The hottest prospect degradable plastics and build

2022-08-23
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Prospect of degradable plastics and building materials packaging materials

Abstract: This paper summarizes the development and current situation of building materials packaging materials, puts forward the possibility of applying degradable plastics to building materials packaging, and looks forward to the development trend

key words: building materials packaging materials green packaging degradable plastics

1. The development process of building materials packaging

China's packaging industry started late, and it was not until the reform and development in the 1980s that the packaging industry was paid attention to. At that time, the packaging of building materials products was still in the initial stage of development. The cement package is packed in paper bags that have been made for decades. The paper is poor and heavily doped with recycled paper, which is easy to damage the cement bag and cause serious cement leakage during handling. Not only caused huge economic losses, but also seriously polluted the environment. The flat glass is also packed in the traditional single lattice wooden box with straw liner inside, which is also easy to cause collision and damage by manual loading and unloading. With the continuous development of the national economy, the output of cement has soared year by year, while the supply of paper is limited. There was once an extreme lack of building materials and packaging materials. Over the years, people have formed the idea of "emphasizing products and neglecting packaging", which has seriously hindered the development of the building materials industry

in response to some of the above problems, the relevant national departments sized up the situation and formulated the guidelines of "letting a hundred flowers bloom and the survival of the fittest", and China's building materials packaging materials began to enter the stage of rapid development. In order to solve the shortage of cement packaging paper, there is a shortage of plastic textile bag packaging paper, plastic woven bag packaging materials and composite packaging materials, which use polyethylene and polypropylene materials to alleviate the supply contradiction. For glass packaging, steel containers were timely adopted and transported in containers, which effectively solved the problem of wood shortage. The state also revised the national standard of cement paper bag with strong bearing capacity and formulated the new national standard of glass container rack, which standardized the manufacturing and production of building materials and packaging materials. The supporting special machinery and equipment were also gradually finalized and began professional production

early plastic woven bags and composite bags have some unreasonable design and insufficient use experience, so there are certain quality problems. After a period of testing and exploration, some composite bags that are difficult to recycle are removed and replaced with laminated woven bags. The paper bag has abolished the three plus one bag type and has been incorporated into the revised national standard for cement bags. Glass containers have gradually developed from A-frame and L-frame to more advanced suit type and guide rail type, and the wooden box packaging of glass has also developed from old lattice wooden box to combined wooden box and new lattice wooden box

nowadays, building materials packaging materials are booming, and have entered a steady stage of development, with various packaging forms. At present, there are three categories of cement packaging bags used in the market; Paper bags, laminated plastic woven bags and various composite bags. Paper bags include four layers of paper bags, three layers of stretch paper and other sub categories, and various composite bags include paper plastic composite bags, prestressed composite bags, water-soluble yarn composite bags and so on. In the glass packaging appliances, the wooden cases include new lattice wooden cases and combined wooden cases; Container racks have a type, L type, closed type, W type, suit type, guide rail type and combined type

2. The development trend of building materials packaging - green packaging

how to protect the environment and promote and maintain the sustainable development of social economy is an urgent problem to be solved in China at present. To meet the needs of environmental protection, only by taking the road of green packaging can China's building materials packaging conform to the trend and develop healthily. The so-called green packaging refers to packaging materials that do not pollute the ecological environment, do not harm human health, and can be recycled and recycled. In fact, the current packaging of building materials products is undoubtedly a major category that should focus on pollution prevention and control. Taking cement packaging as an example, the output of cement in China has reached more than 500 million tons. Excluding bulk cement, bagged cement needs about 8billion bags/year. These bags are disposable, and the total amount of waste reaches 1.6 billion tons per year. Try to imagine that if these wastes cannot be recycled, the degree of environmental pollution can be imagined. Although more than two-thirds of the packaging bags can be recycled. Even so, it is still a considerable number of wastes that may cause the failure of the lifting drive mechanism and cannot be recycled. As for the dust pollution generated in the packaging process of cement, it is still very serious. In view of this situation, in the national standard of cement packaging bags, which will be revised again, we should resolutely discard those packaging bag types that cannot recycle waste and promote green packaging

at present, the green packaging of building materials has made great progress in technology and equipment, and scientific planning and layout have been made in accordance with the principles of convergence, circulation, chain formation and sustainability. For example, from the traditional multi-layer paper bag to the stretchy low paste bottom bag, it has achieved the reduction of packaging and saved forest resources. Many enterprises have launched mature products. Another example is the vinylon water soluble yarn composite packaging bag developed by Gansu Lanzhou Jin'an New Technology Co., Ltd., which uses the characteristics of vinylon fiber that can dissolve in hot water at a certain temperature before acetalization, so that the waste bag paper can be used as the main raw material, and uses the chemical action of the hydrogen bond affinity of the pulp fiber itself, without any binder, so that the upper and lower layers of pulp are combined with the reinforcement on the paper machine, which has good bursting resistance, permeability, heat resistance Moisture resistance and easy filling, and low cost, no pulping in the production process, no acid and alkali waste liquid discharge

green packaging has just started. With the continuous development of environmental protection technology, it is believed that more environmental friendly packaging materials will come out

