Diaphragm for miniature sound-generating device, and miniature sound-generating device

A diaphragm for a miniature sound-generating device, comprising a polyacrylate copolymer and a reinforcing agent mixed therein, wherein the polyacrylate copolymer is 100 parts by mass, and the reinforcing agent is selected from the group consisting of a carbon black, a silicon dioxide, a calcium carbonate and barium sulphate, and wherein the reinforcing agent is 1-90 parts by mass,

• wherein the polyacrylate copolymer comprises an ethylene-acrylate-carboxylic acid copolymer, the ethylene-acrylate-carboxylic acid copolymer is a block copolymer, having a molecular formula shown as follows:
• where in the above molecular formula, x, y and z are natural numbers, and R and R′ are alkyl groups,
• a mass ratio of a polyethylene block to a polyacrylate block therein is 5-10,
• a polycarboxylic acid block accounts for 0.5 wt %-10 wt % of total mass of the polyacrylate copolymer,
• the polyacrylate copolymer further comprises a vulcanizing agent mixed therein, wherein the vulcanizing agent is 0.5-5 parts by mass, and the vulcanizing agent comprises diethyldithiocarbamate,
• wherein the polyacrylate copolymer further comprises a plasticizer with 3-7 parts by mass, which comprises at least one of aliphatic dibasic acid esters, phthalic acid esters, benzene polyacid esters, benzoic ethers, polyol esters, chlorinated hydrocarbons, and epoxides,
• wherein a Shore hardness of the diaphragm has a range of 15-20 A, and
• wherein a glass transition temperature of the diaphragm has a range of −60 to −20° C.