Preparation method of integrally formed road barrier
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A technology for isolation fences and roads, which is applied to household components, applications, household appliances, etc., can solve problems that have not been discovered, and achieve the effects of improving the probability of secondary damage, excellent water resistance, and driving safety
Active Publication Date: 2018-01-23
南京露泰交通设施有限公司
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Problems solved by technology
At present, our company has not found any relevant reports on compounding starch esters with chitosan esters and hyaluronic acid esters to form thermoplastic materials
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preparation example Construction
[0032] (1) The preparation steps of starch ester are as follows:
[0033]Step 1: Add methanol into the reactor as a reaction medium, add molecular sieves, and then slowly add starch, so that the starch is evenly dispersed in methanol, and maintain the temperature in the reactor at 50°C;
[0034] Step 2: add methyl ricinoleate into the above reaction kettle so that m (starch): m (methyl ricinoleate) = 1:1.2, and react at 50°C for 6 hours;
[0035] Step 3: After the reaction is completed, the reactant is precipitated with 95% ethanol and centrifuged to obtain a starch ester with a degree of substitution of 0.5-0.7 and an average molecular weight of 50,000-60,000KD.
[0036] (2) The preparation steps of chitosan ester are as follows:
[0037] Step 1: Add formamide into the reaction kettle as the reaction medium, add molecular sieves, and then add chitosan, so that chitosan is evenly dispersed in the formamide, and maintain the temperature in the reaction kettle at 60°C;
[0038...
Embodiment 1
[0046] Add the starch ester, chitosan ester, and hyaluronic acid ester prepared above into the high-speed mixer according to the weight ratio of 1:1:1, heat the materials in the high-speed mixer to 110°C, and rotate at 400 rpm Run and mix for 30 minutes; adjust the temperature of the mixed material in the mixer to 140°C, adjust the speed to 750 rpm, mix for 30 minutes, stop mixing, take out the mixed material, and cool it; send the cooled mixed material into the kneader , start the operation and heat the mixture to 90°C, knead the mixture for 30 minutes, take out the material after kneading, send it into the twin-screw extruder, melt and granulate at 140°C, and then make a biodegradable thermoplastic material.
Embodiment 2
[0048] The ratio of starch ester: chitosan ester: hyaluronic acid ester is 2:2:1; the mixing temperature is 150°C; the rest are the same as in Example 1.
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Abstract
The invention discloses a production method for an integrally-formed road isolating fence. The production method comprises the following steps: preparing melt materials, fusing, and carrying out extrusion blow molding and pressure maintaining, cooling and trimming, thus obtaining the integrally-formed road isolating fence. The integrally-formed road isolating fence disclosed by the invention is produced by taking a brand-new degradable thermoplastic material as a raw material; the material has excellent toughness, water resistance and stability; fuzziness and collapse of the thermoplastic material are effectively reduced; in addition, the material can be completely biodegraded and is a novel environment-friendly material. The integrally-formed road isolating fence produced by adopting the material can meet corresponding standards of traffic industry and has the advantages of excellent impact resisting capability, good toughness, additive synergistic effect, durability and low possibility of ageing and breaking; the probability that an existing isolating fence encounters secondary damage can be remarkably improved, higher safety in driving is realized, and life safety of drivers and passengers is guaranteed more comprehensively.
Description
technical field [0001] The invention belongs to the technical field of traffic equipment, and in particular relates to a preparation method of an integrally formed road barrier. Background technique [0002] At present, barriers are often used on municipal roads to separate the driving directions between motor vehicle lanes and play the role of central isolation; or in densely populated areas such as schools and stations, in order to ensure the safety of pedestrians and the smooth running of vehicles, set up Separation fences between motor vehicle lanes and non-motor vehicle lanes; or enclosing green belts, etc. Existing isolation fences are mostly made of plastic steel materials, with many parts, connected by electric welding or nuts, and the installation is complicated and time-consuming. According to existing reports, they are easy to loose during use and cause potential safety hazards; The metal guardrail on the highway used to protect driving safety has become a deadly...
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