass of the sizing composition accounts for 10-15% of a total mass of the sizing composition, and a remainder of the sizing composition is deionized water;
• wherein the first lubricant is one or more of a fatty acid amine and an epoxy modified phenylsiloxane;
• and the second lubricant is a polyethylene glycol (PEG) lubricant;
• wherein the first silane coupling agent is one or more of a γ-aminopropyl triethoxy silane, a γ-aminopropyl trimethoxy silane, an N-β-(aminoethyl)-γ-aminopropyl trimethoxy silane, a γ-glycidyl etherpropyl trimethoxy silane, a 3-glycidyl propyl methoxydiethyloxy silane, and a γ-methacryloyloxypropyl trimethoxy silane;
• and the second silane coupling agent is one or more of an N-phenyl-N-aminoethyl-γ-aminopropyl trioxysilane hydrochloride, a cationic styrene aminotrimethoxy silane, and a polynitrogen amide silane.