Development of the hottest waste polystyrene modif

2022-09-23
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Development of waste polystyrene modified adhesive

[Abstract] taking waste polystyrene (PS) foam as the main raw material, butyl acrylate (BA) and methyl methacrylate (MAA) monomers as modifiers, polystyrene is grafted and modified. Before measurement, a standard block is needed to calibrate the hardness tester and emulsify to make a new modified water emulsion adhesive. The effects of modifier, cross-linking agent, filler and reaction time on the properties of the adhesive were emphatically discussed, and the best formula was obtained. The solid content of PS adhesive prepared is greater than 40%, the rotational viscosity is greater than 3.4pa · s, the room temperature shear strength is greater than 3.5 MPa, and the limit of harmful substances such as the total amount of free aldehyde, toluene and xylene is lower than the standard requirements. This adhesive can be used for bonding wood, paper, aluminum and ceramic tiles

key words: Waste Polystyrene; Butyl acrylate; Modified adhesive

polystyrene foam (PSF) is a new material in the development of modern plastic industry, which is widely used in packaging, heat preservation, waterproof, heat insulation, shock absorption, decoration, catering and other fields ". However, almost all PSF materials are disposable and cause "white pollution" due to their difficulty in natural degradation after use. So how to be reasonable The effective recycling of waste polystyrene foams has attracted widespread attention of scientific researchers all over the world. " ". in this paper, the chemical grafting modification of polystyrene with butyl acrylate and functional monomers is explored to improve the shortcomings of polystyrene, such as high molecular chain rigidity, hard quality and brittleness, and poor flexibility and adhesion of the adhesive layer after direct bonding. A low-cost and good performance water emulsion is developed, which is expected to replace the polyvinyl acetate white emulsion for the bonding of wood plate, paper, daily necessities, ceramic tiles and other materials.

1 experimental method

1 .1 main raw materials and instruments

waste PS foam is the main raw material, the mixture of M (toluene):m (ethyl acetate):m (acetone):m (chloroform):19:20.8:4:1 is the solvent, butyl acrylate (BA) and functional monomer methyl methacrylate (MAA) are therefore modifiers, benzoyl peroxide (BPO) is the initiator, toluene diisocyanate is the crosslinking agent, talc powder is the filler, and all the reagents used are analytical pure. The main instruments of the experiment include hot constant temperature water bath, NDJ-1 rotary viscometer, lj500 tensile test, etc. (taking aluminum sheet and plywood as test pieces)

1.2 preparation method of PS modified adhesive

put 15g of waste PSF cleaned, dried and crushed into a three port flask with a condensing and stirring device, and add an appropriate amount of mixed solvent to dissolve it; Measure the plasticizer dibutyl phthalate (DBP) and its monomer and initiator benzoyl peroxide (BPO), pour it into the beaker with PS dissolved, start stirring, and let it mix evenly to get the organic phase; Weigh the compound emulsifier (sodium dodecyl sulfonate +op-10) and dissolve it in water, and then weigh the activator Cu 2C12 in it to prepare the inorganic phase; Slowly add the organic phase into the inorganic phase, adjust the rotating speed of the agitator, and make it emulsified at a certain temperature; After emulsification, add modifier Ba and active monomer MAA. When it rises to the reaction temperature, the grafting reaction begins. After the reaction reaches the specified time, add filler talc powder, continue to stir to a certain reaction time, and finally cool down to obtain the emulsified product. The preparation process diagram is shown in Figure 1

2 experimental results and discussion

2, 1 main properties of PS modified adhesive

according to the national standard measurement method, the properties of the PS modified adhesive developed in this paper are compared with those of the cast structure white latex sometimes used in a city. The experimental results are shown in Table 2.1. It can be seen from the table that not only the appearance and fluidity (viscosity) of the PS modified adhesive are better than those of the commercial white emulsion, but also its solid content is higher, its bonding performance (shear strength) is better, and the content of organic volatile substances and harmful substances are smaller. This shows that the modified PS adhesive developed has excellent quality and performance

(to be continued)

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