3. Degradable plastics are used in building materials packaging

degradable plastics are a new kind of environmental protection materials. Before or during use, they have the same or similar application performance and sanitary performance with similar ordinary plastics. After completing their use function, they can quickly degrade into fragments or debris that are easy to be absorbed by the environment under natural environmental conditions, And with the passage of time, it further degraded into completely harmless substances to the environment, and finally returned to nature

it has the following characteristics:

(1) usability: it has the application performance equivalent to or similar to that of similar ordinary plastics:

(2) degradability: after completing the use function, it can degrade rapidly under natural environmental conditions, become fragments or debris that are easy to be absorbed by the environment, and finally return to nature

(3) safety: the substances produced in the degradation process and the residues after degradation are harmless to the natural environment or have no potential harm

(4) economy: the price is equal to or slightly higher than that of similar ordinary plastics

degradable plastics, as high-tech products and environmental protection products, are becoming a research and development hotspot attracting worldwide attention. Its development not only expands the functions of plastics, but also alleviates environmental contradictions to a certain extent. It is a supplement to the increasingly exhausted oil resources, and shows the advantages and bright prospects of biotechnology and alloy technology in the field of plastic materials from the perspective of synthetic technology. Therefore, the research, development, promotion and application of degradable plastics, whether from the practical point of view of environmental protection of the earth or from the inexhaustible renewable resources, It is also of great significance from the academic point of view of the synthesis of functional polymers

therefore, degradable materials have developed rapidly due to their broad application prospects, and have been gradually applied to various sectors of industry and agriculture

in building materials packaging materials, the use of plastic woven bags is a great innovation in China. With its advantages of good strength and low price, it has quickly occupied 2/3 of the cement packaging industry market, and there is a trend to continue to expand. However, with the increasing use of plastic in building materials packaging, the problem of environmental pollution has become increasingly obvious. The monofilament thickness of plastic woven bags is about 0.02mm, which is equivalent to ultra-thin material bags. Although plastic can be recycled, the actual situation of the building materials industry determines that the recycling of waste plastic woven bags is not a technical problem, but an economic problem, so this problem is more difficult to solve. In China, about 160000 tons of plastic woven cement bags are discarded in nature every year, causing great harm to the environment. If degradable plastics are used in building materials packaging instead of general plastics, it will integrate the light weight, high strength and degradability of ordinary plastics, which will not only meet the needs of actual production, but also greatly reduce the pollution to the environment after being used and discarded. The application of degradable plastics in building materials packaging has the following advantages:

(1) degradable plastic woven bags use renewable resources or widely existing mineral resources on earth, reduce the use of petrochemical resources, and realize resource reduction

(2) the production process of degradable plastics has become mature, and the production equipment is simple, which can be produced in large quantities. When it is used in the production of woven bags, its production process does not need to be greatly changed, so compared with other green packaging materials, it has greater competitive advantages and feasibility

(3) degradable plastic woven bags used in building materials packaging conform to the development trend of green packaging. It fully conforms to the recently revised national standards for building materials packaging industry, and is an environmental friendly packaging material

(4) degradable plastics can also be used for laminating materials and lining bag materials. This can avoid the problem that Chinese herbal medicine paper and plastic are not easy to separate during the construction process, and simplify the construction operation

therefore, the application of degradable plastics in the building materials packaging industry has a good application prospect, and many enterprises and research departments have begun relevant research. It can be predicted that degradable plastics will be of great use in the building materials packaging industry in a short time

4. Outlook

combined with the characteristics of degradable plastics and building materials packaging materials, degradable plastics need to solve the following problems:

(1) controllability of degradation time: the newly implemented national standard for cement strictly stipulates the use time of cement. Therefore, degradable plastics, whether in formula design and production, should be studied under various application conditions to meet the actual needs of cement and other products

(2) use performance: degradable plastics are used in the production of plastic woven bags. The contradiction between moisture resistance and permeability needs to be solved, otherwise it will cause dust pollution and inaccurate measurement, causing a series of problems

(3) degradable plastics should ensure certain strength and toughness to avoid damage during filling and handling

(4) degradable plastics need to be further studied in terms of carrier resin selection, degradation mode and production equipment

5. Conclusion

(1) green packaging is the development trend of building materials packaging materials

(2) degradable plastics have good competitive advantages and feasibility in building materials packaging

References:

⑴ degradable plastic communication Degradable Plastics Research Association of China Plastics Engineering Society 2000 (1)

⑵ where is the road? Talk about cement packaging Xu Sheng Building materials packaging 1999 (4)

⑶ Tang saizhen Recent development trends, problems and prospects of degradable plastics, modern plastic processing and application 1994 (1): the higher the reliability of structural parts 5 ~ 11

(4) Johnson et aesthetics, city of the plastics industry, Washington, D.C., 1987,22

(5) review and Prospect of building materials packaging reform Building materials branch of China Packaging Technology Association 2001.5

⑹ vances in Polymer Technolo-gy. 1990,10

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