Heat storage composition, heat storage member, electronic device, and manufacturing method of heat storage member

A heat storage composition comprising:

• a heat storage material;
• and
• a flame retardant,
• wherein Condition A is satisfied,
• Condition A:
• a gas generation temperature Tr of the flame retardant obtained by Measuring Method A1 is lower than a gas generation temperature Ta of a specific composition obtained by Measuring Method A2,
• Measuring Method A1:
• a type and a content of the flame retardant contained in the heat storage composition are identified, a weight change of the flame retardant due to heating is measured by using a thermogravimeter-differential thermal analyzer, and a relational expression, which is represented by Expression (A1), between a temperature T (° C.) and a weight reduction ratio Δma(T) of the flame retardant is derived based on a measurement result,
• Δma(T)=(ma0−ma(T))/(ma0) (A1)
• in Expression (A1), ma(T) represents a weight of the flame retardant at the temperature T (° C.) and ma0 represents a weight of the flame retardant before heating, a temperature at which the weight reduction ratio Δma(T) of the flame retardant reaches 2% by mass is obtained by using Expression (A1), and the obtained temperature is defined as the gas generation temperature Tr (° C.) of the flame retardant,
• Measuring Method A2:
• a weight change of the heat storage composition due to heating is measured by using the thermogravimeter-differential thermal analyzer, and a relational expression, which is represented by Expression (A2), between the temperature T (° C.) and a weight reduction ratio Δm1(T) of the heat storage composition is derived based on a measurement result,
• Δm1(T)=(m10−m1(T))/(m10) (A2)
• in Expression (A2), m1(T) represents a weight of the heat storage composition at the temperature T (° C.) and m10 represents a weight of the heat storage composition before heating,
• further, a type and a content of a solvent, which is contained in the heat storage composition and has a boiling point of 100° C. or lower, are identified;
• as a result of measurement, in a case in which the heat storage composition contains the solvent, a weight change of the solvent due to heating is measured by using the thermogravimeter-differential thermal analyzer, and a relational expression, which is represented by Expression (A3), between the temperature T (° C.) and a weight reduction ratio Δmb(T) of the solvent is derived based on a measurement result,
• Δmb(T)=(mb0−mb(T))/(mb0) (A3)
• in Expression (A3), mb(T) represents a weight of the solvent at the temperature T (° C.) and mb0 represents a weight of the solvent before heating,
• a relational expression, which is represented by Expression (A4), between the temperature T (° C.) and a weight reduction ratio Δmx(T) of the specific composition obtained by removing the flame retardant and the solvent from the heat storage composition is derived,
• Δmx(T)=(100*Δm1(T)−a*Δma(T)−b*Δmb(T))/(100−a−b) (A4)
• in Expression (A4), a represents a ratio (% by mass) of the content of the flame retardant to a total mass of the heat storage composition, b represents a ratio (% by mass) of the content of the solvent to the total mass of the heat storage composition, and Δma(T) represents the weight reduction ratio of the flame retardant obtained by Measuring Method A1, a temperature at which the weight reduction ratio Δmx(T) of the specific composition reaches 2% by mass is obtained by using Expression (A4), and the obtained temperature is defined as the gas generation temperature Ta (° C.) of the specific composition.