PP non-woven fabrics in the field of agriculture agricultural harvest cloth, prevent frost protection, such as green in the field of urban green space, highway, railway side slope protection, afforestation, etc., and a sun hat, umbrella, outdoor billboards, tents, outdoor backpack, outdoor sports wear, car outdoor dust cover and so on are widely used in outdoor products. However, due to the structure characteristic of this kind of PP, the in the process of processing and use are vulnerable to heat, oxygen, light, environmental factors such as climate and the influence of the aging degradation, lead to shorten product life, cause the waste of resources. Especially in the outdoor application of PP non-woven products, because of its thin material itself, under the influence of various aging factors, the aging rate is faster. Therefore, it is of great economic and social significance to improve the weatherability and durability of non-woven PP non-woven fabrics.

At present, the main method to improve the weather resistance of PP is to add anti-aging auxiliaries. Although there are a lot of suitable for PP material in the market now anti-aging agent varieties, but directly adding anti-aging agent production methods often makes additives dispersed in the product is uneven, resulting in a reduction in anti-aging efficacy of non-woven industry, in particular, the method is easy to cause broken wires in non-woven fabric production process, affect the normal production and reduce the production efficiency. In anti-aging of PP non-woven fabric, mainly to join the weather resistance when in the production of masterbatch, currently on the market for non-woven fabric of weather resistance of modified additives system and most of the products supplied by foreign companies, some domestic enterprises producing this kind of weather resistance masterbatch, but the amount is larger, because this product's price is higher, increase the cost of the enterprise, compressing the relevant corporate profits, domestic manufacturer of anti-aging non-woven fabrics mainly export-oriented, undoubtedly hindered the rapid development of weather resistance non-woven industry in our country.

We according to the requirements of the PP non-woven fabric production technology and outdoor use to choose the appropriate anti-aging agent, through the diversity of anti-aging agent system formula design, developed a excellent process stability, outstanding long-term heat stability of oxygen, high efficiency light stability and weather resistance of PP non-woven special weather resistance masterbatch LS - 133 - w, make PP non-woven fabric can effectively resist due to heat in the process of production and outdoor use, oxygen, light, environment and climate factors such as aging degradation problems, significantly extend the service life of outdoor products. This paper makes a comparative study of its application in PP non-woven fabric with foreign similar imported ones.

1. Basic performance of ls-133w of PP non-woven fabric

Table 1 is the property parameter data table for the resistance of ls-133w. The use matrix resin and other non-woven with PP resin has excellent compatibility, and the molten refers to 37 g / 10 min (230 ℃, 2.16 kg), and other non-woven with PP resin with matching melt fluidity, easy to implement with the matrix resin blend and anti-aging additives ingredients evenly dispersed; At the same time the products of thermal decomposition temperature is above 320 ℃, fully satisfy the requirement of the PP spinning high temperature. After PP non-woven manufacturers use feedback results show that the product has excellent process stability, effectively avoid the phenomenon of broken wires in production process, ensure the PP spinning can continuous production, improve the production efficiency.

Table 1 physical parameters of ls-133w

2. Mechanical properties of PP nonwoven fabric before and after aging

Table 2 shows the mechanical properties of 1 # and 2 # PP nonwovens and 0 # PP nonwoven and unadded anti-aging parent grains of anti-aging parent grains respectively added in the s-133w and imported anti-aging mother granule respectively.

According to the data in the table, the fracture strength retention rate and elongation rate of the nonwoven samples of 0 #, 1 # and 2 # PP are decreased with the increase of aging time. After the aging time of xenon lamp of 240h, the longitudinal fracture strength retention rate of PP nonwoven fabric without anti-aging parent grains was 5.6%; The elongation rate of fracture elongation is 1.9%, and the performance is obviously decreased, which can not meet the requirement of outdoor use. In addition, the fracture strength retention rate and elongation rate of the anti-aging parent grain of 1 and 2 # non-woven fabrics have been significantly improved. After the aging of 240h xenon lamp, the fracture strength retention rate of 1 # and 2 # non-woven fabrics was 84.4% and 83.1% respectively, and the elongation rate of fracture elongation was 62.7% and 62.1% respectively.

This is because the PP by light, the light oxygen aging reaction in molecular chain rupture is given priority to, to produce a large number of free radicals in the process of further accelerated the aging degradation of PP, and anti-aging masterbatch containing oxygen stabilization effect of light on PP non-woven stabilizing additives composition, the active ingredients can not only absorb and shielding ultraviolet part, also can also capture PP macromolecular chain of free radicals, break effectively delay further aging degradation of PP.

At the same time, the table 2 shows that after the same time of xenon lamp aging, each performance are higher than 2 # 1 # non-woven non-woven fabric, which suggests that the LS - 133 - w weather resistance masterbatch the anti-aging properties of the PP non-woven fabric is better than imported anti-aging masterbatch.

Table 2. Longitudinal mechanical properties of PP nonwoven fabric before and after aging

3 PP grey standard before and after aging

The color change is the most intuitive reflect material aging, change color rating evaluation of its color is an important means of the change, grey scale rating is under the standard illuminant D65 assess, level 5 is best, grade 1 is the worst. Table 3 is not adding anti-aging masterbatch of 0 # non-woven, respectively added LS - 133 - w anti-aging masterbatch and import anti-aging masterbatch of 1 # and 2 # PP non-woven fabrics in different time after color xenon lamp aging ratings.

It can be seen from the table that, after the aging time of xenon lamp of 240h, the grey scale of the PP nonwoven fabric without anti-aging mother grains was level 2; The 1 # non-woven fabric of the ls-133w and the 2 # non-woven grey scale of the imported anti-aging parent grains are respectively 4-5 and 4 respectively. This shows that the addition of anti-aging mother grain has obvious effect on the color of PP non-woven fabric, and the effect of ls-133w is better.

Table 4. Discoloration rating of PP nonwoven material before and after aging

4 conclusion

(1) the failure rate and elongation rate of PP nonwovens were significantly reduced after the non-woven PP nonwovens were aged by xenon, far from meeting the requirements of outdoor practical application.

(2) the weather resistance masterbatch LS - 133 - w and import anti-aging masterbatch added were effectively improved the tensile strength of PP non-woven retention and retention rate of elongation, at the same time to keep the colour and lustre of PP non-woven fabric has the remarkable effect;

(3) with the same amount of added amount (2.5wt %), the anti-aging performance of the ms-133w is significantly better than that of the foreign anti-aging mother grain, and the cost performance is more competitive.