Theory and practice of multicomponent composite bl

Theory and practice of multi-component composite blending modification of plastics (Part 2)

III. application of multi-component composite blending modification theory in Digitization:

for many years, scientists in various countries have been trying to apply computer technology to their own scientific experiments and production practices, but the development of new varieties of modified plastics is an applied science, that is, we must first carry out exploratory formula, and then make samples through field trials Then the scientific data are obtained through standard testing, and then the reasonable formula is obtained through screening, which is trial produced into finished products and further improved to produce new and reasonable scientific theories to guide practice. As a Chinese plastic science and technology expert, I have always dreamed of using computer technology to simulate plastic modification experiments to improve work efficiency and complete the project more quickly and economically. At the same time, if there is an advanced theory to guide the promotion of analog plastic modified digital technology, it will benefit the majority of small and medium-sized plastic enterprises, and will no longer be unable to implement modified plastics due to lack of technical force, thus saving time, labor and money. However, the digitization of plastic modification technology has been stranded because of the lack of suitable theoretical and mathematical models and digital tools. The emergence of the multi-component composite blending modification theory has found a way for us to combine the plastic blending modification technology with computer application. It makes it possible for the latest theory of plastic blending modification to transform into advanced production technology and guide scientific experiments and production practice. Ordinary companies have adopted remote monitoring, diagnosis and console; Its application can make a certain performance of modified plastics excellent, while other performance and technical indicators do not decline, and the original processing technology and processing equipment do not need to be changed

the most important thing here is to establish a mathematical model of multivariate composite blending modification theory, so as to organically combine plastic modification technology with general plastic or engineering plastic formulation technology by computer simulation. Its representative formulas are duo=1+2+3+... +n and fu=a+b+c+... +n, duo and Fu mean multivariate composite blending, and l, 2, 3,..., n represent n surface treatment methods, a, B, C N means there are n kinds of processing aids for composite blending. Of course, the establishment of the mathematical model also requires the corresponding digital method sampling. Here we grasp one or two main factors and use the optimization method (multi factor) proposed by the famous mathematician Mr. Hua Luogeng to extend the long-term popular golden section method at home and abroad to the two factor treatment, with a value of 0.618. Because its value is difficult to remember and calculate, it is difficult to correctly use it in the actual trial production in people with low educational level. In the long-term trial production, we appropriately adopted the half method, which is convenient for memory and actual calculation, with a low error rate, and its trial production times are only increased by about 3-5% compared with the golden section method, so it is a method with more speed, better economy and less errors. Of course, there are still many problems and difficulties waiting for us to overcome in the process of compiling relevant computer software. Here, we warmly welcome all colleagues in the same industry to call and write to participate in and exchange and learn from each other, so as to better integrate the theory of multi-component composite blending with the digital actual development and production, guide the industrial development and production, and achieve less development time, reasonable production formula, complete and effective production process, low production cost, improved and stable product quality, which is a great good thing of epoch-making significance

IV. practice of multi-component composite blending modification theory:

the multi-component composite blending modification theory has opened the thinking horizon of scientific researchers. It can complete the trial production in a small amount of time in the past, which can not only save the trial production cost, but also digitize the plastic trial production and production, and realize computer management. So as to improve labor productivity, reduce costs, ensure product quality and improve the gold content of product technology. "The imbalance between supply and demand for high tear resistance flame retardant cast polypropylene film has shifted from the past state of oversupply to the current state of supply shortage" developed and produced under the guidance of multivariate composite modification theory has achieved great success. It is described in detail on page 224 of the paper collection of the annual meeting of the modified plastics professional committee of China Plastics Processing Industry Association, no longer repeated in this paper. Taking the development and production of "transparent film filling modifier" as an example, this paper introduces the practice of multi-component composite blending modification theory: in 2004, the price of plastic raw materials increased significantly, but the product price could not increase or only increased slightly for various reasons. The majority of plastic products factories urgently hope to have methods, processes and materials that will not affect the product quality but also reduce the cost, In particular, agricultural film manufacturers used in agricultural production for a long time. In order to reduce the burden of farmers, we have developed "transparent film filling masterbatch". Its characteristics are: after adding 30% of the masterbatch to LDPE, the light transmittance of 12 wire thick film changes from 92.2% of pure resin to 91.5%, only decreasing by 0.7%, and the transparency is good

at present, transparent plastic film is mainly used in greenhouses for agricultural production. If there are software problems, you can consult our technicians about packaging bags, etc. the technology is mature and the effect is good. With the rise of international oil prices, the price of plastic raw materials rose explosively in 2004, and the price of agricultural film also rose, increasing the cost of farmers' production. Adding fillers in film production can reduce the cost, but its transparency is damaged. For many years, many plastic experts have been unable to overcome the great problem of light transmittance decline. The emergence of multi-component composite blending modification theory has liberated the thinking of engineers and technicians. After two months of hard work, the transparent film masterbatch produced has achieved excellent results after user testing

test equipment: (1) high speed mixer

(2) 72 type twin screw extrusion line

(3) low pressure film blow molding line

performance: see the following report, which was tested by Mr. Fang Wei of grand (Lanzhou) Chemical Technology Co., Ltd. on November 15, 2004

application example: the blown film workshop of Shanghai Linda Plastic Co., Ltd. is added to HDPE transparent vest bags at the proportion of 30%. Its performance indicators meet the use requirements, the processing technology remains unchanged, the cost is reduced, and the effect is satisfactory

v. discussion

(1) the theory of multi-component composite blending modification is the product of the development from plastic blending modification to the latest stringent requirements of modern science and technology that plastic 4.1 lime should meet the relevant provisions in jc/t 621 for new materials. Its biggest feature is that while improving the performance of a certain part of the plastic, other properties do not decline, or even rise at the same time, which saves time, labor and cost during development. Its core technology is that one treatment measure cannot be used to treat the surface of the powder, and two or three kinds of treatment measures must be carried out according to the actual needs, so as to produce the desired effect

(2) various measures for modification may have synergistic effects, or they may be irrelevant or even conflicting, resulting in a large proportion of unknown effects, which need to be solved by long-term practical experience or field tests. Therefore, according to experience, after multi-component composite blending treatment, the optimization method is adopted to achieve high effect, low cost and short time

(3) the greatest contribution of the multi-component composite blending modification theory to plastic modification is to introduce the latest modern computer technology into the test and production of simulated modified plastics. Although it is still in the primary stage, it makes the digital feasibility of plastic modification technology a big step forward after all

welcome colleagues interested in computer simulation plastic modification technology to call and write to promote the promotion, application and development of this technology

(4) the multi-component composite blending modification theory integrates the latest research results of contemporary plastic modification essence, so its modification technology content is high. Generally speaking, it is no exaggeration to say that what properties you need plastic resin, it can give you what properties, and the property price ratio is the highest

source: Shanghai Institute of plastic products Author: Chen Xinxun