The invention discloses master batch of a high-
transmittance and high-masking
diffusion plate, a method for manufacturing the master batch and a method for manufacturing the
diffusion plate. The master batch comprises, by weight, 100 parts of
polystyrene, 10-11 parts of organic
silicon resin, 0.3-0.4 part of
titanium dioxide
powder with the particle size of 2-5 micrometers, 0.15-0.2 part of fluorescent brighteners and 0.02-0.025 part of
mineral oil. The
polystyrene, the organic
silicon resin, the
titanium dioxide
powder, the fluorescent brighteners and the
mineral oil are blended with one another and then are squeezed to obtain the master batch, 6.1 parts of the master batch and 100 parts of
polystyrene are blended with one another and then are squeezed to obtain mixtures, and the mixtures are further impressed and shaped to obtain the high-
transmittance and high-masking
diffusion plate. The master batch and the methods have the advantages that the purpose of plastically modifying the master batch mainly can be achieved by diffusion particles by the aid of auxiliary chemical raw materials for color increasing and
toughening, accordingly, the diffusion plate has a
diffusion function, high-masking effects further can be realized, the
transmittance of the diffusion plate can reach 65+ / -3%, the
haze of the diffusion plate can reach 99%, and the diffusion of the diffusion plate can reach 88+ / -5%; the cost of modules further can be reduced while requirements on light weights and thinness of the backlight modules are met.