Development of Waste Styrofoam Modified Emulsion Adhesive

[Abstract] A kind of wood paper adhesive with excellent performance was prepared by washing, drying, crushing, dissolving, modifying and emulsifying waste polystyrene foam. The optimization tests were conducted on the selection of raw materials, the selection and formulation of low-toxicity mixtures, the choice of modifiers, the selection of emulsifiers, the choice of reaction temperature and reaction time. Ethyl acetate, toluene, acetone as the solvent for the best ratio: m (ethyl acetate) m (toluene). m (acetone) = 3:2:0.5. Maleic anhydride and acrylic acid were used to modify the waste polystyrene. The effects of phenolic resin modification and phthalic acid dibutyl formate plasticization on its adhesive properties were discussed to determine the optimum amount of phenolic resin is 3.0% to 4.0%, dibutyl phthalate The amount of ester is 8% -10%. The waste polystyrene was emulsified and modified with anionic surfactant sodium lauryl sulfate and nonionic surfactant 0P-10 as emulsifiers. Modification temperature is (80±2)°C, reaction time is 3～4h, emulsification temperature is 70°C, reaction time is 1-2ho

Keywords: adhesives; waste polystyrene; maleic anhydride; acrylic acid; dibutyl phthalate

Discarded polystyrene foam, because it is difficult to decompose naturally in the environment, thus causing severe white pollution to the environment, has become a major public hazard. Since the 1970s, Japan and Western Europe have successively processed waste polystyrene foam industrially, but only for the purpose of clearing industrial pollution and protecting the environment, many methods such as deep burial and incineration have been used, wasting resources and generating large amounts of smoke. , causing air pollution. In recent years, there have been research reports on the recycling of waste polystyrene foam at home and abroad, such as pyrolysis recovery of gasoline or pyrolysis recovery of ethylene monomer, but such equipment has a large investment, resulting in poor product performance and poor economic efficiency. Some adhesives are recovered and prepared. However, adhesives directly prepared from waste polystyrene foam have the disadvantages of hard and brittle adhesive layers, unstable strength, large solvent toxicity, and high cost. The main methods for the treatment and recycling of waste polystyrene foam are: 1) incineration and utilization of combustion heat; (2) landfill; (3) closed thermal cracking recovery of styrene monomer series; (4)) competition and smashing After granulation as recycled plastics; (5) Preparation of modified polystyrene series coatings and adhesives; (6) Production of low-grade plastic products; (7) Preparation of lightweight building materials, packaging materials. The development of adhesives for packaging materials using solid waste is also a current hotspot.

Polystyrene foam is a kind of rigid non-polar high-molecular substance. If it is made directly into a solvent-based adhesive, the adhesive layer is hard and brittle, the strength is not high, and the toxicity of the solvent is large and the cost is high. Waste polystyrene foam as the main raw material, polyvinyl alcohol as a tackifier, maleic anhydride, acrylic acid, benzoyl peroxide and phenolic resin as modifier, anionic surfactant lauryl sulfate Sodium and non-ionic surfactant OP-10 are emulsifiers to produce excellent emulsion adhesives. The method has the advantages of low energy consumption, simple process, low investment and quick effect, etc. The product has the characteristics of high bonding strength, fast drying, and strong film formation. It can not only solve the problem of white pollution, but also can meet the requirements of the market for cheap adhesives. The market demand for adhesives as packaging materials is large.

1 Experimental section

1.1 Raw materials and drugs

Acetone, phenol, formaldehyde, maleic anhydride, dibutyl phthalate, acrylic acid, benzoyl peroxide are analytically pure; sodium lauryl sulfate, OP-10 emulsifier, and zinc oxide are chemically pure; 801 glue, ethyl acetate, toluene are industrial grade.

1.2 Modification principle

1.2.1 Maleic anhydride, acrylic modification

Polystyrene is a non-polar substance, its molecular structure contains benzene ring reduces the flexibility of the molecular chain, to make polystyrene become adhesive, must add modifiers to modify, in order to improve the adhesion, while adding Plasticizers improve its brittleness. The use of maleic anhydride for graft modification of polystyrene, on the one hand, increases the polarity of the polystyrene and improves the affinity of the adhesive with the material. On the other hand, maleic anhydride and polystyrene undergo a small amount of cross-linking reaction, improving the toughness of the adhesive. Chuan page anhydride and styrene copolymerization is good, and the price is cheap, after the hydrolysis to obtain carboxyl groups, the polarity is enhanced, the modified polystyrene bonding strength increases.

The unsaturated double bond end groups in polystyrene can be graft copolymerized with acrylic acid and maleic anhydride under the action of initiator benzoyl peroxide (BPO). The reaction is as follows:

1.2.2 Emulsification Modification

Emulsions are liquid-liquid dispersions in which one (or several) liquids are dispersed in the form of droplets in another liquid that is immiscible with them. The average size and distribution of droplets are important properties of the emulsion. The smaller the droplets, the more uniform the distribution and the more stable the emulsion. Use complex emulsifiers to reduce the oil-water interfacial tension and achieve good emulsification results through high-speed stirring. By emulsification modification, the amount of solvent can be reduced, and at the same time, the harm of the volatilization of the solvent in the sizing process to the human body can be avoided, so as to achieve the effect of environmental protection.

1.3 Experimental Procedure

Ethyl acetate, toluene, acetone solvent and the plasticizer dibutyl phthalate were added into a three-necked bottle equipped with a stirring and condensing device, and the washed, crushed, used waste polystyrene foam was fully dissolved. Then, maleic anhydride and benzoyl peroxide were added and the reaction was carried out at a constant temperature of (80±2)°C for 3 to 4 hours. The order was to about 70°C. Add phenolic resin constant temperature reaction 0.5 ~ 1H. Then 801 gum, filler, water and emulsifier were added and the mixture was emulsified at (70±2)° C. and emulsified under high-speed stirring for 1.2 h. The solvent was removed while emulsifying, and a milky white emulsion adhesive was obtained. (to be continued)

Development of Waste Styrofoam Modified Emulsion Adhesive II

Development of Waste Styrofoam Modified Emulsion Adhesive III


A About Waste Polystyrene Modified Adhesive Highlights

Space 1

Development of Waste Styrene Foam Plastic Recycled Adhesive

Development of Used Styrofoam Recycled Adhesive II

Development of Waste Styrofoam Recycled Adhesive III

Development of Used Styrofoam Recycled Adhesive IV

Development of Waste Polystyrene Foam Recycled Adhesive

Development of Waste Polystyrene Foam Recycled Adhesive VI

Development of Waste Polystyrene Foam Recycled Adhesive

Space 2

Development of Used Polystyrene Modified Adhesive

Development of Used Polystyrene Modified Adhesive II

Development of Waste Polystyrene Modified Adhesive III


B About Modified Starch Adhesive Highlights

Space 1


Acrylic copolymer modified corn starch adhesive

Acrylic copolymer modified corn starch adhesive II

Space 2

Starch Oxidation Modified Adhesive (top)

Starch Oxidation Modified Adhesive (in)

Starch Oxidation Modified Adhesives (below)

C About Modified Epoxy Adhesives

Development of Polyurethane Modified Epoxy Resin Adhesive

Development of Polyurethane Modified Epoxy Resin Adhesive II

Development of Polyurethane Modified Epoxy Resin Adhesive III

Development of Polyurethane Modified Epoxy Adhesive

D About Modified Bone Adhesives

Experimental Analysis of Adhesive Strength of Modified Bone Glue Experimental Analysis of Adhesive Strength of Modified Bone Glue and Experimental Analysis of Adhesive Strength of Modified Bone Glue